mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 18:41:23 +00:00
41e0e24b45
Pull kbuild updates from Michal Marek: - prototypes for x86 asm-exported symbols (Adam Borowski) and a warning about missing CRCs (Nick Piggin) - asm-exports fix for LTO (Nicolas Pitre) - thin archives improvements (Nick Piggin) - linker script fix for CONFIG_LD_DEAD_CODE_DATA_ELIMINATION (Nick Piggin) - genksyms support for __builtin_va_list keyword - misc minor fixes * 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: x86/kbuild: enable modversions for symbols exported from asm kbuild: fix scripts/adjust_autoksyms.sh* for the no modules case scripts/kallsyms: remove last remnants of --page-offset option make use of make variable CURDIR instead of calling pwd kbuild: cmd_export_list: tighten the sed script kbuild: minor improvement for thin archives build kbuild: modpost warn if export version crc is missing kbuild: keep data tables through dead code elimination kbuild: improve linker compatibility with lib-ksyms.o build genksyms: Regenerate parser kbuild/genksyms: handle va_list type kbuild: thin archives for multi-y targets kbuild: kallsyms allow 3-pass generation if symbols size has changed
2510 lines
66 KiB
C
2510 lines
66 KiB
C
/* Postprocess module symbol versions
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*
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* Copyright 2003 Kai Germaschewski
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* Copyright 2002-2004 Rusty Russell, IBM Corporation
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* Copyright 2006-2008 Sam Ravnborg
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* Based in part on module-init-tools/depmod.c,file2alias
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*
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* This software may be used and distributed according to the terms
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* of the GNU General Public License, incorporated herein by reference.
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*
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* Usage: modpost vmlinux module1.o module2.o ...
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*/
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <errno.h>
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#include "modpost.h"
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#include "../../include/generated/autoconf.h"
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#include "../../include/linux/license.h"
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#include "../../include/linux/export.h"
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/* Are we using CONFIG_MODVERSIONS? */
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static int modversions = 0;
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/* Warn about undefined symbols? (do so if we have vmlinux) */
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static int have_vmlinux = 0;
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/* Is CONFIG_MODULE_SRCVERSION_ALL set? */
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static int all_versions = 0;
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/* If we are modposting external module set to 1 */
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static int external_module = 0;
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/* Warn about section mismatch in vmlinux if set to 1 */
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static int vmlinux_section_warnings = 1;
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/* Only warn about unresolved symbols */
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static int warn_unresolved = 0;
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/* How a symbol is exported */
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static int sec_mismatch_count = 0;
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static int sec_mismatch_verbose = 1;
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static int sec_mismatch_fatal = 0;
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/* ignore missing files */
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static int ignore_missing_files;
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enum export {
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export_plain, export_unused, export_gpl,
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export_unused_gpl, export_gpl_future, export_unknown
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};
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#define PRINTF __attribute__ ((format (printf, 1, 2)))
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PRINTF void fatal(const char *fmt, ...)
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{
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va_list arglist;
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fprintf(stderr, "FATAL: ");
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va_start(arglist, fmt);
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vfprintf(stderr, fmt, arglist);
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va_end(arglist);
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exit(1);
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}
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PRINTF void warn(const char *fmt, ...)
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{
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va_list arglist;
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fprintf(stderr, "WARNING: ");
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va_start(arglist, fmt);
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vfprintf(stderr, fmt, arglist);
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va_end(arglist);
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}
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PRINTF void merror(const char *fmt, ...)
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{
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va_list arglist;
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fprintf(stderr, "ERROR: ");
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va_start(arglist, fmt);
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vfprintf(stderr, fmt, arglist);
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va_end(arglist);
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}
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static inline bool strends(const char *str, const char *postfix)
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{
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if (strlen(str) < strlen(postfix))
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return false;
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return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
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}
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static int is_vmlinux(const char *modname)
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{
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const char *myname;
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myname = strrchr(modname, '/');
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if (myname)
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myname++;
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else
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myname = modname;
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return (strcmp(myname, "vmlinux") == 0) ||
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(strcmp(myname, "vmlinux.o") == 0);
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}
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void *do_nofail(void *ptr, const char *expr)
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{
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if (!ptr)
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fatal("modpost: Memory allocation failure: %s.\n", expr);
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return ptr;
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}
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/* A list of all modules we processed */
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static struct module *modules;
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static struct module *find_module(char *modname)
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{
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struct module *mod;
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for (mod = modules; mod; mod = mod->next)
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if (strcmp(mod->name, modname) == 0)
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break;
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return mod;
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}
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static struct module *new_module(const char *modname)
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{
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struct module *mod;
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char *p;
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mod = NOFAIL(malloc(sizeof(*mod)));
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memset(mod, 0, sizeof(*mod));
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p = NOFAIL(strdup(modname));
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/* strip trailing .o */
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if (strends(p, ".o")) {
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p[strlen(p) - 2] = '\0';
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mod->is_dot_o = 1;
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}
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/* add to list */
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mod->name = p;
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mod->gpl_compatible = -1;
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mod->next = modules;
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modules = mod;
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return mod;
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}
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/* A hash of all exported symbols,
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* struct symbol is also used for lists of unresolved symbols */
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#define SYMBOL_HASH_SIZE 1024
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struct symbol {
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struct symbol *next;
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struct module *module;
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unsigned int crc;
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int crc_valid;
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unsigned int weak:1;
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unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
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unsigned int kernel:1; /* 1 if symbol is from kernel
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* (only for external modules) **/
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unsigned int preloaded:1; /* 1 if symbol from Module.symvers, or crc */
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enum export export; /* Type of export */
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char name[0];
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};
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static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
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/* This is based on the hash agorithm from gdbm, via tdb */
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static inline unsigned int tdb_hash(const char *name)
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{
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unsigned value; /* Used to compute the hash value. */
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unsigned i; /* Used to cycle through random values. */
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/* Set the initial value from the key size. */
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for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
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value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
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return (1103515243 * value + 12345);
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}
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/**
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* Allocate a new symbols for use in the hash of exported symbols or
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* the list of unresolved symbols per module
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**/
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static struct symbol *alloc_symbol(const char *name, unsigned int weak,
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struct symbol *next)
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{
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struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
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memset(s, 0, sizeof(*s));
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strcpy(s->name, name);
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s->weak = weak;
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s->next = next;
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return s;
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}
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/* For the hash of exported symbols */
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static struct symbol *new_symbol(const char *name, struct module *module,
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enum export export)
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{
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unsigned int hash;
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struct symbol *new;
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hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
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new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
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new->module = module;
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new->export = export;
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return new;
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}
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static struct symbol *find_symbol(const char *name)
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{
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struct symbol *s;
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/* For our purposes, .foo matches foo. PPC64 needs this. */
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if (name[0] == '.')
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name++;
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for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
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if (strcmp(s->name, name) == 0)
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return s;
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}
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return NULL;
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}
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static const struct {
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const char *str;
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enum export export;
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} export_list[] = {
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{ .str = "EXPORT_SYMBOL", .export = export_plain },
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{ .str = "EXPORT_UNUSED_SYMBOL", .export = export_unused },
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{ .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
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{ .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
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{ .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
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{ .str = "(unknown)", .export = export_unknown },
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};
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static const char *export_str(enum export ex)
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{
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return export_list[ex].str;
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}
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static enum export export_no(const char *s)
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{
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int i;
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if (!s)
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return export_unknown;
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for (i = 0; export_list[i].export != export_unknown; i++) {
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if (strcmp(export_list[i].str, s) == 0)
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return export_list[i].export;
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}
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return export_unknown;
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}
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static const char *sec_name(struct elf_info *elf, int secindex);
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#define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
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static enum export export_from_secname(struct elf_info *elf, unsigned int sec)
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{
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const char *secname = sec_name(elf, sec);
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if (strstarts(secname, "___ksymtab+"))
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return export_plain;
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else if (strstarts(secname, "___ksymtab_unused+"))
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return export_unused;
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else if (strstarts(secname, "___ksymtab_gpl+"))
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return export_gpl;
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else if (strstarts(secname, "___ksymtab_unused_gpl+"))
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return export_unused_gpl;
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else if (strstarts(secname, "___ksymtab_gpl_future+"))
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return export_gpl_future;
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else
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return export_unknown;
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}
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static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
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{
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if (sec == elf->export_sec)
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return export_plain;
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else if (sec == elf->export_unused_sec)
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return export_unused;
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else if (sec == elf->export_gpl_sec)
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return export_gpl;
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else if (sec == elf->export_unused_gpl_sec)
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return export_unused_gpl;
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else if (sec == elf->export_gpl_future_sec)
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return export_gpl_future;
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else
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return export_unknown;
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}
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/**
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* Add an exported symbol - it may have already been added without a
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* CRC, in this case just update the CRC
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**/
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static struct symbol *sym_add_exported(const char *name, struct module *mod,
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enum export export)
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{
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struct symbol *s = find_symbol(name);
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if (!s) {
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s = new_symbol(name, mod, export);
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} else {
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if (!s->preloaded) {
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warn("%s: '%s' exported twice. Previous export "
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"was in %s%s\n", mod->name, name,
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s->module->name,
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is_vmlinux(s->module->name) ?"":".ko");
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} else {
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/* In case Module.symvers was out of date */
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s->module = mod;
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}
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}
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s->preloaded = 0;
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s->vmlinux = is_vmlinux(mod->name);
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s->kernel = 0;
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s->export = export;
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return s;
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}
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static void sym_update_crc(const char *name, struct module *mod,
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unsigned int crc, enum export export)
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{
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struct symbol *s = find_symbol(name);
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if (!s) {
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s = new_symbol(name, mod, export);
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/* Don't complain when we find it later. */
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s->preloaded = 1;
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}
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s->crc = crc;
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s->crc_valid = 1;
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}
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void *grab_file(const char *filename, unsigned long *size)
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{
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struct stat st;
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void *map = MAP_FAILED;
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int fd;
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fd = open(filename, O_RDONLY);
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if (fd < 0)
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return NULL;
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if (fstat(fd, &st))
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goto failed;
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*size = st.st_size;
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map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
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failed:
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close(fd);
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if (map == MAP_FAILED)
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return NULL;
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return map;
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}
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/**
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* Return a copy of the next line in a mmap'ed file.
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* spaces in the beginning of the line is trimmed away.
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* Return a pointer to a static buffer.
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**/
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char *get_next_line(unsigned long *pos, void *file, unsigned long size)
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{
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static char line[4096];
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int skip = 1;
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size_t len = 0;
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signed char *p = (signed char *)file + *pos;
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char *s = line;
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for (; *pos < size ; (*pos)++) {
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if (skip && isspace(*p)) {
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p++;
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continue;
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}
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skip = 0;
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if (*p != '\n' && (*pos < size)) {
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len++;
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*s++ = *p++;
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if (len > 4095)
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break; /* Too long, stop */
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} else {
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/* End of string */
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*s = '\0';
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return line;
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}
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}
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/* End of buffer */
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return NULL;
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}
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void release_file(void *file, unsigned long size)
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{
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munmap(file, size);
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}
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static int parse_elf(struct elf_info *info, const char *filename)
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{
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unsigned int i;
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Elf_Ehdr *hdr;
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Elf_Shdr *sechdrs;
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Elf_Sym *sym;
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const char *secstrings;
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unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;
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hdr = grab_file(filename, &info->size);
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if (!hdr) {
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if (ignore_missing_files) {
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fprintf(stderr, "%s: %s (ignored)\n", filename,
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strerror(errno));
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return 0;
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}
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perror(filename);
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exit(1);
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}
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info->hdr = hdr;
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if (info->size < sizeof(*hdr)) {
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/* file too small, assume this is an empty .o file */
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return 0;
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}
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/* Is this a valid ELF file? */
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if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
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(hdr->e_ident[EI_MAG1] != ELFMAG1) ||
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(hdr->e_ident[EI_MAG2] != ELFMAG2) ||
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(hdr->e_ident[EI_MAG3] != ELFMAG3)) {
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/* Not an ELF file - silently ignore it */
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return 0;
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}
|
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/* Fix endianness in ELF header */
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hdr->e_type = TO_NATIVE(hdr->e_type);
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hdr->e_machine = TO_NATIVE(hdr->e_machine);
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hdr->e_version = TO_NATIVE(hdr->e_version);
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hdr->e_entry = TO_NATIVE(hdr->e_entry);
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hdr->e_phoff = TO_NATIVE(hdr->e_phoff);
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hdr->e_shoff = TO_NATIVE(hdr->e_shoff);
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hdr->e_flags = TO_NATIVE(hdr->e_flags);
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|
hdr->e_ehsize = TO_NATIVE(hdr->e_ehsize);
|
|
hdr->e_phentsize = TO_NATIVE(hdr->e_phentsize);
|
|
hdr->e_phnum = TO_NATIVE(hdr->e_phnum);
|
|
hdr->e_shentsize = TO_NATIVE(hdr->e_shentsize);
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hdr->e_shnum = TO_NATIVE(hdr->e_shnum);
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hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
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sechdrs = (void *)hdr + hdr->e_shoff;
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info->sechdrs = sechdrs;
|
|
|
|
/* Check if file offset is correct */
|
|
if (hdr->e_shoff > info->size) {
|
|
fatal("section header offset=%lu in file '%s' is bigger than "
|
|
"filesize=%lu\n", (unsigned long)hdr->e_shoff,
|
|
filename, info->size);
|
|
return 0;
|
|
}
|
|
|
|
if (hdr->e_shnum == SHN_UNDEF) {
|
|
/*
|
|
* There are more than 64k sections,
|
|
* read count from .sh_size.
|
|
*/
|
|
info->num_sections = TO_NATIVE(sechdrs[0].sh_size);
|
|
}
|
|
else {
|
|
info->num_sections = hdr->e_shnum;
|
|
}
|
|
if (hdr->e_shstrndx == SHN_XINDEX) {
|
|
info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link);
|
|
}
|
|
else {
|
|
info->secindex_strings = hdr->e_shstrndx;
|
|
}
|
|
|
|
/* Fix endianness in section headers */
|
|
for (i = 0; i < info->num_sections; i++) {
|
|
sechdrs[i].sh_name = TO_NATIVE(sechdrs[i].sh_name);
|
|
sechdrs[i].sh_type = TO_NATIVE(sechdrs[i].sh_type);
|
|
sechdrs[i].sh_flags = TO_NATIVE(sechdrs[i].sh_flags);
|
|
sechdrs[i].sh_addr = TO_NATIVE(sechdrs[i].sh_addr);
|
|
sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
|
|
sechdrs[i].sh_size = TO_NATIVE(sechdrs[i].sh_size);
|
|
sechdrs[i].sh_link = TO_NATIVE(sechdrs[i].sh_link);
|
|
sechdrs[i].sh_info = TO_NATIVE(sechdrs[i].sh_info);
|
|
sechdrs[i].sh_addralign = TO_NATIVE(sechdrs[i].sh_addralign);
|
|
sechdrs[i].sh_entsize = TO_NATIVE(sechdrs[i].sh_entsize);
|
|
}
|
|
/* Find symbol table. */
|
|
secstrings = (void *)hdr + sechdrs[info->secindex_strings].sh_offset;
|
|
for (i = 1; i < info->num_sections; i++) {
|
|
const char *secname;
|
|
int nobits = sechdrs[i].sh_type == SHT_NOBITS;
|
|
|
|
if (!nobits && sechdrs[i].sh_offset > info->size) {
|
|
fatal("%s is truncated. sechdrs[i].sh_offset=%lu > "
|
|
"sizeof(*hrd)=%zu\n", filename,
|
|
(unsigned long)sechdrs[i].sh_offset,
|
|
sizeof(*hdr));
|
|
return 0;
|
|
}
|
|
secname = secstrings + sechdrs[i].sh_name;
|
|
if (strcmp(secname, ".modinfo") == 0) {
|
|
if (nobits)
|
|
fatal("%s has NOBITS .modinfo\n", filename);
|
|
info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
|
|
info->modinfo_len = sechdrs[i].sh_size;
|
|
} else if (strcmp(secname, "__ksymtab") == 0)
|
|
info->export_sec = i;
|
|
else if (strcmp(secname, "__ksymtab_unused") == 0)
|
|
info->export_unused_sec = i;
|
|
else if (strcmp(secname, "__ksymtab_gpl") == 0)
|
|
info->export_gpl_sec = i;
|
|
else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
|
|
info->export_unused_gpl_sec = i;
|
|
else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
|
|
info->export_gpl_future_sec = i;
|
|
|
|
if (sechdrs[i].sh_type == SHT_SYMTAB) {
|
|
unsigned int sh_link_idx;
|
|
symtab_idx = i;
|
|
info->symtab_start = (void *)hdr +
|
|
sechdrs[i].sh_offset;
|
|
info->symtab_stop = (void *)hdr +
|
|
sechdrs[i].sh_offset + sechdrs[i].sh_size;
|
|
sh_link_idx = sechdrs[i].sh_link;
|
|
info->strtab = (void *)hdr +
|
|
sechdrs[sh_link_idx].sh_offset;
|
|
}
|
|
|
|
/* 32bit section no. table? ("more than 64k sections") */
|
|
if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
|
|
symtab_shndx_idx = i;
|
|
info->symtab_shndx_start = (void *)hdr +
|
|
sechdrs[i].sh_offset;
|
|
info->symtab_shndx_stop = (void *)hdr +
|
|
sechdrs[i].sh_offset + sechdrs[i].sh_size;
|
|
}
|
|
}
|
|
if (!info->symtab_start)
|
|
fatal("%s has no symtab?\n", filename);
|
|
|
|
/* Fix endianness in symbols */
|
|
for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
|
|
sym->st_shndx = TO_NATIVE(sym->st_shndx);
|
|
sym->st_name = TO_NATIVE(sym->st_name);
|
|
sym->st_value = TO_NATIVE(sym->st_value);
|
|
sym->st_size = TO_NATIVE(sym->st_size);
|
|
}
|
|
|
|
if (symtab_shndx_idx != ~0U) {
|
|
Elf32_Word *p;
|
|
if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link)
|
|
fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
|
|
filename, sechdrs[symtab_shndx_idx].sh_link,
|
|
symtab_idx);
|
|
/* Fix endianness */
|
|
for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
|
|
p++)
|
|
*p = TO_NATIVE(*p);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void parse_elf_finish(struct elf_info *info)
|
|
{
|
|
release_file(info->hdr, info->size);
|
|
}
|
|
|
|
static int ignore_undef_symbol(struct elf_info *info, const char *symname)
|
|
{
|
|
/* ignore __this_module, it will be resolved shortly */
|
|
if (strcmp(symname, VMLINUX_SYMBOL_STR(__this_module)) == 0)
|
|
return 1;
|
|
/* ignore global offset table */
|
|
if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
|
|
return 1;
|
|
if (info->hdr->e_machine == EM_PPC)
|
|
/* Special register function linked on all modules during final link of .ko */
|
|
if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 ||
|
|
strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 ||
|
|
strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 ||
|
|
strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0 ||
|
|
strncmp(symname, "_restvr_", sizeof("_restvr_") - 1) == 0 ||
|
|
strncmp(symname, "_savevr_", sizeof("_savevr_") - 1) == 0)
|
|
return 1;
|
|
if (info->hdr->e_machine == EM_PPC64)
|
|
/* Special register function linked on all modules during final link of .ko */
|
|
if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 ||
|
|
strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0 ||
|
|
strncmp(symname, "_restvr_", sizeof("_restvr_") - 1) == 0 ||
|
|
strncmp(symname, "_savevr_", sizeof("_savevr_") - 1) == 0 ||
|
|
strcmp(symname, ".TOC.") == 0)
|
|
return 1;
|
|
/* Do not ignore this symbol */
|
|
return 0;
|
|
}
|
|
|
|
#define CRC_PFX VMLINUX_SYMBOL_STR(__crc_)
|
|
#define KSYMTAB_PFX VMLINUX_SYMBOL_STR(__ksymtab_)
|
|
|
|
static void handle_modversions(struct module *mod, struct elf_info *info,
|
|
Elf_Sym *sym, const char *symname)
|
|
{
|
|
unsigned int crc;
|
|
enum export export;
|
|
bool is_crc = false;
|
|
|
|
if ((!is_vmlinux(mod->name) || mod->is_dot_o) &&
|
|
strncmp(symname, "__ksymtab", 9) == 0)
|
|
export = export_from_secname(info, get_secindex(info, sym));
|
|
else
|
|
export = export_from_sec(info, get_secindex(info, sym));
|
|
|
|
/* CRC'd symbol */
|
|
if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
|
|
is_crc = true;
|
|
crc = (unsigned int) sym->st_value;
|
|
sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
|
|
export);
|
|
}
|
|
|
|
switch (sym->st_shndx) {
|
|
case SHN_COMMON:
|
|
if (!strncmp(symname, "__gnu_lto_", sizeof("__gnu_lto_")-1)) {
|
|
/* Should warn here, but modpost runs before the linker */
|
|
} else
|
|
warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
|
|
break;
|
|
case SHN_UNDEF:
|
|
/* undefined symbol */
|
|
if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
|
|
ELF_ST_BIND(sym->st_info) != STB_WEAK)
|
|
break;
|
|
if (ignore_undef_symbol(info, symname))
|
|
break;
|
|
/* cope with newer glibc (2.3.4 or higher) STT_ definition in elf.h */
|
|
#if defined(STT_REGISTER) || defined(STT_SPARC_REGISTER)
|
|
/* add compatibility with older glibc */
|
|
#ifndef STT_SPARC_REGISTER
|
|
#define STT_SPARC_REGISTER STT_REGISTER
|
|
#endif
|
|
if (info->hdr->e_machine == EM_SPARC ||
|
|
info->hdr->e_machine == EM_SPARCV9) {
|
|
/* Ignore register directives. */
|
|
if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
|
|
break;
|
|
if (symname[0] == '.') {
|
|
char *munged = strdup(symname);
|
|
munged[0] = '_';
|
|
munged[1] = toupper(munged[1]);
|
|
symname = munged;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
|
|
if (symname[0] != '_')
|
|
break;
|
|
else
|
|
symname++;
|
|
#endif
|
|
if (is_crc) {
|
|
const char *e = is_vmlinux(mod->name) ?"":".ko";
|
|
warn("EXPORT symbol \"%s\" [%s%s] version generation failed, symbol will not be versioned.\n", symname + strlen(CRC_PFX), mod->name, e);
|
|
}
|
|
mod->unres = alloc_symbol(symname,
|
|
ELF_ST_BIND(sym->st_info) == STB_WEAK,
|
|
mod->unres);
|
|
break;
|
|
default:
|
|
/* All exported symbols */
|
|
if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
|
|
sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
|
|
export);
|
|
}
|
|
if (strcmp(symname, VMLINUX_SYMBOL_STR(init_module)) == 0)
|
|
mod->has_init = 1;
|
|
if (strcmp(symname, VMLINUX_SYMBOL_STR(cleanup_module)) == 0)
|
|
mod->has_cleanup = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Parse tag=value strings from .modinfo section
|
|
**/
|
|
static char *next_string(char *string, unsigned long *secsize)
|
|
{
|
|
/* Skip non-zero chars */
|
|
while (string[0]) {
|
|
string++;
|
|
if ((*secsize)-- <= 1)
|
|
return NULL;
|
|
}
|
|
|
|
/* Skip any zero padding. */
|
|
while (!string[0]) {
|
|
string++;
|
|
if ((*secsize)-- <= 1)
|
|
return NULL;
|
|
}
|
|
return string;
|
|
}
|
|
|
|
static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
|
|
const char *tag, char *info)
|
|
{
|
|
char *p;
|
|
unsigned int taglen = strlen(tag);
|
|
unsigned long size = modinfo_len;
|
|
|
|
if (info) {
|
|
size -= info - (char *)modinfo;
|
|
modinfo = next_string(info, &size);
|
|
}
|
|
|
|
for (p = modinfo; p; p = next_string(p, &size)) {
|
|
if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
|
|
return p + taglen + 1;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
|
|
const char *tag)
|
|
|
|
{
|
|
return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
|
|
}
|
|
|
|
/**
|
|
* Test if string s ends in string sub
|
|
* return 0 if match
|
|
**/
|
|
static int strrcmp(const char *s, const char *sub)
|
|
{
|
|
int slen, sublen;
|
|
|
|
if (!s || !sub)
|
|
return 1;
|
|
|
|
slen = strlen(s);
|
|
sublen = strlen(sub);
|
|
|
|
if ((slen == 0) || (sublen == 0))
|
|
return 1;
|
|
|
|
if (sublen > slen)
|
|
return 1;
|
|
|
|
return memcmp(s + slen - sublen, sub, sublen);
|
|
}
|
|
|
|
static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
|
|
{
|
|
if (sym)
|
|
return elf->strtab + sym->st_name;
|
|
else
|
|
return "(unknown)";
|
|
}
|
|
|
|
static const char *sec_name(struct elf_info *elf, int secindex)
|
|
{
|
|
Elf_Shdr *sechdrs = elf->sechdrs;
|
|
return (void *)elf->hdr +
|
|
elf->sechdrs[elf->secindex_strings].sh_offset +
|
|
sechdrs[secindex].sh_name;
|
|
}
|
|
|
|
static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
|
|
{
|
|
return (void *)elf->hdr +
|
|
elf->sechdrs[elf->secindex_strings].sh_offset +
|
|
sechdr->sh_name;
|
|
}
|
|
|
|
/* The pattern is an array of simple patterns.
|
|
* "foo" will match an exact string equal to "foo"
|
|
* "*foo" will match a string that ends with "foo"
|
|
* "foo*" will match a string that begins with "foo"
|
|
* "*foo*" will match a string that contains "foo"
|
|
*/
|
|
static int match(const char *sym, const char * const pat[])
|
|
{
|
|
const char *p;
|
|
while (*pat) {
|
|
p = *pat++;
|
|
const char *endp = p + strlen(p) - 1;
|
|
|
|
/* "*foo*" */
|
|
if (*p == '*' && *endp == '*') {
|
|
char *here, *bare = strndup(p + 1, strlen(p) - 2);
|
|
|
|
here = strstr(sym, bare);
|
|
free(bare);
|
|
if (here != NULL)
|
|
return 1;
|
|
}
|
|
/* "*foo" */
|
|
else if (*p == '*') {
|
|
if (strrcmp(sym, p + 1) == 0)
|
|
return 1;
|
|
}
|
|
/* "foo*" */
|
|
else if (*endp == '*') {
|
|
if (strncmp(sym, p, strlen(p) - 1) == 0)
|
|
return 1;
|
|
}
|
|
/* no wildcards */
|
|
else {
|
|
if (strcmp(p, sym) == 0)
|
|
return 1;
|
|
}
|
|
}
|
|
/* no match */
|
|
return 0;
|
|
}
|
|
|
|
/* sections that we do not want to do full section mismatch check on */
|
|
static const char *const section_white_list[] =
|
|
{
|
|
".comment*",
|
|
".debug*",
|
|
".cranges", /* sh64 */
|
|
".zdebug*", /* Compressed debug sections. */
|
|
".GCC-command-line", /* mn10300 */
|
|
".GCC.command.line", /* record-gcc-switches, non mn10300 */
|
|
".mdebug*", /* alpha, score, mips etc. */
|
|
".pdr", /* alpha, score, mips etc. */
|
|
".stab*",
|
|
".note*",
|
|
".got*",
|
|
".toc*",
|
|
".xt.prop", /* xtensa */
|
|
".xt.lit", /* xtensa */
|
|
".arcextmap*", /* arc */
|
|
".gnu.linkonce.arcext*", /* arc : modules */
|
|
".cmem*", /* EZchip */
|
|
".fmt_slot*", /* EZchip */
|
|
".gnu.lto*",
|
|
NULL
|
|
};
|
|
|
|
/*
|
|
* This is used to find sections missing the SHF_ALLOC flag.
|
|
* The cause of this is often a section specified in assembler
|
|
* without "ax" / "aw".
|
|
*/
|
|
static void check_section(const char *modname, struct elf_info *elf,
|
|
Elf_Shdr *sechdr)
|
|
{
|
|
const char *sec = sech_name(elf, sechdr);
|
|
|
|
if (sechdr->sh_type == SHT_PROGBITS &&
|
|
!(sechdr->sh_flags & SHF_ALLOC) &&
|
|
!match(sec, section_white_list)) {
|
|
warn("%s (%s): unexpected non-allocatable section.\n"
|
|
"Did you forget to use \"ax\"/\"aw\" in a .S file?\n"
|
|
"Note that for example <linux/init.h> contains\n"
|
|
"section definitions for use in .S files.\n\n",
|
|
modname, sec);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
#define ALL_INIT_DATA_SECTIONS \
|
|
".init.setup", ".init.rodata", ".meminit.rodata", \
|
|
".init.data", ".meminit.data"
|
|
#define ALL_EXIT_DATA_SECTIONS \
|
|
".exit.data", ".memexit.data"
|
|
|
|
#define ALL_INIT_TEXT_SECTIONS \
|
|
".init.text", ".meminit.text"
|
|
#define ALL_EXIT_TEXT_SECTIONS \
|
|
".exit.text", ".memexit.text"
|
|
|
|
#define ALL_PCI_INIT_SECTIONS \
|
|
".pci_fixup_early", ".pci_fixup_header", ".pci_fixup_final", \
|
|
".pci_fixup_enable", ".pci_fixup_resume", \
|
|
".pci_fixup_resume_early", ".pci_fixup_suspend"
|
|
|
|
#define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS
|
|
#define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS
|
|
|
|
#define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
|
|
#define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
|
|
|
|
#define DATA_SECTIONS ".data", ".data.rel"
|
|
#define TEXT_SECTIONS ".text", ".text.unlikely", ".sched.text", \
|
|
".kprobes.text", ".cpuidle.text"
|
|
#define OTHER_TEXT_SECTIONS ".ref.text", ".head.text", ".spinlock.text", \
|
|
".fixup", ".entry.text", ".exception.text", ".text.*", \
|
|
".coldtext"
|
|
|
|
#define INIT_SECTIONS ".init.*"
|
|
#define MEM_INIT_SECTIONS ".meminit.*"
|
|
|
|
#define EXIT_SECTIONS ".exit.*"
|
|
#define MEM_EXIT_SECTIONS ".memexit.*"
|
|
|
|
#define ALL_TEXT_SECTIONS ALL_INIT_TEXT_SECTIONS, ALL_EXIT_TEXT_SECTIONS, \
|
|
TEXT_SECTIONS, OTHER_TEXT_SECTIONS
|
|
|
|
/* init data sections */
|
|
static const char *const init_data_sections[] =
|
|
{ ALL_INIT_DATA_SECTIONS, NULL };
|
|
|
|
/* all init sections */
|
|
static const char *const init_sections[] = { ALL_INIT_SECTIONS, NULL };
|
|
|
|
/* All init and exit sections (code + data) */
|
|
static const char *const init_exit_sections[] =
|
|
{ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };
|
|
|
|
/* all text sections */
|
|
static const char *const text_sections[] = { ALL_TEXT_SECTIONS, NULL };
|
|
|
|
/* data section */
|
|
static const char *const data_sections[] = { DATA_SECTIONS, NULL };
|
|
|
|
|
|
/* symbols in .data that may refer to init/exit sections */
|
|
#define DEFAULT_SYMBOL_WHITE_LIST \
|
|
"*driver", \
|
|
"*_template", /* scsi uses *_template a lot */ \
|
|
"*_timer", /* arm uses ops structures named _timer a lot */ \
|
|
"*_sht", /* scsi also used *_sht to some extent */ \
|
|
"*_ops", \
|
|
"*_probe", \
|
|
"*_probe_one", \
|
|
"*_console"
|
|
|
|
static const char *const head_sections[] = { ".head.text*", NULL };
|
|
static const char *const linker_symbols[] =
|
|
{ "__init_begin", "_sinittext", "_einittext", NULL };
|
|
static const char *const optim_symbols[] = { "*.constprop.*", NULL };
|
|
|
|
enum mismatch {
|
|
TEXT_TO_ANY_INIT,
|
|
DATA_TO_ANY_INIT,
|
|
TEXT_TO_ANY_EXIT,
|
|
DATA_TO_ANY_EXIT,
|
|
XXXINIT_TO_SOME_INIT,
|
|
XXXEXIT_TO_SOME_EXIT,
|
|
ANY_INIT_TO_ANY_EXIT,
|
|
ANY_EXIT_TO_ANY_INIT,
|
|
EXPORT_TO_INIT_EXIT,
|
|
EXTABLE_TO_NON_TEXT,
|
|
};
|
|
|
|
/**
|
|
* Describe how to match sections on different criterias:
|
|
*
|
|
* @fromsec: Array of sections to be matched.
|
|
*
|
|
* @bad_tosec: Relocations applied to a section in @fromsec to a section in
|
|
* this array is forbidden (black-list). Can be empty.
|
|
*
|
|
* @good_tosec: Relocations applied to a section in @fromsec must be
|
|
* targetting sections in this array (white-list). Can be empty.
|
|
*
|
|
* @mismatch: Type of mismatch.
|
|
*
|
|
* @symbol_white_list: Do not match a relocation to a symbol in this list
|
|
* even if it is targetting a section in @bad_to_sec.
|
|
*
|
|
* @handler: Specific handler to call when a match is found. If NULL,
|
|
* default_mismatch_handler() will be called.
|
|
*
|
|
*/
|
|
struct sectioncheck {
|
|
const char *fromsec[20];
|
|
const char *bad_tosec[20];
|
|
const char *good_tosec[20];
|
|
enum mismatch mismatch;
|
|
const char *symbol_white_list[20];
|
|
void (*handler)(const char *modname, struct elf_info *elf,
|
|
const struct sectioncheck* const mismatch,
|
|
Elf_Rela *r, Elf_Sym *sym, const char *fromsec);
|
|
|
|
};
|
|
|
|
static void extable_mismatch_handler(const char *modname, struct elf_info *elf,
|
|
const struct sectioncheck* const mismatch,
|
|
Elf_Rela *r, Elf_Sym *sym,
|
|
const char *fromsec);
|
|
|
|
static const struct sectioncheck sectioncheck[] = {
|
|
/* Do not reference init/exit code/data from
|
|
* normal code and data
|
|
*/
|
|
{
|
|
.fromsec = { TEXT_SECTIONS, NULL },
|
|
.bad_tosec = { ALL_INIT_SECTIONS, NULL },
|
|
.mismatch = TEXT_TO_ANY_INIT,
|
|
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
|
|
},
|
|
{
|
|
.fromsec = { DATA_SECTIONS, NULL },
|
|
.bad_tosec = { ALL_XXXINIT_SECTIONS, NULL },
|
|
.mismatch = DATA_TO_ANY_INIT,
|
|
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
|
|
},
|
|
{
|
|
.fromsec = { DATA_SECTIONS, NULL },
|
|
.bad_tosec = { INIT_SECTIONS, NULL },
|
|
.mismatch = DATA_TO_ANY_INIT,
|
|
.symbol_white_list = {
|
|
"*_template", "*_timer", "*_sht", "*_ops",
|
|
"*_probe", "*_probe_one", "*_console", NULL
|
|
},
|
|
},
|
|
{
|
|
.fromsec = { TEXT_SECTIONS, NULL },
|
|
.bad_tosec = { ALL_EXIT_SECTIONS, NULL },
|
|
.mismatch = TEXT_TO_ANY_EXIT,
|
|
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
|
|
},
|
|
{
|
|
.fromsec = { DATA_SECTIONS, NULL },
|
|
.bad_tosec = { ALL_EXIT_SECTIONS, NULL },
|
|
.mismatch = DATA_TO_ANY_EXIT,
|
|
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
|
|
},
|
|
/* Do not reference init code/data from meminit code/data */
|
|
{
|
|
.fromsec = { ALL_XXXINIT_SECTIONS, NULL },
|
|
.bad_tosec = { INIT_SECTIONS, NULL },
|
|
.mismatch = XXXINIT_TO_SOME_INIT,
|
|
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
|
|
},
|
|
/* Do not reference exit code/data from memexit code/data */
|
|
{
|
|
.fromsec = { ALL_XXXEXIT_SECTIONS, NULL },
|
|
.bad_tosec = { EXIT_SECTIONS, NULL },
|
|
.mismatch = XXXEXIT_TO_SOME_EXIT,
|
|
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
|
|
},
|
|
/* Do not use exit code/data from init code */
|
|
{
|
|
.fromsec = { ALL_INIT_SECTIONS, NULL },
|
|
.bad_tosec = { ALL_EXIT_SECTIONS, NULL },
|
|
.mismatch = ANY_INIT_TO_ANY_EXIT,
|
|
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
|
|
},
|
|
/* Do not use init code/data from exit code */
|
|
{
|
|
.fromsec = { ALL_EXIT_SECTIONS, NULL },
|
|
.bad_tosec = { ALL_INIT_SECTIONS, NULL },
|
|
.mismatch = ANY_EXIT_TO_ANY_INIT,
|
|
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
|
|
},
|
|
{
|
|
.fromsec = { ALL_PCI_INIT_SECTIONS, NULL },
|
|
.bad_tosec = { INIT_SECTIONS, NULL },
|
|
.mismatch = ANY_INIT_TO_ANY_EXIT,
|
|
.symbol_white_list = { NULL },
|
|
},
|
|
/* Do not export init/exit functions or data */
|
|
{
|
|
.fromsec = { "__ksymtab*", NULL },
|
|
.bad_tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
|
|
.mismatch = EXPORT_TO_INIT_EXIT,
|
|
.symbol_white_list = { DEFAULT_SYMBOL_WHITE_LIST, NULL },
|
|
},
|
|
{
|
|
.fromsec = { "__ex_table", NULL },
|
|
/* If you're adding any new black-listed sections in here, consider
|
|
* adding a special 'printer' for them in scripts/check_extable.
|
|
*/
|
|
.bad_tosec = { ".altinstr_replacement", NULL },
|
|
.good_tosec = {ALL_TEXT_SECTIONS , NULL},
|
|
.mismatch = EXTABLE_TO_NON_TEXT,
|
|
.handler = extable_mismatch_handler,
|
|
}
|
|
};
|
|
|
|
static const struct sectioncheck *section_mismatch(
|
|
const char *fromsec, const char *tosec)
|
|
{
|
|
int i;
|
|
int elems = sizeof(sectioncheck) / sizeof(struct sectioncheck);
|
|
const struct sectioncheck *check = §ioncheck[0];
|
|
|
|
/*
|
|
* The target section could be the SHT_NUL section when we're
|
|
* handling relocations to un-resolved symbols, trying to match it
|
|
* doesn't make much sense and causes build failures on parisc and
|
|
* mn10300 architectures.
|
|
*/
|
|
if (*tosec == '\0')
|
|
return NULL;
|
|
|
|
for (i = 0; i < elems; i++) {
|
|
if (match(fromsec, check->fromsec)) {
|
|
if (check->bad_tosec[0] && match(tosec, check->bad_tosec))
|
|
return check;
|
|
if (check->good_tosec[0] && !match(tosec, check->good_tosec))
|
|
return check;
|
|
}
|
|
check++;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* Whitelist to allow certain references to pass with no warning.
|
|
*
|
|
* Pattern 1:
|
|
* If a module parameter is declared __initdata and permissions=0
|
|
* then this is legal despite the warning generated.
|
|
* We cannot see value of permissions here, so just ignore
|
|
* this pattern.
|
|
* The pattern is identified by:
|
|
* tosec = .init.data
|
|
* fromsec = .data*
|
|
* atsym =__param*
|
|
*
|
|
* Pattern 1a:
|
|
* module_param_call() ops can refer to __init set function if permissions=0
|
|
* The pattern is identified by:
|
|
* tosec = .init.text
|
|
* fromsec = .data*
|
|
* atsym = __param_ops_*
|
|
*
|
|
* Pattern 2:
|
|
* Many drivers utilise a *driver container with references to
|
|
* add, remove, probe functions etc.
|
|
* the pattern is identified by:
|
|
* tosec = init or exit section
|
|
* fromsec = data section
|
|
* atsym = *driver, *_template, *_sht, *_ops, *_probe,
|
|
* *probe_one, *_console, *_timer
|
|
*
|
|
* Pattern 3:
|
|
* Whitelist all references from .head.text to any init section
|
|
*
|
|
* Pattern 4:
|
|
* Some symbols belong to init section but still it is ok to reference
|
|
* these from non-init sections as these symbols don't have any memory
|
|
* allocated for them and symbol address and value are same. So even
|
|
* if init section is freed, its ok to reference those symbols.
|
|
* For ex. symbols marking the init section boundaries.
|
|
* This pattern is identified by
|
|
* refsymname = __init_begin, _sinittext, _einittext
|
|
*
|
|
* Pattern 5:
|
|
* GCC may optimize static inlines when fed constant arg(s) resulting
|
|
* in functions like cpumask_empty() -- generating an associated symbol
|
|
* cpumask_empty.constprop.3 that appears in the audit. If the const that
|
|
* is passed in comes from __init, like say nmi_ipi_mask, we get a
|
|
* meaningless section warning. May need to add isra symbols too...
|
|
* This pattern is identified by
|
|
* tosec = init section
|
|
* fromsec = text section
|
|
* refsymname = *.constprop.*
|
|
*
|
|
**/
|
|
static int secref_whitelist(const struct sectioncheck *mismatch,
|
|
const char *fromsec, const char *fromsym,
|
|
const char *tosec, const char *tosym)
|
|
{
|
|
/* Check for pattern 1 */
|
|
if (match(tosec, init_data_sections) &&
|
|
match(fromsec, data_sections) &&
|
|
(strncmp(fromsym, "__param", strlen("__param")) == 0))
|
|
return 0;
|
|
|
|
/* Check for pattern 1a */
|
|
if (strcmp(tosec, ".init.text") == 0 &&
|
|
match(fromsec, data_sections) &&
|
|
(strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0))
|
|
return 0;
|
|
|
|
/* Check for pattern 2 */
|
|
if (match(tosec, init_exit_sections) &&
|
|
match(fromsec, data_sections) &&
|
|
match(fromsym, mismatch->symbol_white_list))
|
|
return 0;
|
|
|
|
/* Check for pattern 3 */
|
|
if (match(fromsec, head_sections) &&
|
|
match(tosec, init_sections))
|
|
return 0;
|
|
|
|
/* Check for pattern 4 */
|
|
if (match(tosym, linker_symbols))
|
|
return 0;
|
|
|
|
/* Check for pattern 5 */
|
|
if (match(fromsec, text_sections) &&
|
|
match(tosec, init_sections) &&
|
|
match(fromsym, optim_symbols))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* Find symbol based on relocation record info.
|
|
* In some cases the symbol supplied is a valid symbol so
|
|
* return refsym. If st_name != 0 we assume this is a valid symbol.
|
|
* In other cases the symbol needs to be looked up in the symbol table
|
|
* based on section and address.
|
|
* **/
|
|
static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
|
|
Elf_Sym *relsym)
|
|
{
|
|
Elf_Sym *sym;
|
|
Elf_Sym *near = NULL;
|
|
Elf64_Sword distance = 20;
|
|
Elf64_Sword d;
|
|
unsigned int relsym_secindex;
|
|
|
|
if (relsym->st_name != 0)
|
|
return relsym;
|
|
|
|
relsym_secindex = get_secindex(elf, relsym);
|
|
for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
|
|
if (get_secindex(elf, sym) != relsym_secindex)
|
|
continue;
|
|
if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
|
|
continue;
|
|
if (sym->st_value == addr)
|
|
return sym;
|
|
/* Find a symbol nearby - addr are maybe negative */
|
|
d = sym->st_value - addr;
|
|
if (d < 0)
|
|
d = addr - sym->st_value;
|
|
if (d < distance) {
|
|
distance = d;
|
|
near = sym;
|
|
}
|
|
}
|
|
/* We need a close match */
|
|
if (distance < 20)
|
|
return near;
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
static inline int is_arm_mapping_symbol(const char *str)
|
|
{
|
|
return str[0] == '$' && strchr("axtd", str[1])
|
|
&& (str[2] == '\0' || str[2] == '.');
|
|
}
|
|
|
|
/*
|
|
* If there's no name there, ignore it; likewise, ignore it if it's
|
|
* one of the magic symbols emitted used by current ARM tools.
|
|
*
|
|
* Otherwise if find_symbols_between() returns those symbols, they'll
|
|
* fail the whitelist tests and cause lots of false alarms ... fixable
|
|
* only by merging __exit and __init sections into __text, bloating
|
|
* the kernel (which is especially evil on embedded platforms).
|
|
*/
|
|
static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
|
|
{
|
|
const char *name = elf->strtab + sym->st_name;
|
|
|
|
if (!name || !strlen(name))
|
|
return 0;
|
|
return !is_arm_mapping_symbol(name);
|
|
}
|
|
|
|
/*
|
|
* Find symbols before or equal addr and after addr - in the section sec.
|
|
* If we find two symbols with equal offset prefer one with a valid name.
|
|
* The ELF format may have a better way to detect what type of symbol
|
|
* it is, but this works for now.
|
|
**/
|
|
static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
|
|
const char *sec)
|
|
{
|
|
Elf_Sym *sym;
|
|
Elf_Sym *near = NULL;
|
|
Elf_Addr distance = ~0;
|
|
|
|
for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
|
|
const char *symsec;
|
|
|
|
if (is_shndx_special(sym->st_shndx))
|
|
continue;
|
|
symsec = sec_name(elf, get_secindex(elf, sym));
|
|
if (strcmp(symsec, sec) != 0)
|
|
continue;
|
|
if (!is_valid_name(elf, sym))
|
|
continue;
|
|
if (sym->st_value <= addr) {
|
|
if ((addr - sym->st_value) < distance) {
|
|
distance = addr - sym->st_value;
|
|
near = sym;
|
|
} else if ((addr - sym->st_value) == distance) {
|
|
near = sym;
|
|
}
|
|
}
|
|
}
|
|
return near;
|
|
}
|
|
|
|
/*
|
|
* Convert a section name to the function/data attribute
|
|
* .init.text => __init
|
|
* .memexitconst => __memconst
|
|
* etc.
|
|
*
|
|
* The memory of returned value has been allocated on a heap. The user of this
|
|
* method should free it after usage.
|
|
*/
|
|
static char *sec2annotation(const char *s)
|
|
{
|
|
if (match(s, init_exit_sections)) {
|
|
char *p = malloc(20);
|
|
char *r = p;
|
|
|
|
*p++ = '_';
|
|
*p++ = '_';
|
|
if (*s == '.')
|
|
s++;
|
|
while (*s && *s != '.')
|
|
*p++ = *s++;
|
|
*p = '\0';
|
|
if (*s == '.')
|
|
s++;
|
|
if (strstr(s, "rodata") != NULL)
|
|
strcat(p, "const ");
|
|
else if (strstr(s, "data") != NULL)
|
|
strcat(p, "data ");
|
|
else
|
|
strcat(p, " ");
|
|
return r;
|
|
} else {
|
|
return strdup("");
|
|
}
|
|
}
|
|
|
|
static int is_function(Elf_Sym *sym)
|
|
{
|
|
if (sym)
|
|
return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
|
|
else
|
|
return -1;
|
|
}
|
|
|
|
static void print_section_list(const char * const list[20])
|
|
{
|
|
const char *const *s = list;
|
|
|
|
while (*s) {
|
|
fprintf(stderr, "%s", *s);
|
|
s++;
|
|
if (*s)
|
|
fprintf(stderr, ", ");
|
|
}
|
|
fprintf(stderr, "\n");
|
|
}
|
|
|
|
static inline void get_pretty_name(int is_func, const char** name, const char** name_p)
|
|
{
|
|
switch (is_func) {
|
|
case 0: *name = "variable"; *name_p = ""; break;
|
|
case 1: *name = "function"; *name_p = "()"; break;
|
|
default: *name = "(unknown reference)"; *name_p = ""; break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Print a warning about a section mismatch.
|
|
* Try to find symbols near it so user can find it.
|
|
* Check whitelist before warning - it may be a false positive.
|
|
*/
|
|
static void report_sec_mismatch(const char *modname,
|
|
const struct sectioncheck *mismatch,
|
|
const char *fromsec,
|
|
unsigned long long fromaddr,
|
|
const char *fromsym,
|
|
int from_is_func,
|
|
const char *tosec, const char *tosym,
|
|
int to_is_func)
|
|
{
|
|
const char *from, *from_p;
|
|
const char *to, *to_p;
|
|
char *prl_from;
|
|
char *prl_to;
|
|
|
|
sec_mismatch_count++;
|
|
if (!sec_mismatch_verbose)
|
|
return;
|
|
|
|
get_pretty_name(from_is_func, &from, &from_p);
|
|
get_pretty_name(to_is_func, &to, &to_p);
|
|
|
|
warn("%s(%s+0x%llx): Section mismatch in reference from the %s %s%s "
|
|
"to the %s %s:%s%s\n",
|
|
modname, fromsec, fromaddr, from, fromsym, from_p, to, tosec,
|
|
tosym, to_p);
|
|
|
|
switch (mismatch->mismatch) {
|
|
case TEXT_TO_ANY_INIT:
|
|
prl_from = sec2annotation(fromsec);
|
|
prl_to = sec2annotation(tosec);
|
|
fprintf(stderr,
|
|
"The function %s%s() references\n"
|
|
"the %s %s%s%s.\n"
|
|
"This is often because %s lacks a %s\n"
|
|
"annotation or the annotation of %s is wrong.\n",
|
|
prl_from, fromsym,
|
|
to, prl_to, tosym, to_p,
|
|
fromsym, prl_to, tosym);
|
|
free(prl_from);
|
|
free(prl_to);
|
|
break;
|
|
case DATA_TO_ANY_INIT: {
|
|
prl_to = sec2annotation(tosec);
|
|
fprintf(stderr,
|
|
"The variable %s references\n"
|
|
"the %s %s%s%s\n"
|
|
"If the reference is valid then annotate the\n"
|
|
"variable with __init* or __refdata (see linux/init.h) "
|
|
"or name the variable:\n",
|
|
fromsym, to, prl_to, tosym, to_p);
|
|
print_section_list(mismatch->symbol_white_list);
|
|
free(prl_to);
|
|
break;
|
|
}
|
|
case TEXT_TO_ANY_EXIT:
|
|
prl_to = sec2annotation(tosec);
|
|
fprintf(stderr,
|
|
"The function %s() references a %s in an exit section.\n"
|
|
"Often the %s %s%s has valid usage outside the exit section\n"
|
|
"and the fix is to remove the %sannotation of %s.\n",
|
|
fromsym, to, to, tosym, to_p, prl_to, tosym);
|
|
free(prl_to);
|
|
break;
|
|
case DATA_TO_ANY_EXIT: {
|
|
prl_to = sec2annotation(tosec);
|
|
fprintf(stderr,
|
|
"The variable %s references\n"
|
|
"the %s %s%s%s\n"
|
|
"If the reference is valid then annotate the\n"
|
|
"variable with __exit* (see linux/init.h) or "
|
|
"name the variable:\n",
|
|
fromsym, to, prl_to, tosym, to_p);
|
|
print_section_list(mismatch->symbol_white_list);
|
|
free(prl_to);
|
|
break;
|
|
}
|
|
case XXXINIT_TO_SOME_INIT:
|
|
case XXXEXIT_TO_SOME_EXIT:
|
|
prl_from = sec2annotation(fromsec);
|
|
prl_to = sec2annotation(tosec);
|
|
fprintf(stderr,
|
|
"The %s %s%s%s references\n"
|
|
"a %s %s%s%s.\n"
|
|
"If %s is only used by %s then\n"
|
|
"annotate %s with a matching annotation.\n",
|
|
from, prl_from, fromsym, from_p,
|
|
to, prl_to, tosym, to_p,
|
|
tosym, fromsym, tosym);
|
|
free(prl_from);
|
|
free(prl_to);
|
|
break;
|
|
case ANY_INIT_TO_ANY_EXIT:
|
|
prl_from = sec2annotation(fromsec);
|
|
prl_to = sec2annotation(tosec);
|
|
fprintf(stderr,
|
|
"The %s %s%s%s references\n"
|
|
"a %s %s%s%s.\n"
|
|
"This is often seen when error handling "
|
|
"in the init function\n"
|
|
"uses functionality in the exit path.\n"
|
|
"The fix is often to remove the %sannotation of\n"
|
|
"%s%s so it may be used outside an exit section.\n",
|
|
from, prl_from, fromsym, from_p,
|
|
to, prl_to, tosym, to_p,
|
|
prl_to, tosym, to_p);
|
|
free(prl_from);
|
|
free(prl_to);
|
|
break;
|
|
case ANY_EXIT_TO_ANY_INIT:
|
|
prl_from = sec2annotation(fromsec);
|
|
prl_to = sec2annotation(tosec);
|
|
fprintf(stderr,
|
|
"The %s %s%s%s references\n"
|
|
"a %s %s%s%s.\n"
|
|
"This is often seen when error handling "
|
|
"in the exit function\n"
|
|
"uses functionality in the init path.\n"
|
|
"The fix is often to remove the %sannotation of\n"
|
|
"%s%s so it may be used outside an init section.\n",
|
|
from, prl_from, fromsym, from_p,
|
|
to, prl_to, tosym, to_p,
|
|
prl_to, tosym, to_p);
|
|
free(prl_from);
|
|
free(prl_to);
|
|
break;
|
|
case EXPORT_TO_INIT_EXIT:
|
|
prl_to = sec2annotation(tosec);
|
|
fprintf(stderr,
|
|
"The symbol %s is exported and annotated %s\n"
|
|
"Fix this by removing the %sannotation of %s "
|
|
"or drop the export.\n",
|
|
tosym, prl_to, prl_to, tosym);
|
|
free(prl_to);
|
|
break;
|
|
case EXTABLE_TO_NON_TEXT:
|
|
fatal("There's a special handler for this mismatch type, "
|
|
"we should never get here.");
|
|
break;
|
|
}
|
|
fprintf(stderr, "\n");
|
|
}
|
|
|
|
static void default_mismatch_handler(const char *modname, struct elf_info *elf,
|
|
const struct sectioncheck* const mismatch,
|
|
Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
|
|
{
|
|
const char *tosec;
|
|
Elf_Sym *to;
|
|
Elf_Sym *from;
|
|
const char *tosym;
|
|
const char *fromsym;
|
|
|
|
from = find_elf_symbol2(elf, r->r_offset, fromsec);
|
|
fromsym = sym_name(elf, from);
|
|
|
|
if (!strncmp(fromsym, "reference___initcall",
|
|
sizeof("reference___initcall")-1))
|
|
return;
|
|
|
|
tosec = sec_name(elf, get_secindex(elf, sym));
|
|
to = find_elf_symbol(elf, r->r_addend, sym);
|
|
tosym = sym_name(elf, to);
|
|
|
|
/* check whitelist - we may ignore it */
|
|
if (secref_whitelist(mismatch,
|
|
fromsec, fromsym, tosec, tosym)) {
|
|
report_sec_mismatch(modname, mismatch,
|
|
fromsec, r->r_offset, fromsym,
|
|
is_function(from), tosec, tosym,
|
|
is_function(to));
|
|
}
|
|
}
|
|
|
|
static int is_executable_section(struct elf_info* elf, unsigned int section_index)
|
|
{
|
|
if (section_index > elf->num_sections)
|
|
fatal("section_index is outside elf->num_sections!\n");
|
|
|
|
return ((elf->sechdrs[section_index].sh_flags & SHF_EXECINSTR) == SHF_EXECINSTR);
|
|
}
|
|
|
|
/*
|
|
* We rely on a gross hack in section_rel[a]() calling find_extable_entry_size()
|
|
* to know the sizeof(struct exception_table_entry) for the target architecture.
|
|
*/
|
|
static unsigned int extable_entry_size = 0;
|
|
static void find_extable_entry_size(const char* const sec, const Elf_Rela* r)
|
|
{
|
|
/*
|
|
* If we're currently checking the second relocation within __ex_table,
|
|
* that relocation offset tells us the offsetof(struct
|
|
* exception_table_entry, fixup) which is equal to sizeof(struct
|
|
* exception_table_entry) divided by two. We use that to our advantage
|
|
* since there's no portable way to get that size as every architecture
|
|
* seems to go with different sized types. Not pretty but better than
|
|
* hard-coding the size for every architecture..
|
|
*/
|
|
if (!extable_entry_size)
|
|
extable_entry_size = r->r_offset * 2;
|
|
}
|
|
|
|
static inline bool is_extable_fault_address(Elf_Rela *r)
|
|
{
|
|
/*
|
|
* extable_entry_size is only discovered after we've handled the
|
|
* _second_ relocation in __ex_table, so only abort when we're not
|
|
* handling the first reloc and extable_entry_size is zero.
|
|
*/
|
|
if (r->r_offset && extable_entry_size == 0)
|
|
fatal("extable_entry size hasn't been discovered!\n");
|
|
|
|
return ((r->r_offset == 0) ||
|
|
(r->r_offset % extable_entry_size == 0));
|
|
}
|
|
|
|
#define is_second_extable_reloc(Start, Cur, Sec) \
|
|
(((Cur) == (Start) + 1) && (strcmp("__ex_table", (Sec)) == 0))
|
|
|
|
static void report_extable_warnings(const char* modname, struct elf_info* elf,
|
|
const struct sectioncheck* const mismatch,
|
|
Elf_Rela* r, Elf_Sym* sym,
|
|
const char* fromsec, const char* tosec)
|
|
{
|
|
Elf_Sym* fromsym = find_elf_symbol2(elf, r->r_offset, fromsec);
|
|
const char* fromsym_name = sym_name(elf, fromsym);
|
|
Elf_Sym* tosym = find_elf_symbol(elf, r->r_addend, sym);
|
|
const char* tosym_name = sym_name(elf, tosym);
|
|
const char* from_pretty_name;
|
|
const char* from_pretty_name_p;
|
|
const char* to_pretty_name;
|
|
const char* to_pretty_name_p;
|
|
|
|
get_pretty_name(is_function(fromsym),
|
|
&from_pretty_name, &from_pretty_name_p);
|
|
get_pretty_name(is_function(tosym),
|
|
&to_pretty_name, &to_pretty_name_p);
|
|
|
|
warn("%s(%s+0x%lx): Section mismatch in reference"
|
|
" from the %s %s%s to the %s %s:%s%s\n",
|
|
modname, fromsec, (long)r->r_offset, from_pretty_name,
|
|
fromsym_name, from_pretty_name_p,
|
|
to_pretty_name, tosec, tosym_name, to_pretty_name_p);
|
|
|
|
if (!match(tosec, mismatch->bad_tosec) &&
|
|
is_executable_section(elf, get_secindex(elf, sym)))
|
|
fprintf(stderr,
|
|
"The relocation at %s+0x%lx references\n"
|
|
"section \"%s\" which is not in the list of\n"
|
|
"authorized sections. If you're adding a new section\n"
|
|
"and/or if this reference is valid, add \"%s\" to the\n"
|
|
"list of authorized sections to jump to on fault.\n"
|
|
"This can be achieved by adding \"%s\" to \n"
|
|
"OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.\n",
|
|
fromsec, (long)r->r_offset, tosec, tosec, tosec);
|
|
}
|
|
|
|
static void extable_mismatch_handler(const char* modname, struct elf_info *elf,
|
|
const struct sectioncheck* const mismatch,
|
|
Elf_Rela* r, Elf_Sym* sym,
|
|
const char *fromsec)
|
|
{
|
|
const char* tosec = sec_name(elf, get_secindex(elf, sym));
|
|
|
|
sec_mismatch_count++;
|
|
|
|
if (sec_mismatch_verbose)
|
|
report_extable_warnings(modname, elf, mismatch, r, sym,
|
|
fromsec, tosec);
|
|
|
|
if (match(tosec, mismatch->bad_tosec))
|
|
fatal("The relocation at %s+0x%lx references\n"
|
|
"section \"%s\" which is black-listed.\n"
|
|
"Something is seriously wrong and should be fixed.\n"
|
|
"You might get more information about where this is\n"
|
|
"coming from by using scripts/check_extable.sh %s\n",
|
|
fromsec, (long)r->r_offset, tosec, modname);
|
|
else if (!is_executable_section(elf, get_secindex(elf, sym))) {
|
|
if (is_extable_fault_address(r))
|
|
fatal("The relocation at %s+0x%lx references\n"
|
|
"section \"%s\" which is not executable, IOW\n"
|
|
"it is not possible for the kernel to fault\n"
|
|
"at that address. Something is seriously wrong\n"
|
|
"and should be fixed.\n",
|
|
fromsec, (long)r->r_offset, tosec);
|
|
else
|
|
fatal("The relocation at %s+0x%lx references\n"
|
|
"section \"%s\" which is not executable, IOW\n"
|
|
"the kernel will fault if it ever tries to\n"
|
|
"jump to it. Something is seriously wrong\n"
|
|
"and should be fixed.\n",
|
|
fromsec, (long)r->r_offset, tosec);
|
|
}
|
|
}
|
|
|
|
static void check_section_mismatch(const char *modname, struct elf_info *elf,
|
|
Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
|
|
{
|
|
const char *tosec = sec_name(elf, get_secindex(elf, sym));;
|
|
const struct sectioncheck *mismatch = section_mismatch(fromsec, tosec);
|
|
|
|
if (mismatch) {
|
|
if (mismatch->handler)
|
|
mismatch->handler(modname, elf, mismatch,
|
|
r, sym, fromsec);
|
|
else
|
|
default_mismatch_handler(modname, elf, mismatch,
|
|
r, sym, fromsec);
|
|
}
|
|
}
|
|
|
|
static unsigned int *reloc_location(struct elf_info *elf,
|
|
Elf_Shdr *sechdr, Elf_Rela *r)
|
|
{
|
|
Elf_Shdr *sechdrs = elf->sechdrs;
|
|
int section = sechdr->sh_info;
|
|
|
|
return (void *)elf->hdr + sechdrs[section].sh_offset +
|
|
r->r_offset;
|
|
}
|
|
|
|
static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
|
|
{
|
|
unsigned int r_typ = ELF_R_TYPE(r->r_info);
|
|
unsigned int *location = reloc_location(elf, sechdr, r);
|
|
|
|
switch (r_typ) {
|
|
case R_386_32:
|
|
r->r_addend = TO_NATIVE(*location);
|
|
break;
|
|
case R_386_PC32:
|
|
r->r_addend = TO_NATIVE(*location) + 4;
|
|
/* For CONFIG_RELOCATABLE=y */
|
|
if (elf->hdr->e_type == ET_EXEC)
|
|
r->r_addend += r->r_offset;
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifndef R_ARM_CALL
|
|
#define R_ARM_CALL 28
|
|
#endif
|
|
#ifndef R_ARM_JUMP24
|
|
#define R_ARM_JUMP24 29
|
|
#endif
|
|
|
|
#ifndef R_ARM_THM_CALL
|
|
#define R_ARM_THM_CALL 10
|
|
#endif
|
|
#ifndef R_ARM_THM_JUMP24
|
|
#define R_ARM_THM_JUMP24 30
|
|
#endif
|
|
#ifndef R_ARM_THM_JUMP19
|
|
#define R_ARM_THM_JUMP19 51
|
|
#endif
|
|
|
|
static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
|
|
{
|
|
unsigned int r_typ = ELF_R_TYPE(r->r_info);
|
|
|
|
switch (r_typ) {
|
|
case R_ARM_ABS32:
|
|
/* From ARM ABI: (S + A) | T */
|
|
r->r_addend = (int)(long)
|
|
(elf->symtab_start + ELF_R_SYM(r->r_info));
|
|
break;
|
|
case R_ARM_PC24:
|
|
case R_ARM_CALL:
|
|
case R_ARM_JUMP24:
|
|
case R_ARM_THM_CALL:
|
|
case R_ARM_THM_JUMP24:
|
|
case R_ARM_THM_JUMP19:
|
|
/* From ARM ABI: ((S + A) | T) - P */
|
|
r->r_addend = (int)(long)(elf->hdr +
|
|
sechdr->sh_offset +
|
|
(r->r_offset - sechdr->sh_addr));
|
|
break;
|
|
default:
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
|
|
{
|
|
unsigned int r_typ = ELF_R_TYPE(r->r_info);
|
|
unsigned int *location = reloc_location(elf, sechdr, r);
|
|
unsigned int inst;
|
|
|
|
if (r_typ == R_MIPS_HI16)
|
|
return 1; /* skip this */
|
|
inst = TO_NATIVE(*location);
|
|
switch (r_typ) {
|
|
case R_MIPS_LO16:
|
|
r->r_addend = inst & 0xffff;
|
|
break;
|
|
case R_MIPS_26:
|
|
r->r_addend = (inst & 0x03ffffff) << 2;
|
|
break;
|
|
case R_MIPS_32:
|
|
r->r_addend = inst;
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void section_rela(const char *modname, struct elf_info *elf,
|
|
Elf_Shdr *sechdr)
|
|
{
|
|
Elf_Sym *sym;
|
|
Elf_Rela *rela;
|
|
Elf_Rela r;
|
|
unsigned int r_sym;
|
|
const char *fromsec;
|
|
|
|
Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
|
|
Elf_Rela *stop = (void *)start + sechdr->sh_size;
|
|
|
|
fromsec = sech_name(elf, sechdr);
|
|
fromsec += strlen(".rela");
|
|
/* if from section (name) is know good then skip it */
|
|
if (match(fromsec, section_white_list))
|
|
return;
|
|
|
|
for (rela = start; rela < stop; rela++) {
|
|
r.r_offset = TO_NATIVE(rela->r_offset);
|
|
#if KERNEL_ELFCLASS == ELFCLASS64
|
|
if (elf->hdr->e_machine == EM_MIPS) {
|
|
unsigned int r_typ;
|
|
r_sym = ELF64_MIPS_R_SYM(rela->r_info);
|
|
r_sym = TO_NATIVE(r_sym);
|
|
r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
|
|
r.r_info = ELF64_R_INFO(r_sym, r_typ);
|
|
} else {
|
|
r.r_info = TO_NATIVE(rela->r_info);
|
|
r_sym = ELF_R_SYM(r.r_info);
|
|
}
|
|
#else
|
|
r.r_info = TO_NATIVE(rela->r_info);
|
|
r_sym = ELF_R_SYM(r.r_info);
|
|
#endif
|
|
r.r_addend = TO_NATIVE(rela->r_addend);
|
|
sym = elf->symtab_start + r_sym;
|
|
/* Skip special sections */
|
|
if (is_shndx_special(sym->st_shndx))
|
|
continue;
|
|
if (is_second_extable_reloc(start, rela, fromsec))
|
|
find_extable_entry_size(fromsec, &r);
|
|
check_section_mismatch(modname, elf, &r, sym, fromsec);
|
|
}
|
|
}
|
|
|
|
static void section_rel(const char *modname, struct elf_info *elf,
|
|
Elf_Shdr *sechdr)
|
|
{
|
|
Elf_Sym *sym;
|
|
Elf_Rel *rel;
|
|
Elf_Rela r;
|
|
unsigned int r_sym;
|
|
const char *fromsec;
|
|
|
|
Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
|
|
Elf_Rel *stop = (void *)start + sechdr->sh_size;
|
|
|
|
fromsec = sech_name(elf, sechdr);
|
|
fromsec += strlen(".rel");
|
|
/* if from section (name) is know good then skip it */
|
|
if (match(fromsec, section_white_list))
|
|
return;
|
|
|
|
for (rel = start; rel < stop; rel++) {
|
|
r.r_offset = TO_NATIVE(rel->r_offset);
|
|
#if KERNEL_ELFCLASS == ELFCLASS64
|
|
if (elf->hdr->e_machine == EM_MIPS) {
|
|
unsigned int r_typ;
|
|
r_sym = ELF64_MIPS_R_SYM(rel->r_info);
|
|
r_sym = TO_NATIVE(r_sym);
|
|
r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
|
|
r.r_info = ELF64_R_INFO(r_sym, r_typ);
|
|
} else {
|
|
r.r_info = TO_NATIVE(rel->r_info);
|
|
r_sym = ELF_R_SYM(r.r_info);
|
|
}
|
|
#else
|
|
r.r_info = TO_NATIVE(rel->r_info);
|
|
r_sym = ELF_R_SYM(r.r_info);
|
|
#endif
|
|
r.r_addend = 0;
|
|
switch (elf->hdr->e_machine) {
|
|
case EM_386:
|
|
if (addend_386_rel(elf, sechdr, &r))
|
|
continue;
|
|
break;
|
|
case EM_ARM:
|
|
if (addend_arm_rel(elf, sechdr, &r))
|
|
continue;
|
|
break;
|
|
case EM_MIPS:
|
|
if (addend_mips_rel(elf, sechdr, &r))
|
|
continue;
|
|
break;
|
|
}
|
|
sym = elf->symtab_start + r_sym;
|
|
/* Skip special sections */
|
|
if (is_shndx_special(sym->st_shndx))
|
|
continue;
|
|
if (is_second_extable_reloc(start, rel, fromsec))
|
|
find_extable_entry_size(fromsec, &r);
|
|
check_section_mismatch(modname, elf, &r, sym, fromsec);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* A module includes a number of sections that are discarded
|
|
* either when loaded or when used as built-in.
|
|
* For loaded modules all functions marked __init and all data
|
|
* marked __initdata will be discarded when the module has been initialized.
|
|
* Likewise for modules used built-in the sections marked __exit
|
|
* are discarded because __exit marked function are supposed to be called
|
|
* only when a module is unloaded which never happens for built-in modules.
|
|
* The check_sec_ref() function traverses all relocation records
|
|
* to find all references to a section that reference a section that will
|
|
* be discarded and warns about it.
|
|
**/
|
|
static void check_sec_ref(struct module *mod, const char *modname,
|
|
struct elf_info *elf)
|
|
{
|
|
int i;
|
|
Elf_Shdr *sechdrs = elf->sechdrs;
|
|
|
|
/* Walk through all sections */
|
|
for (i = 0; i < elf->num_sections; i++) {
|
|
check_section(modname, elf, &elf->sechdrs[i]);
|
|
/* We want to process only relocation sections and not .init */
|
|
if (sechdrs[i].sh_type == SHT_RELA)
|
|
section_rela(modname, elf, &elf->sechdrs[i]);
|
|
else if (sechdrs[i].sh_type == SHT_REL)
|
|
section_rel(modname, elf, &elf->sechdrs[i]);
|
|
}
|
|
}
|
|
|
|
static char *remove_dot(char *s)
|
|
{
|
|
size_t n = strcspn(s, ".");
|
|
|
|
if (n && s[n]) {
|
|
size_t m = strspn(s + n + 1, "0123456789");
|
|
if (m && (s[n + m] == '.' || s[n + m] == 0))
|
|
s[n] = 0;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
static void read_symbols(char *modname)
|
|
{
|
|
const char *symname;
|
|
char *version;
|
|
char *license;
|
|
struct module *mod;
|
|
struct elf_info info = { };
|
|
Elf_Sym *sym;
|
|
|
|
if (!parse_elf(&info, modname))
|
|
return;
|
|
|
|
mod = new_module(modname);
|
|
|
|
/* When there's no vmlinux, don't print warnings about
|
|
* unresolved symbols (since there'll be too many ;) */
|
|
if (is_vmlinux(modname)) {
|
|
have_vmlinux = 1;
|
|
mod->skip = 1;
|
|
}
|
|
|
|
license = get_modinfo(info.modinfo, info.modinfo_len, "license");
|
|
if (info.modinfo && !license && !is_vmlinux(modname))
|
|
warn("modpost: missing MODULE_LICENSE() in %s\n"
|
|
"see include/linux/module.h for "
|
|
"more information\n", modname);
|
|
while (license) {
|
|
if (license_is_gpl_compatible(license))
|
|
mod->gpl_compatible = 1;
|
|
else {
|
|
mod->gpl_compatible = 0;
|
|
break;
|
|
}
|
|
license = get_next_modinfo(info.modinfo, info.modinfo_len,
|
|
"license", license);
|
|
}
|
|
|
|
for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
|
|
symname = remove_dot(info.strtab + sym->st_name);
|
|
|
|
handle_modversions(mod, &info, sym, symname);
|
|
handle_moddevtable(mod, &info, sym, symname);
|
|
}
|
|
if (!is_vmlinux(modname) ||
|
|
(is_vmlinux(modname) && vmlinux_section_warnings))
|
|
check_sec_ref(mod, modname, &info);
|
|
|
|
version = get_modinfo(info.modinfo, info.modinfo_len, "version");
|
|
if (version)
|
|
maybe_frob_rcs_version(modname, version, info.modinfo,
|
|
version - (char *)info.hdr);
|
|
if (version || (all_versions && !is_vmlinux(modname)))
|
|
get_src_version(modname, mod->srcversion,
|
|
sizeof(mod->srcversion)-1);
|
|
|
|
parse_elf_finish(&info);
|
|
|
|
/* Our trick to get versioning for module struct etc. - it's
|
|
* never passed as an argument to an exported function, so
|
|
* the automatic versioning doesn't pick it up, but it's really
|
|
* important anyhow */
|
|
if (modversions)
|
|
mod->unres = alloc_symbol("module_layout", 0, mod->unres);
|
|
}
|
|
|
|
static void read_symbols_from_files(const char *filename)
|
|
{
|
|
FILE *in = stdin;
|
|
char fname[PATH_MAX];
|
|
|
|
if (strcmp(filename, "-") != 0) {
|
|
in = fopen(filename, "r");
|
|
if (!in)
|
|
fatal("Can't open filenames file %s: %m", filename);
|
|
}
|
|
|
|
while (fgets(fname, PATH_MAX, in) != NULL) {
|
|
if (strends(fname, "\n"))
|
|
fname[strlen(fname)-1] = '\0';
|
|
read_symbols(fname);
|
|
}
|
|
|
|
if (in != stdin)
|
|
fclose(in);
|
|
}
|
|
|
|
#define SZ 500
|
|
|
|
/* We first write the generated file into memory using the
|
|
* following helper, then compare to the file on disk and
|
|
* only update the later if anything changed */
|
|
|
|
void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
|
|
const char *fmt, ...)
|
|
{
|
|
char tmp[SZ];
|
|
int len;
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
len = vsnprintf(tmp, SZ, fmt, ap);
|
|
buf_write(buf, tmp, len);
|
|
va_end(ap);
|
|
}
|
|
|
|
void buf_write(struct buffer *buf, const char *s, int len)
|
|
{
|
|
if (buf->size - buf->pos < len) {
|
|
buf->size += len + SZ;
|
|
buf->p = realloc(buf->p, buf->size);
|
|
}
|
|
strncpy(buf->p + buf->pos, s, len);
|
|
buf->pos += len;
|
|
}
|
|
|
|
static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
|
|
{
|
|
const char *e = is_vmlinux(m) ?"":".ko";
|
|
|
|
switch (exp) {
|
|
case export_gpl:
|
|
fatal("modpost: GPL-incompatible module %s%s "
|
|
"uses GPL-only symbol '%s'\n", m, e, s);
|
|
break;
|
|
case export_unused_gpl:
|
|
fatal("modpost: GPL-incompatible module %s%s "
|
|
"uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
|
|
break;
|
|
case export_gpl_future:
|
|
warn("modpost: GPL-incompatible module %s%s "
|
|
"uses future GPL-only symbol '%s'\n", m, e, s);
|
|
break;
|
|
case export_plain:
|
|
case export_unused:
|
|
case export_unknown:
|
|
/* ignore */
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void check_for_unused(enum export exp, const char *m, const char *s)
|
|
{
|
|
const char *e = is_vmlinux(m) ?"":".ko";
|
|
|
|
switch (exp) {
|
|
case export_unused:
|
|
case export_unused_gpl:
|
|
warn("modpost: module %s%s "
|
|
"uses symbol '%s' marked UNUSED\n", m, e, s);
|
|
break;
|
|
default:
|
|
/* ignore */
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void check_exports(struct module *mod)
|
|
{
|
|
struct symbol *s, *exp;
|
|
|
|
for (s = mod->unres; s; s = s->next) {
|
|
const char *basename;
|
|
exp = find_symbol(s->name);
|
|
if (!exp || exp->module == mod)
|
|
continue;
|
|
basename = strrchr(mod->name, '/');
|
|
if (basename)
|
|
basename++;
|
|
else
|
|
basename = mod->name;
|
|
if (!mod->gpl_compatible)
|
|
check_for_gpl_usage(exp->export, basename, exp->name);
|
|
check_for_unused(exp->export, basename, exp->name);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Header for the generated file
|
|
**/
|
|
static void add_header(struct buffer *b, struct module *mod)
|
|
{
|
|
buf_printf(b, "#include <linux/module.h>\n");
|
|
buf_printf(b, "#include <linux/vermagic.h>\n");
|
|
buf_printf(b, "#include <linux/compiler.h>\n");
|
|
buf_printf(b, "\n");
|
|
buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
|
|
buf_printf(b, "\n");
|
|
buf_printf(b, "__visible struct module __this_module\n");
|
|
buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n");
|
|
buf_printf(b, "\t.name = KBUILD_MODNAME,\n");
|
|
if (mod->has_init)
|
|
buf_printf(b, "\t.init = init_module,\n");
|
|
if (mod->has_cleanup)
|
|
buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
|
|
"\t.exit = cleanup_module,\n"
|
|
"#endif\n");
|
|
buf_printf(b, "\t.arch = MODULE_ARCH_INIT,\n");
|
|
buf_printf(b, "};\n");
|
|
}
|
|
|
|
static void add_intree_flag(struct buffer *b, int is_intree)
|
|
{
|
|
if (is_intree)
|
|
buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n");
|
|
}
|
|
|
|
static void add_staging_flag(struct buffer *b, const char *name)
|
|
{
|
|
static const char *staging_dir = "drivers/staging";
|
|
|
|
if (strncmp(staging_dir, name, strlen(staging_dir)) == 0)
|
|
buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
|
|
}
|
|
|
|
/* In kernel, this size is defined in linux/module.h;
|
|
* here we use Elf_Addr instead of long for covering cross-compile
|
|
*/
|
|
#define MODULE_NAME_LEN (64 - sizeof(Elf_Addr))
|
|
|
|
/**
|
|
* Record CRCs for unresolved symbols
|
|
**/
|
|
static int add_versions(struct buffer *b, struct module *mod)
|
|
{
|
|
struct symbol *s, *exp;
|
|
int err = 0;
|
|
|
|
for (s = mod->unres; s; s = s->next) {
|
|
exp = find_symbol(s->name);
|
|
if (!exp || exp->module == mod) {
|
|
if (have_vmlinux && !s->weak) {
|
|
if (warn_unresolved) {
|
|
warn("\"%s\" [%s.ko] undefined!\n",
|
|
s->name, mod->name);
|
|
} else {
|
|
merror("\"%s\" [%s.ko] undefined!\n",
|
|
s->name, mod->name);
|
|
err = 1;
|
|
}
|
|
}
|
|
continue;
|
|
}
|
|
s->module = exp->module;
|
|
s->crc_valid = exp->crc_valid;
|
|
s->crc = exp->crc;
|
|
}
|
|
|
|
if (!modversions)
|
|
return err;
|
|
|
|
buf_printf(b, "\n");
|
|
buf_printf(b, "static const struct modversion_info ____versions[]\n");
|
|
buf_printf(b, "__used\n");
|
|
buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
|
|
|
|
for (s = mod->unres; s; s = s->next) {
|
|
if (!s->module)
|
|
continue;
|
|
if (!s->crc_valid) {
|
|
warn("\"%s\" [%s.ko] has no CRC!\n",
|
|
s->name, mod->name);
|
|
continue;
|
|
}
|
|
if (strlen(s->name) >= MODULE_NAME_LEN) {
|
|
merror("too long symbol \"%s\" [%s.ko]\n",
|
|
s->name, mod->name);
|
|
err = 1;
|
|
break;
|
|
}
|
|
buf_printf(b, "\t{ %#8x, __VMLINUX_SYMBOL_STR(%s) },\n",
|
|
s->crc, s->name);
|
|
}
|
|
|
|
buf_printf(b, "};\n");
|
|
|
|
return err;
|
|
}
|
|
|
|
static void add_depends(struct buffer *b, struct module *mod,
|
|
struct module *modules)
|
|
{
|
|
struct symbol *s;
|
|
struct module *m;
|
|
int first = 1;
|
|
|
|
for (m = modules; m; m = m->next)
|
|
m->seen = is_vmlinux(m->name);
|
|
|
|
buf_printf(b, "\n");
|
|
buf_printf(b, "static const char __module_depends[]\n");
|
|
buf_printf(b, "__used\n");
|
|
buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
|
|
buf_printf(b, "\"depends=");
|
|
for (s = mod->unres; s; s = s->next) {
|
|
const char *p;
|
|
if (!s->module)
|
|
continue;
|
|
|
|
if (s->module->seen)
|
|
continue;
|
|
|
|
s->module->seen = 1;
|
|
p = strrchr(s->module->name, '/');
|
|
if (p)
|
|
p++;
|
|
else
|
|
p = s->module->name;
|
|
buf_printf(b, "%s%s", first ? "" : ",", p);
|
|
first = 0;
|
|
}
|
|
buf_printf(b, "\";\n");
|
|
}
|
|
|
|
static void add_srcversion(struct buffer *b, struct module *mod)
|
|
{
|
|
if (mod->srcversion[0]) {
|
|
buf_printf(b, "\n");
|
|
buf_printf(b, "MODULE_INFO(srcversion, \"%s\");\n",
|
|
mod->srcversion);
|
|
}
|
|
}
|
|
|
|
static void write_if_changed(struct buffer *b, const char *fname)
|
|
{
|
|
char *tmp;
|
|
FILE *file;
|
|
struct stat st;
|
|
|
|
file = fopen(fname, "r");
|
|
if (!file)
|
|
goto write;
|
|
|
|
if (fstat(fileno(file), &st) < 0)
|
|
goto close_write;
|
|
|
|
if (st.st_size != b->pos)
|
|
goto close_write;
|
|
|
|
tmp = NOFAIL(malloc(b->pos));
|
|
if (fread(tmp, 1, b->pos, file) != b->pos)
|
|
goto free_write;
|
|
|
|
if (memcmp(tmp, b->p, b->pos) != 0)
|
|
goto free_write;
|
|
|
|
free(tmp);
|
|
fclose(file);
|
|
return;
|
|
|
|
free_write:
|
|
free(tmp);
|
|
close_write:
|
|
fclose(file);
|
|
write:
|
|
file = fopen(fname, "w");
|
|
if (!file) {
|
|
perror(fname);
|
|
exit(1);
|
|
}
|
|
if (fwrite(b->p, 1, b->pos, file) != b->pos) {
|
|
perror(fname);
|
|
exit(1);
|
|
}
|
|
fclose(file);
|
|
}
|
|
|
|
/* parse Module.symvers file. line format:
|
|
* 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
|
|
**/
|
|
static void read_dump(const char *fname, unsigned int kernel)
|
|
{
|
|
unsigned long size, pos = 0;
|
|
void *file = grab_file(fname, &size);
|
|
char *line;
|
|
|
|
if (!file)
|
|
/* No symbol versions, silently ignore */
|
|
return;
|
|
|
|
while ((line = get_next_line(&pos, file, size))) {
|
|
char *symname, *modname, *d, *export, *end;
|
|
unsigned int crc;
|
|
struct module *mod;
|
|
struct symbol *s;
|
|
|
|
if (!(symname = strchr(line, '\t')))
|
|
goto fail;
|
|
*symname++ = '\0';
|
|
if (!(modname = strchr(symname, '\t')))
|
|
goto fail;
|
|
*modname++ = '\0';
|
|
if ((export = strchr(modname, '\t')) != NULL)
|
|
*export++ = '\0';
|
|
if (export && ((end = strchr(export, '\t')) != NULL))
|
|
*end = '\0';
|
|
crc = strtoul(line, &d, 16);
|
|
if (*symname == '\0' || *modname == '\0' || *d != '\0')
|
|
goto fail;
|
|
mod = find_module(modname);
|
|
if (!mod) {
|
|
if (is_vmlinux(modname))
|
|
have_vmlinux = 1;
|
|
mod = new_module(modname);
|
|
mod->skip = 1;
|
|
}
|
|
s = sym_add_exported(symname, mod, export_no(export));
|
|
s->kernel = kernel;
|
|
s->preloaded = 1;
|
|
sym_update_crc(symname, mod, crc, export_no(export));
|
|
}
|
|
release_file(file, size);
|
|
return;
|
|
fail:
|
|
release_file(file, size);
|
|
fatal("parse error in symbol dump file\n");
|
|
}
|
|
|
|
/* For normal builds always dump all symbols.
|
|
* For external modules only dump symbols
|
|
* that are not read from kernel Module.symvers.
|
|
**/
|
|
static int dump_sym(struct symbol *sym)
|
|
{
|
|
if (!external_module)
|
|
return 1;
|
|
if (sym->vmlinux || sym->kernel)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static void write_dump(const char *fname)
|
|
{
|
|
struct buffer buf = { };
|
|
struct symbol *symbol;
|
|
int n;
|
|
|
|
for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
|
|
symbol = symbolhash[n];
|
|
while (symbol) {
|
|
if (dump_sym(symbol))
|
|
buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
|
|
symbol->crc, symbol->name,
|
|
symbol->module->name,
|
|
export_str(symbol->export));
|
|
symbol = symbol->next;
|
|
}
|
|
}
|
|
write_if_changed(&buf, fname);
|
|
free(buf.p);
|
|
}
|
|
|
|
struct ext_sym_list {
|
|
struct ext_sym_list *next;
|
|
const char *file;
|
|
};
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
struct module *mod;
|
|
struct buffer buf = { };
|
|
char *kernel_read = NULL, *module_read = NULL;
|
|
char *dump_write = NULL, *files_source = NULL;
|
|
int opt;
|
|
int err;
|
|
struct ext_sym_list *extsym_iter;
|
|
struct ext_sym_list *extsym_start = NULL;
|
|
|
|
while ((opt = getopt(argc, argv, "i:I:e:mnsST:o:awM:K:E")) != -1) {
|
|
switch (opt) {
|
|
case 'i':
|
|
kernel_read = optarg;
|
|
break;
|
|
case 'I':
|
|
module_read = optarg;
|
|
external_module = 1;
|
|
break;
|
|
case 'e':
|
|
external_module = 1;
|
|
extsym_iter =
|
|
NOFAIL(malloc(sizeof(*extsym_iter)));
|
|
extsym_iter->next = extsym_start;
|
|
extsym_iter->file = optarg;
|
|
extsym_start = extsym_iter;
|
|
break;
|
|
case 'm':
|
|
modversions = 1;
|
|
break;
|
|
case 'n':
|
|
ignore_missing_files = 1;
|
|
break;
|
|
case 'o':
|
|
dump_write = optarg;
|
|
break;
|
|
case 'a':
|
|
all_versions = 1;
|
|
break;
|
|
case 's':
|
|
vmlinux_section_warnings = 0;
|
|
break;
|
|
case 'S':
|
|
sec_mismatch_verbose = 0;
|
|
break;
|
|
case 'T':
|
|
files_source = optarg;
|
|
break;
|
|
case 'w':
|
|
warn_unresolved = 1;
|
|
break;
|
|
case 'E':
|
|
sec_mismatch_fatal = 1;
|
|
break;
|
|
default:
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
if (kernel_read)
|
|
read_dump(kernel_read, 1);
|
|
if (module_read)
|
|
read_dump(module_read, 0);
|
|
while (extsym_start) {
|
|
read_dump(extsym_start->file, 0);
|
|
extsym_iter = extsym_start->next;
|
|
free(extsym_start);
|
|
extsym_start = extsym_iter;
|
|
}
|
|
|
|
while (optind < argc)
|
|
read_symbols(argv[optind++]);
|
|
|
|
if (files_source)
|
|
read_symbols_from_files(files_source);
|
|
|
|
for (mod = modules; mod; mod = mod->next) {
|
|
if (mod->skip)
|
|
continue;
|
|
check_exports(mod);
|
|
}
|
|
|
|
err = 0;
|
|
|
|
for (mod = modules; mod; mod = mod->next) {
|
|
char fname[PATH_MAX];
|
|
|
|
if (mod->skip)
|
|
continue;
|
|
|
|
buf.pos = 0;
|
|
|
|
add_header(&buf, mod);
|
|
add_intree_flag(&buf, !external_module);
|
|
add_staging_flag(&buf, mod->name);
|
|
err |= add_versions(&buf, mod);
|
|
add_depends(&buf, mod, modules);
|
|
add_moddevtable(&buf, mod);
|
|
add_srcversion(&buf, mod);
|
|
|
|
sprintf(fname, "%s.mod.c", mod->name);
|
|
write_if_changed(&buf, fname);
|
|
}
|
|
if (dump_write)
|
|
write_dump(dump_write);
|
|
if (sec_mismatch_count) {
|
|
if (!sec_mismatch_verbose) {
|
|
warn("modpost: Found %d section mismatch(es).\n"
|
|
"To see full details build your kernel with:\n"
|
|
"'make CONFIG_DEBUG_SECTION_MISMATCH=y'\n",
|
|
sec_mismatch_count);
|
|
}
|
|
if (sec_mismatch_fatal) {
|
|
fatal("modpost: Section mismatches detected.\n"
|
|
"Set CONFIG_SECTION_MISMATCH_WARN_ONLY=y to allow them.\n");
|
|
}
|
|
}
|
|
free(buf.p);
|
|
|
|
return err;
|
|
}
|