forked from Minki/linux
[PARISC] Arch-specific compat signals
Add enough arch-specific compat signals code to enable parisc64 to compile and boot out of the mainline tree. There are likely still many dragons here, but this is a start to squashing the last big difference between the mainline tree and the parisc-linux tree. The remaining bugs can be squashed as they come up. Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
This commit is contained in:
Kyle McMartin
Kyle McMartin
parent
16541c8745
commit
f671c45df2
@ -91,7 +91,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
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int copied;
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#ifdef __LP64__
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if (is_compat_task(child)) {
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if (personality(child->personality) == PER_LINUX32) {
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unsigned int tmp;
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addr &= 0xffffffffL;
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@ -123,7 +123,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
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case PTRACE_POKEDATA:
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ret = 0;
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#ifdef __LP64__
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if (is_compat_task(child)) {
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if (personality(child->personality) == PER_LINUX32) {
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unsigned int tmp = (unsigned int)data;
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DBG("sys_ptrace(POKE%s, %d, %lx, %lx)\n",
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request == PTRACE_POKETEXT ? "TEXT" : "DATA",
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@ -146,7 +146,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
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case PTRACE_PEEKUSR: {
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ret = -EIO;
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#ifdef __LP64__
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if (is_compat_task(child)) {
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if (personality(child->personality) == PER_LINUX32) {
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unsigned int tmp;
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if (addr & (sizeof(int)-1))
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@ -205,7 +205,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
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goto out_tsk;
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}
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#ifdef __LP64__
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if (is_compat_task(child)) {
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if (personality(child->personality) == PER_LINUX32) {
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if (addr & (sizeof(int)-1))
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goto out_tsk;
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if ((addr = translate_usr_offset(addr)) < 0)
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@ -317,7 +317,7 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
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if(personality(current->personality) == PER_LINUX32) {
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DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &compat_frame->info);
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err |= compat_copy_siginfo_to_user(&compat_frame->info, info);
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err |= copy_siginfo_to_user32(&compat_frame->info, info);
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DBG(1,"SETUP_RT_FRAME: 1\n");
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compat_val = (compat_int_t)current->sas_ss_sp;
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err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_sp);
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@ -31,7 +31,6 @@
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <asm/compat_signal.h>
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#include <asm/uaccess.h>
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#include "signal32.h"
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@ -398,3 +397,104 @@ setup_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __
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return err;
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}
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int
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copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from)
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{
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unsigned long tmp;
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int err;
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if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t)))
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return -EFAULT;
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err = __get_user(to->si_signo, &from->si_signo);
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err |= __get_user(to->si_errno, &from->si_errno);
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err |= __get_user(to->si_code, &from->si_code);
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if (to->si_code < 0)
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err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
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else {
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switch (to->si_code >> 16) {
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case __SI_CHLD >> 16:
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err |= __get_user(to->si_utime, &from->si_utime);
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err |= __get_user(to->si_stime, &from->si_stime);
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err |= __get_user(to->si_status, &from->si_status);
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default:
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err |= __get_user(to->si_pid, &from->si_pid);
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err |= __get_user(to->si_uid, &from->si_uid);
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break;
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case __SI_FAULT >> 16:
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err |= __get_user(tmp, &from->si_addr);
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to->si_addr = (void __user *) tmp;
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break;
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case __SI_POLL >> 16:
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err |= __get_user(to->si_band, &from->si_band);
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err |= __get_user(to->si_fd, &from->si_fd);
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break;
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case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
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case __SI_MESGQ >> 16:
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err |= __get_user(to->si_pid, &from->si_pid);
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err |= __get_user(to->si_uid, &from->si_uid);
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err |= __get_user(to->si_int, &from->si_int);
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break;
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}
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}
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return err;
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}
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int
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copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from)
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{
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unsigned int addr;
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int err;
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if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
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return -EFAULT;
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/* If you change siginfo_t structure, please be sure
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this code is fixed accordingly.
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It should never copy any pad contained in the structure
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to avoid security leaks, but must copy the generic
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3 ints plus the relevant union member.
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This routine must convert siginfo from 64bit to 32bit as well
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at the same time. */
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err = __put_user(from->si_signo, &to->si_signo);
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err |= __put_user(from->si_errno, &to->si_errno);
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err |= __put_user((short)from->si_code, &to->si_code);
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if (from->si_code < 0)
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err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
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else {
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switch (from->si_code >> 16) {
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case __SI_CHLD >> 16:
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err |= __put_user(from->si_utime, &to->si_utime);
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err |= __put_user(from->si_stime, &to->si_stime);
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err |= __put_user(from->si_status, &to->si_status);
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default:
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err |= __put_user(from->si_pid, &to->si_pid);
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err |= __put_user(from->si_uid, &to->si_uid);
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break;
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case __SI_FAULT >> 16:
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/* avoid type-checking warnings by copying _pad[0] in lieu of si_addr... */
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err |= __put_user(from->_sifields._pad[0], &to->si_addr);
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break;
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case __SI_POLL >> 16:
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err |= __put_user(from->si_band, &to->si_band);
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err |= __put_user(from->si_fd, &to->si_fd);
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break;
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case __SI_TIMER >> 16:
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err |= __put_user(from->si_tid, &to->si_tid);
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err |= __put_user(from->si_overrun, &to->si_overrun);
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addr = (unsigned long) from->si_ptr;
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err |= __put_user(addr, &to->si_ptr);
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break;
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case __SI_RT >> 16: /* Not generated by the kernel as of now. */
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case __SI_MESGQ >> 16:
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err |= __put_user(from->si_uid, &to->si_uid);
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err |= __put_user(from->si_pid, &to->si_pid);
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addr = (unsigned long) from->si_ptr;
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err |= __put_user(addr, &to->si_ptr);
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break;
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}
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}
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return err;
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}
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@ -20,8 +20,34 @@
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#define _PARISC64_KERNEL_SIGNAL32_H
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#include <linux/compat.h>
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#include <asm/compat_signal.h>
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#include <asm/compat_rt_sigframe.h>
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typedef compat_uptr_t compat_sighandler_t;
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typedef struct compat_sigaltstack {
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compat_uptr_t ss_sp;
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compat_int_t ss_flags;
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compat_size_t ss_size;
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} compat_stack_t;
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/* Most things should be clean enough to redefine this at will, if care
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is taken to make libc match. */
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struct compat_sigaction {
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compat_sighandler_t sa_handler;
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compat_uint_t sa_flags;
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compat_sigset_t sa_mask; /* mask last for extensibility */
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};
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/* 32-bit ucontext as seen from an 64-bit kernel */
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struct compat_ucontext {
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compat_uint_t uc_flags;
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compat_uptr_t uc_link;
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compat_stack_t uc_stack; /* struct compat_sigaltstack (12 bytes)*/
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/* FIXME: Pad out to get uc_mcontext to start at an 8-byte aligned boundary */
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compat_uint_t pad[1];
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struct compat_sigcontext uc_mcontext;
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compat_sigset_t uc_sigmask; /* mask last for extensibility */
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};
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/* ELF32 signal handling */
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@ -29,6 +55,103 @@ struct k_sigaction32 {
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struct compat_sigaction sa;
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};
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typedef struct compat_siginfo {
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int si_signo;
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int si_errno;
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int si_code;
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union {
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int _pad[((128/sizeof(int)) - 3)];
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/* kill() */
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struct {
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unsigned int _pid; /* sender's pid */
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unsigned int _uid; /* sender's uid */
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} _kill;
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/* POSIX.1b timers */
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struct {
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compat_timer_t _tid; /* timer id */
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int _overrun; /* overrun count */
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char _pad[sizeof(unsigned int) - sizeof(int)];
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compat_sigval_t _sigval; /* same as below */
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int _sys_private; /* not to be passed to user */
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} _timer;
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/* POSIX.1b signals */
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struct {
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unsigned int _pid; /* sender's pid */
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unsigned int _uid; /* sender's uid */
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compat_sigval_t _sigval;
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} _rt;
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/* SIGCHLD */
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struct {
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unsigned int _pid; /* which child */
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unsigned int _uid; /* sender's uid */
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int _status; /* exit code */
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compat_clock_t _utime;
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compat_clock_t _stime;
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} _sigchld;
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/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
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struct {
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unsigned int _addr; /* faulting insn/memory ref. */
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} _sigfault;
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/* SIGPOLL */
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struct {
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int _band; /* POLL_IN, POLL_OUT, POLL_MSG */
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int _fd;
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} _sigpoll;
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} _sifields;
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} compat_siginfo_t;
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int copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from);
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int copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from);
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/* In a deft move of uber-hackery, we decide to carry the top half of all
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* 64-bit registers in a non-portable, non-ABI, hidden structure.
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* Userspace can read the hidden structure if it *wants* but is never
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* guaranteed to be in the same place. Infact the uc_sigmask from the
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* ucontext_t structure may push the hidden register file downards
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*/
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struct compat_regfile {
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/* Upper half of all the 64-bit registers that were truncated
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on a copy to a 32-bit userspace */
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compat_int_t rf_gr[32];
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compat_int_t rf_iasq[2];
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compat_int_t rf_iaoq[2];
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compat_int_t rf_sar;
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};
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#define COMPAT_SIGRETURN_TRAMP 4
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#define COMPAT_SIGRESTARTBLOCK_TRAMP 5
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#define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + \
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COMPAT_SIGRESTARTBLOCK_TRAMP)
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struct compat_rt_sigframe {
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/* XXX: Must match trampoline size in arch/parisc/kernel/signal.c
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Secondary to that it must protect the ERESTART_RESTARTBLOCK
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trampoline we left on the stack (we were bad and didn't
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change sp so we could run really fast.) */
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compat_uint_t tramp[COMPAT_TRAMP_SIZE];
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compat_siginfo_t info;
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struct compat_ucontext uc;
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/* Hidden location of truncated registers, *must* be last. */
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struct compat_regfile regs;
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};
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/*
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* The 32-bit ABI wants at least 48 bytes for a function call frame:
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* 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of
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* which Linux/parisc uses is sp-20 for the saved return pointer...)
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* Then, the stack pointer must be rounded to a cache line (64 bytes).
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*/
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#define SIGFRAME32 64
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#define FUNCTIONCALLFRAME32 48
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#define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32)
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void sigset_32to64(sigset_t *s64, compat_sigset_t *s32);
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void sigset_64to32(compat_sigset_t *s32, sigset_t *s64);
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int do_sigaltstack32 (const compat_stack_t __user *uss32,
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@ -1,8 +1,7 @@
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#ifndef _ASM_PARISC_COMPAT_UCONTEXT_H
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#define _ASM_PARISC_COMPAT_UCONTEXT_H
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#include<linux/compat.h>
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#include<asm/compat_signal.h>
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#include <linux/compat.h>
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/* 32-bit ucontext as seen from an 64-bit kernel */
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struct compat_ucontext {
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@ -1,10 +1,6 @@
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#ifndef _ASM_PARISC_RT_SIGFRAME_H
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#define _ASM_PARISC_RT_SIGFRAME_H
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#ifdef CONFIG_COMPAT
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#include <asm/compat_rt_sigframe.h>
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#endif
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#define SIGRETURN_TRAMP 4
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#define SIGRESTARTBLOCK_TRAMP 5
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#define TRAMP_SIZE (SIGRETURN_TRAMP + SIGRESTARTBLOCK_TRAMP)
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