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Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

Browse Source 
* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86/i386: Put aligned stack-canary in percpu shared_aligned section
  x86/i386: Make sure stack-protector segment base is cache aligned
  x86: Detect stack protector for i386 builds on x86_64
  x86: allow "=rm" in native_save_fl()
  x86: properly annotate alternatives.c
  x86: Introduce GDT_ENTRY_INIT(), initialize bad_bios_desc statically
  x86, 32-bit: Use generic sys_pipe()
  x86: Introduce GDT_ENTRY_INIT(), fix APM
  x86: Introduce GDT_ENTRY_INIT()
  x86: Introduce set_desc_base() and set_desc_limit()
  x86: Remove unused patch_espfix_desc()
  x86: Use get_desc_base()
This commit is contained in:
Linus Torvalds 2009-09-14 07:53:49 -07:00
commit b581af5110
23 changed files with 150 additions and 175 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/Makefile
View File

@ -72,7 +72,7 @@ endif
ifdef CONFIG_CC_STACKPROTECTOR
cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC)),y)
ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(biarch)),y)
stackp-y := -fstack-protector
stackp-$(CONFIG_CC_STACKPROTECTOR_ALL) += -fstack-protector-all
KBUILD_CFLAGS += $(stackp-y)

2
arch/x86/ia32/ia32entry.S
View File

@ -537,7 +537,7 @@ ia32_sys_call_table:
.quad sys_mkdir
.quad sys_rmdir /* 40 */
.quad sys_dup
.quad sys32_pipe
.quad sys_pipe
.quad compat_sys_times
.quad quiet_ni_syscall /* old prof syscall holder */
.quad sys_brk /* 45 */

14
arch/x86/ia32/sys_ia32.c
View File

@ -189,20 +189,6 @@ asmlinkage long sys32_mprotect(unsigned long start, size_t len,
return sys_mprotect(start, len, prot);
}
asmlinkage long sys32_pipe(int __user *fd)
{
int retval;
int fds[2];
retval = do_pipe_flags(fds, 0);
if (retval)
goto out;
if (copy_to_user(fd, fds, sizeof(fds)))
retval = -EFAULT;
out:
return retval;
}
asmlinkage long sys32_rt_sigaction(int sig, struct sigaction32 __user *act,
struct sigaction32 __user *oact,
unsigned int sigsetsize)

7
arch/x86/include/asm/alternative.h
View File

@ -73,8 +73,6 @@ static inline void alternatives_smp_module_del(struct module *mod) {}
static inline void alternatives_smp_switch(int smp) {}
#endif /* CONFIG_SMP */
const unsigned char *const *find_nop_table(void);
/* alternative assembly primitive: */
#define ALTERNATIVE(oldinstr, newinstr, feature) \
\
@ -144,8 +142,6 @@ static inline void apply_paravirt(struct paravirt_patch_site *start,
#define __parainstructions_end NULL
#endif
extern void add_nops(void *insns, unsigned int len);
/*
* Clear and restore the kernel write-protection flag on the local CPU.
* Allows the kernel to edit read-only pages.
@ -161,10 +157,7 @@ extern void add_nops(void *insns, unsigned int len);
* Intel's errata.
* On the local CPU you need to be protected again NMI or MCE handlers seeing an
* inconsistent instruction while you patch.
* The _early version expects the memory to already be RW.
*/
extern void *text_poke(void *addr, const void *opcode, size_t len);
extern void *text_poke_early(void *addr, const void *opcode, size_t len);
#endif /* _ASM_X86_ALTERNATIVE_H */

13
arch/x86/include/asm/desc.h
View File

@ -291,11 +291,24 @@ static inline unsigned long get_desc_base(const struct desc_struct *desc)
return desc->base0 | ((desc->base1) << 16) | ((desc->base2) << 24);
}
static inline void set_desc_base(struct desc_struct *desc, unsigned long base)
{
desc->base0 = base & 0xffff;
desc->base1 = (base >> 16) & 0xff;
desc->base2 = (base >> 24) & 0xff;
}
static inline unsigned long get_desc_limit(const struct desc_struct *desc)
{
return desc->limit0 | (desc->limit << 16);
}
static inline void set_desc_limit(struct desc_struct *desc, unsigned long limit)
{
desc->limit0 = limit & 0xffff;
desc->limit = (limit >> 16) & 0xf;
}
static inline void _set_gate(int gate, unsigned type, void *addr,
unsigned dpl, unsigned ist, unsigned seg)
{

6
arch/x86/include/asm/desc_defs.h
View File

@ -34,6 +34,12 @@ struct desc_struct {
};
} __attribute__((packed));
#define GDT_ENTRY_INIT(flags, base, limit) { { { \
.a = ((limit) & 0xffff) | (((base) & 0xffff) << 16), \
.b = (((base) & 0xff0000) >> 16) | (((flags) & 0xf0ff) << 8) | \
((limit) & 0xf0000) | ((base) & 0xff000000), \
} } }
enum {
GATE_INTERRUPT = 0xE,
GATE_TRAP = 0xF,

9
arch/x86/include/asm/irqflags.h
View File

@ -13,14 +13,13 @@ static inline unsigned long native_save_fl(void)
unsigned long flags;
/*
* Note: this needs to be "=r" not "=rm", because we have the
* stack offset from what gcc expects at the time the "pop" is
* executed, and so a memory reference with respect to the stack
* would end up using the wrong address.
* "=rm" is safe here, because "pop" adjusts the stack before
* it evaluates its effective address -- this is part of the
* documented behavior of the "pop" instruction.
*/
asm volatile("# __raw_save_flags\n\t"
"pushf ; pop %0"
: "=r" (flags)
: "=rm" (flags)
: /* no input */
: "memory");

5
arch/x86/include/asm/lguest.h
View File

@ -90,8 +90,9 @@ static inline void lguest_set_ts(void)
}
/* Full 4G segment descriptors, suitable for CS and DS. */
#define FULL_EXEC_SEGMENT ((struct desc_struct){ { {0x0000ffff, 0x00cf9b00} } })
#define FULL_SEGMENT ((struct desc_struct){ { {0x0000ffff, 0x00cf9300} } })
#define FULL_EXEC_SEGMENT \
((struct desc_struct)GDT_ENTRY_INIT(0xc09b, 0, 0xfffff))
#define FULL_SEGMENT ((struct desc_struct)GDT_ENTRY_INIT(0xc093, 0, 0xfffff))
#endif /* __ASSEMBLY__ */

12
arch/x86/include/asm/processor.h
View File

@ -403,7 +403,17 @@ extern unsigned long kernel_eflags;
extern asmlinkage void ignore_sysret(void);
#else /* X86_64 */
#ifdef CONFIG_CC_STACKPROTECTOR
DECLARE_PER_CPU(unsigned long, stack_canary);
/*
* Make sure stack canary segment base is cached-aligned:
* "For Intel Atom processors, avoid non zero segment base address
* that is not aligned to cache line boundary at all cost."
* (Optim Ref Manual Assembly/Compiler Coding Rule 15.)
*/
struct stack_canary {
char __pad[20]; /* canary at %gs:20 */
unsigned long canary;
};
DECLARE_PER_CPU_ALIGNED(struct stack_canary, stack_canary);
#endif
#endif /* X86_64 */

10
arch/x86/include/asm/stackprotector.h
View File

@ -48,7 +48,7 @@
* head_32 for boot CPU and setup_per_cpu_areas() for others.
*/
#define GDT_STACK_CANARY_INIT \
[GDT_ENTRY_STACK_CANARY] = { { { 0x00000018, 0x00409000 } } },
[GDT_ENTRY_STACK_CANARY] = GDT_ENTRY_INIT(0x4090, 0, 0x18),
/*
* Initialize the stackprotector canary value.
@ -78,21 +78,19 @@ static __always_inline void boot_init_stack_canary(void)
#ifdef CONFIG_X86_64
percpu_write(irq_stack_union.stack_canary, canary);
#else
percpu_write(stack_canary, canary);
percpu_write(stack_canary.canary, canary);
#endif
}
static inline void setup_stack_canary_segment(int cpu)
{
#ifdef CONFIG_X86_32
unsigned long canary = (unsigned long)&per_cpu(stack_canary, cpu) - 20;
unsigned long canary = (unsigned long)&per_cpu(stack_canary, cpu);
struct desc_struct *gdt_table = get_cpu_gdt_table(cpu);
struct desc_struct desc;
desc = gdt_table[GDT_ENTRY_STACK_CANARY];
desc.base0 = canary & 0xffff;
desc.base1 = (canary >> 16) & 0xff;
desc.base2 = (canary >> 24) & 0xff;
set_desc_base(&desc, canary);
write_gdt_entry(gdt_table, GDT_ENTRY_STACK_CANARY, &desc, DESCTYPE_S);
#endif
}

29
arch/x86/include/asm/system.h
View File

@ -31,7 +31,7 @@ void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p,
"movl %P[task_canary](%[next]), %%ebx\n\t" \
"movl %%ebx, "__percpu_arg([stack_canary])"\n\t"
#define __switch_canary_oparam \
, [stack_canary] "=m" (per_cpu_var(stack_canary))
, [stack_canary] "=m" (per_cpu_var(stack_canary.canary))
#define __switch_canary_iparam \
, [task_canary] "i" (offsetof(struct task_struct, stack_canary))
#else /* CC_STACKPROTECTOR */
@ -150,33 +150,6 @@ do { \
#endif
#ifdef __KERNEL__
#define _set_base(addr, base) do { unsigned long __pr; \
__asm__ __volatile__ ("movw %%dx,%1\n\t" \
"rorl $16,%%edx\n\t" \
"movb %%dl,%2\n\t" \
"movb %%dh,%3" \
:"=&d" (__pr) \
:"m" (*((addr)+2)), \
"m" (*((addr)+4)), \
"m" (*((addr)+7)), \
"0" (base) \
); } while (0)
#define _set_limit(addr, limit) do { unsigned long __lr; \
__asm__ __volatile__ ("movw %%dx,%1\n\t" \
"rorl $16,%%edx\n\t" \
"movb %2,%%dh\n\t" \
"andb $0xf0,%%dh\n\t" \
"orb %%dh,%%dl\n\t" \
"movb %%dl,%2" \
:"=&d" (__lr) \
:"m" (*(addr)), \
"m" (*((addr)+6)), \
"0" (limit) \
); } while (0)
#define set_base(ldt, base) _set_base(((char *)&(ldt)) , (base))
#define set_limit(ldt, limit) _set_limit(((char *)&(ldt)) , ((limit)-1))
extern void native_load_gs_index(unsigned);

4
arch/x86/include/asm/traps.h
View File

@ -81,9 +81,7 @@ extern int panic_on_unrecovered_nmi;
void math_error(void __user *);
void math_emulate(struct math_emu_info *);
#ifdef CONFIG_X86_32
unsigned long patch_espfix_desc(unsigned long, unsigned long);
#else
#ifndef CONFIG_X86_32
asmlinkage void smp_thermal_interrupt(void);
asmlinkage void mce_threshold_interrupt(void);
#endif

56
arch/x86/kernel/alternative.c
View File

@ -2,6 +2,7 @@
#include <linux/sched.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/stringify.h>
#include <linux/kprobes.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
@ -32,7 +33,7 @@ __setup("smp-alt-boot", bootonly);
#define smp_alt_once 1
#endif
static int debug_alternative;
static int __initdata_or_module debug_alternative;
static int __init debug_alt(char *str)
{
@ -51,7 +52,7 @@ static int __init setup_noreplace_smp(char *str)
__setup("noreplace-smp", setup_noreplace_smp);
#ifdef CONFIG_PARAVIRT
static int noreplace_paravirt = 0;
static int __initdata_or_module noreplace_paravirt = 0;
static int __init setup_noreplace_paravirt(char *str)
{
@ -64,16 +65,17 @@ __setup("noreplace-paravirt", setup_noreplace_paravirt);
#define DPRINTK(fmt, args...) if (debug_alternative) \
printk(KERN_DEBUG fmt, args)
#ifdef GENERIC_NOP1
#if defined(GENERIC_NOP1) && !defined(CONFIG_X86_64)
/* Use inline assembly to define this because the nops are defined
as inline assembly strings in the include files and we cannot
get them easily into strings. */
asm("\t.section .rodata, \"a\"\nintelnops: "
asm("\t" __stringify(__INITRODATA_OR_MODULE) "\nintelnops: "
GENERIC_NOP1 GENERIC_NOP2 GENERIC_NOP3 GENERIC_NOP4 GENERIC_NOP5 GENERIC_NOP6
GENERIC_NOP7 GENERIC_NOP8
"\t.previous");
extern const unsigned char intelnops[];
static const unsigned char *const intel_nops[ASM_NOP_MAX+1] = {
static const unsigned char *const __initconst_or_module
intel_nops[ASM_NOP_MAX+1] = {
NULL,
intelnops,
intelnops + 1,
@ -87,12 +89,13 @@ static const unsigned char *const intel_nops[ASM_NOP_MAX+1] = {
#endif
#ifdef K8_NOP1
asm("\t.section .rodata, \"a\"\nk8nops: "
asm("\t" __stringify(__INITRODATA_OR_MODULE) "\nk8nops: "
K8_NOP1 K8_NOP2 K8_NOP3 K8_NOP4 K8_NOP5 K8_NOP6
K8_NOP7 K8_NOP8
"\t.previous");
extern const unsigned char k8nops[];
static const unsigned char *const k8_nops[ASM_NOP_MAX+1] = {
static const unsigned char *const __initconst_or_module
k8_nops[ASM_NOP_MAX+1] = {
NULL,
k8nops,
k8nops + 1,
@ -105,13 +108,14 @@ static const unsigned char *const k8_nops[ASM_NOP_MAX+1] = {
};
#endif
#ifdef K7_NOP1
asm("\t.section .rodata, \"a\"\nk7nops: "
#if defined(K7_NOP1) && !defined(CONFIG_X86_64)
asm("\t" __stringify(__INITRODATA_OR_MODULE) "\nk7nops: "
K7_NOP1 K7_NOP2 K7_NOP3 K7_NOP4 K7_NOP5 K7_NOP6
K7_NOP7 K7_NOP8
"\t.previous");
extern const unsigned char k7nops[];
static const unsigned char *const k7_nops[ASM_NOP_MAX+1] = {
static const unsigned char *const __initconst_or_module
k7_nops[ASM_NOP_MAX+1] = {
NULL,
k7nops,
k7nops + 1,
@ -125,12 +129,13 @@ static const unsigned char *const k7_nops[ASM_NOP_MAX+1] = {
#endif
#ifdef P6_NOP1
asm("\t.section .rodata, \"a\"\np6nops: "
asm("\t" __stringify(__INITRODATA_OR_MODULE) "\np6nops: "
P6_NOP1 P6_NOP2 P6_NOP3 P6_NOP4 P6_NOP5 P6_NOP6
P6_NOP7 P6_NOP8
"\t.previous");
extern const unsigned char p6nops[];
static const unsigned char *const p6_nops[ASM_NOP_MAX+1] = {
static const unsigned char *const __initconst_or_module
p6_nops[ASM_NOP_MAX+1] = {
NULL,
p6nops,
p6nops + 1,
@ -146,7 +151,7 @@ static const unsigned char *const p6_nops[ASM_NOP_MAX+1] = {
#ifdef CONFIG_X86_64
extern char __vsyscall_0;
const unsigned char *const *find_nop_table(void)
static const unsigned char *const *__init_or_module find_nop_table(void)
{
if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
boot_cpu_has(X86_FEATURE_NOPL))
@ -157,7 +162,7 @@ const unsigned char *const *find_nop_table(void)
#else /* CONFIG_X86_64 */
const unsigned char *const *find_nop_table(void)
static const unsigned char *const *__init_or_module find_nop_table(void)
{
if (boot_cpu_has(X86_FEATURE_K8))
return k8_nops;
@ -172,7 +177,7 @@ const unsigned char *const *find_nop_table(void)
#endif /* CONFIG_X86_64 */
/* Use this to add nops to a buffer, then text_poke the whole buffer. */
void add_nops(void *insns, unsigned int len)
static void __init_or_module add_nops(void *insns, unsigned int len)
{
const unsigned char *const *noptable = find_nop_table();
@ -185,10 +190,10 @@ void add_nops(void *insns, unsigned int len)
len -= noplen;
}
}
EXPORT_SYMBOL_GPL(add_nops);
extern struct alt_instr __alt_instructions[], __alt_instructions_end[];
extern u8 *__smp_locks[], *__smp_locks_end[];
static void *text_poke_early(void *addr, const void *opcode, size_t len);
/* Replace instructions with better alternatives for this CPU type.
This runs before SMP is initialized to avoid SMP problems with
@ -196,7 +201,8 @@ extern u8 *__smp_locks[], *__smp_locks_end[];
APs have less capabilities than the boot processor are not handled.
Tough. Make sure you disable such features by hand. */
void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
void __init_or_module apply_alternatives(struct alt_instr *start,
struct alt_instr *end)
{
struct alt_instr *a;
char insnbuf[MAX_PATCH_LEN];
@ -279,9 +285,10 @@ static LIST_HEAD(smp_alt_modules);
static DEFINE_MUTEX(smp_alt);
static int smp_mode = 1; /* protected by smp_alt */
void alternatives_smp_module_add(struct module *mod, char *name,
void *locks, void *locks_end,
void *text, void *text_end)
void __init_or_module alternatives_smp_module_add(struct module *mod,
char *name,
void *locks, void *locks_end,
void *text, void *text_end)
{
struct smp_alt_module *smp;
@ -317,7 +324,7 @@ void alternatives_smp_module_add(struct module *mod, char *name,
mutex_unlock(&smp_alt);
}
void alternatives_smp_module_del(struct module *mod)
void __init_or_module alternatives_smp_module_del(struct module *mod)
{
struct smp_alt_module *item;
@ -386,8 +393,8 @@ void alternatives_smp_switch(int smp)
#endif
#ifdef CONFIG_PARAVIRT
void apply_paravirt(struct paravirt_patch_site *start,
struct paravirt_patch_site *end)
void __init_or_module apply_paravirt(struct paravirt_patch_site *start,
struct paravirt_patch_site *end)
{
struct paravirt_patch_site *p;
char insnbuf[MAX_PATCH_LEN];
@ -485,7 +492,8 @@ void __init alternative_instructions(void)
* instructions. And on the local CPU you need to be protected again NMI or MCE
* handlers seeing an inconsistent instruction while you patch.
*/
void *text_poke_early(void *addr, const void *opcode, size_t len)
static void *__init_or_module text_poke_early(void *addr, const void *opcode,
size_t len)
{
unsigned long flags;
local_irq_save(flags);

31
arch/x86/kernel/apm_32.c
View File

@ -403,7 +403,15 @@ static DECLARE_WAIT_QUEUE_HEAD(apm_waitqueue);
static DECLARE_WAIT_QUEUE_HEAD(apm_suspend_waitqueue);
static struct apm_user *user_list;
static DEFINE_SPINLOCK(user_list_lock);
static const struct desc_struct bad_bios_desc = { { { 0, 0x00409200 } } };
/*
* Set up a segment that references the real mode segment 0x40
* that extends up to the end of page zero (that we have reserved).
* This is for buggy BIOS's that refer to (real mode) segment 0x40
* even though they are called in protected mode.
*/
static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
(unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
static const char driver_version[] = "1.16ac"; /* no spaces */
@ -2331,15 +2339,6 @@ static int __init apm_init(void)
}
pm_flags |= PM_APM;
/*
* Set up a segment that references the real mode segment 0x40
* that extends up to the end of page zero (that we have reserved).
* This is for buggy BIOS's that refer to (real mode) segment 0x40
* even though they are called in protected mode.
*/
set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
_set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
/*
* Set up the long jump entry point to the APM BIOS, which is called
* from inline assembly.
@ -2358,12 +2357,12 @@ static int __init apm_init(void)
* code to that CPU.
*/
gdt = get_cpu_gdt_table(0);
set_base(gdt[APM_CS >> 3],
__va((unsigned long)apm_info.bios.cseg << 4));
set_base(gdt[APM_CS_16 >> 3],
__va((unsigned long)apm_info.bios.cseg_16 << 4));
set_base(gdt[APM_DS >> 3],
__va((unsigned long)apm_info.bios.dseg << 4));
set_desc_base(&gdt[APM_CS >> 3],
(unsigned long)__va((unsigned long)apm_info.bios.cseg << 4));
set_desc_base(&gdt[APM_CS_16 >> 3],
(unsigned long)__va((unsigned long)apm_info.bios.cseg_16 << 4));
set_desc_base(&gdt[APM_DS >> 3],
(unsigned long)__va((unsigned long)apm_info.bios.dseg << 4));
proc_create("apm", 0, NULL, &apm_file_ops);

42
arch/x86/kernel/cpu/common.c
View File

@ -94,45 +94,45 @@ DEFINE_PER_CPU_PAGE_ALIGNED(struct gdt_page, gdt_page) = { .gdt = {
* TLS descriptors are currently at a different place compared to i386.
* Hopefully nobody expects them at a fixed place (Wine?)
*/
[GDT_ENTRY_KERNEL32_CS] = { { { 0x0000ffff, 0x00cf9b00 } } },
[GDT_ENTRY_KERNEL_CS] = { { { 0x0000ffff, 0x00af9b00 } } },
[GDT_ENTRY_KERNEL_DS] = { { { 0x0000ffff, 0x00cf9300 } } },
[GDT_ENTRY_DEFAULT_USER32_CS] = { { { 0x0000ffff, 0x00cffb00 } } },
[GDT_ENTRY_DEFAULT_USER_DS] = { { { 0x0000ffff, 0x00cff300 } } },
[GDT_ENTRY_DEFAULT_USER_CS] = { { { 0x0000ffff, 0x00affb00 } } },
[GDT_ENTRY_KERNEL32_CS] = GDT_ENTRY_INIT(0xc09b, 0, 0xfffff),
[GDT_ENTRY_KERNEL_CS] = GDT_ENTRY_INIT(0xa09b, 0, 0xfffff),
[GDT_ENTRY_KERNEL_DS] = GDT_ENTRY_INIT(0xc093, 0, 0xfffff),
[GDT_ENTRY_DEFAULT_USER32_CS] = GDT_ENTRY_INIT(0xc0fb, 0, 0xfffff),
[GDT_ENTRY_DEFAULT_USER_DS] = GDT_ENTRY_INIT(0xc0f3, 0, 0xfffff),
[GDT_ENTRY_DEFAULT_USER_CS] = GDT_ENTRY_INIT(0xa0fb, 0, 0xfffff),
#else
[GDT_ENTRY_KERNEL_CS] = { { { 0x0000ffff, 0x00cf9a00 } } },
[GDT_ENTRY_KERNEL_DS] = { { { 0x0000ffff, 0x00cf9200 } } },
[GDT_ENTRY_DEFAULT_USER_CS] = { { { 0x0000ffff, 0x00cffa00 } } },
[GDT_ENTRY_DEFAULT_USER_DS] = { { { 0x0000ffff, 0x00cff200 } } },
[GDT_ENTRY_KERNEL_CS] = GDT_ENTRY_INIT(0xc09a, 0, 0xfffff),
[GDT_ENTRY_KERNEL_DS] = GDT_ENTRY_INIT(0xc092, 0, 0xfffff),
[GDT_ENTRY_DEFAULT_USER_CS] = GDT_ENTRY_INIT(0xc0fa, 0, 0xfffff),
[GDT_ENTRY_DEFAULT_USER_DS] = GDT_ENTRY_INIT(0xc0f2, 0, 0xfffff),
/*
* Segments used for calling PnP BIOS have byte granularity.
* They code segments and data segments have fixed 64k limits,
* the transfer segment sizes are set at run time.
*/
/* 32-bit code */
[GDT_ENTRY_PNPBIOS_CS32] = { { { 0x0000ffff, 0x00409a00 } } },
[GDT_ENTRY_PNPBIOS_CS32] = GDT_ENTRY_INIT(0x409a, 0, 0xffff),
/* 16-bit code */
[GDT_ENTRY_PNPBIOS_CS16] = { { { 0x0000ffff, 0x00009a00 } } },
[GDT_ENTRY_PNPBIOS_CS16] = GDT_ENTRY_INIT(0x009a, 0, 0xffff),
/* 16-bit data */
[GDT_ENTRY_PNPBIOS_DS] = { { { 0x0000ffff, 0x00009200 } } },
[GDT_ENTRY_PNPBIOS_DS] = GDT_ENTRY_INIT(0x0092, 0, 0xffff),
/* 16-bit data */
[GDT_ENTRY_PNPBIOS_TS1] = { { { 0x00000000, 0x00009200 } } },
[GDT_ENTRY_PNPBIOS_TS1] = GDT_ENTRY_INIT(0x0092, 0, 0),
/* 16-bit data */
[GDT_ENTRY_PNPBIOS_TS2] = { { { 0x00000000, 0x00009200 } } },
[GDT_ENTRY_PNPBIOS_TS2] = GDT_ENTRY_INIT(0x0092, 0, 0),
/*
* The APM segments have byte granularity and their bases
* are set at run time. All have 64k limits.
*/
/* 32-bit code */
[GDT_ENTRY_APMBIOS_BASE] = { { { 0x0000ffff, 0x00409a00 } } },
[GDT_ENTRY_APMBIOS_BASE] = GDT_ENTRY_INIT(0x409a, 0, 0xffff),
/* 16-bit code */
[GDT_ENTRY_APMBIOS_BASE+1] = { { { 0x0000ffff, 0x00009a00 } } },
[GDT_ENTRY_APMBIOS_BASE+1] = GDT_ENTRY_INIT(0x009a, 0, 0xffff),
/* data */
[GDT_ENTRY_APMBIOS_BASE+2] = { { { 0x0000ffff, 0x00409200 } } },
[GDT_ENTRY_APMBIOS_BASE+2] = GDT_ENTRY_INIT(0x4092, 0, 0xffff),
[GDT_ENTRY_ESPFIX_SS] = { { { 0x0000ffff, 0x00cf9200 } } },
[GDT_ENTRY_PERCPU] = { { { 0x0000ffff, 0x00cf9200 } } },
[GDT_ENTRY_ESPFIX_SS] = GDT_ENTRY_INIT(0xc092, 0, 0xfffff),
[GDT_ENTRY_PERCPU] = GDT_ENTRY_INIT(0xc092, 0, 0xfffff),
GDT_STACK_CANARY_INIT
#endif
} };
@ -1043,7 +1043,7 @@ DEFINE_PER_CPU(struct orig_ist, orig_ist);
#else /* CONFIG_X86_64 */
#ifdef CONFIG_CC_STACKPROTECTOR
DEFINE_PER_CPU(unsigned long, stack_canary);
DEFINE_PER_CPU_ALIGNED(struct stack_canary, stack_canary);
#endif
/* Make sure %fs and %gs are initialized properly in idle threads */

4
arch/x86/kernel/doublefault_32.c
View File

@ -27,9 +27,7 @@ static void doublefault_fn(void)
if (ptr_ok(gdt)) {
gdt += GDT_ENTRY_TSS << 3;
tss = *(u16 *)(gdt+2);
tss += *(u8 *)(gdt+4) << 16;
tss += *(u8 *)(gdt+7) << 24;
tss = get_desc_base((struct desc_struct *)gdt);
printk(KERN_EMERG "double fault, tss at %08lx\n", tss);
if (ptr_ok(tss)) {

1
arch/x86/kernel/head_32.S
View File

@ -439,7 +439,6 @@ is386: movl $2,%ecx # set MP
jne 1f
movl $per_cpu__gdt_page,%eax
movl $per_cpu__stack_canary,%ecx
subl $20, %ecx
movw %cx, 8 * GDT_ENTRY_STACK_CANARY + 2(%eax)
shrl $16, %ecx
movb %cl, 8 * GDT_ENTRY_STACK_CANARY + 4(%eax)

9
arch/x86/kernel/step.c
View File

@ -4,6 +4,7 @@
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/ptrace.h>
#include <asm/desc.h>
unsigned long convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs)
{
@ -23,7 +24,7 @@ unsigned long convert_ip_to_linear(struct task_struct *child, struct pt_regs *re
* and APM bios ones we just ignore here.
*/
if ((seg & SEGMENT_TI_MASK) == SEGMENT_LDT) {
u32 *desc;
struct desc_struct *desc;
unsigned long base;
seg &= ~7UL;
@ -33,12 +34,10 @@ unsigned long convert_ip_to_linear(struct task_struct *child, struct pt_regs *re
addr = -1L; /* bogus selector, access would fault */
else {
desc = child->mm->context.ldt + seg;
base = ((desc[0] >> 16) |
((desc[1] & 0xff) << 16) |
(desc[1] & 0xff000000));
base = get_desc_base(desc);
/* 16-bit code segment? */
if (!((desc[1] >> 22) & 1))
if (!desc->d)
addr &= 0xffff;
addr += base;
}

21
arch/x86/kernel/traps.c
View File

@ -786,27 +786,6 @@ do_spurious_interrupt_bug(struct pt_regs *regs, long error_code)
#endif
}
#ifdef CONFIG_X86_32
unsigned long patch_espfix_desc(unsigned long uesp, unsigned long kesp)
{
struct desc_struct *gdt = get_cpu_gdt_table(smp_processor_id());
unsigned long base = (kesp - uesp) & -THREAD_SIZE;
unsigned long new_kesp = kesp - base;
unsigned long lim_pages = (new_kesp | (THREAD_SIZE - 1)) >> PAGE_SHIFT;
__u64 desc = *(__u64 *)&gdt[GDT_ENTRY_ESPFIX_SS];
/* Set up base for espfix segment */
desc &= 0x00f0ff0000000000ULL;
desc |= ((((__u64)base) << 16) & 0x000000ffffff0000ULL) |
((((__u64)base) << 32) & 0xff00000000000000ULL) |
((((__u64)lim_pages) << 32) & 0x000f000000000000ULL) |
(lim_pages & 0xffff);
*(__u64 *)&gdt[GDT_ENTRY_ESPFIX_SS] = desc;
return new_kesp;
}
#endif
asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void)
{
}

25
drivers/pnp/pnpbios/bioscalls.c
View File

@ -55,12 +55,13 @@ __asm__(".text \n"
#define Q2_SET_SEL(cpu, selname, address, size) \
do { \
struct desc_struct *gdt = get_cpu_gdt_table((cpu)); \
set_base(gdt[(selname) >> 3], (u32)(address)); \
set_limit(gdt[(selname) >> 3], size); \
struct desc_struct *gdt = get_cpu_gdt_table((cpu)); \
set_desc_base(&gdt[(selname) >> 3], (u32)(address)); \
set_desc_limit(&gdt[(selname) >> 3], (size) - 1); \
} while(0)
static struct desc_struct bad_bios_desc;
static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092,
(unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1);
/*
* At some point we want to use this stack frame pointer to unwind
@ -476,19 +477,15 @@ void pnpbios_calls_init(union pnp_bios_install_struct *header)
pnp_bios_callpoint.offset = header->fields.pm16offset;
pnp_bios_callpoint.segment = PNP_CS16;
bad_bios_desc.a = 0;
bad_bios_desc.b = 0x00409200;
set_base(bad_bios_desc, __va((unsigned long)0x40 << 4));
_set_limit((char *)&bad_bios_desc, 4095 - (0x40 << 4));
for_each_possible_cpu(i) {
struct desc_struct *gdt = get_cpu_gdt_table(i);
if (!gdt)
continue;
set_base(gdt[GDT_ENTRY_PNPBIOS_CS32], &pnp_bios_callfunc);
set_base(gdt[GDT_ENTRY_PNPBIOS_CS16],
__va(header->fields.pm16cseg));
set_base(gdt[GDT_ENTRY_PNPBIOS_DS],
__va(header->fields.pm16dseg));
set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_CS32],
(unsigned long)&pnp_bios_callfunc);
set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_CS16],
(unsigned long)__va(header->fields.pm16cseg));
set_desc_base(&gdt[GDT_ENTRY_PNPBIOS_DS],
(unsigned long)__va(header->fields.pm16dseg));
}
}

3
include/asm-generic/percpu.h
View File

@ -81,14 +81,17 @@ extern void setup_per_cpu_areas(void);
#ifdef MODULE
#define PER_CPU_SHARED_ALIGNED_SECTION ""
#define PER_CPU_ALIGNED_SECTION ""
#else
#define PER_CPU_SHARED_ALIGNED_SECTION ".shared_aligned"
#define PER_CPU_ALIGNED_SECTION ".shared_aligned"
#endif
#define PER_CPU_FIRST_SECTION ".first"
#else
#define PER_CPU_SHARED_ALIGNED_SECTION ""
#define PER_CPU_ALIGNED_SECTION ".shared_aligned"
#define PER_CPU_FIRST_SECTION ""
#endif

12
include/linux/init.h
View File

@ -103,8 +103,8 @@
#define __INIT .section ".init.text","ax"
#define __FINIT .previous
#define __INITDATA .section ".init.data","aw"
#define __INITRODATA .section ".init.rodata","a"
#define __INITDATA .section ".init.data","aw",%progbits
#define __INITRODATA .section ".init.rodata","a",%progbits
#define __FINITDATA .previous
#define __DEVINIT .section ".devinit.text", "ax"
@ -305,9 +305,17 @@ void __init parse_early_options(char *cmdline);
#ifdef CONFIG_MODULES
#define __init_or_module
#define __initdata_or_module
#define __initconst_or_module
#define __INIT_OR_MODULE .text
#define __INITDATA_OR_MODULE .data
#define __INITRODATA_OR_MODULE .section ".rodata","a",%progbits
#else
#define __init_or_module __init
#define __initdata_or_module __initdata
#define __initconst_or_module __initconst
#define __INIT_OR_MODULE __INIT
#define __INITDATA_OR_MODULE __INITDATA
#define __INITRODATA_OR_MODULE __INITRODATA
#endif /*CONFIG_MODULES*/
/* Functions marked as __devexit may be discarded at kernel link time, depending

8
include/linux/percpu-defs.h
View File

@ -66,6 +66,14 @@
DEFINE_PER_CPU_SECTION(type, name, PER_CPU_SHARED_ALIGNED_SECTION) \
____cacheline_aligned_in_smp
#define DECLARE_PER_CPU_ALIGNED(type, name) \
DECLARE_PER_CPU_SECTION(type, name, PER_CPU_ALIGNED_SECTION) \
____cacheline_aligned
#define DEFINE_PER_CPU_ALIGNED(type, name) \
DEFINE_PER_CPU_SECTION(type, name, PER_CPU_ALIGNED_SECTION) \
____cacheline_aligned
/*
* Declaration/definition used for per-CPU variables that must be page aligned.
*/