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x86: fix x86_32 stack protector bugs

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Impact: fix x86_32 stack protector

Brian Gerst found out that %gs was being initialized to stack_canary
instead of stack_canary - 20, which basically gave the same canary
value for all threads.  Fixing this also exposed the following bugs.

* cpu_idle() didn't call boot_init_stack_canary()

* stack canary switching in switch_to() was being done too late making
  the initial run of a new thread use the old stack canary value.

Fix all of them and while at it update comment in cpu_idle() about
calling boot_init_stack_canary().

Reported-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Tejun Heo 2009-02-11 16:31:00 +09:00 committed by Ingo Molnar
parent 60a5317ff0
commit 5c79d2a517
5 changed files with 20 additions and 12 deletions
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2
arch/x86/include/asm/stackprotector.h
View File

@ -85,7 +85,7 @@ static __always_inline void boot_init_stack_canary(void)
static inline void setup_stack_canary_segment(int cpu)
{
#ifdef CONFIG_X86_32
unsigned long canary = (unsigned long)&per_cpu(stack_canary, cpu);
unsigned long canary = (unsigned long)&per_cpu(stack_canary, cpu) - 20;
struct desc_struct *gdt_table = get_cpu_gdt_table(cpu);
struct desc_struct desc;

8
arch/x86/include/asm/system.h
View File

@ -25,13 +25,11 @@ struct task_struct *__switch_to(struct task_struct *prev,
#ifdef CONFIG_CC_STACKPROTECTOR
#define __switch_canary \
"movl "__percpu_arg([current_task])",%%ebx\n\t" \
"movl %P[task_canary](%%ebx),%%ebx\n\t" \
"movl %%ebx,"__percpu_arg([stack_canary])"\n\t"
"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))
#define __switch_canary_iparam \
, [current_task] "m" (per_cpu_var(current_task)) \
, [task_canary] "i" (offsetof(struct task_struct, stack_canary))
#else /* CC_STACKPROTECTOR */
#define __switch_canary
@ -60,9 +58,9 @@ do { \
"movl %[next_sp],%%esp\n\t" /* restore ESP */ \
"movl $1f,%[prev_ip]\n\t" /* save EIP */ \
"pushl %[next_ip]\n\t" /* restore EIP */ \
__switch_canary \
"jmp __switch_to\n" /* regparm call */ \
"1:\t" \
__switch_canary \
"popl %%ebp\n\t" /* restore EBP */ \
"popfl\n" /* restore flags */ \
\

1
arch/x86/kernel/head_32.S
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@ -447,6 +447,7 @@ 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)

10
arch/x86/kernel/process_32.c
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@ -11,6 +11,7 @@
#include <stdarg.h>
#include <linux/stackprotector.h>
#include <linux/cpu.h>
#include <linux/errno.h>
#include <linux/sched.h>
@ -91,6 +92,15 @@ void cpu_idle(void)
{
int cpu = smp_processor_id();
/*
* If we're the non-boot CPU, nothing set the stack canary up
* for us. CPU0 already has it initialized but no harm in
* doing it again. This is a good place for updating it, as
* we wont ever return from this function (so the invalid
* canaries already on the stack wont ever trigger).
*/
boot_init_stack_canary();
current_thread_info()->status |= TS_POLLING;
/* endless idle loop with no priority at all */

11
arch/x86/kernel/process_64.c
View File

@ -120,12 +120,11 @@ void cpu_idle(void)
current_thread_info()->status |= TS_POLLING;
/*
* If we're the non-boot CPU, nothing set the PDA stack
* canary up for us - and if we are the boot CPU we have
* a 0 stack canary. This is a good place for updating
* it, as we wont ever return from this function (so the
* invalid canaries already on the stack wont ever
* trigger):
* If we're the non-boot CPU, nothing set the stack canary up
* for us. CPU0 already has it initialized but no harm in
* doing it again. This is a good place for updating it, as
* we wont ever return from this function (so the invalid
* canaries already on the stack wont ever trigger).
*/
boot_init_stack_canary();