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| author |   Ingo Molnar <mingo@elte.hu> | 2009-01-19 12:36:09 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-01-19 12:36:09 +0100 |
| commit | 7890ba8c87604ca4c2c73f7de846bf5305d743e4 (patch) | |
| tree | f3f920c09b8de694b1bc1d4b878cfd2b0b98c913 /arch/x86/kernel/process_64.c | |
| parent | Merge branch 'tj-percpu' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc into core/percpu (diff) | |
| parent | Merge branch 'core/percpu' into stackprotector (diff) | |
| download | linux-dev-7890ba8c87604ca4c2c73f7de846bf5305d743e4.tar.xz linux-dev-7890ba8c87604ca4c2c73f7de846bf5305d743e4.zip | |
Merge branch 'stackprotector' into core/percpu
Diffstat (limited to 'arch/x86/kernel/process_64.c')
| -rw-r--r-- | arch/x86/kernel/process_64.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 4523ff88a69d..aa89eabf09e0 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -16,6 +16,7 @@ #include <stdarg.h> +#include <linux/stackprotector.h> #include <linux/cpu.h> #include <linux/errno.h> #include <linux/sched.h> @@ -117,6 +118,17 @@ static inline void play_dead(void) 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): + */ + boot_init_stack_canary(); + /* endless idle loop with no priority at all */ while (1) { tick_nohz_stop_sched_tick(1); @@ -627,7 +639,6 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) (unsigned long)task_stack_page(next_p) + THREAD_SIZE - KERNEL_STACK_OFFSET); #ifdef CONFIG_CC_STACKPROTECTOR - write_pda(stack_canary, next_p->stack_canary); /* * Build time only check to make sure the stack_canary is at * offset 40 in the pda; this is a gcc ABI requirement |