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author | Thomas Gleixner <tglx@linutronix.de> | 2013-06-10 16:52:03 +0200 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2013-06-11 22:04:47 +0200 |
commit | d7880812b3594d3c6dcbe3cfd71dabb17347d082 (patch) | |
tree | 87d72f75a691ac0d23776afcde0e9f35c09d8148 /arch | |
parent | c7788792a5e7b0d5d7f96d0766b4cb6112d47d75 (diff) | |
download | linux-stable-d7880812b3594d3c6dcbe3cfd71dabb17347d082.tar.gz linux-stable-d7880812b3594d3c6dcbe3cfd71dabb17347d082.tar.bz2 linux-stable-d7880812b3594d3c6dcbe3cfd71dabb17347d082.zip |
idle: Add the stack canary init to cpu_startup_entry()
Moving x86 to the generic idle implementation (commit 7d1a9417 "x86:
Use generic idle loop") wreckaged the stack protector.
I stupidly missed that boot_init_stack_canary() must be inlined from a
function which never returns, but I put that call into
arch_cpu_idle_prepare() which of course returns.
I pondered to play tricks with arch_cpu_idle_prepare() first, but then
I noticed, that the other archs which have implemented the
stackprotector (ARM and SH) do not initialize the canary for the
non-boot cpus.
So I decided to move the boot_init_stack_canary() call into
cpu_startup_entry() ifdeffed with an CONFIG_X86 for now. This #ifdef
is just a temporary measure as I don't want to inflict the
boot_init_stack_canary() call on ARM and SH that late in the cycle.
I'll queue a patch for 3.11 which removes the #ifdef if the ARM/SH
maintainers have no objection.
Reported-by: Wouter van Kesteren <woutershep@gmail.com>
Cc: x86@kernel.org
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/x86/kernel/process.c | 12 |
1 files changed, 0 insertions, 12 deletions
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 4e7a37ff03ab..81a5f5e8f142 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -277,18 +277,6 @@ void exit_idle(void) } #endif -void arch_cpu_idle_prepare(void) -{ - /* - * 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(); -} - void arch_cpu_idle_enter(void) { local_touch_nmi(); |