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authorIngo Molnar <mingo@elte.hu>2008-02-14 09:22:34 +0100
committerThomas Gleixner <tglx@linutronix.de>2008-05-26 16:15:31 +0200
commit7e09b2a02dae4616a5a26000169964b32f86cd35 (patch)
tree5dc54ff304fa9c73bd49cc8d93dfc0af1eb52e26 /kernel/rcupreempt_trace.c
parentce22bd92cba0958e052cb1ce0f89f1d3a02b60a7 (diff)
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x86: fix canary of the boot CPU's idle task
the boot CPU's idle task has a zero stackprotector canary value. this is a special task that is never forked, so the fork code does not randomize its canary. Do it when we hit cpu_idle(). Academic sidenote: this means that the early init code runs with a zero canary and hence the canary becomes predictable for this short, boot-only amount of time. Although attack vectors against early init code are very rare, it might make sense to move this initialization to an earlier point. (to one of the early init functions that never return - such as start_kernel()) Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/rcupreempt_trace.c')
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