Re: [PATCH]x86_64 debug_stack nested patch

ok, EXCEPTION_STACK_ORDER + 1 is better for me.

in_exception_stack() function is to judge which IST stack by parameter stack value, if DEBUG_STKSZ value is set as 8K. The original function can not judge whether it is within DEBUG_STACK space.

Thanks
bibo,mao

Jan Beulich wrote:

Would you mind explaining why you
- needed to replace the handling of the DEBUG_STKSZ > EXCEPTION_STKSZ in in_exception_stack()?
- used a hard coded 1 instead of (EXCEPTION_STACK_ORDER + 1) for defining DEBUG_STACK_ORDER?

Thanks, Jan

"bibo,mao" <[email protected]> 10.05.06 08:45 >>>

hi,

In x86_64 platform, INT1 and INT3 trap stack is IST stack called DEBUG_STACK, when INT1/INT3 trap happens, system will switch to DEBUG_STACK by hardware. Current DEBUG_STACK size is 4K, when int1/int3 trap happens, kernel will minus current DEBUG_STACK IST value by 4k. But if int3/int1 trap is nested, it will destroy other vector's IST stack. This patch modifies this, it sets DEBUG_STACK size as 8K and allows two level of nested int1/int3 trap. Kprobe DEBUG_STACK may be nested, because kprobe hanlder may be probed by other kprobes. This patch is against 2.6.17-rc3.

Signed-Off-By: bibo, mao <[email protected]>

Thanks
bibo,mao
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