x86: signal: check signal stack overflow properly

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Impact: cleanup

Check alternate signal stack overflow with proper stack pointer.
The stack pointer of the next signal frame is different if that
task has i387 state.

On x86_64, redzone would be included.

No need to check SA_ONSTACK if we're already using alternate signal stack.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Cc: Roland McGrath <roland@redhat.com>
LKML-Reference: <49C2874D.3080002@ct.jp.nec.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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This commit is contained in:

Hiroshi Shimamoto 2009-03-19 10:56:29 -07:00 • committed by Ingo Molnar

parent 7f00a2495b

commit 14fc9fbc70

1 changed files with 27 additions and 21 deletions

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arch/x86/kernel/signal.c

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