Revert "x86: signal: change type of paramter for sys_rt_sigreturn()"

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This reverts commit 4217458daf.

Justin Madru bisected this commit, it was causing weird Firefox
crashes.

The reason is that GCC mis-optimizes (re-uses) the on-stack parameters of
the calling frame, which corrupts the syscall return pt_regs state and
thus corrupts user-space register state.

So we go back to the slightly less clean but more optimization-safe
method of getting to pt_regs. Also add a comment to explain this.

Resolves: http://bugzilla.kernel.org/show_bug.cgi?id=12505

Reported-and-bisected-by: Justin Madru <jdm64@gawab.com>
Tested-by: Justin Madru <jdm64@gawab.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

This commit is contained in:

Ingo Molnar 2009-01-20 09:31:49 +01:00

parent e0a96129db

commit 552b8aa4d1

2 changed files with 10 additions and 3 deletions

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2

arch/x86/include/asm/syscalls.h

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11

arch/x86/kernel/signal.c

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