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[PATCH] s390: alternate signal stack handling bug

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If a signal handler has been established with the SA_ONSTACK option but no
alternate stack is provided with sigaltstack(), the kernel still tries to
install the alternate stack.  Also when setting an alternate stack with
sigalstack() and the SS_DISABLE flag, the kernel tries to install the
alternate stack on signal delivery.  Use the correct conditions sas_ss_flags()
to check if the alternate stack has to be used.

Signed-off-by: Laurent Meyer <meyerlau@fr.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Laurent Meyer 2006-04-27 18:40:07 -07:00 committed by Linus Torvalds
parent 6dcfca78d4
commit 28f223782b
1 changed files with 1 additions and 1 deletions
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2
arch/s390/kernel/compat_signal.c
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@ -430,7 +430,7 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
/* This is the X/Open sanctioned signal stack switching. */
if (ka->sa.sa_flags & SA_ONSTACK) {
if (! on_sig_stack(sp))
if (! sas_ss_flags(sp))
sp = current->sas_ss_sp + current->sas_ss_size;
}