Commit 28f22378 authored Apr 27, 2006 by Laurent Meyer Committed by Linus Torvalds Apr 28, 2006

[PATCH] s390: alternate signal stack handling bug

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>

parent 6dcfca78

arch/s390/kernel/compat_signal.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;
		}