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authorLaurent MEYER <meyerlau@fr.ibm.com>2006-06-23 05:05:36 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-23 10:43:05 -0400
commitd09042da7284a86ffbdd18695f517a71514ed598 (patch)
tree09e9a3de71a4a4cf6c8f8cb0c40ec0a916e01cae /arch/xtensa/kernel
parent785d55708c24c28d7646f3d1fe6c9f82fb714311 (diff)
[PATCH] fix incorrect SA_ONSTACK behaviour for 64-bit processes
- When setting a sighandler using sigaction() call, if the flag SA_ONSTACK is set and no alternate stack is provided via sigaltstack(), the kernel still try to install the alternate stack. This behavior is the opposite of the one which is documented in Single Unix Specifications V3. - Also when setting an alternate stack using sigaltstack() with the flag SS_DISABLE, the kernel try to install the alternate stack on signal delivery. These two use cases makes the process crash at signal delivery. Signed-off-by: Laurent Meyer <meyerlau@fr.ibm.com> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: David Howells <dhowells@redhat.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp> Cc: Chris Zankel <chris@zankel.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/xtensa/kernel')
-rw-r--r--arch/xtensa/kernel/signal.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/xtensa/kernel/signal.c b/arch/xtensa/kernel/signal.c
index beba497e78df..c494f0826fc5 100644
--- a/arch/xtensa/kernel/signal.c
+++ b/arch/xtensa/kernel/signal.c
@@ -433,7 +433,7 @@ badframe:
433static inline void * 433static inline void *
434get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) 434get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
435{ 435{
436 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! on_sig_stack(sp)) 436 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
437 sp = current->sas_ss_sp + current->sas_ss_size; 437 sp = current->sas_ss_sp + current->sas_ss_size;
438 438
439 return (void *)((sp - frame_size) & -16ul); 439 return (void *)((sp - frame_size) & -16ul);