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authorLaurent MEYER <meyerlau@fr.ibm.com>2006-03-27 11:37:41 +0200
committerPaul Mackerras <paulus@samba.org>2006-03-28 16:45:24 +1100
commit11089f08d9dd8b89cd07d6f126ccb4849e3c61a3 (patch)
treedb5780ca34bee26bfcb1bbbdb8a2a3ab71c14b5a /arch/powerpc
parent5149fa47ec90eb5e79e28f3a7fbcf29421524817 (diff)
[PATCH] powerpc: 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. This fixes it. Signed-off-by: Laurent Meyer <meyerlau@fr.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kernel/signal_64.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index 82ec2f3f671..27f65b95184 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -212,7 +212,7 @@ static inline void __user * get_sigframe(struct k_sigaction *ka, struct pt_regs
/* Default to using normal stack */
newsp = regs->gpr[1];
- if (ka->sa.sa_flags & SA_ONSTACK) {
+ if ((ka->sa.sa_flags & SA_ONSTACK) && current->sas_ss_size) {
if (! on_sig_stack(regs->gpr[1]))
newsp = (current->sas_ss_sp + current->sas_ss_size);
}