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authorLaurent MEYER <meyerlau@fr.ibm.com>2006-04-06 08:45:19 +1000
committerGreg Kroah-Hartman <gregkh@suse.de>2006-04-17 13:16:04 -0700
commitbb532cb98cd10b4bbb14c0ce253fbaed16a761c4 (patch)
treea6fe9807e749c2dd09f5975aef8ca7d64e0d73b3
parentbce29a817a973634535f92aa217152177e82c3bd (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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-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 4324f8a8ba24..096dfdc7890e 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -213,7 +213,7 @@ 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);
}