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authorMark Salter <msalter@redhat.com>2010-01-08 14:43:14 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-01-11 09:34:07 -0800
commit4c03ee7352f2f0ee393c7190ce0b758dd1217f57 (patch)
tree8f81d66cee3cd2a061664d3544b58b2362aa62e2 /arch/mn10300
parent004731b2c7c658d36bee167cb1e1a399c2cbccc9 (diff)
downloadop-kernel-dev-4c03ee7352f2f0ee393c7190ce0b758dd1217f57.zip
op-kernel-dev-4c03ee7352f2f0ee393c7190ce0b758dd1217f57.tar.gz
mn10300: signal stack fix
This fixes a signal stack handling problem in the MN10300 arch. When new threads are cloned with CLONE_VM, they don't inherit the alternate signal stack. They do share the signal flags, though. When deciding whether to use an alternate stack, the arch code needs to check to make sure the task struct contains a valid alternate stack. This patch fixes the MN10300 arch by using the sas_ss_flags() test provided by sched.h rather than the on_sig_stack() test which is insufficient by itself. Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/mn10300')
-rw-r--r--arch/mn10300/kernel/signal.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/mn10300/kernel/signal.c b/arch/mn10300/kernel/signal.c
index a21f43b..717db14 100644
--- a/arch/mn10300/kernel/signal.c
+++ b/arch/mn10300/kernel/signal.c
@@ -264,7 +264,7 @@ static inline void __user *get_sigframe(struct k_sigaction *ka,
/* 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) == 0)
sp = current->sas_ss_sp + current->sas_ss_size;
}
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