This is a note to let you know that I've just added the patch titled
xtensa: don't use alternate signal stack on threads
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xtensa-don-t-use-alternate-signal-stack-on-threads.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From cba9a90053e3b7973eff4f1946f33032e98eeed5 Mon Sep 17 00:00:00 2001
From: Baruch Siach <baruch@xxxxxxxxxx>
Date: Tue, 15 Oct 2013 02:22:43 +0400
Subject: xtensa: don't use alternate signal stack on threads
From: Baruch Siach <baruch@xxxxxxxxxx>
commit cba9a90053e3b7973eff4f1946f33032e98eeed5 upstream.
According to create_thread(3): "The new thread does not inherit the creating
thread's alternate signal stack". Since commit f9a3879a (Fix sigaltstack
corruption among cloned threads), current->sas_ss_size is set to 0 for cloned
processes sharing VM with their parent. Don't use the (nonexistent) alternate
signal stack in this case. This has been broken since commit 29c4dfd9 ([XTENSA]
Remove non-rt signal handling).
Fixes the SA_ONSTACK part of the nptl/tst-cancel20 test from uClibc.
Signed-off-by: Baruch Siach <baruch@xxxxxxxxxx>
Signed-off-by: Max Filippov <jcmvbkbc@xxxxxxxxx>
Signed-off-by: Chris Zankel <chris@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/xtensa/kernel/signal.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/xtensa/kernel/signal.c
+++ b/arch/xtensa/kernel/signal.c
@@ -343,7 +343,7 @@ static int setup_frame(int sig, struct k
sp = regs->areg[1];
- if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! on_sig_stack(sp)) {
+ if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && sas_ss_flags(sp) == 0) {
sp = current->sas_ss_sp + current->sas_ss_size;
}
Patches currently in stable-queue which might be from baruch@xxxxxxxxxx are
queue-3.4/xtensa-don-t-use-alternate-signal-stack-on-threads.patch
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