Commit cba9a900 authored Oct 15, 2013 by Baruch Siach Committed by Chris Zankel Oct 15, 2013

xtensa: don't use alternate signal stack on threads



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.

Cc: <stable@vger.kernel.org>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>

parent 244066f4

arch/xtensa/kernel/signal.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -341,7 +341,7 @@ static int setup_frame(int sig, struct k_sigaction ka, siginfo_t info,

		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;
		}