diff options
| author | Baruch Siach <baruch@tkos.co.il> | 2013-10-15 02:22:43 +0400 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-11-28 14:02:04 +0000 |
| commit | 06512214e58849e661a67cdc215ca7af26afa58a (patch) | |
| tree | c2c9869ee26a8b8e11893138e22e7b0faaa9f183 /arch/xtensa | |
| parent | 6c76c2d92d331a029c88355d676cc68982c236d1 (diff) | |
| download | kernel_samsung_smdk4412-06512214e58849e661a67cdc215ca7af26afa58a.zip kernel_samsung_smdk4412-06512214e58849e661a67cdc215ca7af26afa58a.tar.gz kernel_samsung_smdk4412-06512214e58849e661a67cdc215ca7af26afa58a.tar.bz2 | |
xtensa: don't use alternate signal stack on threads
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@tkos.co.il>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'arch/xtensa')
| -rw-r--r-- | arch/xtensa/kernel/signal.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/xtensa/kernel/signal.c b/arch/xtensa/kernel/signal.c index f2220b5..cf3e9cb 100644 --- a/arch/xtensa/kernel/signal.c +++ b/arch/xtensa/kernel/signal.c @@ -346,7 +346,7 @@ static void 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; } |