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| author |   Al Viro <viro@zeniv.linux.org.uk> | 2010-09-18 08:40:07 -0400 |
|---|---|---|
| committer |   Matt Turner <mattst88@gmail.com> | 2010-09-18 23:08:28 -0400 |
| commit | 392fb6e35400edbee183baba24b34a0fa2053813 (patch) | |
| tree | e11587c8b7ca75ab41b23f9e09e2c6a9365e2187 /arch/alpha/include/asm/unistd.h | |
| parent | alpha: belated ERESTART_RESTARTBLOCK race fix (diff) | |
| download | linux-dev-392fb6e35400edbee183baba24b34a0fa2053813.tar.xz linux-dev-392fb6e35400edbee183baba24b34a0fa2053813.zip | |
alpha: unb0rk sigsuspend() and rt_sigsuspend()
Old code used to set regs->r0 and regs->r19 to force the right
return value. Leaving that after switch to ERESTARTNOHAND
was a Bad Idea(tm), since now that screws the restart - if we
hit the case when get_signal_to_deliver() returns 0, we will
step back to syscall insn, with v0 set to EINTR and a3 to 1.
The latter won't matter, since EINTR is 4, aka __NR_write.
Testcase:
#include <signal.h>
#define _GNU_SOURCE
#include <unistd.h>
#include <sys/syscall.h>
main()
{
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, SIGCONT);
sigprocmask(SIG_SETMASK, &mask, NULL);
kill(0, SIGCONT);
syscall(__NR_sigsuspend, 1, "b0rken\n", 7);
}
results on alpha in immediate message to stdout...
Fix is obvious; moreover, since we don't need regs anymore, we can
switch to normal prototypes for these guys and lose the wrappers.
Even better, rt_sigsuspend() is identical to generic version in
kernel/signal.c now.
Tested-by: Michael Cree <mcree@orcon.net.nz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Matt Turner <mattst88@gmail.com>
Diffstat (limited to 'arch/alpha/include/asm/unistd.h')
| -rw-r--r-- | arch/alpha/include/asm/unistd.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/unistd.h b/arch/alpha/include/asm/unistd.h index 9a9672f0a346..058937bf5a77 100644 --- a/arch/alpha/include/asm/unistd.h +++ b/arch/alpha/include/asm/unistd.h @@ -466,6 +466,7 @@ #define __ARCH_WANT_SYS_OLD_GETRLIMIT #define __ARCH_WANT_SYS_OLDUMOUNT #define __ARCH_WANT_SYS_SIGPENDING +#define __ARCH_WANT_SYS_RT_SIGSUSPEND /* "Conditional" syscalls. What we want is |