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posix: Correctly block/unblock all signals on Linux posix_spawn

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This patch correctly block and unblocks all signals when executing
Linux posix_spawn by using the __libc_signal_{un}block_all functions
instead of default sigprocmask.  The latter might remove both
SIGCANCEL and SIGSETXID from the blocked signal list.

Checked on x86_64, i686, powerpc64le, and aarch64.

	* sysdeps/unix/sysv/linux/spawni.c (__spawnix): Correctly block and unblock
	all signals when executing the clone vfork child.
	(SIGALL_SET): Remove macro.
This commit is contained in:
Adhemerval Zanella 2016-09-14 14:41:21 -03:00
parent 706e6749de
commit 802c1c5a65
2 changed files with 6 additions and 6 deletions
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4
ChangeLog
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@ -1,5 +1,9 @@
2016-09-20 Adhemerval Zanella <adhemerval.zanella@linaro.org>
* sysdeps/unix/sysv/linux/spawni.c (__spawnix): Correctly block and unblock
all signals when executing the clone vfork child.
(SIGALL_SET): Remove macro.
* nptl/Makefile (tests): Add tst-exec5.
* nptl/tst-exec5.c: New file.
* sysdeps/unix/sysv/linux/spawni.c (__spawni): Correctly enable and disable

8
sysdeps/unix/sysv/linux/spawni.c
View File

@ -58,10 +58,6 @@
normal program exit with the exit code 127. */
#define SPAWN_ERROR 127
/* We need to block both SIGCANCEL and SIGSETXID. */
#define SIGALL_SET \
((__sigset_t) { .__val = {[0 ... _SIGSET_NWORDS-1 ] = -1 } })
#ifdef __ia64__
# define CLONE(__fn, __stack, __stacksize, __flags, __args) \
__clone2 (__fn, __stack, __stacksize, __flags, __args, 0, 0, 0)
@ -353,7 +349,7 @@ __spawnix (pid_t * pid, const char *file,
args.envp = envp;
args.xflags = xflags;
__sigprocmask (SIG_BLOCK, &SIGALL_SET, &args.oldmask);
__libc_signal_block_all (&args.oldmask);
/* The clone flags used will create a new child that will run in the same
memory space (CLONE_VM) and the execution of calling thread will be
@ -386,7 +382,7 @@ __spawnix (pid_t * pid, const char *file,
if ((ec == 0) && (pid != NULL))
*pid = new_pid;
__sigprocmask (SIG_SETMASK, &args.oldmask, 0);
__libc_signal_restore_set (&args.oldmask);
__libc_ptf_call (__pthread_setcancelstate, (state, NULL), 0);