diff options
Diffstat (limited to 'sysdeps/nptl/_Fork.c')
| -rw-r--r-- | sysdeps/nptl/_Fork.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/sysdeps/nptl/_Fork.c b/sysdeps/nptl/_Fork.c index ef199dd..7d970e3 100644 --- a/sysdeps/nptl/_Fork.c +++ b/sysdeps/nptl/_Fork.c @@ -17,11 +17,17 @@ <https://www.gnu.org/licenses/>. */ #include <arch-fork.h> +#include <libc-lock.h> #include <pthreadP.h> pid_t _Fork (void) { + /* The lock acquisition needs to be AS-safe to avoid deadlock if _Fork is + called from the signal handler that has interrupted fork itself. */ + internal_sigset_t set; + __abort_lock_lock (&set); + pid_t pid = arch_fork (&THREAD_SELF->tid); if (pid == 0) { @@ -44,6 +50,9 @@ _Fork (void) INTERNAL_SYSCALL_CALL (set_robust_list, &self->robust_head, sizeof (struct robust_list_head)); } + + __abort_lock_unlock (&set); + return pid; } libc_hidden_def (_Fork) |