block uid/gid changes during posix_spawn

[musl] / src / process / posix_spawn.c

diff --git a/src/process/posix_spawn.c b/src/process/posix_spawn.c
index 604756e..8a6ff6d 100644 (file)
--- a/src/process/posix_spawn.c
+++ b/src/process/posix_spawn.c
@@ -5,9 +5,16 @@
 #include <fcntl.h>
 #include "syscall.h"
 #include "fdop.h"
+#include "libc.h"
 
 extern char **environ;
 
+static void dummy_0()
+{
+}
+weak_alias(dummy_0, __acquire_ptc);
+weak_alias(dummy_0, __release_ptc);
+
 pid_t __vfork(void);
 
 int __posix_spawnx(pid_t *restrict res, const char *restrict path,
@@ -24,7 +31,10 @@ int __posix_spawnx(pid_t *restrict res, const char *restrict path,
        if (!attr) attr = &dummy_attr;
 
        sigprocmask(SIG_BLOCK, (void *)(uint64_t []){-1}, &oldmask);
+
+       __acquire_ptc();
        pid = __vfork();
+       __release_ptc();
 
        if (pid) {
                sigprocmask(SIG_SETMASK, &oldmask, 0);