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-rw-r--r--nptl/init.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/nptl/init.c b/nptl/init.c
index 4db3e0c828..7cfe803c42 100644
--- a/nptl/init.c
+++ b/nptl/init.c
@@ -148,6 +148,14 @@ static const struct pthread_functions pthread_functions =
 static void
 sigcancel_handler (int sig, siginfo_t *si, void *ctx)
 {
+#ifdef __ASSUME_CORRECT_SI_PID
+  /* Determine the process ID.  It might be negative if the thread is
+     in the middle of a fork() call.  */
+  pid_t pid = THREAD_GETMEM (THREAD_SELF, pid);
+  if (__builtin_expect (pid < 0, 0))
+    pid = -pid;
+#endif
+
   /* Safety check.  It would be possible to call this function for
      other signals and send a signal from another process.  This is not
      correct and might even be a security problem.  Try to catch as
@@ -156,7 +164,7 @@ sigcancel_handler (int sig, siginfo_t *si, void *ctx)
 #ifdef __ASSUME_CORRECT_SI_PID
       /* Kernels before 2.5.75 stored the thread ID and not the process
 	 ID in si_pid so we skip this test.  */
-      || si->si_pid != THREAD_GETMEM (THREAD_SELF, pid)
+      || si->si_pid != pid
 #endif
       || si->si_code != SI_TKILL)
     return;
@@ -201,6 +209,14 @@ struct xid_command *__xidcmd attribute_hidden;
 static void
 sighandler_setxid (int sig, siginfo_t *si, void *ctx)
 {
+#ifdef __ASSUME_CORRECT_SI_PID
+  /* Determine the process ID.  It might be negative if the thread is
+     in the middle of a fork() call.  */
+  pid_t pid = THREAD_GETMEM (THREAD_SELF, pid);
+  if (__builtin_expect (pid < 0, 0))
+    pid = -pid;
+#endif
+
   /* Safety check.  It would be possible to call this function for
      other signals and send a signal from another process.  This is not
      correct and might even be a security problem.  Try to catch as
@@ -209,7 +225,7 @@ sighandler_setxid (int sig, siginfo_t *si, void *ctx)
 #ifdef __ASSUME_CORRECT_SI_PID
       /* Kernels before 2.5.75 stored the thread ID and not the process
 	 ID in si_pid so we skip this test.  */
-      || si->si_pid != THREAD_GETMEM (THREAD_SELF, pid)
+      || si->si_pid != pid
 #endif
       || si->si_code != SI_TKILL)
     return;