Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

torvalds · torvalds · commit b4642c109f9b · 2017-02-22T18:08:50.000-08:00
Pull seccomp fix from James Morris:
 "A fix for a regression in the seccomp code (it was supposed to be in
  the first pull req but I had it queued in the wrong branch)"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
  seccomp: Only dump core when single-threaded
diff --git a/kernel/seccomp.c b/kernel/seccomp.c
@@ -643,11 +643,14 @@ static int __seccomp_filter(int this_syscall, const struct seccomp_data *sd,
 	default: {
 		siginfo_t info;
 		audit_seccomp(this_syscall, SIGSYS, action);
-		/* Show the original registers in the dump. */
-		syscall_rollback(current, task_pt_regs(current));
-		/* Trigger a manual coredump since do_exit skips it. */
-		seccomp_init_siginfo(&info, this_syscall, data);
-		do_coredump(&info);
+		/* Dump core only if this is the last remaining thread. */
+		if (get_nr_threads(current) == 1) {
+			/* Show the original registers in the dump. */
+			syscall_rollback(current, task_pt_regs(current));
+			/* Trigger a manual coredump since do_exit skips it. */
+			seccomp_init_siginfo(&info, this_syscall, data);
+			do_coredump(&info);
+		}
 		do_exit(SIGSYS);
 	}
 	}
