Merge tag 'seccomp-v6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull seccomp updates from Kees Cook:

 - Provide USER_NOTIFY flag for synchronous mode (Andrei Vagin, Peter
   Oskolkov). This touches the scheduler and perf but has been Acked by
   Peter Zijlstra.

 - Fix regression in syscall skipping and restart tracing on arm32. This
   touches arch/arm/ but has been Acked by Arnd Bergmann.

* tag 'seccomp-v6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  seccomp: Add missing kerndoc notations
  ARM: ptrace: Restore syscall skipping for tracers
  ARM: ptrace: Restore syscall restart tracing
  selftests/seccomp: Handle arm32 corner cases better
  perf/benchmark: add a new benchmark for seccom_unotify
  selftest/seccomp: add a new test for the sync mode of seccomp_user_notify
  seccomp: add the synchronous mode for seccomp_unotify
  sched: add a few helpers to wake up tasks on the current cpu
  sched: add WF_CURRENT_CPU and externise ttwu
  seccomp: don't use semaphore and wait_queue together

1 files changed, 66 insertions, 1 deletions

diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
index 43ec36b179dc..38f651469968 100644
--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -2184,6 +2184,9 @@ FIXTURE_TEARDOWN(TRACE_syscall)
 
 TEST(negative_ENOSYS)
 {
+#if defined(__arm__)
+	SKIP(return, "arm32 does not support calling syscall -1");
+#endif
 	/*
 	 * There should be no difference between an "internal" skip
 	 * and userspace asking for syscall "-1".
@@ -3072,7 +3075,8 @@ TEST(syscall_restart)
 		timeout.tv_sec = 1;
 		errno = 0;
 		EXPECT_EQ(0, nanosleep(&timeout, NULL)) {
-			TH_LOG("Call to nanosleep() failed (errno %d)", errno);
+			TH_LOG("Call to nanosleep() failed (errno %d: %s)",
+				errno, strerror(errno));
 		}
 
 		/* Read final sync from parent. */
@@ -3908,6 +3912,9 @@ TEST(user_notification_filter_empty)
 		TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
 	}
 
+	if (__NR_clone3 < 0)
+		SKIP(return, "Test not built with clone3 support");
+
 	pid = sys_clone3(&args, sizeof(args));
 	ASSERT_GE(pid, 0);
 
@@ -3962,6 +3969,9 @@ TEST(user_notification_filter_empty_threaded)
 		TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
 	}
 
+	if (__NR_clone3 < 0)
+		SKIP(return, "Test not built with clone3 support");
+
 	pid = sys_clone3(&args, sizeof(args));
 	ASSERT_GE(pid, 0);
 
@@ -4255,6 +4265,61 @@ TEST(user_notification_addfd_rlimit)
 	close(memfd);
 }
 
+#ifndef SECCOMP_USER_NOTIF_FD_SYNC_WAKE_UP
+#define SECCOMP_USER_NOTIF_FD_SYNC_WAKE_UP (1UL << 0)
+#define SECCOMP_IOCTL_NOTIF_SET_FLAGS  SECCOMP_IOW(4, __u64)
+#endif
+
+TEST(user_notification_sync)
+{
+	struct seccomp_notif req = {};
+	struct seccomp_notif_resp resp = {};
+	int status, listener;
+	pid_t pid;
+	long ret;
+
+	ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
+	ASSERT_EQ(0, ret) {
+		TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
+	}
+
+	listener = user_notif_syscall(__NR_getppid,
+				      SECCOMP_FILTER_FLAG_NEW_LISTENER);
+	ASSERT_GE(listener, 0);
+
+	/* Try to set invalid flags. */
+	EXPECT_SYSCALL_RETURN(-EINVAL,
+		ioctl(listener, SECCOMP_IOCTL_NOTIF_SET_FLAGS, 0xffffffff, 0));
+
+	ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SET_FLAGS,
+			SECCOMP_USER_NOTIF_FD_SYNC_WAKE_UP, 0), 0);
+
+	pid = fork();
+	ASSERT_GE(pid, 0);
+	if (pid == 0) {
+		ret = syscall(__NR_getppid);
+		ASSERT_EQ(ret, USER_NOTIF_MAGIC) {
+			_exit(1);
+		}
+		_exit(0);
+	}
+
+	req.pid = 0;
+	ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
+
+	ASSERT_EQ(req.data.nr,  __NR_getppid);
+
+	resp.id = req.id;
+	resp.error = 0;
+	resp.val = USER_NOTIF_MAGIC;
+	resp.flags = 0;
+	ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
+
+	ASSERT_EQ(waitpid(pid, &status, 0), pid);
+	ASSERT_EQ(status, 0);
+}
+
+
 /* Make sure PTRACE_O_SUSPEND_SECCOMP requires CAP_SYS_ADMIN. */
 FIXTURE(O_SUSPEND_SECCOMP) {
 	pid_t pid;