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selftests/seccomp: Handle namespace failures gracefully
When running without USERNS or PIDNS the seccomp test would hang since
it was waiting forever for the child to trigger the user notification
since it seems the glibc() abort handler makes a call to getpid(),
which would trap again. This changes the getpid filter to getppid, and
makes sure ASSERTs execute to stop from spawning the listener.
Reported-by: Shuah Khan <shuah@kernel.org>
Fixes: 6a21cc50f0
("seccomp: add a return code to trap to userspace")
Cc: stable@vger.kernel.org # > 5.0
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Tycho Andersen <tycho@tycho.ws>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
parent
e14d314c7a
commit
9dd3fcb0ab
1 changed files with 23 additions and 20 deletions
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@ -3079,9 +3079,9 @@ TEST(user_notification_basic)
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/* Check that we get -ENOSYS with no listener attached */
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if (pid == 0) {
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if (user_trap_syscall(__NR_getpid, 0) < 0)
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if (user_trap_syscall(__NR_getppid, 0) < 0)
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exit(1);
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ret = syscall(__NR_getpid);
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ret = syscall(__NR_getppid);
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exit(ret >= 0 || errno != ENOSYS);
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}
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@ -3096,12 +3096,12 @@ TEST(user_notification_basic)
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EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0);
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/* Check that the basic notification machinery works */
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listener = user_trap_syscall(__NR_getpid,
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listener = user_trap_syscall(__NR_getppid,
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SECCOMP_FILTER_FLAG_NEW_LISTENER);
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ASSERT_GE(listener, 0);
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/* Installing a second listener in the chain should EBUSY */
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EXPECT_EQ(user_trap_syscall(__NR_getpid,
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EXPECT_EQ(user_trap_syscall(__NR_getppid,
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SECCOMP_FILTER_FLAG_NEW_LISTENER),
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-1);
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EXPECT_EQ(errno, EBUSY);
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@ -3110,7 +3110,7 @@ TEST(user_notification_basic)
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ASSERT_GE(pid, 0);
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if (pid == 0) {
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ret = syscall(__NR_getpid);
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ret = syscall(__NR_getppid);
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exit(ret != USER_NOTIF_MAGIC);
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}
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@ -3128,7 +3128,7 @@ TEST(user_notification_basic)
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EXPECT_GT(poll(&pollfd, 1, -1), 0);
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EXPECT_EQ(pollfd.revents, POLLOUT);
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EXPECT_EQ(req.data.nr, __NR_getpid);
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EXPECT_EQ(req.data.nr, __NR_getppid);
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resp.id = req.id;
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resp.error = 0;
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@ -3160,7 +3160,7 @@ TEST(user_notification_kill_in_middle)
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TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
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}
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listener = user_trap_syscall(__NR_getpid,
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listener = user_trap_syscall(__NR_getppid,
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SECCOMP_FILTER_FLAG_NEW_LISTENER);
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ASSERT_GE(listener, 0);
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@ -3172,7 +3172,7 @@ TEST(user_notification_kill_in_middle)
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ASSERT_GE(pid, 0);
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if (pid == 0) {
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ret = syscall(__NR_getpid);
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ret = syscall(__NR_getppid);
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exit(ret != USER_NOTIF_MAGIC);
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}
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@ -3282,7 +3282,7 @@ TEST(user_notification_closed_listener)
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TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
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}
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listener = user_trap_syscall(__NR_getpid,
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listener = user_trap_syscall(__NR_getppid,
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SECCOMP_FILTER_FLAG_NEW_LISTENER);
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ASSERT_GE(listener, 0);
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@ -3293,7 +3293,7 @@ TEST(user_notification_closed_listener)
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ASSERT_GE(pid, 0);
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if (pid == 0) {
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close(listener);
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ret = syscall(__NR_getpid);
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ret = syscall(__NR_getppid);
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exit(ret != -1 && errno != ENOSYS);
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}
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@ -3316,14 +3316,15 @@ TEST(user_notification_child_pid_ns)
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ASSERT_EQ(unshare(CLONE_NEWUSER | CLONE_NEWPID), 0);
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listener = user_trap_syscall(__NR_getpid, SECCOMP_FILTER_FLAG_NEW_LISTENER);
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listener = user_trap_syscall(__NR_getppid,
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SECCOMP_FILTER_FLAG_NEW_LISTENER);
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ASSERT_GE(listener, 0);
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pid = fork();
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ASSERT_GE(pid, 0);
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if (pid == 0)
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exit(syscall(__NR_getpid) != USER_NOTIF_MAGIC);
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exit(syscall(__NR_getppid) != USER_NOTIF_MAGIC);
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EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
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EXPECT_EQ(req.pid, pid);
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@ -3355,7 +3356,8 @@ TEST(user_notification_sibling_pid_ns)
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TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
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}
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listener = user_trap_syscall(__NR_getpid, SECCOMP_FILTER_FLAG_NEW_LISTENER);
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listener = user_trap_syscall(__NR_getppid,
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SECCOMP_FILTER_FLAG_NEW_LISTENER);
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ASSERT_GE(listener, 0);
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pid = fork();
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@ -3368,7 +3370,7 @@ TEST(user_notification_sibling_pid_ns)
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ASSERT_GE(pid2, 0);
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if (pid2 == 0)
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exit(syscall(__NR_getpid) != USER_NOTIF_MAGIC);
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exit(syscall(__NR_getppid) != USER_NOTIF_MAGIC);
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EXPECT_EQ(waitpid(pid2, &status, 0), pid2);
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EXPECT_EQ(true, WIFEXITED(status));
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@ -3377,11 +3379,11 @@ TEST(user_notification_sibling_pid_ns)
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}
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/* Create the sibling ns, and sibling in it. */
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EXPECT_EQ(unshare(CLONE_NEWPID), 0);
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EXPECT_EQ(errno, 0);
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ASSERT_EQ(unshare(CLONE_NEWPID), 0);
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ASSERT_EQ(errno, 0);
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pid2 = fork();
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EXPECT_GE(pid2, 0);
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ASSERT_GE(pid2, 0);
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if (pid2 == 0) {
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ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
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@ -3389,7 +3391,7 @@ TEST(user_notification_sibling_pid_ns)
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* The pid should be 0, i.e. the task is in some namespace that
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* we can't "see".
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*/
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ASSERT_EQ(req.pid, 0);
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EXPECT_EQ(req.pid, 0);
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resp.id = req.id;
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resp.error = 0;
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@ -3419,14 +3421,15 @@ TEST(user_notification_fault_recv)
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ASSERT_EQ(unshare(CLONE_NEWUSER), 0);
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listener = user_trap_syscall(__NR_getpid, SECCOMP_FILTER_FLAG_NEW_LISTENER);
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listener = user_trap_syscall(__NR_getppid,
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SECCOMP_FILTER_FLAG_NEW_LISTENER);
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ASSERT_GE(listener, 0);
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pid = fork();
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ASSERT_GE(pid, 0);
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if (pid == 0)
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exit(syscall(__NR_getpid) != USER_NOTIF_MAGIC);
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exit(syscall(__NR_getppid) != USER_NOTIF_MAGIC);
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/* Do a bad recv() */
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EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, NULL), -1);
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