[PATCH v4 09/11] selftests/seccomp: Rename user_trap_syscall() to user_notif_syscall()

Kees Cook
2020-06-16T03:26:44Z

The user_trap_syscall() helper creates a filter with
SECCOMP_RET_USER_NOTIF. To avoid confusion with SECCOMP_RET_TRAP, rename
the helper to user_notif_syscall().

Additionally fix a redundant "return" after XFAIL.

Signed-off-by: Kees Cook <keescook@chromium.org>
---
tools/testing/selftests/seccomp/seccomp_bpf.c | 60 +++++++++----------
1 file changed, 29 insertions(+), 31 deletions(-)

diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
index 40ed846744e4..95b134933831 100644
--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -3110,10 +3110,8 @@ TEST(get_metadata)
long ret;

/* Only real root can get metadata. */
- if (geteuid()) {
- XFAIL(return, "get_metadata requires real root");
- return;
- }
+ if (geteuid())
+ XFAIL(return, "get_metadata test requires real root");

ASSERT_EQ(0, pipe(pipefd));

@@ -3170,7 +3168,7 @@ TEST(get_metadata)
ASSERT_EQ(0, kill(pid, SIGKILL));
}

-static int user_trap_syscall(int nr, unsigned int flags)
+static int user_notif_syscall(int nr, unsigned int flags)
{
struct sock_filter filter[] = {
BPF_STMT(BPF_LD+BPF_W+BPF_ABS,
@@ -3216,7 +3214,7 @@ TEST(user_notification_basic)

/* Check that we get -ENOSYS with no listener attached */
if (pid == 0) {
- if (user_trap_syscall(__NR_getppid, 0) < 0)
+ if (user_notif_syscall(__NR_getppid, 0) < 0)
exit(1);
ret = syscall(__NR_getppid);
exit(ret >= 0 || errno != ENOSYS);
@@ -3233,13 +3231,13 @@ TEST(user_notification_basic)
EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0);

/* Check that the basic notification machinery works */
- listener = user_trap_syscall(__NR_getppid,
- SECCOMP_FILTER_FLAG_NEW_LISTENER);
+ listener = user_notif_syscall(__NR_getppid,
+ SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);

/* Installing a second listener in the chain should EBUSY */
- EXPECT_EQ(user_trap_syscall(__NR_getppid,
- SECCOMP_FILTER_FLAG_NEW_LISTENER),
+ EXPECT_EQ(user_notif_syscall(__NR_getppid,
+ SECCOMP_FILTER_FLAG_NEW_LISTENER),
-1);
EXPECT_EQ(errno, EBUSY);

@@ -3303,12 +3301,12 @@ TEST(user_notification_with_tsync)
/* these were exclusive */
flags = SECCOMP_FILTER_FLAG_NEW_LISTENER |
SECCOMP_FILTER_FLAG_TSYNC;
- ASSERT_EQ(-1, user_trap_syscall(__NR_getppid, flags));
+ ASSERT_EQ(-1, user_notif_syscall(__NR_getppid, flags));
ASSERT_EQ(EINVAL, errno);

/* but now they're not */
flags |= SECCOMP_FILTER_FLAG_TSYNC_ESRCH;
- ret = user_trap_syscall(__NR_getppid, flags);
+ ret = user_notif_syscall(__NR_getppid, flags);
close(ret);
ASSERT_LE(0, ret);
}
@@ -3326,8 +3324,8 @@ TEST(user_notification_kill_in_middle)
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
}

- listener = user_trap_syscall(__NR_getppid,
- SECCOMP_FILTER_FLAG_NEW_LISTENER);
+ listener = user_notif_syscall(__NR_getppid,
+ SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);

/*
@@ -3380,8 +3378,8 @@ TEST(user_notification_signal)

ASSERT_EQ(socketpair(PF_LOCAL, SOCK_SEQPACKET, 0, sk_pair), 0);

- listener = user_trap_syscall(__NR_gettid,
- SECCOMP_FILTER_FLAG_NEW_LISTENER);
+ listener = user_notif_syscall(__NR_gettid,
+ SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);

pid = fork();
@@ -3450,8 +3448,8 @@ TEST(user_notification_closed_listener)
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
}

- listener = user_trap_syscall(__NR_getppid,
- SECCOMP_FILTER_FLAG_NEW_LISTENER);
+ listener = user_notif_syscall(__NR_getppid,
+ SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);

/*
@@ -3484,8 +3482,8 @@ TEST(user_notification_child_pid_ns)

ASSERT_EQ(unshare(CLONE_NEWUSER | CLONE_NEWPID), 0);

- listener = user_trap_syscall(__NR_getppid,
- SECCOMP_FILTER_FLAG_NEW_LISTENER);
+ listener = user_notif_syscall(__NR_getppid,
+ SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);

pid = fork();
@@ -3524,8 +3522,8 @@ TEST(user_notification_sibling_pid_ns)
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
}

- listener = user_trap_syscall(__NR_getppid,
- SECCOMP_FILTER_FLAG_NEW_LISTENER);
+ listener = user_notif_syscall(__NR_getppid,
+ SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);

pid = fork();
@@ -3589,8 +3587,8 @@ TEST(user_notification_fault_recv)

ASSERT_EQ(unshare(CLONE_NEWUSER), 0);

- listener = user_trap_syscall(__NR_getppid,
- SECCOMP_FILTER_FLAG_NEW_LISTENER);
+ listener = user_notif_syscall(__NR_getppid,
+ SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);

pid = fork();
@@ -3641,7 +3639,7 @@ TEST(user_notification_continue)
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
}

- listener = user_trap_syscall(__NR_dup, SECCOMP_FILTER_FLAG_NEW_LISTENER);
+ listener = user_notif_syscall(__NR_dup, SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);

pid = fork();
@@ -3736,7 +3734,7 @@ TEST(user_notification_filter_empty)
if (pid == 0) {
int listener;

- listener = user_trap_syscall(__NR_mknod, SECCOMP_FILTER_FLAG_NEW_LISTENER);
+ listener = user_notif_syscall(__NR_mknod, SECCOMP_FILTER_FLAG_NEW_LISTENER);
if (listener < 0)
_exit(EXIT_FAILURE);

@@ -3792,7 +3790,7 @@ TEST(user_notification_filter_empty_threaded)
int listener, status;
pthread_t thread;

- listener = user_trap_syscall(__NR_dup, SECCOMP_FILTER_FLAG_NEW_LISTENER);
+ listener = user_notif_syscall(__NR_dup, SECCOMP_FILTER_FLAG_NEW_LISTENER);
if (listener < 0)
_exit(EXIT_FAILURE);

@@ -3869,8 +3867,8 @@ TEST(user_notification_sendfd)
}

/* Check that the basic notification machinery works */
- listener = user_trap_syscall(__NR_getppid,
- SECCOMP_FILTER_FLAG_NEW_LISTENER);
+ listener = user_notif_syscall(__NR_getppid,
+ SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);

pid = fork();
@@ -3993,8 +3991,8 @@ TEST(user_notification_sendfd_rlimit)
}

/* Check that the basic notification machinery works */
- listener = user_trap_syscall(__NR_getppid,
- SECCOMP_FILTER_FLAG_NEW_LISTENER);
+ listener = user_notif_syscall(__NR_getppid,
+ SECCOMP_FILTER_FLAG_NEW_LISTENER);
ASSERT_GE(listener, 0);

pid = fork();
--
2.25.1