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author | 2020-09-08 12:28:27 -0700 | |
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committer | 2020-09-08 16:26:07 -0700 | |
commit | 3932fcecd96221e18100055d623b736d0ff873a4 (patch) | |
tree | a559352c6abf73ee7887746f2d06bcd5ef896e68 /tools/testing/selftests/seccomp | |
parent | seccomp: kill process instead of thread for unknown actions (diff) | |
download | linux-3932fcecd96221e18100055d623b736d0ff873a4.tar.gz linux-3932fcecd96221e18100055d623b736d0ff873a4.tar.bz2 linux-3932fcecd96221e18100055d623b736d0ff873a4.zip |
selftests/seccomp: Add test for unknown SECCOMP_RET kill behavior
While we were testing for the behavior of unknown seccomp filter return
values, there was no test for how it acted in a thread group. Add a test
in the thread group tests for this.
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'tools/testing/selftests/seccomp')
-rw-r--r-- | tools/testing/selftests/seccomp/seccomp_bpf.c | 43 |
1 files changed, 37 insertions, 6 deletions
diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c index 7a6d40286a42..bfb382580493 100644 --- a/tools/testing/selftests/seccomp/seccomp_bpf.c +++ b/tools/testing/selftests/seccomp/seccomp_bpf.c @@ -774,8 +774,15 @@ void *kill_thread(void *data) return (void *)SIBLING_EXIT_UNKILLED; } +enum kill_t { + KILL_THREAD, + KILL_PROCESS, + RET_UNKNOWN +}; + /* Prepare a thread that will kill itself or both of us. */ -void kill_thread_or_group(struct __test_metadata *_metadata, bool kill_process) +void kill_thread_or_group(struct __test_metadata *_metadata, + enum kill_t kill_how) { pthread_t thread; void *status; @@ -791,11 +798,12 @@ void kill_thread_or_group(struct __test_metadata *_metadata, bool kill_process) .len = (unsigned short)ARRAY_SIZE(filter_thread), .filter = filter_thread, }; + int kill = kill_how == KILL_PROCESS ? SECCOMP_RET_KILL_PROCESS : 0xAAAAAAAAA; struct sock_filter filter_process[] = { BPF_STMT(BPF_LD|BPF_W|BPF_ABS, offsetof(struct seccomp_data, nr)), BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1), - BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL_PROCESS), + BPF_STMT(BPF_RET|BPF_K, kill), BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), }; struct sock_fprog prog_process = { @@ -808,13 +816,15 @@ void kill_thread_or_group(struct __test_metadata *_metadata, bool kill_process) } ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0, - kill_process ? &prog_process : &prog_thread)); + kill_how == KILL_THREAD ? &prog_thread + : &prog_process)); /* * Add the KILL_THREAD rule again to make sure that the KILL_PROCESS * flag cannot be downgraded by a new filter. */ - ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog_thread)); + if (kill_how == KILL_PROCESS) + ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog_thread)); /* Start a thread that will exit immediately. */ ASSERT_EQ(0, pthread_create(&thread, NULL, kill_thread, (void *)false)); @@ -842,7 +852,7 @@ TEST(KILL_thread) child_pid = fork(); ASSERT_LE(0, child_pid); if (child_pid == 0) { - kill_thread_or_group(_metadata, false); + kill_thread_or_group(_metadata, KILL_THREAD); _exit(38); } @@ -861,7 +871,7 @@ TEST(KILL_process) child_pid = fork(); ASSERT_LE(0, child_pid); if (child_pid == 0) { - kill_thread_or_group(_metadata, true); + kill_thread_or_group(_metadata, KILL_PROCESS); _exit(38); } @@ -872,6 +882,27 @@ TEST(KILL_process) ASSERT_EQ(SIGSYS, WTERMSIG(status)); } +TEST(KILL_unknown) +{ + int status; + pid_t child_pid; + + child_pid = fork(); + ASSERT_LE(0, child_pid); + if (child_pid == 0) { + kill_thread_or_group(_metadata, RET_UNKNOWN); + _exit(38); + } + + ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); + + /* If the entire process was killed, we'll see SIGSYS. */ + EXPECT_TRUE(WIFSIGNALED(status)) { + TH_LOG("Unknown SECCOMP_RET is only killing the thread?"); + } + ASSERT_EQ(SIGSYS, WTERMSIG(status)); +} + /* TODO(wad) add 64-bit versus 32-bit arg tests. */ TEST(arg_out_of_range) { |