diff options
Diffstat (limited to 'tools/testing/selftests/seccomp/seccomp_bpf.c')
| -rw-r--r-- | tools/testing/selftests/seccomp/seccomp_bpf.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c index 313bb0cbfb1e..4da905180f89 100644 --- a/tools/testing/selftests/seccomp/seccomp_bpf.c +++ b/tools/testing/selftests/seccomp/seccomp_bpf.c @@ -46,6 +46,7 @@ #include <sys/ioctl.h> #include <linux/kcmp.h> #include <sys/resource.h> +#include <sys/capability.h> #include <unistd.h> #include <sys/syscall.h> @@ -4231,6 +4232,68 @@ TEST(user_notification_addfd_rlimit) close(memfd); } +/* Make sure PTRACE_O_SUSPEND_SECCOMP requires CAP_SYS_ADMIN. */ +FIXTURE(O_SUSPEND_SECCOMP) { + pid_t pid; +}; + +FIXTURE_SETUP(O_SUSPEND_SECCOMP) +{ + ERRNO_FILTER(block_read, E2BIG); + cap_value_t cap_list[] = { CAP_SYS_ADMIN }; + cap_t caps; + + self->pid = 0; + + /* make sure we don't have CAP_SYS_ADMIN */ + caps = cap_get_proc(); + ASSERT_NE(NULL, caps); + ASSERT_EQ(0, cap_set_flag(caps, CAP_EFFECTIVE, 1, cap_list, CAP_CLEAR)); + ASSERT_EQ(0, cap_set_proc(caps)); + cap_free(caps); + + ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)); + ASSERT_EQ(0, prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_block_read)); + + self->pid = fork(); + ASSERT_GE(self->pid, 0); + + if (self->pid == 0) { + while (1) + pause(); + _exit(127); + } +} + +FIXTURE_TEARDOWN(O_SUSPEND_SECCOMP) +{ + if (self->pid) + kill(self->pid, SIGKILL); +} + +TEST_F(O_SUSPEND_SECCOMP, setoptions) +{ + int wstatus; + + ASSERT_EQ(0, ptrace(PTRACE_ATTACH, self->pid, NULL, 0)); + ASSERT_EQ(self->pid, wait(&wstatus)); + ASSERT_EQ(-1, ptrace(PTRACE_SETOPTIONS, self->pid, NULL, PTRACE_O_SUSPEND_SECCOMP)); + if (errno == EINVAL) + SKIP(return, "Kernel does not support PTRACE_O_SUSPEND_SECCOMP (missing CONFIG_CHECKPOINT_RESTORE?)"); + ASSERT_EQ(EPERM, errno); +} + +TEST_F(O_SUSPEND_SECCOMP, seize) +{ + int ret; + + ret = ptrace(PTRACE_SEIZE, self->pid, NULL, PTRACE_O_SUSPEND_SECCOMP); + ASSERT_EQ(-1, ret); + if (errno == EINVAL) + SKIP(return, "Kernel does not support PTRACE_O_SUSPEND_SECCOMP (missing CONFIG_CHECKPOINT_RESTORE?)"); + ASSERT_EQ(EPERM, errno); +} + /* * TODO: * - expand NNP testing |