One problem with seccomp was that ptrace could be used to change a
syscall after seccomp filtering had completed. This was a well documented
limitation, and it was recommended to block ptrace when defining a filter
to avoid this problem. This can be quite a limitation for containers or
other places where ptrace is desired even under seccomp filters.
This adds tests for both SECCOMP_RET_TRACE and PTRACE_SYSCALL manipulations.
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
---
tools/testing/selftests/seccomp/seccomp_bpf.c | 176 ++++++++++++++++++++++++--
1 file changed, 165 insertions(+), 11 deletions(-)
diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
index 2e58549b2f02..03f1fa495d74 100644
--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -1021,8 +1021,8 @@ void tracer_stop(int sig)
typedef void tracer_func_t(struct __test_metadata *_metadata,
pid_t tracee, int status, void *args);
-void tracer(struct __test_metadata *_metadata, int fd, pid_t tracee,
- tracer_func_t tracer_func, void *args)
+void start_tracer(struct __test_metadata *_metadata, int fd, pid_t tracee,
+ tracer_func_t tracer_func, void *args, bool ptrace_syscall)
{
int ret = -1;
struct sigaction action = {
@@ -1042,12 +1042,16 @@ void tracer(struct __test_metadata *_metadata, int fd, pid_t tracee,
/* Wait for attach stop */
wait(NULL);
- ret = ptrace(PTRACE_SETOPTIONS, tracee, NULL, PTRACE_O_TRACESECCOMP);
+ ret = ptrace(PTRACE_SETOPTIONS, tracee, NULL, ptrace_syscall ?
+ PTRACE_O_TRACESYSGOOD :
+ PTRACE_O_TRACESECCOMP);
ASSERT_EQ(0, ret) {
TH_LOG("Failed to set PTRACE_O_TRACESECCOMP");
kill(tracee, SIGKILL);
}
- ptrace(PTRACE_CONT, tracee, NULL, 0);
+ ret = ptrace(ptrace_syscall ? PTRACE_SYSCALL : PTRACE_CONT,
+ tracee, NULL, 0);
+ ASSERT_EQ(0, ret);
/* Unblock the tracee */
ASSERT_EQ(1, write(fd, "A", 1));
@@ -1063,12 +1067,13 @@ void tracer(struct __test_metadata *_metadata, int fd, pid_t tracee,
/* Child is dead. Time to go. */
return;
- /* Make sure this is a seccomp event. */
- ASSERT_EQ(true, IS_SECCOMP_EVENT(status));
+ /* Check if this is a seccomp event. */
+ ASSERT_EQ(!ptrace_syscall, IS_SECCOMP_EVENT(status));
tracer_func(_metadata, tracee, status, args);
- ret = ptrace(PTRACE_CONT, tracee, NULL, NULL);
+ ret = ptrace(ptrace_syscall ? PTRACE_SYSCALL : PTRACE_CONT,
+ tracee, NULL, 0);
ASSERT_EQ(0, ret);
}
/* Directly report the status of our test harness results. */
@@ -1079,7 +1084,7 @@ void tracer(struct __test_metadata *_metadata, int fd, pid_t tracee,
void cont_handler(int num)
{ }
pid_t setup_trace_fixture(struct __test_metadata *_metadata,
- tracer_func_t func, void *args)
+ tracer_func_t func, void *args, bool ptrace_syscall)
{
char sync;
int pipefd[2];
@@ -1095,7 +1100,8 @@ pid_t setup_trace_fixture(struct __test_metadata *_metadata,
signal(SIGALRM, cont_handler);
if (tracer_pid == 0) {
close(pipefd[0]);
- tracer(_metadata, pipefd[1], tracee, func, args);
+ start_tracer(_metadata, pipefd[1], tracee, func, args,
+ ptrace_syscall);
syscall(__NR_exit, 0);
}
close(pipefd[1]);
@@ -1177,7 +1183,7 @@ FIXTURE_SETUP(TRACE_poke)
/* Launch tracer. */
self->tracer = setup_trace_fixture(_metadata, tracer_poke,
- &self->tracer_args);
+ &self->tracer_args, false);
}
FIXTURE_TEARDOWN(TRACE_poke)
@@ -1399,6 +1405,29 @@ void tracer_syscall(struct __test_metadata *_metadata, pid_t tracee,
}
+void tracer_ptrace(struct __test_metadata *_metadata, pid_t tracee,
+ int status, void *args)
+{
+ int ret, nr;
+ unsigned long msg;
+ static bool entry;
+
+ /* Make sure we got an empty message. */
+ ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
+ EXPECT_EQ(0, ret);
+ EXPECT_EQ(0, msg);
+
+ /* The only way to tell PTRACE_SYSCALL entry/exit is by counting. */
+ entry = !entry;
+ if (!entry)
+ return;
+
+ nr = get_syscall(_metadata, tracee);
+
+ if (nr == __NR_getpid)
+ change_syscall(_metadata, tracee, __NR_getppid);
+}
+
FIXTURE_DATA(TRACE_syscall) {
struct sock_fprog prog;
pid_t tracer, mytid, mypid, parent;
@@ -1440,7 +1469,8 @@ FIXTURE_SETUP(TRACE_syscall)
ASSERT_NE(self->parent, self->mypid);
/* Launch tracer. */
- self->tracer = setup_trace_fixture(_metadata, tracer_syscall, NULL);
+ self->tracer = setup_trace_fixture(_metadata, tracer_syscall, NULL,
+ false);
}
FIXTURE_TEARDOWN(TRACE_syscall)
@@ -1500,6 +1530,130 @@ TEST_F(TRACE_syscall, syscall_dropped)
EXPECT_NE(self->mytid, syscall(__NR_gettid));
}
+TEST_F(TRACE_syscall, skip_after_RET_TRACE)
+{
+ struct sock_filter filter[] = {
+ BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
+ offsetof(struct seccomp_data, nr)),
+ BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
+ BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EPERM),
+ BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
+ };
+ struct sock_fprog prog = {
+ .len = (unsigned short)ARRAY_SIZE(filter),
+ .filter = filter,
+ };
+ long ret;
+
+ ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
+ ASSERT_EQ(0, ret);
+
+ /* Install fixture filter. */
+ ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
+ ASSERT_EQ(0, ret);
+
+ /* Install "errno on getppid" filter. */
+ ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
+ ASSERT_EQ(0, ret);
+
+ /* Tracer will redirect getpid to getppid, and we should see EPERM. */
+ EXPECT_EQ(-1, syscall(__NR_getpid));
+ EXPECT_EQ(EPERM, errno);
+}
+
+TEST_F_SIGNAL(TRACE_syscall, kill_after_RET_TRACE, SIGSYS)
+{
+ struct sock_filter filter[] = {
+ BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
+ offsetof(struct seccomp_data, nr)),
+ BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
+ BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
+ BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
+ };
+ struct sock_fprog prog = {
+ .len = (unsigned short)ARRAY_SIZE(filter),
+ .filter = filter,
+ };
+ long ret;
+
+ ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
+ ASSERT_EQ(0, ret);
+
+ /* Install fixture filter. */
+ ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
+ ASSERT_EQ(0, ret);
+
+ /* Install "death on getppid" filter. */
+ ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
+ ASSERT_EQ(0, ret);
+
+ /* Tracer will redirect getpid to getppid, and we should die. */
+ EXPECT_NE(self->mypid, syscall(__NR_getpid));
+}
+
+TEST_F(TRACE_syscall, skip_after_ptrace)
+{
+ struct sock_filter filter[] = {
+ BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
+ offsetof(struct seccomp_data, nr)),
+ BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
+ BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EPERM),
+ BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
+ };
+ struct sock_fprog prog = {
+ .len = (unsigned short)ARRAY_SIZE(filter),
+ .filter = filter,
+ };
+ long ret;
+
+ /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
+ teardown_trace_fixture(_metadata, self->tracer);
+ self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
+ true);
+
+ ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
+ ASSERT_EQ(0, ret);
+
+ /* Install "errno on getppid" filter. */
+ ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
+ ASSERT_EQ(0, ret);
+
+ /* Tracer will redirect getpid to getppid, and we should see EPERM. */
+ EXPECT_EQ(-1, syscall(__NR_getpid));
+ EXPECT_EQ(EPERM, errno);
+}
+
+TEST_F_SIGNAL(TRACE_syscall, kill_after_ptrace, SIGSYS)
+{
+ struct sock_filter filter[] = {
+ BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
+ offsetof(struct seccomp_data, nr)),
+ BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
+ BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
+ BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
+ };
+ struct sock_fprog prog = {
+ .len = (unsigned short)ARRAY_SIZE(filter),
+ .filter = filter,
+ };
+ long ret;
+
+ /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
+ teardown_trace_fixture(_metadata, self->tracer);
+ self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
+ true);
+
+ ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
+ ASSERT_EQ(0, ret);
+
+ /* Install "death on getppid" filter. */
+ ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
+ ASSERT_EQ(0, ret);
+
+ /* Tracer will redirect getpid to getppid, and we should die. */
+ EXPECT_NE(self->mypid, syscall(__NR_getpid));
+}
+
#ifndef __NR_seccomp
# if defined(__i386__)
# define __NR_seccomp 354
--
2.7.4
