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selftests/seccomp: Add tests for basic ptrace actions

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This adds tests for using only ptrace to perform syscall changes, just
to validate matching behavior between seccomp events and ptrace events.

Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2016-08-08 17:46:23 -07:00
parent 520eccdfe1
commit a33b2d0359
1 changed files with 34 additions and 7 deletions
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41
tools/testing/selftests/seccomp/seccomp_bpf.c
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@ -1262,6 +1262,13 @@ TEST_F(TRACE_poke, getpid_runs_normally)
# error "Do not know how to find your architecture's registers and syscalls" # error "Do not know how to find your architecture's registers and syscalls"
#endif #endif
/* When the syscall return can't be changed, stub out the tests for it. */
#ifdef SYSCALL_NUM_RET_SHARE_REG
# define EXPECT_SYSCALL_RETURN(val, action) EXPECT_EQ(-1, action)
#else
# define EXPECT_SYSCALL_RETURN(val, action) EXPECT_EQ(val, action)
#endif
/* Use PTRACE_GETREGS and PTRACE_SETREGS when available. This is useful for /* Use PTRACE_GETREGS and PTRACE_SETREGS when available. This is useful for
* architectures without HAVE_ARCH_TRACEHOOK (e.g. User-mode Linux). * architectures without HAVE_ARCH_TRACEHOOK (e.g. User-mode Linux).
*/ */
@ -1357,7 +1364,7 @@ void change_syscall(struct __test_metadata *_metadata,
#ifdef SYSCALL_NUM_RET_SHARE_REG #ifdef SYSCALL_NUM_RET_SHARE_REG
TH_LOG("Can't modify syscall return on this architecture"); TH_LOG("Can't modify syscall return on this architecture");
#else #else
regs.SYSCALL_RET = 1; regs.SYSCALL_RET = EPERM;
#endif #endif
#ifdef HAVE_GETREGS #ifdef HAVE_GETREGS
@ -1426,6 +1433,8 @@ void tracer_ptrace(struct __test_metadata *_metadata, pid_t tracee,
if (nr == __NR_getpid) if (nr == __NR_getpid)
change_syscall(_metadata, tracee, __NR_getppid); change_syscall(_metadata, tracee, __NR_getppid);
if (nr == __NR_open)
change_syscall(_metadata, tracee, -1);
} }
FIXTURE_DATA(TRACE_syscall) { FIXTURE_DATA(TRACE_syscall) {
@ -1480,6 +1489,28 @@ FIXTURE_TEARDOWN(TRACE_syscall)
free(self->prog.filter); free(self->prog.filter);
} }
TEST_F(TRACE_syscall, ptrace_syscall_redirected)
{
/* 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);
/* Tracer will redirect getpid to getppid. */
EXPECT_NE(self->mypid, syscall(__NR_getpid));
}
TEST_F(TRACE_syscall, ptrace_syscall_dropped)
{
/* 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);
/* Tracer should skip the open syscall, resulting in EPERM. */
EXPECT_SYSCALL_RETURN(EPERM, syscall(__NR_open));
}
TEST_F(TRACE_syscall, syscall_allowed) TEST_F(TRACE_syscall, syscall_allowed)
{ {
long ret; long ret;
@ -1520,13 +1551,8 @@ TEST_F(TRACE_syscall, syscall_dropped)
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
ASSERT_EQ(0, ret); ASSERT_EQ(0, ret);
#ifdef SYSCALL_NUM_RET_SHARE_REG
/* gettid has been skipped */
EXPECT_EQ(-1, syscall(__NR_gettid));
#else
/* gettid has been skipped and an altered return value stored. */ /* gettid has been skipped and an altered return value stored. */
EXPECT_EQ(1, syscall(__NR_gettid)); EXPECT_SYSCALL_RETURN(EPERM, syscall(__NR_gettid));
#endif
EXPECT_NE(self->mytid, syscall(__NR_gettid)); EXPECT_NE(self->mytid, syscall(__NR_gettid));
} }
@ -1557,6 +1583,7 @@ TEST_F(TRACE_syscall, skip_after_RET_TRACE)
ASSERT_EQ(0, ret); ASSERT_EQ(0, ret);
/* Tracer will redirect getpid to getppid, and we should see EPERM. */ /* Tracer will redirect getpid to getppid, and we should see EPERM. */
errno = 0;
EXPECT_EQ(-1, syscall(__NR_getpid)); EXPECT_EQ(-1, syscall(__NR_getpid));
EXPECT_EQ(EPERM, errno); EXPECT_EQ(EPERM, errno);
} }