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selftests/bpf: Check stack_mprotect() return value 

If stack_mprotect() succeeds, errno is not changed. This can produce
misleading error messages, that show stale errno.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Link: https://lore.kernel.org/r/20230128000650.1516334-13-iii@linux.ibm.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Ilya Leoshkevich 2023-01-28 01:06:31 +01:00 committed by Alexei Starovoitov
parent 06cea99e68
commit 2934565f04
2 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
View File

@ -472,6 +472,7 @@ static void lsm_subtest(struct test_bpf_cookie *skel)
int prog_fd;
int lsm_fd = -1;
LIBBPF_OPTS(bpf_link_create_opts, link_opts);
int err;
skel->bss->lsm_res = 0;
@ -482,8 +483,9 @@ static void lsm_subtest(struct test_bpf_cookie *skel)
if (!ASSERT_GE(lsm_fd, 0, "lsm.link_create"))
goto cleanup;
stack_mprotect();
if (!ASSERT_EQ(errno, EPERM, "stack_mprotect"))
err = stack_mprotect();
if (!ASSERT_EQ(err, -1, "stack_mprotect") ||
!ASSERT_EQ(errno, EPERM, "stack_mprotect"))
goto cleanup;
usleep(1);

3
tools/testing/selftests/bpf/prog_tests/test_lsm.c
View File

@ -75,7 +75,8 @@ static int test_lsm(struct lsm *skel)
skel->bss->monitored_pid = getpid();
err = stack_mprotect();
if (!ASSERT_EQ(errno, EPERM, "stack_mprotect"))
if (!ASSERT_EQ(err, -1, "stack_mprotect") ||
!ASSERT_EQ(errno, EPERM, "stack_mprotect"))
return err;
ASSERT_EQ(skel->bss->mprotect_count, 1, "mprotect_count");