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selftests/bpf: Add re-attach test to lsm test 

Adding the test to re-attach (detach/attach again) lsm programs,
plus check that already linked program can't be attached again.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210414195147.1624932-6-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2021-04-14 21:51:45 +02:00 committed by Alexei Starovoitov
parent 8caadc43f2
commit cede72ad36
1 changed files with 38 additions and 10 deletions
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48
tools/testing/selftests/bpf/prog_tests/test_lsm.c
View File

@ -18,6 +18,8 @@ char *CMD_ARGS[] = {"true", NULL};
#define GET_PAGE_ADDR(ADDR, PAGE_SIZE) \
(char *)(((unsigned long) (ADDR + PAGE_SIZE)) & ~(PAGE_SIZE-1))
static int duration = 0;
int stack_mprotect(void)
{
void *buf;
@ -51,23 +53,25 @@ int exec_cmd(int *monitored_pid)
return -EINVAL;
}
void test_test_lsm(void)
static int test_lsm(struct lsm *skel)
{
struct lsm *skel = NULL;
int err, duration = 0;
struct bpf_link *link;
int buf = 1234;
skel = lsm__open_and_load();
if (CHECK(!skel, "skel_load", "lsm skeleton failed\n"))
goto close_prog;
int err;
err = lsm__attach(skel);
if (CHECK(err, "attach", "lsm attach failed: %d\n", err))
goto close_prog;
return err;
/* Check that already linked program can't be attached again. */
link = bpf_program__attach(skel->progs.test_int_hook);
if (CHECK(!IS_ERR(link), "attach_link",
"re-attach without detach should not succeed"))
return -1;
err = exec_cmd(&skel->bss->monitored_pid);
if (CHECK(err < 0, "exec_cmd", "err %d errno %d\n", err, errno))
goto close_prog;
return err;
CHECK(skel->bss->bprm_count != 1, "bprm_count", "bprm_count = %d\n",
skel->bss->bprm_count);
@ -77,7 +81,7 @@ void test_test_lsm(void)
err = stack_mprotect();
if (CHECK(errno != EPERM, "stack_mprotect", "want err=EPERM, got %d\n",
errno))
goto close_prog;
return err;
CHECK(skel->bss->mprotect_count != 1, "mprotect_count",
"mprotect_count = %d\n", skel->bss->mprotect_count);
@ -89,6 +93,30 @@ void test_test_lsm(void)
CHECK(skel->bss->copy_test != 3, "copy_test",
"copy_test = %d\n", skel->bss->copy_test);
lsm__detach(skel);
skel->bss->copy_test = 0;
skel->bss->bprm_count = 0;
skel->bss->mprotect_count = 0;
return 0;
}
void test_test_lsm(void)
{
struct lsm *skel = NULL;
int err;
skel = lsm__open_and_load();
if (CHECK(!skel, "lsm_skel_load", "lsm skeleton failed\n"))
goto close_prog;
err = test_lsm(skel);
if (CHECK(err, "test_lsm", "first attach failed\n"))
goto close_prog;
err = test_lsm(skel);
CHECK(err, "test_lsm", "second attach failed\n");
close_prog:
lsm__destroy(skel);
}