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bpf: Exercise syscall operations for inode and sk storage 

Use the check_syscall_operations added for task_local_storage to
exercise syscall operations for other local storage maps:

* Check the absence of an element for the given fd.
* Create a new element, retrieve and compare its value.
* Delete the element and check again for absence.

Signed-off-by: KP Singh <kpsingh@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20201106103747.2780972-10-kpsingh@chromium.org
This commit is contained in:
KP Singh 2020-11-06 10:37:47 +00:00 committed by Alexei Starovoitov
parent 9cde3beead
commit 4170bc6baa
1 changed files with 15 additions and 2 deletions
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17
tools/testing/selftests/bpf/prog_tests/test_local_storage.c
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@ -157,7 +157,7 @@ static bool check_syscall_operations(int map_fd, int obj_fd)
void test_test_local_storage(void)
{
char tmp_exec_path[PATH_MAX] = "/tmp/copy_of_rmXXXXXX";
int err, serv_sk = -1, task_fd = -1;
int err, serv_sk = -1, task_fd = -1, rm_fd = -1;
struct local_storage *skel = NULL;
skel = local_storage__open_and_load();
@ -181,6 +181,15 @@ void test_test_local_storage(void)
if (CHECK(err < 0, "copy_rm", "err %d errno %d\n", err, errno))
goto close_prog;
rm_fd = open(tmp_exec_path, O_RDONLY);
if (CHECK(rm_fd < 0, "open", "failed to open %s err:%d, errno:%d",
tmp_exec_path, rm_fd, errno))
goto close_prog;
if (!check_syscall_operations(bpf_map__fd(skel->maps.inode_storage_map),
rm_fd))
goto close_prog;
/* Sets skel->bss->monitored_pid to the pid of the forked child
* forks a child process that executes tmp_exec_path and tries to
* unlink its executable. This operation should be denied by the loaded
@ -209,11 +218,15 @@ void test_test_local_storage(void)
CHECK(skel->data->sk_storage_result != 0, "sk_storage_result",
"sk_local_storage not set\n");
close(serv_sk);
if (!check_syscall_operations(bpf_map__fd(skel->maps.sk_storage_map),
serv_sk))
goto close_prog;
close_prog_unlink:
unlink(tmp_exec_path);
close_prog:
close(serv_sk);
close(rm_fd);
close(task_fd);
local_storage__destroy(skel);
}