mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-08-05 16:54:27 +00:00
e8763fb66a
Add both positive and negative tests cases using string kfuncs added in
the previous patches.
Positive tests check that the functions work as expected.
Negative tests pass various incorrect strings to the kfuncs and check
for the expected error codes:
-E2BIG when passing too long strings
-EFAULT when trying to read inaccessible kernel memory
-ERANGE when passing userspace pointers on arches with non-overlapping
address spaces
A majority of the tests use the RUN_TESTS helper which executes BPF
programs with BPF_PROG_TEST_RUN and check for the expected return value.
An exception to this are tests for long strings as we need to memset the
long string from userspace (at least I haven't found an ergonomic way to
memset it from a BPF program), which cannot be done using the RUN_TESTS
infrastructure.
Suggested-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Viktor Malik <vmalik@redhat.com>
Link: https://lore.kernel.org/r/090451a2e60c9ae1dceb4d1bfafa3479db5c7481.1750917800.git.vmalik@redhat.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
37 lines
2.1 KiB
C
37 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (C) 2025 Red Hat, Inc.*/
|
|
#include "vmlinux.h"
|
|
#include <bpf/bpf_helpers.h>
|
|
#include "bpf_misc.h"
|
|
#include "errno.h"
|
|
|
|
char str[] = "hello world";
|
|
|
|
#define __test(retval) SEC("syscall") __success __retval(retval)
|
|
|
|
/* Functional tests */
|
|
__test(0) int test_strcmp_eq(void *ctx) { return bpf_strcmp(str, "hello world"); }
|
|
__test(1) int test_strcmp_neq(void *ctx) { return bpf_strcmp(str, "hello"); }
|
|
__test(1) int test_strchr_found(void *ctx) { return bpf_strchr(str, 'e'); }
|
|
__test(11) int test_strchr_null(void *ctx) { return bpf_strchr(str, '\0'); }
|
|
__test(-ENOENT) int test_strchr_notfound(void *ctx) { return bpf_strchr(str, 'x'); }
|
|
__test(1) int test_strchrnul_found(void *ctx) { return bpf_strchrnul(str, 'e'); }
|
|
__test(11) int test_strchrnul_notfound(void *ctx) { return bpf_strchrnul(str, 'x'); }
|
|
__test(1) int test_strnchr_found(void *ctx) { return bpf_strnchr(str, 5, 'e'); }
|
|
__test(11) int test_strnchr_null(void *ctx) { return bpf_strnchr(str, 12, '\0'); }
|
|
__test(-ENOENT) int test_strnchr_notfound(void *ctx) { return bpf_strnchr(str, 5, 'w'); }
|
|
__test(9) int test_strrchr_found(void *ctx) { return bpf_strrchr(str, 'l'); }
|
|
__test(11) int test_strrchr_null(void *ctx) { return bpf_strrchr(str, '\0'); }
|
|
__test(-ENOENT) int test_strrchr_notfound(void *ctx) { return bpf_strrchr(str, 'x'); }
|
|
__test(11) int test_strlen(void *ctx) { return bpf_strlen(str); }
|
|
__test(11) int test_strnlen(void *ctx) { return bpf_strnlen(str, 12); }
|
|
__test(5) int test_strspn(void *ctx) { return bpf_strspn(str, "ehlo"); }
|
|
__test(2) int test_strcspn(void *ctx) { return bpf_strcspn(str, "lo"); }
|
|
__test(6) int test_strstr_found(void *ctx) { return bpf_strstr(str, "world"); }
|
|
__test(-ENOENT) int test_strstr_notfound(void *ctx) { return bpf_strstr(str, "hi"); }
|
|
__test(0) int test_strstr_empty(void *ctx) { return bpf_strstr(str, ""); }
|
|
__test(0) int test_strnstr_found(void *ctx) { return bpf_strnstr(str, "hello", 6); }
|
|
__test(-ENOENT) int test_strnstr_notfound(void *ctx) { return bpf_strnstr(str, "hi", 10); }
|
|
__test(0) int test_strnstr_empty(void *ctx) { return bpf_strnstr(str, "", 1); }
|
|
|
|
char _license[] SEC("license") = "GPL";
|