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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>
23 lines
1.4 KiB
C
23 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2025 Red Hat, Inc.*/
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include <linux/limits.h>
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char long_str[XATTR_SIZE_MAX + 1];
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SEC("syscall") int test_strcmp_too_long(void *ctx) { return bpf_strcmp(long_str, long_str); }
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SEC("syscall") int test_strchr_too_long(void *ctx) { return bpf_strchr(long_str, 'b'); }
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SEC("syscall") int test_strchrnul_too_long(void *ctx) { return bpf_strchrnul(long_str, 'b'); }
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SEC("syscall") int test_strnchr_too_long(void *ctx) { return bpf_strnchr(long_str, sizeof(long_str), 'b'); }
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SEC("syscall") int test_strrchr_too_long(void *ctx) { return bpf_strrchr(long_str, 'b'); }
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SEC("syscall") int test_strlen_too_long(void *ctx) { return bpf_strlen(long_str); }
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SEC("syscall") int test_strnlen_too_long(void *ctx) { return bpf_strnlen(long_str, sizeof(long_str)); }
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SEC("syscall") int test_strspn_str_too_long(void *ctx) { return bpf_strspn(long_str, "a"); }
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SEC("syscall") int test_strspn_accept_too_long(void *ctx) { return bpf_strspn("b", long_str); }
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SEC("syscall") int test_strcspn_str_too_long(void *ctx) { return bpf_strcspn(long_str, "b"); }
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SEC("syscall") int test_strcspn_reject_too_long(void *ctx) { return bpf_strcspn("b", long_str); }
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SEC("syscall") int test_strstr_too_long(void *ctx) { return bpf_strstr(long_str, "hello"); }
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SEC("syscall") int test_strnstr_too_long(void *ctx) { return bpf_strnstr(long_str, "hello", sizeof(long_str)); }
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char _license[] SEC("license") = "GPL";
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