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selftests/bpf: Test verifier log for global percpu data

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Add two tests to verify the verifier log
"R%d points to percpu_array map which cannot be used as const string\n".

Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/bpf/20260813152324.97937-10-leon.hwang@linux.dev
This commit is contained in:
Leon Hwang
2026-08-13 23:23:22 +08:00
committed by Andrii Nakryiko
parent 3993d5beef
commit 1ed2294b31
2 changed files with 29 additions and 0 deletions
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6
tools/testing/selftests/bpf/prog_tests/global_data_init.c
View File

@@ -322,6 +322,11 @@ static void test_global_percpu_data_rdonly_direct_write(void)
close(map_fd);
}
static void test_global_percpu_data_verifier_log(void)
{
RUN_TESTS(test_global_percpu_data);
}
void test_global_percpu_data(void)
{
if (!feat_supported(NULL, FEAT_PERCPU_DATA)) {
@@ -337,4 +342,5 @@ void test_global_percpu_data(void)
test_global_percpu_data_rdonly_direct_read();
if (test__start_subtest("rdonly_direct_write"))
test_global_percpu_data_rdonly_direct_write();
test_global_percpu_data_verifier_log();
}

23
tools/testing/selftests/bpf/progs/test_global_percpu_data.c
View File

@@ -38,4 +38,27 @@ int update_percpu_data(void *ctx)
return 0;
}
static const char fmt[] SEC(".percpu.fmt") = "data %d\n";
SEC("?kprobe")
__failure __msg("R{{[0-9]+}} points to percpu_array map which cannot be used as const string")
int verifier_strncmp(void *ctx)
{
return bpf_strncmp("test", 5, fmt);
}
SEC("?kprobe")
__failure __msg("R{{[0-9]+}} points to percpu_array map which cannot be used as const string")
int verifier_snprintf(void *ctx)
{
u64 args[] = { data };
char buf[128];
int len;
len = bpf_snprintf(buf, sizeof(buf), fmt, args, sizeof(args));
if (len > 0)
bpf_printk("snprintf: %s\n", buf);
return 0;
}
char _license[] SEC("license") = "GPL";