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selftests/bpf: Add test for __nullable suffix in tp_btf

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Add a tracepoint with __nullable suffix in bpf_testmod, and add cases
for it:

$ ./test_progs -t "tp_btf_nullable"
 #406/1   tp_btf_nullable/handle_tp_btf_nullable_bare1:OK
 #406/2   tp_btf_nullable/handle_tp_btf_nullable_bare2:OK
 #406     tp_btf_nullable:OK
 Summary: 1/2 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Philo Lu <lulie@linux.alibaba.com>
Link: https://lore.kernel.org/r/20240911033719.91468-3-lulie@linux.alibaba.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Philo Lu 2024-09-11 11:37:16 +08:00 committed by Martin KaFai Lau
parent 8aeaed21be
commit 2060f07f86
4 changed files with 46 additions and 0 deletions
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6
tools/testing/selftests/bpf/bpf_testmod/bpf_testmod-events.h
View file

@ -34,6 +34,12 @@ DECLARE_TRACE(bpf_testmod_test_write_bare,
TP_ARGS(task, ctx)
);
/* Used in bpf_testmod_test_read() to test __nullable suffix */
DECLARE_TRACE(bpf_testmod_test_nullable_bare,
TP_PROTO(struct bpf_testmod_test_read_ctx *ctx__nullable),
TP_ARGS(ctx__nullable)
);
#undef BPF_TESTMOD_DECLARE_TRACE
#ifdef DECLARE_TRACE_WRITABLE
#define BPF_TESTMOD_DECLARE_TRACE(call, proto, args, size) \

2
tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
View file

@ -356,6 +356,8 @@ bpf_testmod_test_read(struct file *file, struct kobject *kobj,
if (bpf_testmod_loop_test(101) > 100)
trace_bpf_testmod_test_read(current, &ctx);
trace_bpf_testmod_test_nullable_bare(NULL);
/* Magic number to enable writable tp */
if (len == 64) {
struct bpf_testmod_test_writable_ctx writable = {

14
tools/testing/selftests/bpf/prog_tests/tp_btf_nullable.c Normal file
View file

@ -0,0 +1,14 @@
// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include "test_tp_btf_nullable.skel.h"
void test_tp_btf_nullable(void)
{
if (!env.has_testmod) {
test__skip();
return;
}
RUN_TESTS(test_tp_btf_nullable);
}

24
tools/testing/selftests/bpf/progs/test_tp_btf_nullable.c Normal file
View file

@ -0,0 +1,24 @@
// SPDX-License-Identifier: GPL-2.0
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "../bpf_testmod/bpf_testmod.h"
#include "bpf_misc.h"
SEC("tp_btf/bpf_testmod_test_nullable_bare")
__failure __msg("R1 invalid mem access 'trusted_ptr_or_null_'")
int BPF_PROG(handle_tp_btf_nullable_bare1, struct bpf_testmod_test_read_ctx *nullable_ctx)
{
return nullable_ctx->len;
}
SEC("tp_btf/bpf_testmod_test_nullable_bare")
int BPF_PROG(handle_tp_btf_nullable_bare2, struct bpf_testmod_test_read_ctx *nullable_ctx)
{
if (nullable_ctx)
return nullable_ctx->len;
return 0;
}
char _license[] SEC("license") = "GPL";