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selftests/bpf: Add test to access u32 ptr argument in tracing program

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Adding verifier test for accessing u32 pointer argument in
tracing programs.

The test program loads 1nd argument of bpf_fentry_test9 function
which is u32 pointer and checks that verifier allows that.

Co-developed-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Feng Zhou <zhoufeng.zf@bytedance.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/bpf/20230410085908.98493-3-zhoufeng.zf@bytedance.com
This commit is contained in:
Feng Zhou 2023-04-10 16:59:08 +08:00 committed by Daniel Borkmann
parent 91f2dc6838
commit 75dcef8d36
2 changed files with 20 additions and 1 deletions
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8
net/bpf/test_run.c
View File

@ -541,6 +541,11 @@ int noinline bpf_fentry_test8(struct bpf_fentry_test_t *arg)
return (long)arg->a;
}
__bpf_kfunc u32 bpf_fentry_test9(u32 *a)
{
return *a;
}
__bpf_kfunc int bpf_modify_return_test(int a, int *b)
{
*b += 1;
@ -855,7 +860,8 @@ int bpf_prog_test_run_tracing(struct bpf_prog *prog,
bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 ||
bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111 ||
bpf_fentry_test7((struct bpf_fentry_test_t *)0) != 0 ||
bpf_fentry_test8(&arg) != 0)
bpf_fentry_test8(&arg) != 0 ||
bpf_fentry_test9(&retval) != 0)
goto out;
break;
case BPF_MODIFY_RETURN:

13
tools/testing/selftests/bpf/verifier/btf_ctx_access.c
View File

@ -10,3 +10,16 @@
.expected_attach_type = BPF_TRACE_FENTRY,
.kfunc = "bpf_modify_return_test",
},
{
"btf_ctx_access u32 pointer accept",
.insns = {
BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1, 0), /* load 1nd argument value (u32 pointer) */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_TRACING,
.expected_attach_type = BPF_TRACE_FENTRY,
.kfunc = "bpf_fentry_test9",
},