d923021c2c
Add two tests for PTR_TO_BTF_ID vs. null ptr comparison,
one for PTR_TO_BTF_ID in the ctx structure and the
other for PTR_TO_BTF_ID after one level pointer chasing.
In both cases, the test ensures condition is not
removed.
For example, for this test
struct bpf_fentry_test_t {
struct bpf_fentry_test_t *a;
};
int BPF_PROG(test7, struct bpf_fentry_test_t *arg)
{
if (arg == 0)
test7_result = 1;
return 0;
}
Before the previous verifier change, we have xlated codes:
int test7(long long unsigned int * ctx):
; int BPF_PROG(test7, struct bpf_fentry_test_t *arg)
0: (79) r1 = *(u64 *)(r1 +0)
; int BPF_PROG(test7, struct bpf_fentry_test_t *arg)
1: (b4) w0 = 0
2: (95) exit
After the previous verifier change, we have:
int test7(long long unsigned int * ctx):
; int BPF_PROG(test7, struct bpf_fentry_test_t *arg)
0: (79) r1 = *(u64 *)(r1 +0)
; if (arg == 0)
1: (55) if r1 != 0x0 goto pc+4
; test7_result = 1;
2: (18) r1 = map[id:6][0]+48
4: (b7) r2 = 1
5: (7b) *(u64 *)(r1 +0) = r2
; int BPF_PROG(test7, struct bpf_fentry_test_t *arg)
6: (b4) w0 = 0
7: (95) exit
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200630171241.2523875-1-yhs@fb.com
79 lines
1.6 KiB
C
79 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2019 Facebook */
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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char _license[] SEC("license") = "GPL";
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__u64 test1_result = 0;
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SEC("fentry/bpf_fentry_test1")
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int BPF_PROG(test1, int a)
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{
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test1_result = a == 1;
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return 0;
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}
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__u64 test2_result = 0;
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SEC("fentry/bpf_fentry_test2")
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int BPF_PROG(test2, int a, __u64 b)
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{
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test2_result = a == 2 && b == 3;
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return 0;
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}
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__u64 test3_result = 0;
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SEC("fentry/bpf_fentry_test3")
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int BPF_PROG(test3, char a, int b, __u64 c)
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{
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test3_result = a == 4 && b == 5 && c == 6;
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return 0;
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}
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__u64 test4_result = 0;
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SEC("fentry/bpf_fentry_test4")
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int BPF_PROG(test4, void *a, char b, int c, __u64 d)
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{
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test4_result = a == (void *)7 && b == 8 && c == 9 && d == 10;
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return 0;
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}
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__u64 test5_result = 0;
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SEC("fentry/bpf_fentry_test5")
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int BPF_PROG(test5, __u64 a, void *b, short c, int d, __u64 e)
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{
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test5_result = a == 11 && b == (void *)12 && c == 13 && d == 14 &&
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e == 15;
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return 0;
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}
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__u64 test6_result = 0;
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SEC("fentry/bpf_fentry_test6")
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int BPF_PROG(test6, __u64 a, void *b, short c, int d, void * e, __u64 f)
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{
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test6_result = a == 16 && b == (void *)17 && c == 18 && d == 19 &&
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e == (void *)20 && f == 21;
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return 0;
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}
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struct bpf_fentry_test_t {
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struct bpf_fentry_test_t *a;
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};
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__u64 test7_result = 0;
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SEC("fentry/bpf_fentry_test7")
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int BPF_PROG(test7, struct bpf_fentry_test_t *arg)
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{
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if (arg == 0)
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test7_result = 1;
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return 0;
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}
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__u64 test8_result = 0;
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SEC("fentry/bpf_fentry_test8")
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int BPF_PROG(test8, struct bpf_fentry_test_t *arg)
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{
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if (arg->a == 0)
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test8_result = 1;
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return 0;
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}
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