mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-05 00:20:32 +00:00
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
49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2019 Facebook */
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#include <test_progs.h>
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#include "fentry_test.skel.h"
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#include "fexit_test.skel.h"
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void test_fentry_fexit(void)
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{
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struct fentry_test *fentry_skel = NULL;
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struct fexit_test *fexit_skel = NULL;
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__u64 *fentry_res, *fexit_res;
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__u32 duration = 0, retval;
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int err, prog_fd, i;
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fentry_skel = fentry_test__open_and_load();
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if (CHECK(!fentry_skel, "fentry_skel_load", "fentry skeleton failed\n"))
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goto close_prog;
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fexit_skel = fexit_test__open_and_load();
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if (CHECK(!fexit_skel, "fexit_skel_load", "fexit skeleton failed\n"))
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goto close_prog;
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err = fentry_test__attach(fentry_skel);
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if (CHECK(err, "fentry_attach", "fentry attach failed: %d\n", err))
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goto close_prog;
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err = fexit_test__attach(fexit_skel);
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if (CHECK(err, "fexit_attach", "fexit attach failed: %d\n", err))
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goto close_prog;
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prog_fd = bpf_program__fd(fexit_skel->progs.test1);
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err = bpf_prog_test_run(prog_fd, 1, NULL, 0,
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NULL, NULL, &retval, &duration);
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CHECK(err || retval, "ipv6",
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"err %d errno %d retval %d duration %d\n",
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err, errno, retval, duration);
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fentry_res = (__u64 *)fentry_skel->bss;
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fexit_res = (__u64 *)fexit_skel->bss;
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printf("%lld\n", fentry_skel->bss->test1_result);
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for (i = 0; i < 8; i++) {
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CHECK(fentry_res[i] != 1, "result",
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"fentry_test%d failed err %lld\n", i + 1, fentry_res[i]);
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CHECK(fexit_res[i] != 1, "result",
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"fexit_test%d failed err %lld\n", i + 1, fexit_res[i]);
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}
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close_prog:
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fentry_test__destroy(fentry_skel);
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fexit_test__destroy(fexit_skel);
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}
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