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selftests/bpf: add loop test 4

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Add a test that returns a 'random' number between [0, 2^20)
If state pruning is not working correctly for loop body the number of
processed insns will be 2^20 * num_of_insns_in_loop_body and the program
will be rejected.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Yonghong Song <yhs@fb.com>
This commit is contained in:
Alexei Starovoitov 2019-08-02 15:54:01 -07:00
parent 02bc2b6494
commit a78d0dbec7
2 changed files with 19 additions and 0 deletions
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1
tools/testing/selftests/bpf/prog_tests/bpf_verif_scale.c
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@ -71,6 +71,7 @@ void test_bpf_verif_scale(void)
{ "loop1.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
{ "loop2.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
{ "loop4.o", BPF_PROG_TYPE_SCHED_CLS },
/* partial unroll. 19k insn in a loop.
* Total program size 20.8k insn.

18
tools/testing/selftests/bpf/progs/loop4.c Normal file
View file

@ -0,0 +1,18 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2019 Facebook
#include <linux/bpf.h>
#include "bpf_helpers.h"
char _license[] SEC("license") = "GPL";
SEC("socket")
int combinations(volatile struct __sk_buff* skb)
{
int ret = 0, i;
#pragma nounroll
for (i = 0; i < 20; i++)
if (skb->len)
ret |= 1 << i;
return ret;
}