selftests/bpf: add loop test 4
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>
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@ -71,6 +71,7 @@ void test_bpf_verif_scale(void)
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{ "loop1.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
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{ "loop1.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
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{ "loop2.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
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{ "loop2.o", BPF_PROG_TYPE_RAW_TRACEPOINT },
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{ "loop4.o", BPF_PROG_TYPE_SCHED_CLS },
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/* partial unroll. 19k insn in a loop.
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/* partial unroll. 19k insn in a loop.
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* Total program size 20.8k insn.
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* Total program size 20.8k insn.
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18
tools/testing/selftests/bpf/progs/loop4.c
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18
tools/testing/selftests/bpf/progs/loop4.c
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@ -0,0 +1,18 @@
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// 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_helpers.h"
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char _license[] SEC("license") = "GPL";
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SEC("socket")
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int combinations(volatile struct __sk_buff* skb)
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{
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int ret = 0, i;
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#pragma nounroll
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for (i = 0; i < 20; i++)
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if (skb->len)
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ret |= 1 << i;
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return ret;
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}
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