mirror of
https://github.com/torvalds/linux
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eddbe8e652
Add a selftest for commit e21aa34178 ("bpf: Fix fexit trampoline.")
to make sure that attaching fexit prog to a sleeping kernel function
will trigger appropriate trampoline and program destruction.
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210318004523.55908-1-alexei.starovoitov@gmail.com
32 lines
612 B
C
32 lines
612 B
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2021 Facebook */
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#include "vmlinux.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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int pid = 0;
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int fentry_cnt = 0;
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int fexit_cnt = 0;
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SEC("fentry/__x64_sys_nanosleep")
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int BPF_PROG(nanosleep_fentry, const struct pt_regs *regs)
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{
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if ((int)bpf_get_current_pid_tgid() != pid)
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return 0;
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fentry_cnt++;
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return 0;
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}
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SEC("fexit/__x64_sys_nanosleep")
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int BPF_PROG(nanosleep_fexit, const struct pt_regs *regs, int ret)
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{
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if ((int)bpf_get_current_pid_tgid() != pid)
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return 0;
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fexit_cnt++;
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return 0;
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}
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