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b000def2e0
The test_overhead prog_test included an fmod_ret program that attached to
__set_task_comm() in the kernel. However, this function was never listed as
allowed for return modification, so this only worked because of the
verifier skipping tests when a trampoline already existed for the attach
point. Now that the verifier checks have been fixed, remove fmod_ret from
the test so it works again.
Fixes: 4eaf0b5c5e ("selftest/bpf: Fmod_ret prog and implement test_overhead as part of bench")
Acked-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
43 lines
827 B
C
43 lines
827 B
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2019 Facebook */
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#include <stdbool.h>
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#include <stddef.h>
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#include <linux/bpf.h>
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#include <linux/ptrace.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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struct task_struct;
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SEC("kprobe/__set_task_comm")
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int BPF_KPROBE(prog1, struct task_struct *tsk, const char *buf, bool exec)
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{
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return !tsk;
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}
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SEC("kretprobe/__set_task_comm")
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int BPF_KRETPROBE(prog2, int ret)
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{
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return ret;
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}
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SEC("raw_tp/task_rename")
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int prog3(struct bpf_raw_tracepoint_args *ctx)
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{
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return !ctx->args[0];
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}
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SEC("fentry/__set_task_comm")
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int BPF_PROG(prog4, struct task_struct *tsk, const char *buf, bool exec)
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{
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return 0;
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}
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SEC("fexit/__set_task_comm")
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int BPF_PROG(prog5, struct task_struct *tsk, const char *buf, bool exec)
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{
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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