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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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02f47faa25
The test is reading UAPI kernel structure from user-space. So it doesn't need
CO-RE relocations and has to use bpf_probe_read_user().
Fixes: acbd06206b ("selftests/bpf: Add vmlinux.h selftest exercising tracing of syscalls")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200818213356.2629020-6-andriin@fb.com
90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020 Facebook */
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#include "vmlinux.h"
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#include <asm/unistd.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include <bpf/bpf_core_read.h>
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#define MY_TV_NSEC 1337
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bool tp_called = false;
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bool raw_tp_called = false;
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bool tp_btf_called = false;
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bool kprobe_called = false;
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bool fentry_called = false;
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SEC("tp/syscalls/sys_enter_nanosleep")
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int handle__tp(struct trace_event_raw_sys_enter *args)
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{
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struct __kernel_timespec *ts;
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long tv_nsec;
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if (args->id != __NR_nanosleep)
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return 0;
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ts = (void *)args->args[0];
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if (bpf_probe_read_user(&tv_nsec, sizeof(ts->tv_nsec), &ts->tv_nsec) ||
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tv_nsec != MY_TV_NSEC)
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return 0;
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tp_called = true;
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return 0;
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}
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SEC("raw_tp/sys_enter")
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int BPF_PROG(handle__raw_tp, struct pt_regs *regs, long id)
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{
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struct __kernel_timespec *ts;
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long tv_nsec;
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if (id != __NR_nanosleep)
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return 0;
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ts = (void *)PT_REGS_PARM1_CORE(regs);
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if (bpf_probe_read_user(&tv_nsec, sizeof(ts->tv_nsec), &ts->tv_nsec) ||
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tv_nsec != MY_TV_NSEC)
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return 0;
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raw_tp_called = true;
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return 0;
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}
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SEC("tp_btf/sys_enter")
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int BPF_PROG(handle__tp_btf, struct pt_regs *regs, long id)
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{
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struct __kernel_timespec *ts;
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long tv_nsec;
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if (id != __NR_nanosleep)
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return 0;
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ts = (void *)PT_REGS_PARM1_CORE(regs);
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if (bpf_probe_read_user(&tv_nsec, sizeof(ts->tv_nsec), &ts->tv_nsec) ||
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tv_nsec != MY_TV_NSEC)
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return 0;
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tp_btf_called = true;
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return 0;
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}
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SEC("kprobe/hrtimer_start_range_ns")
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int BPF_KPROBE(handle__kprobe, struct hrtimer *timer, ktime_t tim, u64 delta_ns,
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const enum hrtimer_mode mode)
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{
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if (tim == MY_TV_NSEC)
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kprobe_called = true;
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return 0;
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}
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SEC("fentry/hrtimer_start_range_ns")
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int BPF_PROG(handle__fentry, struct hrtimer *timer, ktime_t tim, u64 delta_ns,
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const enum hrtimer_mode mode)
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{
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if (tim == MY_TV_NSEC)
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fentry_called = true;
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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