mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Ihor SolodraiandAlexei Starovoitov
25bb05dd06
The vmlinux selftest triggers nanosleep and checks that both kprobe and fentry programs observe the hrtimer enqueue path. After the hrtimer_start_expires_user() conversion [1], nanosleep reaches hrtimer_start_range_ns_user() instead of hrtimer_start_range_ns(). Hard-coding either symbol makes the test fail either on bpf tree or on linux-next [2]. Update the test to resolve the target symbol at runtime via libbpf_find_vmlinux_btf_id(). This is a nice example of how to modify a BPF program to work on both older and newer kernel revision. [1] https://lore.kernel.org/all/20260408114952.062400833@kernel.org/ [2] https://github.com/kernel-patches/bpf/actions/runs/25485909958/job/74782902203 Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev> Acked-by: Jiri Olsa <jolsa@kernel.org> Link: https://lore.kernel.org/r/20260509005730.250956-1-ihor.solodrai@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>
91 lines
1.9 KiB
C
91 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 syscall_trace_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->nr != __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_SYSCALL(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_SYSCALL(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")
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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")
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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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