122 lines
2.2 KiB
C
122 lines
2.2 KiB
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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#include <errno.h>
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int my_tid;
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__u64 kprobe_res;
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__u64 kprobe_multi_res;
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__u64 kretprobe_res;
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__u64 uprobe_res;
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__u64 uretprobe_res;
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__u64 tp_res;
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__u64 pe_res;
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__u64 fentry_res;
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__u64 fexit_res;
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__u64 fmod_ret_res;
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__u64 lsm_res;
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static void update(void *ctx, __u64 *res)
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{
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if (my_tid != (u32)bpf_get_current_pid_tgid())
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return;
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*res |= bpf_get_attach_cookie(ctx);
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}
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SEC("kprobe")
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int handle_kprobe(struct pt_regs *ctx)
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{
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update(ctx, &kprobe_res);
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return 0;
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}
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SEC("kretprobe")
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int handle_kretprobe(struct pt_regs *ctx)
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{
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update(ctx, &kretprobe_res);
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return 0;
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}
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SEC("uprobe")
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int handle_uprobe(struct pt_regs *ctx)
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{
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update(ctx, &uprobe_res);
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return 0;
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}
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SEC("uretprobe")
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int handle_uretprobe(struct pt_regs *ctx)
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{
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update(ctx, &uretprobe_res);
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return 0;
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}
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/* bpf_prog_array, used by kernel internally to keep track of attached BPF
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* programs to a given BPF hook (e.g., for tracepoints) doesn't allow the same
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* BPF program to be attached multiple times. So have three identical copies
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* ready to attach to the same tracepoint.
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*/
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SEC("tp/syscalls/sys_enter_nanosleep")
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int handle_tp1(struct pt_regs *ctx)
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{
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update(ctx, &tp_res);
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return 0;
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}
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SEC("tp/syscalls/sys_enter_nanosleep")
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int handle_tp2(struct pt_regs *ctx)
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{
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update(ctx, &tp_res);
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return 0;
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}
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SEC("tp/syscalls/sys_enter_nanosleep")
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int handle_tp3(void *ctx)
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{
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update(ctx, &tp_res);
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return 1;
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}
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SEC("perf_event")
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int handle_pe(struct pt_regs *ctx)
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{
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update(ctx, &pe_res);
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return 0;
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}
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SEC("fentry/bpf_fentry_test1")
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int BPF_PROG(fentry_test1, int a)
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{
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update(ctx, &fentry_res);
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return 0;
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}
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SEC("fexit/bpf_fentry_test1")
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int BPF_PROG(fexit_test1, int a, int ret)
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{
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update(ctx, &fexit_res);
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return 0;
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}
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SEC("fmod_ret/bpf_modify_return_test")
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int BPF_PROG(fmod_ret_test, int _a, int *_b, int _ret)
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{
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update(ctx, &fmod_ret_res);
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return 1234;
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}
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SEC("lsm/file_mprotect")
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int BPF_PROG(test_int_hook, struct vm_area_struct *vma,
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unsigned long reqprot, unsigned long prot, int ret)
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{
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if (my_tid != (u32)bpf_get_current_pid_tgid())
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return ret;
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update(ctx, &lsm_res);
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return -EPERM;
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}
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char _license[] SEC("license") = "GPL";
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