157 lines
3.1 KiB
C
157 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2017 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 <bpf/bpf_core_read.h>
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#include "bpf_misc.h"
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int kprobe_res = 0;
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int kprobe2_res = 0;
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int kretprobe_res = 0;
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int kretprobe2_res = 0;
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int uprobe_res = 0;
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int uretprobe_res = 0;
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int uprobe_byname_res = 0;
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int uretprobe_byname_res = 0;
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int uprobe_byname2_res = 0;
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int uretprobe_byname2_res = 0;
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int uprobe_byname3_sleepable_res = 0;
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int uprobe_byname3_res = 0;
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int uretprobe_byname3_sleepable_res = 0;
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int uretprobe_byname3_res = 0;
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void *user_ptr = 0;
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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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kprobe_res = 1;
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return 0;
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}
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SEC("ksyscall/nanosleep")
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int BPF_KSYSCALL(handle_kprobe_auto, struct __kernel_timespec *req, struct __kernel_timespec *rem)
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{
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kprobe2_res = 11;
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return 0;
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}
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/**
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* This program will be manually made sleepable on the userspace side
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* and should thus be unattachable.
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*/
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SEC("kprobe/" SYS_PREFIX "sys_nanosleep")
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int handle_kprobe_sleepable(struct pt_regs *ctx)
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{
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kprobe_res = 2;
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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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kretprobe_res = 2;
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return 0;
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}
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SEC("kretsyscall/nanosleep")
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int BPF_KRETPROBE(handle_kretprobe_auto, int ret)
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{
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kretprobe2_res = 22;
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return ret;
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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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uprobe_res = 3;
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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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uretprobe_res = 4;
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return 0;
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}
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SEC("uprobe")
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int handle_uprobe_byname(struct pt_regs *ctx)
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{
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uprobe_byname_res = 5;
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return 0;
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}
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/* use auto-attach format for section definition. */
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SEC("uretprobe//proc/self/exe:trigger_func2")
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int handle_uretprobe_byname(struct pt_regs *ctx)
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{
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uretprobe_byname_res = 6;
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return 0;
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}
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SEC("uprobe")
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int BPF_UPROBE(handle_uprobe_byname2, const char *pathname, const char *mode)
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{
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char mode_buf[2] = {};
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/* verify fopen mode */
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bpf_probe_read_user(mode_buf, sizeof(mode_buf), mode);
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if (mode_buf[0] == 'r' && mode_buf[1] == 0)
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uprobe_byname2_res = 7;
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return 0;
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}
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SEC("uretprobe")
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int BPF_URETPROBE(handle_uretprobe_byname2, void *ret)
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{
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uretprobe_byname2_res = 8;
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return 0;
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}
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static __always_inline bool verify_sleepable_user_copy(void)
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{
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char data[9];
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bpf_copy_from_user(data, sizeof(data), user_ptr);
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return bpf_strncmp(data, sizeof(data), "test_data") == 0;
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}
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SEC("uprobe.s//proc/self/exe:trigger_func3")
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int handle_uprobe_byname3_sleepable(struct pt_regs *ctx)
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{
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if (verify_sleepable_user_copy())
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uprobe_byname3_sleepable_res = 9;
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return 0;
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}
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/**
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* same target as the uprobe.s above to force sleepable and non-sleepable
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* programs in the same bpf_prog_array
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*/
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SEC("uprobe//proc/self/exe:trigger_func3")
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int handle_uprobe_byname3(struct pt_regs *ctx)
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{
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uprobe_byname3_res = 10;
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return 0;
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}
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SEC("uretprobe.s//proc/self/exe:trigger_func3")
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int handle_uretprobe_byname3_sleepable(struct pt_regs *ctx)
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{
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if (verify_sleepable_user_copy())
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uretprobe_byname3_sleepable_res = 11;
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return 0;
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}
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SEC("uretprobe//proc/self/exe:trigger_func3")
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int handle_uretprobe_byname3(struct pt_regs *ctx)
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{
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uretprobe_byname3_res = 12;
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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