144 lines
3.3 KiB
C
144 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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/usdt.bpf.h>
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char _license[] SEC("license") = "GPL";
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__u64 uprobe_multi_func_1_addr = 0;
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__u64 uprobe_multi_func_2_addr = 0;
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__u64 uprobe_multi_func_3_addr = 0;
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__u64 uprobe_multi_func_1_result = 0;
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__u64 uprobe_multi_func_2_result = 0;
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__u64 uprobe_multi_func_3_result = 0;
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__u64 uretprobe_multi_func_1_result = 0;
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__u64 uretprobe_multi_func_2_result = 0;
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__u64 uretprobe_multi_func_3_result = 0;
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__u64 uprobe_multi_sleep_result = 0;
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int pid = 0;
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int child_pid = 0;
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int child_tid = 0;
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int child_pid_usdt = 0;
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int child_tid_usdt = 0;
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int expect_pid = 0;
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bool bad_pid_seen = false;
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bool bad_pid_seen_usdt = false;
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bool test_cookie = false;
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void *user_ptr = 0;
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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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static void uprobe_multi_check(void *ctx, bool is_return, bool is_sleep)
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{
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__u64 cur_pid_tgid = bpf_get_current_pid_tgid();
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__u32 cur_pid;
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cur_pid = cur_pid_tgid >> 32;
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if (pid && cur_pid != pid)
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return;
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if (expect_pid && cur_pid != expect_pid)
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bad_pid_seen = true;
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child_pid = cur_pid_tgid >> 32;
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child_tid = (__u32)cur_pid_tgid;
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__u64 cookie = test_cookie ? bpf_get_attach_cookie(ctx) : 0;
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__u64 addr = bpf_get_func_ip(ctx);
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#define SET(__var, __addr, __cookie) ({ \
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if (addr == __addr && \
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(!test_cookie || (cookie == __cookie))) \
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__var += 1; \
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})
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if (is_return) {
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SET(uretprobe_multi_func_1_result, uprobe_multi_func_1_addr, 2);
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SET(uretprobe_multi_func_2_result, uprobe_multi_func_2_addr, 3);
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SET(uretprobe_multi_func_3_result, uprobe_multi_func_3_addr, 1);
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} else {
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SET(uprobe_multi_func_1_result, uprobe_multi_func_1_addr, 3);
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SET(uprobe_multi_func_2_result, uprobe_multi_func_2_addr, 1);
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SET(uprobe_multi_func_3_result, uprobe_multi_func_3_addr, 2);
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}
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#undef SET
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if (is_sleep && verify_sleepable_user_copy())
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uprobe_multi_sleep_result += 1;
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}
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SEC("uprobe.multi//proc/self/exe:uprobe_multi_func_*")
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int uprobe(struct pt_regs *ctx)
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{
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uprobe_multi_check(ctx, false, false);
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return 0;
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}
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SEC("uretprobe.multi//proc/self/exe:uprobe_multi_func_*")
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int uretprobe(struct pt_regs *ctx)
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{
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uprobe_multi_check(ctx, true, false);
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return 0;
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}
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SEC("uprobe.multi.s//proc/self/exe:uprobe_multi_func_*")
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int uprobe_sleep(struct pt_regs *ctx)
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{
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uprobe_multi_check(ctx, false, true);
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return 0;
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}
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SEC("uretprobe.multi.s//proc/self/exe:uprobe_multi_func_*")
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int uretprobe_sleep(struct pt_regs *ctx)
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{
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uprobe_multi_check(ctx, true, true);
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return 0;
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}
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SEC("uprobe.multi//proc/self/exe:uprobe_multi_func_*")
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int uprobe_extra(struct pt_regs *ctx)
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{
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/* we need this one just to mix PID-filtered and global uprobes */
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return 0;
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}
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SEC("usdt")
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int usdt_pid(struct pt_regs *ctx)
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{
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__u64 cur_pid_tgid = bpf_get_current_pid_tgid();
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__u32 cur_pid;
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cur_pid = cur_pid_tgid >> 32;
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if (pid && cur_pid != pid)
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return 0;
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if (expect_pid && cur_pid != expect_pid)
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bad_pid_seen_usdt = true;
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child_pid_usdt = cur_pid_tgid >> 32;
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child_tid_usdt = (__u32)cur_pid_tgid;
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return 0;
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}
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SEC("usdt")
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int usdt_extra(struct pt_regs *ctx)
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{
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/* we need this one just to mix PID-filtered and global USDT probes */
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return 0;
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}
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