1 // SPDX-License-Identifier: GPL-2.0 2 #include <vmlinux.h> 3 #include <bpf/bpf_helpers.h> 4 #include <bpf/bpf_tracing.h> 5 #include <stdbool.h> 6 #include "bpf_misc.h" 7 8 char _license[] SEC("license") = "GPL"; 9 10 __u64 uprobe_multi_func_1_addr = 0; 11 __u64 uprobe_multi_func_2_addr = 0; 12 __u64 uprobe_multi_func_3_addr = 0; 13 14 __u64 uprobe_session_result[3] = {}; 15 __u64 uprobe_multi_sleep_result = 0; 16 17 void *user_ptr = 0; 18 int pid = 0; 19 20 static int uprobe_multi_check(void *ctx, bool is_return) 21 { 22 const __u64 funcs[] = { 23 uprobe_multi_func_1_addr, 24 uprobe_multi_func_2_addr, 25 uprobe_multi_func_3_addr, 26 }; 27 unsigned int i; 28 __u64 addr; 29 30 if (bpf_get_current_pid_tgid() >> 32 != pid) 31 return 1; 32 33 addr = bpf_get_func_ip(ctx); 34 35 for (i = 0; i < ARRAY_SIZE(funcs); i++) { 36 if (funcs[i] == addr) { 37 uprobe_session_result[i]++; 38 break; 39 } 40 } 41 42 /* only uprobe_multi_func_2 executes return probe */ 43 if ((addr == uprobe_multi_func_1_addr) || 44 (addr == uprobe_multi_func_3_addr)) 45 return 1; 46 47 return 0; 48 } 49 50 SEC("uprobe.session//proc/self/exe:uprobe_multi_func_*") 51 int uprobe(struct pt_regs *ctx) 52 { 53 return uprobe_multi_check(ctx, bpf_session_is_return(ctx)); 54 } 55 56 static __always_inline bool verify_sleepable_user_copy(void) 57 { 58 char data[9]; 59 60 bpf_copy_from_user(data, sizeof(data), user_ptr); 61 return bpf_strncmp(data, sizeof(data), "test_data") == 0; 62 } 63 64 SEC("uprobe.session.s//proc/self/exe:uprobe_multi_func_*") 65 int uprobe_sleepable(struct pt_regs *ctx) 66 { 67 if (verify_sleepable_user_copy()) 68 uprobe_multi_sleep_result++; 69 return uprobe_multi_check(ctx, bpf_session_is_return(ctx)); 70 } 71