1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2020 Facebook */ 3 #include <test_progs.h> 4 #include "test_subprogs.skel.h" 5 #include "test_subprogs_unused.skel.h" 6 7 struct toggler_ctx { 8 int fd; 9 bool stop; 10 }; 11 12 static void *toggle_jit_harden(void *arg) 13 { 14 struct toggler_ctx *ctx = arg; 15 char two = '2'; 16 char zero = '0'; 17 18 while (!ctx->stop) { 19 lseek(ctx->fd, SEEK_SET, 0); 20 write(ctx->fd, &two, sizeof(two)); 21 lseek(ctx->fd, SEEK_SET, 0); 22 write(ctx->fd, &zero, sizeof(zero)); 23 } 24 25 return NULL; 26 } 27 28 static void test_subprogs_with_jit_harden_toggling(void) 29 { 30 struct toggler_ctx ctx; 31 pthread_t toggler; 32 int err; 33 unsigned int i, loop = 10; 34 35 ctx.fd = open("/proc/sys/net/core/bpf_jit_harden", O_RDWR); 36 if (!ASSERT_GE(ctx.fd, 0, "open bpf_jit_harden")) 37 return; 38 39 ctx.stop = false; 40 err = pthread_create(&toggler, NULL, toggle_jit_harden, &ctx); 41 if (!ASSERT_OK(err, "new toggler")) 42 goto out; 43 44 /* Make toggler thread to run */ 45 usleep(1); 46 47 for (i = 0; i < loop; i++) { 48 struct test_subprogs *skel = test_subprogs__open_and_load(); 49 50 if (!ASSERT_OK_PTR(skel, "skel open")) 51 break; 52 test_subprogs__destroy(skel); 53 } 54 55 ctx.stop = true; 56 pthread_join(toggler, NULL); 57 out: 58 close(ctx.fd); 59 } 60 61 static void test_subprogs_alone(void) 62 { 63 struct test_subprogs *skel; 64 struct test_subprogs_unused *skel2; 65 int err; 66 67 skel = test_subprogs__open_and_load(); 68 if (!ASSERT_OK_PTR(skel, "skel_open")) 69 return; 70 71 err = test_subprogs__attach(skel); 72 if (!ASSERT_OK(err, "skel attach")) 73 goto cleanup; 74 75 usleep(1); 76 77 ASSERT_EQ(skel->bss->res1, 12, "res1"); 78 ASSERT_EQ(skel->bss->res2, 17, "res2"); 79 ASSERT_EQ(skel->bss->res3, 19, "res3"); 80 ASSERT_EQ(skel->bss->res4, 36, "res4"); 81 82 skel2 = test_subprogs_unused__open_and_load(); 83 ASSERT_OK_PTR(skel2, "unused_progs_skel"); 84 test_subprogs_unused__destroy(skel2); 85 86 cleanup: 87 test_subprogs__destroy(skel); 88 } 89 90 void test_subprogs(void) 91 { 92 if (test__start_subtest("subprogs_alone")) 93 test_subprogs_alone(); 94 if (test__start_subtest("subprogs_and_jit_harden")) 95 test_subprogs_with_jit_harden_toggling(); 96 } 97