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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 | // SPDX-License-Identifier: GPL-2.0 #define _GNU_SOURCE #include <test_progs.h> #include <sys/stat.h> #include <linux/sched.h> #include <sys/syscall.h> #define MAX_PATH_LEN 128 #define MAX_FILES 7 #include "test_d_path.skel.h" #include "test_d_path_check_rdonly_mem.skel.h" #include "test_d_path_check_types.skel.h" static int duration; static struct { __u32 cnt; char paths[MAX_FILES][MAX_PATH_LEN]; } src; static int set_pathname(int fd, pid_t pid) { char buf[MAX_PATH_LEN]; snprintf(buf, MAX_PATH_LEN, "/proc/%d/fd/%d", pid, fd); return readlink(buf, src.paths[src.cnt++], MAX_PATH_LEN); } static int trigger_fstat_events(pid_t pid) { int sockfd = -1, procfd = -1, devfd = -1; int localfd = -1, indicatorfd = -1; int pipefd[2] = { -1, -1 }; struct stat fileStat; int ret = -1; /* unmountable pseudo-filesystems */ if (CHECK(pipe(pipefd) < 0, "trigger", "pipe failed\n")) return ret; /* unmountable pseudo-filesystems */ sockfd = socket(AF_INET, SOCK_STREAM, 0); if (CHECK(sockfd < 0, "trigger", "socket failed\n")) goto out_close; /* mountable pseudo-filesystems */ procfd = open("/proc/self/comm", O_RDONLY); if (CHECK(procfd < 0, "trigger", "open /proc/self/comm failed\n")) goto out_close; devfd = open("/dev/urandom", O_RDONLY); if (CHECK(devfd < 0, "trigger", "open /dev/urandom failed\n")) goto out_close; localfd = open("/tmp/d_path_loadgen.txt", O_CREAT | O_RDONLY, 0644); if (CHECK(localfd < 0, "trigger", "open /tmp/d_path_loadgen.txt failed\n")) goto out_close; /* bpf_d_path will return path with (deleted) */ remove("/tmp/d_path_loadgen.txt"); indicatorfd = open("/tmp/", O_PATH); if (CHECK(indicatorfd < 0, "trigger", "open /tmp/ failed\n")) goto out_close; ret = set_pathname(pipefd[0], pid); if (CHECK(ret < 0, "trigger", "set_pathname failed for pipe[0]\n")) goto out_close; ret = set_pathname(pipefd[1], pid); if (CHECK(ret < 0, "trigger", "set_pathname failed for pipe[1]\n")) goto out_close; ret = set_pathname(sockfd, pid); if (CHECK(ret < 0, "trigger", "set_pathname failed for socket\n")) goto out_close; ret = set_pathname(procfd, pid); if (CHECK(ret < 0, "trigger", "set_pathname failed for proc\n")) goto out_close; ret = set_pathname(devfd, pid); if (CHECK(ret < 0, "trigger", "set_pathname failed for dev\n")) goto out_close; ret = set_pathname(localfd, pid); if (CHECK(ret < 0, "trigger", "set_pathname failed for file\n")) goto out_close; ret = set_pathname(indicatorfd, pid); if (CHECK(ret < 0, "trigger", "set_pathname failed for dir\n")) goto out_close; /* triggers vfs_getattr */ fstat(pipefd[0], &fileStat); fstat(pipefd[1], &fileStat); fstat(sockfd, &fileStat); fstat(procfd, &fileStat); fstat(devfd, &fileStat); fstat(localfd, &fileStat); fstat(indicatorfd, &fileStat); out_close: /* triggers filp_close */ close(pipefd[0]); close(pipefd[1]); close(sockfd); close(procfd); close(devfd); close(localfd); close(indicatorfd); return ret; } static void test_d_path_basic(void) { struct test_d_path__bss *bss; struct test_d_path *skel; int err; skel = test_d_path__open_and_load(); if (CHECK(!skel, "setup", "d_path skeleton failed\n")) goto cleanup; err = test_d_path__attach(skel); if (CHECK(err, "setup", "attach failed: %d\n", err)) goto cleanup; bss = skel->bss; bss->my_pid = getpid(); err = trigger_fstat_events(bss->my_pid); if (err < 0) goto cleanup; if (CHECK(!bss->called_stat, "stat", "trampoline for security_inode_getattr was not called\n")) goto cleanup; if (CHECK(!bss->called_close, "close", "trampoline for filp_close was not called\n")) goto cleanup; for (int i = 0; i < MAX_FILES; i++) { CHECK(strncmp(src.paths[i], bss->paths_stat[i], MAX_PATH_LEN), "check", "failed to get stat path[%d]: %s vs %s\n", i, src.paths[i], bss->paths_stat[i]); CHECK(strncmp(src.paths[i], bss->paths_close[i], MAX_PATH_LEN), "check", "failed to get close path[%d]: %s vs %s\n", i, src.paths[i], bss->paths_close[i]); /* The d_path helper returns size plus NUL char, hence + 1 */ CHECK(bss->rets_stat[i] != strlen(bss->paths_stat[i]) + 1, "check", "failed to match stat return [%d]: %d vs %zd [%s]\n", i, bss->rets_stat[i], strlen(bss->paths_stat[i]) + 1, bss->paths_stat[i]); CHECK(bss->rets_close[i] != strlen(bss->paths_stat[i]) + 1, "check", "failed to match stat return [%d]: %d vs %zd [%s]\n", i, bss->rets_close[i], strlen(bss->paths_close[i]) + 1, bss->paths_stat[i]); } cleanup: test_d_path__destroy(skel); } static void test_d_path_check_rdonly_mem(void) { struct test_d_path_check_rdonly_mem *skel; skel = test_d_path_check_rdonly_mem__open_and_load(); ASSERT_ERR_PTR(skel, "unexpected_load_overwriting_rdonly_mem"); test_d_path_check_rdonly_mem__destroy(skel); } static void test_d_path_check_types(void) { struct test_d_path_check_types *skel; skel = test_d_path_check_types__open_and_load(); ASSERT_ERR_PTR(skel, "unexpected_load_passing_wrong_type"); test_d_path_check_types__destroy(skel); } void test_d_path(void) { if (test__start_subtest("basic")) test_d_path_basic(); if (test__start_subtest("check_rdonly_mem")) test_d_path_check_rdonly_mem(); if (test__start_subtest("check_alloc_mem")) test_d_path_check_types(); } |