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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 | // SPDX-License-Identifier: GPL-2.0 #define _GNU_SOURCE #include <errno.h> #include <fcntl.h> #include <inttypes.h> #include <limits.h> #include <linux/types.h> #include <sched.h> #include <signal.h> #include <stdbool.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <syscall.h> #include <sys/mount.h> #include <sys/prctl.h> #include <sys/wait.h> #include <unistd.h> #include "pidfd.h" #include "../kselftest.h" static int safe_int(const char *numstr, int *converted) { char *err = NULL; long sli; errno = 0; sli = strtol(numstr, &err, 0); if (errno == ERANGE && (sli == LONG_MAX || sli == LONG_MIN)) return -ERANGE; if (errno != 0 && sli == 0) return -EINVAL; if (err == numstr || *err != '\0') return -EINVAL; if (sli > INT_MAX || sli < INT_MIN) return -ERANGE; *converted = (int)sli; return 0; } static int char_left_gc(const char *buffer, size_t len) { size_t i; for (i = 0; i < len; i++) { if (buffer[i] == ' ' || buffer[i] == '\t') continue; return i; } return 0; } static int char_right_gc(const char *buffer, size_t len) { int i; for (i = len - 1; i >= 0; i--) { if (buffer[i] == ' ' || buffer[i] == '\t' || buffer[i] == '\n' || buffer[i] == '\0') continue; return i + 1; } return 0; } static char *trim_whitespace_in_place(char *buffer) { buffer += char_left_gc(buffer, strlen(buffer)); buffer[char_right_gc(buffer, strlen(buffer))] = '\0'; return buffer; } static pid_t get_pid_from_fdinfo_file(int pidfd, const char *key, size_t keylen) { int ret; char path[512]; FILE *f; size_t n = 0; pid_t result = -1; char *line = NULL; snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", pidfd); f = fopen(path, "re"); if (!f) return -1; while (getline(&line, &n, f) != -1) { char *numstr; if (strncmp(line, key, keylen)) continue; numstr = trim_whitespace_in_place(line + 4); ret = safe_int(numstr, &result); if (ret < 0) goto out; break; } out: free(line); fclose(f); return result; } int main(int argc, char **argv) { int pidfd = -1, ret = 1; pid_t pid; ksft_set_plan(3); pidfd = sys_pidfd_open(-1, 0); if (pidfd >= 0) { ksft_print_msg( "%s - succeeded to open pidfd for invalid pid -1\n", strerror(errno)); goto on_error; } ksft_test_result_pass("do not allow invalid pid test: passed\n"); pidfd = sys_pidfd_open(getpid(), 1); if (pidfd >= 0) { ksft_print_msg( "%s - succeeded to open pidfd with invalid flag value specified\n", strerror(errno)); goto on_error; } ksft_test_result_pass("do not allow invalid flag test: passed\n"); pidfd = sys_pidfd_open(getpid(), 0); if (pidfd < 0) { ksft_print_msg("%s - failed to open pidfd\n", strerror(errno)); goto on_error; } ksft_test_result_pass("open a new pidfd test: passed\n"); pid = get_pid_from_fdinfo_file(pidfd, "Pid:", sizeof("Pid:") - 1); ksft_print_msg("pidfd %d refers to process with pid %d\n", pidfd, pid); ret = 0; on_error: if (pidfd >= 0) close(pidfd); return !ret ? ksft_exit_pass() : ksft_exit_fail(); } |