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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 | // SPDX-License-Identifier: GPL-2.0-only /* * Helper functions for handling target threads/cpus * * Copyright (C) 2012, LG Electronics, Namhyung Kim <namhyung.kim@lge.com> */ #include "target.h" #include <pwd.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <linux/kernel.h> #include <linux/string.h> enum target_errno target__validate(struct target *target) { enum target_errno ret = TARGET_ERRNO__SUCCESS; if (target->pid) target->tid = target->pid; /* CPU and PID are mutually exclusive */ if (target->tid && target->cpu_list) { target->cpu_list = NULL; if (ret == TARGET_ERRNO__SUCCESS) ret = TARGET_ERRNO__PID_OVERRIDE_CPU; } /* UID and PID are mutually exclusive */ if (target->tid && target->uid_str) { target->uid_str = NULL; if (ret == TARGET_ERRNO__SUCCESS) ret = TARGET_ERRNO__PID_OVERRIDE_UID; } /* UID and CPU are mutually exclusive */ if (target->uid_str && target->cpu_list) { target->cpu_list = NULL; if (ret == TARGET_ERRNO__SUCCESS) ret = TARGET_ERRNO__UID_OVERRIDE_CPU; } /* PID and SYSTEM are mutually exclusive */ if (target->tid && target->system_wide) { target->system_wide = false; if (ret == TARGET_ERRNO__SUCCESS) ret = TARGET_ERRNO__PID_OVERRIDE_SYSTEM; } /* UID and SYSTEM are mutually exclusive */ if (target->uid_str && target->system_wide) { target->system_wide = false; if (ret == TARGET_ERRNO__SUCCESS) ret = TARGET_ERRNO__UID_OVERRIDE_SYSTEM; } /* BPF and CPU are mutually exclusive */ if (target->bpf_str && target->cpu_list) { target->cpu_list = NULL; if (ret == TARGET_ERRNO__SUCCESS) ret = TARGET_ERRNO__BPF_OVERRIDE_CPU; } /* BPF and PID/TID are mutually exclusive */ if (target->bpf_str && target->tid) { target->tid = NULL; if (ret == TARGET_ERRNO__SUCCESS) ret = TARGET_ERRNO__BPF_OVERRIDE_PID; } /* BPF and UID are mutually exclusive */ if (target->bpf_str && target->uid_str) { target->uid_str = NULL; if (ret == TARGET_ERRNO__SUCCESS) ret = TARGET_ERRNO__BPF_OVERRIDE_UID; } /* BPF and THREADS are mutually exclusive */ if (target->bpf_str && target->per_thread) { target->per_thread = false; if (ret == TARGET_ERRNO__SUCCESS) ret = TARGET_ERRNO__BPF_OVERRIDE_THREAD; } /* THREAD and SYSTEM/CPU are mutually exclusive */ if (target->per_thread && (target->system_wide || target->cpu_list)) { target->per_thread = false; if (ret == TARGET_ERRNO__SUCCESS) ret = TARGET_ERRNO__SYSTEM_OVERRIDE_THREAD; } return ret; } enum target_errno target__parse_uid(struct target *target) { struct passwd pwd, *result; char buf[1024]; const char *str = target->uid_str; target->uid = UINT_MAX; if (str == NULL) return TARGET_ERRNO__SUCCESS; /* Try user name first */ getpwnam_r(str, &pwd, buf, sizeof(buf), &result); if (result == NULL) { /* * The user name not found. Maybe it's a UID number. */ char *endptr; int uid = strtol(str, &endptr, 10); if (*endptr != '\0') return TARGET_ERRNO__INVALID_UID; getpwuid_r(uid, &pwd, buf, sizeof(buf), &result); if (result == NULL) return TARGET_ERRNO__USER_NOT_FOUND; } target->uid = result->pw_uid; return TARGET_ERRNO__SUCCESS; } /* * This must have a same ordering as the enum target_errno. */ static const char *target__error_str[] = { "PID/TID switch overriding CPU", "PID/TID switch overriding UID", "UID switch overriding CPU", "PID/TID switch overriding SYSTEM", "UID switch overriding SYSTEM", "SYSTEM/CPU switch overriding PER-THREAD", "BPF switch overriding CPU", "BPF switch overriding PID/TID", "BPF switch overriding UID", "BPF switch overriding THREAD", "Invalid User: %s", "Problems obtaining information for user %s", }; int target__strerror(struct target *target, int errnum, char *buf, size_t buflen) { int idx; const char *msg; BUG_ON(buflen == 0); if (errnum >= 0) { str_error_r(errnum, buf, buflen); return 0; } if (errnum < __TARGET_ERRNO__START || errnum >= __TARGET_ERRNO__END) return -1; idx = errnum - __TARGET_ERRNO__START; msg = target__error_str[idx]; switch (errnum) { case TARGET_ERRNO__PID_OVERRIDE_CPU ... TARGET_ERRNO__BPF_OVERRIDE_THREAD: snprintf(buf, buflen, "%s", msg); break; case TARGET_ERRNO__INVALID_UID: case TARGET_ERRNO__USER_NOT_FOUND: snprintf(buf, buflen, msg, target->uid_str); break; default: /* cannot reach here */ break; } return 0; } |