19685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey/* 29685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey * Copyright (C) 2012 The Android Open Source Project 39685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey * 49685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey * Licensed under the Apache License, Version 2.0 (the "License"); 59685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey * you may not use this file except in compliance with the License. 69685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey * You may obtain a copy of the License at 79685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey * 89685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey * http://www.apache.org/licenses/LICENSE-2.0 99685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey * 109685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey * Unless required by applicable law or agreed to in writing, software 119685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey * distributed under the License is distributed on an "AS IS" BASIS, 129685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey * See the License for the specific language governing permissions and 149685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey * limitations under the License. 159685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey */ 169685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey 17ddb173394430a7b55b0c24896a843556f5f8de7aJeff Sharkey#define LOG_TAG "cutils" 18ddb173394430a7b55b0c24896a843556f5f8de7aJeff Sharkey 1944d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey/* These defines are only needed because prebuilt headers are out of date */ 2044d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey#define __USE_XOPEN2K8 1 2144d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey#define _ATFILE_SOURCE 1 2244d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey#define _GNU_SOURCE 1 2344d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey 2423ed4c242a01052696dde84babd7631a7ec5a691Mark Salyzyn#include <dirent.h> 259685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey#include <errno.h> 2623ed4c242a01052696dde84babd7631a7ec5a691Mark Salyzyn#include <fcntl.h> 279685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey#include <limits.h> 28cfd5b080af8de527d768f0ff7902c26af8d49307Mark Salyzyn#include <stdio.h> 2969ce489fc3946b7b89ca837a01d3828f1af2e0a0Nick Kralevich#include <stdlib.h> 3023ed4c242a01052696dde84babd7631a7ec5a691Mark Salyzyn#include <string.h> 3123ed4c242a01052696dde84babd7631a7ec5a691Mark Salyzyn#include <sys/stat.h> 3223ed4c242a01052696dde84babd7631a7ec5a691Mark Salyzyn#include <sys/types.h> 3323ed4c242a01052696dde84babd7631a7ec5a691Mark Salyzyn#include <unistd.h> 3423ed4c242a01052696dde84babd7631a7ec5a691Mark Salyzyn 3523ed4c242a01052696dde84babd7631a7ec5a691Mark Salyzyn#include <cutils/fs.h> 3630f991f251940be3ed11566fb71139852286f68aMark Salyzyn#include <log/log.h> 379685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey 389685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey#define ALL_PERMS (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO) 399685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey#define BUF_SIZE 64 409685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey 419812105b20a19354d9bd6f912da707203d62b397Calin Juravlestatic int fs_prepare_path_impl(const char* path, mode_t mode, uid_t uid, gid_t gid, 429812105b20a19354d9bd6f912da707203d62b397Calin Juravle int allow_fixup, int prepare_as_dir) { 439685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey // Check if path needs to be created 449685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey struct stat sb; 459812105b20a19354d9bd6f912da707203d62b397Calin Juravle int create_result = -1; 46ddb173394430a7b55b0c24896a843556f5f8de7aJeff Sharkey if (TEMP_FAILURE_RETRY(lstat(path, &sb)) == -1) { 479685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey if (errno == ENOENT) { 489685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey goto create; 499685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey } else { 50ddb173394430a7b55b0c24896a843556f5f8de7aJeff Sharkey ALOGE("Failed to lstat(%s): %s", path, strerror(errno)); 519685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey return -1; 529685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey } 539685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey } 549685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey 559685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey // Exists, verify status 569812105b20a19354d9bd6f912da707203d62b397Calin Juravle int type_ok = prepare_as_dir ? S_ISDIR(sb.st_mode) : S_ISREG(sb.st_mode); 579812105b20a19354d9bd6f912da707203d62b397Calin Juravle if (!type_ok) { 589812105b20a19354d9bd6f912da707203d62b397Calin Juravle ALOGE("Not a %s: %s", (prepare_as_dir ? "directory" : "regular file"), path); 599685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey return -1; 609685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey } 619812105b20a19354d9bd6f912da707203d62b397Calin Juravle 62814640315a91ec9de43a34ef6b360540edbfb092Jeff Sharkey int owner_match = ((sb.st_uid == uid) && (sb.st_gid == gid)); 63814640315a91ec9de43a34ef6b360540edbfb092Jeff Sharkey int mode_match = ((sb.st_mode & ALL_PERMS) == mode); 64814640315a91ec9de43a34ef6b360540edbfb092Jeff Sharkey if (owner_match && mode_match) { 659685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey return 0; 66cf94fe152e220110d606dcbe2f8a2bd9da0546bcJeff Sharkey } else if (allow_fixup) { 679685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey goto fixup; 68cf94fe152e220110d606dcbe2f8a2bd9da0546bcJeff Sharkey } else { 69814640315a91ec9de43a34ef6b360540edbfb092Jeff Sharkey if (!owner_match) { 70814640315a91ec9de43a34ef6b360540edbfb092Jeff Sharkey ALOGE("Expected path %s with owner %d:%d but found %d:%d", 71814640315a91ec9de43a34ef6b360540edbfb092Jeff Sharkey path, uid, gid, sb.st_uid, sb.st_gid); 72814640315a91ec9de43a34ef6b360540edbfb092Jeff Sharkey return -1; 73814640315a91ec9de43a34ef6b360540edbfb092Jeff Sharkey } else { 74814640315a91ec9de43a34ef6b360540edbfb092Jeff Sharkey ALOGW("Expected path %s with mode %o but found %o", 75814640315a91ec9de43a34ef6b360540edbfb092Jeff Sharkey path, mode, (sb.st_mode & ALL_PERMS)); 76814640315a91ec9de43a34ef6b360540edbfb092Jeff Sharkey return 0; 77814640315a91ec9de43a34ef6b360540edbfb092Jeff Sharkey } 789685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey } 799685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey 809685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkeycreate: 819812105b20a19354d9bd6f912da707203d62b397Calin Juravle create_result = prepare_as_dir 829812105b20a19354d9bd6f912da707203d62b397Calin Juravle ? TEMP_FAILURE_RETRY(mkdir(path, mode)) 8309175a0264d86b6e0cae9324cd95aef0711ae560George Burgess IV : TEMP_FAILURE_RETRY(open(path, O_CREAT | O_CLOEXEC | O_NOFOLLOW | O_RDONLY, 0644)); 849812105b20a19354d9bd6f912da707203d62b397Calin Juravle if (create_result == -1) { 85489609bb44fe8834c76c772f2cff8f03dbb84e08Jeff Sharkey if (errno != EEXIST) { 869812105b20a19354d9bd6f912da707203d62b397Calin Juravle ALOGE("Failed to %s(%s): %s", 879812105b20a19354d9bd6f912da707203d62b397Calin Juravle (prepare_as_dir ? "mkdir" : "open"), path, strerror(errno)); 88489609bb44fe8834c76c772f2cff8f03dbb84e08Jeff Sharkey return -1; 89489609bb44fe8834c76c772f2cff8f03dbb84e08Jeff Sharkey } 909812105b20a19354d9bd6f912da707203d62b397Calin Juravle } else if (!prepare_as_dir) { 919812105b20a19354d9bd6f912da707203d62b397Calin Juravle // For regular files we need to make sure we close the descriptor 929812105b20a19354d9bd6f912da707203d62b397Calin Juravle if (close(create_result) == -1) { 939812105b20a19354d9bd6f912da707203d62b397Calin Juravle ALOGW("Failed to close file after create %s: %s", path, strerror(errno)); 949812105b20a19354d9bd6f912da707203d62b397Calin Juravle } 959685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey } 969685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkeyfixup: 97ddb173394430a7b55b0c24896a843556f5f8de7aJeff Sharkey if (TEMP_FAILURE_RETRY(chmod(path, mode)) == -1) { 98ddb173394430a7b55b0c24896a843556f5f8de7aJeff Sharkey ALOGE("Failed to chmod(%s, %d): %s", path, mode, strerror(errno)); 999685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey return -1; 1009685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey } 101ddb173394430a7b55b0c24896a843556f5f8de7aJeff Sharkey if (TEMP_FAILURE_RETRY(chown(path, uid, gid)) == -1) { 1029685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey ALOGE("Failed to chown(%s, %d, %d): %s", path, uid, gid, strerror(errno)); 1039685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey return -1; 1049685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey } 1059685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey 1069685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey return 0; 1079685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey} 1089685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey 109cf94fe152e220110d606dcbe2f8a2bd9da0546bcJeff Sharkeyint fs_prepare_dir(const char* path, mode_t mode, uid_t uid, gid_t gid) { 1109812105b20a19354d9bd6f912da707203d62b397Calin Juravle return fs_prepare_path_impl(path, mode, uid, gid, /*allow_fixup*/ 1, /*prepare_as_dir*/ 1); 111cf94fe152e220110d606dcbe2f8a2bd9da0546bcJeff Sharkey} 112cf94fe152e220110d606dcbe2f8a2bd9da0546bcJeff Sharkey 113cf94fe152e220110d606dcbe2f8a2bd9da0546bcJeff Sharkeyint fs_prepare_dir_strict(const char* path, mode_t mode, uid_t uid, gid_t gid) { 1149812105b20a19354d9bd6f912da707203d62b397Calin Juravle return fs_prepare_path_impl(path, mode, uid, gid, /*allow_fixup*/ 0, /*prepare_as_dir*/ 1); 1159812105b20a19354d9bd6f912da707203d62b397Calin Juravle} 1169812105b20a19354d9bd6f912da707203d62b397Calin Juravle 1179812105b20a19354d9bd6f912da707203d62b397Calin Juravleint fs_prepare_file_strict(const char* path, mode_t mode, uid_t uid, gid_t gid) { 1189812105b20a19354d9bd6f912da707203d62b397Calin Juravle return fs_prepare_path_impl(path, mode, uid, gid, /*allow_fixup*/ 0, /*prepare_as_dir*/ 0); 119cf94fe152e220110d606dcbe2f8a2bd9da0546bcJeff Sharkey} 120cf94fe152e220110d606dcbe2f8a2bd9da0546bcJeff Sharkey 1219685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkeyint fs_read_atomic_int(const char* path, int* out_value) { 1226de702679089fab13ec2d4d435054f68688df545Jeff Sharkey int fd = TEMP_FAILURE_RETRY(open(path, O_RDONLY)); 1239685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey if (fd == -1) { 1249685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey ALOGE("Failed to read %s: %s", path, strerror(errno)); 1259685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey return -1; 1269685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey } 1279685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey 1289685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey char buf[BUF_SIZE]; 1296de702679089fab13ec2d4d435054f68688df545Jeff Sharkey if (TEMP_FAILURE_RETRY(read(fd, buf, BUF_SIZE)) == -1) { 1309685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey ALOGE("Failed to read %s: %s", path, strerror(errno)); 1319685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey goto fail; 1329685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey } 1339685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey if (sscanf(buf, "%d", out_value) != 1) { 1349685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey ALOGE("Failed to parse %s: %s", path, strerror(errno)); 1359685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey goto fail; 1369685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey } 1379685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey close(fd); 1389685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey return 0; 1399685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey 1409685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkeyfail: 1419685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey close(fd); 1429685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey *out_value = -1; 1439685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey return -1; 1449685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey} 1459685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey 1469685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkeyint fs_write_atomic_int(const char* path, int value) { 1479685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey char temp[PATH_MAX]; 1489685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey if (snprintf(temp, PATH_MAX, "%s.XXXXXX", path) >= PATH_MAX) { 1499685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey ALOGE("Path too long"); 1509685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey return -1; 1519685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey } 1529685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey 1536de702679089fab13ec2d4d435054f68688df545Jeff Sharkey int fd = TEMP_FAILURE_RETRY(mkstemp(temp)); 1549685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey if (fd == -1) { 1559685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey ALOGE("Failed to open %s: %s", temp, strerror(errno)); 1569685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey return -1; 1579685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey } 1589685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey 1599685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey char buf[BUF_SIZE]; 1609685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey int len = snprintf(buf, BUF_SIZE, "%d", value) + 1; 1619685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey if (len > BUF_SIZE) { 1629685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey ALOGE("Value %d too large: %s", value, strerror(errno)); 1639685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey goto fail; 1649685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey } 1656de702679089fab13ec2d4d435054f68688df545Jeff Sharkey if (TEMP_FAILURE_RETRY(write(fd, buf, len)) < len) { 1669685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey ALOGE("Failed to write %s: %s", temp, strerror(errno)); 1679685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey goto fail; 1689685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey } 1699685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey if (close(fd) == -1) { 1709685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey ALOGE("Failed to close %s: %s", temp, strerror(errno)); 1719685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey goto fail_closed; 1729685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey } 1739685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey 1749685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey if (rename(temp, path) == -1) { 1759685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey ALOGE("Failed to rename %s to %s: %s", temp, path, strerror(errno)); 1769685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey goto fail_closed; 1779685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey } 1789685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey 1799685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey return 0; 1809685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey 1819685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkeyfail: 1829685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey close(fd); 1839685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkeyfail_closed: 1849685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey unlink(temp); 1859685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey return -1; 1869685194fc94510a33201aee9b80c23f206ccfe67Jeff Sharkey} 18744d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey 1880ee7d8c68b57c02d02f707d6f71c731234d56eecJeff Sharkey#ifndef __APPLE__ 1890ee7d8c68b57c02d02f707d6f71c731234d56eecJeff Sharkey 19044d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkeyint fs_mkdirs(const char* path, mode_t mode) { 19144d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey int res = 0; 19244d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey int fd = 0; 19344d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey struct stat sb; 19444d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey char* buf = strdup(path); 19544d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey 19644d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey if (*buf != '/') { 19744d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey ALOGE("Relative paths are not allowed: %s", buf); 19844d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey res = -EINVAL; 19944d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey goto done; 20044d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey } 20144d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey 20244d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey if ((fd = open("/", 0)) == -1) { 20344d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey ALOGE("Failed to open(/): %s", strerror(errno)); 20444d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey res = -errno; 20544d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey goto done; 20644d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey } 20744d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey 20844d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey char* segment = buf + 1; 20944d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey char* p = segment; 21044d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey while (*p != '\0') { 21144d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey if (*p == '/') { 21244d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey *p = '\0'; 21344d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey 21444d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey if (!strcmp(segment, "..") || !strcmp(segment, ".") || !strcmp(segment, "")) { 21544d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey ALOGE("Invalid path: %s", buf); 21644d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey res = -EINVAL; 21744d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey goto done_close; 21844d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey } 21944d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey 22044d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey if (fstatat(fd, segment, &sb, AT_SYMLINK_NOFOLLOW) != 0) { 22144d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey if (errno == ENOENT) { 22244d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey /* Nothing there yet; let's create it! */ 22344d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey if (mkdirat(fd, segment, mode) != 0) { 22444d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey if (errno == EEXIST) { 22544d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey /* We raced with someone; ignore */ 22644d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey } else { 22744d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey ALOGE("Failed to mkdirat(%s): %s", buf, strerror(errno)); 22844d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey res = -errno; 22944d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey goto done_close; 23044d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey } 23144d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey } 23244d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey } else { 23344d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey ALOGE("Failed to fstatat(%s): %s", buf, strerror(errno)); 23444d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey res = -errno; 23544d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey goto done_close; 23644d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey } 23744d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey } else { 23844d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey if (S_ISLNK(sb.st_mode)) { 23944d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey ALOGE("Symbolic links are not allowed: %s", buf); 24044d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey res = -ELOOP; 24144d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey goto done_close; 24244d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey } 24344d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey if (!S_ISDIR(sb.st_mode)) { 24444d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey ALOGE("Existing segment not a directory: %s", buf); 24544d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey res = -ENOTDIR; 24644d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey goto done_close; 24744d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey } 24844d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey } 24944d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey 25044d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey /* Yay, segment is ready for us to step into */ 25144d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey int next_fd; 25230a86ebc7a0f5a2e0fc698f432ee626cd96525b8Nick Kralevich if ((next_fd = openat(fd, segment, O_NOFOLLOW | O_CLOEXEC)) == -1) { 25344d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey ALOGE("Failed to openat(%s): %s", buf, strerror(errno)); 25444d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey res = -errno; 25544d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey goto done_close; 25644d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey } 25744d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey 25844d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey close(fd); 25944d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey fd = next_fd; 26044d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey 26144d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey *p = '/'; 26244d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey segment = p + 1; 26344d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey } 26444d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey p++; 26544d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey } 26644d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey 26744d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkeydone_close: 26844d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey close(fd); 26944d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkeydone: 27044d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey free(buf); 27144d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey return res; 27244d6342caa0db1f613809e9ba1ea8d9af0183b74Jeff Sharkey} 2730ee7d8c68b57c02d02f707d6f71c731234d56eecJeff Sharkey 2740ee7d8c68b57c02d02f707d6f71c731234d56eecJeff Sharkey#endif 275