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https://github.com/google/sandboxed-api.git
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dbaf95c724
This change should make it less confusing where utility code comes from. Having it in two places made sense when we were debating whether to publish Sandbox2 separately, but not any longer. Follow-up changes will move `sandbox2/util.h` and rename the remaining `sandbox2/util` folder. PiperOrigin-RevId: 351601640 Change-Id: I6256845261f610e590c25e2c59851cc51da2d778
106 lines
3.0 KiB
C++
106 lines
3.0 KiB
C++
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "sandboxed_api/embed_file.h"
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <glog/logging.h>
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#include "absl/status/status.h"
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#include "absl/strings/str_cat.h"
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#include "absl/strings/string_view.h"
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#include "sandboxed_api/sandbox2/util.h"
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#include "sandboxed_api/util/fileops.h"
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#include "sandboxed_api/util/raw_logging.h"
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#include "sandboxed_api/util/strerror.h"
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namespace sapi {
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EmbedFile* EmbedFile::GetEmbedFileSingleton() {
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static auto* embed_file_instance = new EmbedFile{};
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return embed_file_instance;
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}
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int EmbedFile::CreateFdForFileToc(const FileToc* toc) {
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// Create a memfd/temp file and write contents of the SAPI library to it.
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int embed_fd = -1;
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if (!sandbox2::util::CreateMemFd(&embed_fd, toc->name)) {
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SAPI_RAW_LOG(ERROR, "Couldn't create a temporary file for TOC name '%s'",
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toc->name);
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return -1;
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}
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if (!file_util::fileops::WriteToFD(embed_fd, toc->data, toc->size)) {
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SAPI_RAW_PLOG(ERROR, "Couldn't write SAPI embed file '%s' to memfd file",
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toc->name);
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close(embed_fd);
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return -1;
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}
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// Make the underlying file non-writeable.
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if (fchmod(embed_fd,
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S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) == -1) {
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SAPI_RAW_PLOG(ERROR, "Could't make FD=%d RX-only", embed_fd);
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close(embed_fd);
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return -1;
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}
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return embed_fd;
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}
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int EmbedFile::GetFdForFileToc(const FileToc* toc) {
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// Access to file_tocs_ must be guarded.
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absl::MutexLock lock{&file_tocs_mutex_};
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// If a file-descriptor for this toc already exists, just return it.
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auto entry = file_tocs_.find(toc);
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if (entry != file_tocs_.end()) {
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SAPI_RAW_VLOG(3,
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"Returning pre-existing embed file entry for '%s', fd: %d "
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"(orig name: '%s')",
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toc->name, entry->second, entry->first->name);
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return entry->second;
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}
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int embed_fd = CreateFdForFileToc(toc);
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if (embed_fd == -1) {
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SAPI_RAW_LOG(ERROR, "Cannot create a file for FileTOC: '%s'", toc->name);
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return -1;
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}
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SAPI_RAW_VLOG(1, "Created new embed file entry for '%s' with fd: %d",
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toc->name, embed_fd);
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file_tocs_[toc] = embed_fd;
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return embed_fd;
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}
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int EmbedFile::GetDupFdForFileToc(const FileToc* toc) {
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int fd = GetFdForFileToc(toc);
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if (fd == -1) {
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return -1;
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}
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fd = dup(fd);
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if (fd == -1) {
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SAPI_RAW_PLOG(ERROR, "dup failed");
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}
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return fd;
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}
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} // namespace sapi
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