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https://github.com/podman-container-tools/podman.git
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df4905d68b
Fixes: https://issues.redhat.com/browse/RUN-3578 Signed-off-by: Nicola Sella <nsella@redhat.com>
42 lines
1.6 KiB
Go
42 lines
1.6 KiB
Go
// SPDX-License-Identifier: MPL-2.0
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//go:build linux && !libpathrs
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// Copyright (C) 2024-2025 Aleksa Sarai <cyphar@cyphar.com>
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// Copyright (C) 2024-2025 SUSE LLC
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at https://mozilla.org/MPL/2.0/.
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package pathrs
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import (
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"os"
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"github.com/cyphar/filepath-securejoin/pathrs-lite/internal/gopathrs"
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"github.com/cyphar/filepath-securejoin/pathrs-lite/internal/procfs"
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)
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// OpenatInRoot is equivalent to [OpenInRoot], except that the root is provided
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// using an *[os.File] handle, to ensure that the correct root directory is used.
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func OpenatInRoot(root *os.File, unsafePath string) (*os.File, error) {
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return gopathrs.OpenatInRoot(root, unsafePath)
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}
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// Reopen takes an *[os.File] handle and re-opens it through /proc/self/fd.
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// Reopen(file, flags) is effectively equivalent to
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//
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// fdPath := fmt.Sprintf("/proc/self/fd/%d", file.Fd())
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// os.OpenFile(fdPath, flags|unix.O_CLOEXEC)
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//
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// But with some extra hardenings to ensure that we are not tricked by a
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// maliciously-configured /proc mount. While this attack scenario is not
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// common, in container runtimes it is possible for higher-level runtimes to be
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// tricked into configuring an unsafe /proc that can be used to attack file
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// operations. See [CVE-2019-19921] for more details.
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//
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// [CVE-2019-19921]: https://github.com/advisories/GHSA-fh74-hm69-rqjw
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func Reopen(handle *os.File, flags int) (*os.File, error) {
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return procfs.ReopenFd(handle, flags)
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}
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