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os: document that Chdir affects fs.FS returned by DirFS with a relative path

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Fixes #47214.

Change-Id: I6fdc1c4340c0943b825ac22e311179ad1cf30915
Reviewed-on: https://go-review.googlesource.com/c/go/+/410334
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
This commit is contained in:
Dan Kortschak 2022-06-03 20:51:26 +09:30 committed by Gopher Robot
parent 30b929b1ef
commit b72a6a7b86
1 changed files with 4 additions and 2 deletions
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6
src/os/file.go
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@ -620,8 +620,10 @@ func isWindowsNulName(name string) bool {
// operating system will begin with "/prefix": DirFS("/prefix").Open("file") is the
// same as os.Open("/prefix/file"). So if /prefix/file is a symbolic link pointing outside
// the /prefix tree, then using DirFS does not stop the access any more than using
// os.Open does. DirFS is therefore not a general substitute for a chroot-style security
// mechanism when the directory tree contains arbitrary content.
// os.Open does. Additionally, the root of the fs.FS returned for a relative path,
// DirFS("prefix"), will be affected by later calls to Chdir. DirFS is therefore not
// a general substitute for a chroot-style security mechanism when the directory tree
// contains arbitrary content.
//
// The result implements fs.StatFS.
func DirFS(dir string) fs.FS {