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| author | Ayush Ranjan <ayushranjan@google.com> | 2021-02-05 17:14:59 -0800 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2021-02-05 17:17:30 -0800 |
| commit | 09afd68326898f783927c65f86f813d815d8c16c (patch) | |
| tree | 4cea9f27b4d37f15441aadae7c1bc5f5f5a9ec8a /pkg/sentry/fsimpl/kernfs | |
| parent | 24416032ab848cff7696b3f37e4c18220aeee2c0 (diff) | |
[vfs] Handle `.` and `..` as last path component names in kernfs Rename.
According to vfs.FilesystemImpl.RenameAt documentation:
- If the last path component in rp is "." or "..", and opts.Flags contains
RENAME_NOREPLACE, RenameAt returns EEXIST.
- If the last path component in rp is "." or "..", and opts.Flags does not
contain RENAME_NOREPLACE, RenameAt returns EBUSY.
Reported-by: syzbot+6189786e64fe13fe43f8@syzkaller.appspotmail.com
PiperOrigin-RevId: 355959266
Diffstat (limited to 'pkg/sentry/fsimpl/kernfs')
| -rw-r--r-- | pkg/sentry/fsimpl/kernfs/filesystem.go | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/pkg/sentry/fsimpl/kernfs/filesystem.go b/pkg/sentry/fsimpl/kernfs/filesystem.go index a7a553619..d6dd6bc41 100644 --- a/pkg/sentry/fsimpl/kernfs/filesystem.go +++ b/pkg/sentry/fsimpl/kernfs/filesystem.go @@ -668,6 +668,12 @@ func (fs *Filesystem) RenameAt(ctx context.Context, rp *vfs.ResolvingPath, oldPa // Can we create the dst dentry? var dst *Dentry pc := rp.Component() + if pc == "." || pc == ".." { + if noReplace { + return syserror.EEXIST + } + return syserror.EBUSY + } switch err := checkCreateLocked(ctx, rp.Credentials(), pc, dstDir); err { case nil: // Ok, continue with rename as replacement. |