Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 06/50] ovl: perform vfs_getxattr() with mounter creds | Date | Mon, 22 Feb 2021 13:12:57 +0100 |
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From: Miklos Szeredi <mszeredi@redhat.com>
[ Upstream commit 554677b97257b0b69378bd74e521edb7e94769ff ]
The vfs_getxattr() in ovl_xattr_set() is used to check whether an xattr exist on a lower layer file that is to be removed. If the xattr does not exist, then no need to copy up the file.
This call of vfs_getxattr() wasn't wrapped in credential override, and this is probably okay. But for consitency wrap this instance as well.
Reported-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- fs/overlayfs/inode.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index 8b3c284ce92ea..08e60a6df77c3 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -340,7 +340,9 @@ int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name, goto out; if (!value && !upperdentry) { + old_cred = ovl_override_creds(dentry->d_sb); err = vfs_getxattr(realdentry, name, NULL, 0); + revert_creds(old_cred); if (err < 0) goto out_drop_write; } -- 2.27.0
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