From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Miklos Szeredi <mszeredi@redhat.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Sasha Levin <sashal@kernel.org>,
linux-unionfs@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 04/14] ovl: perform vfs_getxattr() with mounter creds
Date: Mon, 8 Feb 2021 12:59:16 -0500 [thread overview]
Message-ID: <20210208175926.2092211-4-sashal@kernel.org> (raw)
In-Reply-To: <20210208175926.2092211-1-sashal@kernel.org>
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
next parent reply other threads:[~2021-02-08 18:05 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20210208175926.2092211-1-sashal@kernel.org>
2021-02-08 17:59 ` Sasha Levin [this message]
2021-02-08 17:59 ` [PATCH AUTOSEL 4.19 06/14] ovl: skip getxattr of security labels Sasha Levin
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