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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     Miklos Szeredi <mszeredi@redhat.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.4 099/167] ovl: filter trusted xattr for
 non-admin
Thread-Topic: [PATCH AUTOSEL for 4.4 099/167] ovl: filter trusted xattr for
 non-admin
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Date:   Mon, 19 Mar 2018 16:07:25 +0000
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From: Miklos Szeredi <mszeredi@redhat.com>

[ Upstream commit a082c6f680da298cf075886ff032f32ccb7c5e1a ]

Filesystems filter out extended attributes in the "trusted." domain for
unprivlieged callers.

Overlay calls underlying filesystem's method with elevated privs, so need
to do the filtering in overlayfs too.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 fs/overlayfs/inode.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 220b04f04523..985a4cdae06d 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -272,6 +272,16 @@ ssize_t ovl_getxattr(struct dentry *dentry, const char=
 *name,
 	return vfs_getxattr(realpath.dentry, name, value, size);
 }
=20
+static bool ovl_can_list(const char *s)
+{
+	/* List all non-trusted xatts */
+	if (strncmp(s, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) !=3D 0)
+		return true;
+
+	/* Never list trusted.overlay, list other trusted for superuser only */
+	return !ovl_is_private_xattr(s) && capable(CAP_SYS_ADMIN);
+}
+
 ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size)
 {
 	struct path realpath;
@@ -296,7 +306,7 @@ ssize_t ovl_listxattr(struct dentry *dentry, char *list=
, size_t size)
 			return -EIO;
=20
 		len -=3D slen;
-		if (ovl_is_private_xattr(s)) {
+		if (!ovl_can_list(s)) {
 			res -=3D slen;
 			memmove(s, s + slen, len);
 		} else {
--=20
2.14.1