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authorMiklos Szeredi <mszeredi@redhat.com>2017-05-29 15:15:27 +0200
committerMiklos Szeredi <mszeredi@redhat.com>2017-05-29 15:15:27 +0200
commita082c6f680da298cf075886ff032f32ccb7c5e1a (patch)
tree48a876fd1a7b738f978f5abbfc1e59bcbe288d43 /fs/overlayfs
parentf3a1568582cc207663a4d5e37da790334372855b (diff)
downloadlinux-a082c6f680da298cf075886ff032f32ccb7c5e1a.tar.bz2
ovl: filter trusted xattr for non-admin
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>
Diffstat (limited to 'fs/overlayfs')
-rw-r--r--fs/overlayfs/inode.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index ad9547f82da5..d613e2c41242 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -240,6 +240,16 @@ int ovl_xattr_get(struct dentry *dentry, const char *name,
return res;
}
+static bool ovl_can_list(const char *s)
+{
+ /* List all non-trusted xatts */
+ if (strncmp(s, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) != 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 dentry *realdentry = ovl_dentry_real(dentry);
@@ -263,7 +273,7 @@ ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size)
return -EIO;
len -= slen;
- if (ovl_is_private_xattr(s)) {
+ if (!ovl_can_list(s)) {
res -= slen;
memmove(s, s + slen, len);
} else {