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authorTheodore Ts'o <tytso@mit.edu>2018-06-16 22:40:48 +0300
committerTheodore Ts'o <tytso@mit.edu>2018-06-16 22:40:48 +0300
commit8cdb5240ec5928b20490a2bb34cb87e9a5f40226 (patch)
treec8ecb3fb14d781cc8ccf13ef4a1ca2b4b9a78f86 /fs/ext4
parent6e8ab72a812396996035a37e5ca4b3b99b5d214b (diff)
downloadlinux-8cdb5240ec5928b20490a2bb34cb87e9a5f40226.tar.xz
ext4: never move the system.data xattr out of the inode body
When expanding the extra isize space, we must never move the system.data xattr out of the inode body. For performance reasons, it doesn't make any sense, and the inline data implementation assumes that system.data xattr is never in the external xattr block. This addresses CVE-2018-10880 https://bugzilla.kernel.org/show_bug.cgi?id=200005 Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/xattr.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 0263692979ec..72377b77fbd7 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -2657,6 +2657,11 @@ static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode,
last = IFIRST(header);
/* Find the entry best suited to be pushed into EA block */
for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
+ /* never move system.data out of the inode */
+ if ((last->e_name_len == 4) &&
+ (last->e_name_index == EXT4_XATTR_INDEX_SYSTEM) &&
+ !memcmp(last->e_name, "data", 4))
+ continue;
total_size = EXT4_XATTR_LEN(last->e_name_len);
if (!last->e_value_inum)
total_size += EXT4_XATTR_SIZE(