From: Theodore Ts'o Date: Sat, 16 Jun 2018 19:40:48 +0000 (-0400) Subject: ext4: never move the system.data xattr out of the inode body X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8a9ef17c0dc93def47e17b227ada95c682592a1d;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git ext4: never move the system.data xattr out of the inode body commit 8cdb5240ec5928b20490a2bb34cb87e9a5f40226 upstream. 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 Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index 871278eac8ba..e2fa3adb4b7b 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -2656,6 +2656,11 @@ 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(