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authorFilipe Manana <fdmanana@suse.com>2014-11-09 08:38:39 +0000
committerChris Mason <clm@fb.com>2014-11-20 17:20:07 -0800
commit5f5bc6b1e2d5a6f827bc860ef2dc5b6f365d1339 (patch)
treed17afbf1a528b003f34d43cf557d2da62a7a6b1b /fs/bad_inode.c
parentc7bc6319c59cc791743cf1b6e98f86be69444495 (diff)
Btrfs: make xattr replace operations atomic
Replacing a xattr consists of doing a lookup for its existing value, delete the current value from the respective leaf, release the search path and then finally insert the new value. This leaves a time window where readers (getxattr, listxattrs) won't see any value for the xattr. Xattrs are used to store ACLs, so this has security implications. This change also fixes 2 other existing issues which were: *) Deleting the old xattr value without verifying first if the new xattr will fit in the existing leaf item (in case multiple xattrs are packed in the same item due to name hash collision); *) Returning -EEXIST when the flag XATTR_CREATE is given and the xattr doesn't exist but we have have an existing item that packs muliple xattrs with the same name hash as the input xattr. In this case we should return ENOSPC. A test case for xfstests follows soon. Thanks to Alexandre Oliva for reporting the non-atomicity of the xattr replace implementation. Reported-by: Alexandre Oliva <oliva@gnu.org> Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/bad_inode.c')
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