The btrfs_xattr_set_acl function in fs/btrfs/acl.c in btrfs in the
Linux kernel 2.6.34 and earlier does not check file ownership before
setting an ACL, which allows local users to bypass file permissions by
setting arbitrary ACLs, as demonstrated using setfacl.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MLIST:[linux-kernel] 20100518 [PATCH] btrfs: should add a permission check for setfacl
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