Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Properly handle updates of variably-sized SA entries.
During the update process in sa_modify_attrs(), the sizes of existing variably-sized SA entries are obtained from sa_lengths[]. The case where a variably-sized SA was being replaced neglected to increment the index into sa_lengths[], so subsequent variable-length SAs would be rewritten with the wrong length. This patch adds the missing increment operation so all variably-sized SA entries are stored with their correct lengths. Previously, a size-changing update of a variably-sized SA that occurred when there were other variably-sized SAs in the bonus buffer would cause the subsequent SAs to be corrupted. The most common case in which this would occur is when a mode change caused the ZPL_DACL_ACES entry to change size when a ZPL_DXATTR (SA xattr) entry already existed. The following sequence would have caused a failure when xattr=sa was in force and would corrupt the bonus buffer: open(filename, O_WRONLY | O_CREAT, 0600); ... lsetxattr(filename, ...); /* create xattr SA */ chmod(filename, 0650); /* enlarges the ACL */ Signed-off-by: Chris Dunlop <[email protected]> Signed-off-by: Ned Bass <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #1978
- Loading branch information