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xfs: fix misuse of the XFS_ATTR_INCOMPLETE flag

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XFS_ATTR_INCOMPLETE is a flag in the on-disk attribute format, and thus
in a different namespace as the ATTR_* flags in xfs_da_args.flags.
Switch to using a XFS_DA_OP_INCOMPLETE flag in op_flags instead.  Without
this users might be able to inject this flag into operations using the
attr by handle ioctl.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2020-01-07 15:25:39 -08:00 committed by Darrick J. Wong
parent 8cde9f259c
commit 780d290577
4 changed files with 6 additions and 6 deletions
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2
fs/xfs/libxfs/xfs_attr.c
View File

@ -1007,7 +1007,7 @@ restart:
* The INCOMPLETE flag means that we will find the "old"
* attr, not the "new" one.
*/
args->flags |= XFS_ATTR_INCOMPLETE;
args->op_flags |= XFS_DA_OP_INCOMPLETE;
state = xfs_da_state_alloc();
state->args = args;
state->mp = mp;

4
fs/xfs/libxfs/xfs_attr_leaf.c
View File

@ -2403,8 +2403,8 @@ xfs_attr3_leaf_lookup_int(
* If we are looking for INCOMPLETE entries, show only those.
* If we are looking for complete entries, show only those.
*/
if ((args->flags & XFS_ATTR_INCOMPLETE) !=
(entry->flags & XFS_ATTR_INCOMPLETE)) {
if (!!(args->op_flags & XFS_DA_OP_INCOMPLETE) !=
!!(entry->flags & XFS_ATTR_INCOMPLETE)) {
continue;
}
if (entry->flags & XFS_ATTR_LOCAL) {

4
fs/xfs/libxfs/xfs_da_btree.h
View File

@ -89,6 +89,7 @@ typedef struct xfs_da_args {
#define XFS_DA_OP_OKNOENT 0x0008 /* lookup/add op, ENOENT ok, else die */
#define XFS_DA_OP_CILOOKUP 0x0010 /* lookup to return CI name if found */
#define XFS_DA_OP_ALLOCVAL 0x0020 /* lookup to alloc buffer if found */
#define XFS_DA_OP_INCOMPLETE 0x0040 /* lookup INCOMPLETE attr keys */
#define XFS_DA_OP_FLAGS \
{ XFS_DA_OP_JUSTCHECK, "JUSTCHECK" }, \
@ -96,7 +97,8 @@ typedef struct xfs_da_args {
{ XFS_DA_OP_ADDNAME, "ADDNAME" }, \
{ XFS_DA_OP_OKNOENT, "OKNOENT" }, \
{ XFS_DA_OP_CILOOKUP, "CILOOKUP" }, \
{ XFS_DA_OP_ALLOCVAL, "ALLOCVAL" }
{ XFS_DA_OP_ALLOCVAL, "ALLOCVAL" }, \
{ XFS_DA_OP_INCOMPLETE, "INCOMPLETE" }
/*
* Storage for holding state during Btree searches and split/join ops.

2
fs/xfs/libxfs/xfs_da_format.h
View File

@ -683,8 +683,6 @@ struct xfs_attr3_leafblock {
/*
* Flags used in the leaf_entry[i].flags field.
* NOTE: the INCOMPLETE bit must not collide with the flags bits specified
* on the system call, they are "or"ed together for various operations.
*/
#define XFS_ATTR_LOCAL_BIT 0 /* attr is stored locally */
#define XFS_ATTR_ROOT_BIT 1 /* limit access to trusted attrs */