[PATCH 28/35] libxfs: apply utf-8 normalization rules to user extended attribute names

[Ben Myers <bpm@sgi.com>]

From: Olaf Weber <olaf@sgi.com>

Apply the same rules for UTF-8 normalization to the names of user-defined
extended attributes. System attributes are excluded because they are not
user-visible in the first place, and the kernel is expected to know what
it is doing when naming them.

Signed-off-by: Olaf Weber <olaf@sgi.com>
---
 libxfs/xfs_attr.c      | 49 +++++++++++++++++++++++++++++++++++++++++--------
 libxfs/xfs_attr_leaf.c | 11 +++++++++--
 libxfs/xfs_utf8.c      |  6 ++++++
 3 files changed, 56 insertions(+), 10 deletions(-)

diff --git a/libxfs/xfs_attr.c b/libxfs/xfs_attr.c
index 17519d3..c30703b 100644
--- a/libxfs/xfs_attr.c
+++ b/libxfs/xfs_attr.c
@@ -88,8 +88,9 @@ xfs_attr_get_int(
 	int			*valuelenp,
 	int			flags)
 {
-	xfs_da_args_t   args;
-	int             error;
+	xfs_da_args_t   	args;
+	struct xfs_mount	*mp = ip->i_mount;
+	int             	error;
 
 	if (!xfs_inode_hasattr(ip))
 		return ENOATTR;
@@ -103,9 +104,12 @@ xfs_attr_get_int(
 	args.value = value;
 	args.valuelen = *valuelenp;
 	args.flags = flags;
-	args.hashval = xfs_da_hashname(args.name, args.namelen);
 	args.dp = ip;
 	args.whichfork = XFS_ATTR_FORK;
+	if (! xfs_sb_version_hasutf8(&mp->m_sb))
+		args.hashval = xfs_da_hashname(args.name, args.namelen);
+	else if ((error = mp->m_dirnameops->normhash(&args)) != 0)
+		return error;
 
 	/*
 	 * Decide on what work routines to call based on the inode size.
@@ -118,6 +122,9 @@ xfs_attr_get_int(
 		error = xfs_attr_node_get(&args);
 	}
 
+	if (args.norm)
+		kmem_free((void *)args.norm);
+
 	/*
 	 * Return the number of bytes in the value to the caller.
 	 */
@@ -239,12 +246,15 @@ xfs_attr_set_int(
 	args.value = value;
 	args.valuelen = valuelen;
 	args.flags = flags;
-	args.hashval = xfs_da_hashname(args.name, args.namelen);
 	args.dp = dp;
 	args.firstblock = &firstblock;
 	args.flist = &flist;
 	args.whichfork = XFS_ATTR_FORK;
 	args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
+	if (! xfs_sb_version_hasutf8(&mp->m_sb))
+		args.hashval = xfs_da_hashname(args.name, args.namelen);
+	else if ((error = mp->m_dirnameops->normhash(&args)) != 0)
+		return error;
 
 	/* Size is now blocks for attribute data */
 	args.total = xfs_attr_calc_size(dp, name->len, valuelen, &local);
@@ -276,6 +286,8 @@ xfs_attr_set_int(
 	error = xfs_trans_reserve(args.trans, &tres, args.total, 0);
 	if (error) {
 		xfs_trans_cancel(args.trans, 0);
+		if (args.norm)
+			kmem_free((void *)args.norm);
 		return(error);
 	}
 	xfs_ilock(dp, XFS_ILOCK_EXCL);
@@ -286,6 +298,8 @@ xfs_attr_set_int(
 	if (error) {
 		xfs_iunlock(dp, XFS_ILOCK_EXCL);
 		xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
+		if (args.norm)
+			kmem_free((void *)args.norm);
 		return (error);
 	}
 
@@ -333,7 +347,8 @@ xfs_attr_set_int(
 			err2 = xfs_trans_commit(args.trans,
 						 XFS_TRANS_RELEASE_LOG_RES);
 			xfs_iunlock(dp, XFS_ILOCK_EXCL);
-
+			if (args.norm)
+				kmem_free((void *)args.norm);
 			return(error == 0 ? err2 : error);
 		}
 
@@ -398,6 +413,8 @@ xfs_attr_set_int(
 	xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
 	error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
 	xfs_iunlock(dp, XFS_ILOCK_EXCL);
+	if (args.norm)
+		kmem_free((void *)args.norm);
 
 	return(error);
 
@@ -406,6 +423,9 @@ out:
 		xfs_trans_cancel(args.trans,
 			XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
 	xfs_iunlock(dp, XFS_ILOCK_EXCL);
+	if (args.norm)
+		kmem_free((void *)args.norm);
+
 	return(error);
 }
 
@@ -452,12 +472,15 @@ xfs_attr_remove_int(xfs_inode_t *dp, struct xfs_name *name, int flags)
 	args.name = name->name;
 	args.namelen = name->len;
 	args.flags = flags;
-	args.hashval = xfs_da_hashname(args.name, args.namelen);
 	args.dp = dp;
 	args.firstblock = &firstblock;
 	args.flist = &flist;
 	args.total = 0;
 	args.whichfork = XFS_ATTR_FORK;
+	if (! xfs_sb_version_hasutf8(&mp->m_sb))
+		args.hashval = xfs_da_hashname(args.name, args.namelen);
+	else if ((error = mp->m_dirnameops->normhash(&args)) != 0)
+		return error;
 
 	/*
 	 * we have no control over the attribute names that userspace passes us
@@ -470,8 +493,11 @@ xfs_attr_remove_int(xfs_inode_t *dp, struct xfs_name *name, int flags)
 	 * Attach the dquots to the inode.
 	 */
 	error = xfs_qm_dqattach(dp, 0);
-	if (error)
-		return error;
+	if (error) {
+		if (args.norm)
+			kmem_free((void *)args.norm);
+			return error;
+	}
 
 	/*
 	 * Start our first transaction of the day.
@@ -497,6 +523,8 @@ xfs_attr_remove_int(xfs_inode_t *dp, struct xfs_name *name, int flags)
 				  XFS_ATTRRM_SPACE_RES(mp), 0);
 	if (error) {
 		xfs_trans_cancel(args.trans, 0);
+		if (args.norm)
+			kmem_free((void *)args.norm);
 		return(error);
 	}
 
@@ -546,6 +574,8 @@ xfs_attr_remove_int(xfs_inode_t *dp, struct xfs_name *name, int flags)
 	xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
 	error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
 	xfs_iunlock(dp, XFS_ILOCK_EXCL);
+	if (args.norm)
+		kmem_free((void *)args.norm);
 
 	return(error);
 
@@ -554,6 +584,9 @@ out:
 		xfs_trans_cancel(args.trans,
 			XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
 	xfs_iunlock(dp, XFS_ILOCK_EXCL);
+	if (args.norm)
+		kmem_free((void *)args.norm);
+
 	return(error);
 }
 
diff --git a/libxfs/xfs_attr_leaf.c b/libxfs/xfs_attr_leaf.c
index f7f02ae..052a6a1 100644
--- a/libxfs/xfs_attr_leaf.c
+++ b/libxfs/xfs_attr_leaf.c
@@ -634,6 +634,7 @@ int
 xfs_attr_shortform_to_leaf(xfs_da_args_t *args)
 {
 	xfs_inode_t *dp;
+	struct xfs_mount *mp;
 	xfs_attr_shortform_t *sf;
 	xfs_attr_sf_entry_t *sfe;
 	xfs_da_args_t nargs;
@@ -646,6 +647,7 @@ xfs_attr_shortform_to_leaf(xfs_da_args_t *args)
 	trace_xfs_attr_sf_to_leaf(args);
 
 	dp = args->dp;
+	mp = dp->i_mount;
 	ifp = dp->i_afp;
 	sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
 	size = be16_to_cpu(sf->hdr.totsize);
@@ -698,13 +700,18 @@ xfs_attr_shortform_to_leaf(xfs_da_args_t *args)
 		nargs.namelen = sfe->namelen;
 		nargs.value = &sfe->nameval[nargs.namelen];
 		nargs.valuelen = sfe->valuelen;
-		nargs.hashval = xfs_da_hashname(sfe->nameval,
-						sfe->namelen);
 		nargs.flags = XFS_ATTR_NSP_ONDISK_TO_ARGS(sfe->flags);
+		if (! xfs_sb_version_hasutf8(&mp->m_sb))
+			nargs.hashval = xfs_da_hashname(sfe->nameval,
+							sfe->namelen);
+		else if ((error = mp->m_dirnameops->normhash(&nargs)) != 0)
+			goto out;
 		error = xfs_attr3_leaf_lookup_int(bp, &nargs); /* set a->index */
 		ASSERT(error == ENOATTR);
 		error = xfs_attr3_leaf_add(bp, &nargs);
 		ASSERT(error != ENOSPC);
+		if (nargs.norm)
+			 kmem_free((void *)nargs.norm);
 		if (error)
 			goto out;
 		sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
diff --git a/libxfs/xfs_utf8.c b/libxfs/xfs_utf8.c
index 3be1fbb..f7042ef 100644
--- a/libxfs/xfs_utf8.c
+++ b/libxfs/xfs_utf8.c
@@ -109,6 +109,9 @@ xfs_utf8_normhash(
 	unsigned int	sb_utf8version =
 		args->dp->i_mount->m_sb.sb_utf8version;
 
+	/* Don't normalize system attribute names. */
+	if (args->flags & (ATTR_ROOT|ATTR_SECURE))
+		goto blob;
 	nfkdi = utf8nfkdi(sb_utf8version);
 	/* Failure to normalize is treated as a blob. */
 	if ((normlen = utf8nlen(nfkdi, args->name, args->namelen)) < 0)
@@ -213,6 +216,9 @@ xfs_utf8_ci_normhash(
 	unsigned int	sb_utf8version =
 		args->dp->i_mount->m_sb.sb_utf8version;
 
+	/* Don't normalize system attribute names. */
+	if (args->flags & (ATTR_ROOT|ATTR_SECURE))
+		goto blob;
 	nfkdicf = utf8nfkdicf(sb_utf8version);
 	/* Failure to normalize is treated as a blob. */
 	if ((normlen = utf8nlen(nfkdicf, args->name, args->namelen)) < 0)
-- 
1.7.12.4

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