xfs_repair: allow '/' in attribute names
For some reason, since the earliest days of XFS, a '/' character
in an extended attribute name has been treated as corruption by
xfs_repair. This despite nothing in other userspace tools or the
kernel having this restriction.
My best guess is that this was an unintentional leftover from
common code between dirs & attrs in the "da" code, and there has
never been a good reason for it.
Since userspace and kernelspace allow such a name to be set,
listed, and read, it seems wrong to flag it as corruption.
So, make this test conditional on whether we're validating a name
in a dir, as opposed to the name of an attr.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
diff --git a/repair/attr_repair.c b/repair/attr_repair.c
index 1d04500..5ad81c0 100644
--- a/repair/attr_repair.c
+++ b/repair/attr_repair.c
@@ -122,6 +122,14 @@
* fork being emptied and put in shortform format.
*/
+static int
+attr_namecheck(
+ uint8_t *name,
+ int length)
+{
+ return namecheck((char *)name, length, false);
+}
+
/*
* This routine just checks what security needs are for attribute values
* only called when root flag is set, otherwise these names could exist in
@@ -292,11 +300,9 @@
}
}
- /* namecheck checks for / and null terminated for file names.
- * attributes names currently follow the same rules.
- */
- if (namecheck((char *)¤tentry->nameval[0],
- currententry->namelen)) {
+ /* namecheck checks for null chars in attr names. */
+ if (attr_namecheck(currententry->nameval,
+ currententry->namelen)) {
do_warn(
_("entry contains illegal character in shortform attribute name\n"));
junkit = 1;
@@ -458,7 +464,7 @@
xfs_attr_leaf_name_local_t *local;
local = xfs_attr3_leaf_name_local(leaf, i);
- if (local->namelen == 0 || namecheck((char *)&local->nameval[0],
+ if (local->namelen == 0 || attr_namecheck(local->nameval,
local->namelen)) {
do_warn(
_("attribute entry %d in attr block %u, inode %" PRIu64 " has bad name (namelen = %d)\n"),
@@ -513,7 +519,7 @@
remotep = xfs_attr3_leaf_name_remote(leaf, i);
- if (remotep->namelen == 0 || namecheck((char *)&remotep->name[0],
+ if (remotep->namelen == 0 || attr_namecheck(remotep->name,
remotep->namelen) ||
be32_to_cpu(entry->hashval) !=
libxfs_da_hashname((unsigned char *)&remotep->name[0],
diff --git a/repair/da_util.c b/repair/da_util.c
index 1450767..c5e690c 100644
--- a/repair/da_util.c
+++ b/repair/da_util.c
@@ -13,20 +13,26 @@
#include "da_util.h"
/*
- * takes a name and length (name need not be null-terminated)
- * and returns 1 if the name contains a '/' or a \0, returns 0
- * otherwise
+ * Takes a name and length (name need not be null-terminated) and whether
+ * we are checking a dir (as opposed to an attr).
+ * Returns 1 if the name contains a NUL or if a directory entry contains a '/'.
+ * Returns 0 if the name checks out.
*/
int
-namecheck(char *name, int length)
+namecheck(
+ char *name,
+ int length,
+ bool isadir)
{
- char *c;
- int i;
+ char *c;
+ int i;
ASSERT(length < MAXNAMELEN);
for (c = name, i = 0; i < length; i++, c++) {
- if (*c == '/' || *c == '\0')
+ if (isadir && *c == '/')
+ return 0;
+ if (*c == '\0')
return 1;
}
diff --git a/repair/da_util.h b/repair/da_util.h
index d36dfd0..041dff7 100644
--- a/repair/da_util.h
+++ b/repair/da_util.h
@@ -27,7 +27,8 @@
int
namecheck(
char *name,
- int length);
+ int length,
+ bool isadir);
struct xfs_buf *
da_read_buf(
diff --git a/repair/dir2.c b/repair/dir2.c
index e67ec59..094ecb3 100644
--- a/repair/dir2.c
+++ b/repair/dir2.c
@@ -44,6 +44,14 @@
l->ino = ino;
}
+static int
+dir_namecheck(
+ uint8_t *name,
+ int length)
+{
+ return namecheck((char *)name, length, true);
+}
+
int
dir2_is_badino(
xfs_ino_t ino)
@@ -310,7 +318,7 @@
* the length value is stored in a byte
* so it can't be too big, it can only wrap
*/
- if (namecheck((char *)&sfep->name[0], namelen)) {
+ if (dir_namecheck(sfep->name, namelen)) {
/*
* junk entry
*/
@@ -781,7 +789,7 @@
* during phase 4.
*/
junkit = dep->name[0] == '/';
- nm_illegal = namecheck((char *)dep->name, dep->namelen);
+ nm_illegal = dir_namecheck(dep->name, dep->namelen);
if (ino_discovery && nm_illegal) {
do_warn(
_("entry at block %u offset %" PRIdPTR " in directory inode %" PRIu64 " has illegal name \"%*.*s\": "),
