kern/151629: [fs] [patch] Skip empty directory entries during na
>Number: 151629
>Category: kern
>Synopsis: [fs] [patch] Skip empty directory entries during name lookup (unionfs, dirent_exists())
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Oct 21 17:20:11 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator: Gleb Kurtsou
>Release:
>Organization:
>Environment:
FreeBSD tops 9.0-CURRENT FreeBSD 9.0-CURRENT #25 r212049+d758796
>Description:
At least UFS and EXT2 use "empty" directory entries, i.e. dirent with zero d_fileno, as a placeholder for removed entries.
Such entries are skipped by libc and elsewhere in the kernel.
>How-To-Repeat:
>Fix:
Patch attached with submission follows:
commit 2a41d458eff5cde0ae15bf72f3d62c9a6630d618
Author: Gleb Kurtsou <gleb.kurtsou@gmail.com>
Date: Sun Oct 17 23:40:11 2010 +0300
Skip empty directory entries (entries with zero inode number) during name lookup
diff --git a/sys/fs/unionfs/union_subr.c b/sys/fs/unionfs/union_subr.c
index 2e74844..ccd97cd 100644
--- a/sys/fs/unionfs/union_subr.c
+++ b/sys/fs/unionfs/union_subr.c
@@ -1177,7 +1177,7 @@ unionfs_check_rmdir(struct vnode *vp, struct ucred *cred, struct thread *td)
edp = (struct dirent*)&buf[sizeof(buf) - uio.uio_resid];
for (dp = (struct dirent*)buf; !error && dp < edp;
dp = (struct dirent*)((caddr_t)dp + dp->d_reclen)) {
- if (dp->d_type == DT_WHT ||
+ if (dp->d_type == DT_WHT || dp->d_fileno == 0 ||
(dp->d_namlen == 1 && dp->d_name[0] == '.') ||
(dp->d_namlen == 2 && !bcmp(dp->d_name, "..", 2)))
continue;
diff --git a/sys/kern/vfs_default.c b/sys/kern/vfs_default.c
index 195e735..9e2ec90 100644
--- a/sys/kern/vfs_default.c
+++ b/sys/kern/vfs_default.c
@@ -338,7 +338,7 @@ dirent_exists(struct vnode *vp, const char *dirname, struct thread *td)
if (error)
goto out;
- if ((dp->d_type != DT_WHT) &&
+ if (dp->d_type != DT_WHT && dp->d_fileno != 0 &&
!strcmp(dp->d_name, dirname)) {
found = 1;
goto out;
>Release-Note:
>Audit-Trail:
>Unformatted:
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