Module Name: src
Committed By: riastradh
Date: Tue May 9 12:04:04 UTC 2023
Modified Files:
src/sys/dev/dkwedge: dk.c
src/sys/kern: subr_disk.c
src/sys/sys: disk.h
Log Message:
ioctl(DIOCRMWEDGES): Delete only idle wedges.
Don't forcibly delete busy wedges.
Reported-by: syzbot+e46f31fe56e04f567...@syzkaller.appspotmail.com
https://syzkaller.appspot.com/bug?id=8a00fd7f2e7459748d7a274098180a4708ff0f61
Fixes accidental destruction of the busy wedge that the root file
system is mounted on, triggered by syzbot's ioctl(DIOCRMWEDGES).
To generate a diff of this commit:
cvs rdiff -u -r1.153 -r1.154 src/sys/dev/dkwedge/dk.c
cvs rdiff -u -r1.136 -r1.137 src/sys/kern/subr_disk.c
cvs rdiff -u -r1.77 -r1.78 src/sys/sys/disk.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/dev/dkwedge/dk.c
diff -u src/sys/dev/dkwedge/dk.c:1.153 src/sys/dev/dkwedge/dk.c:1.154
--- src/sys/dev/dkwedge/dk.c:1.153 Tue May 9 12:03:55 2023
+++ src/sys/dev/dkwedge/dk.c Tue May 9 12:04:04 2023
@@ -1,4 +1,4 @@
-/* $NetBSD: dk.c,v 1.153 2023/05/09 12:03:55 riastradh Exp $ */
+/* $NetBSD: dk.c,v 1.154 2023/05/09 12:04:04 riastradh Exp $ */
/*-
* Copyright (c) 2004, 2005, 2006, 2007 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: dk.c,v 1.153 2023/05/09 12:03:55 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: dk.c,v 1.154 2023/05/09 12:04:04 riastradh Exp $");
#ifdef _KERNEL_OPT
#include "opt_dkwedge.h"
@@ -774,14 +774,27 @@ dkwedge_detach(device_t self, int flags)
/*
* dkwedge_delall: [exported function]
*
- * Delete all of the wedges on the specified disk. Used when
- * a disk is being detached.
+ * Forcibly delete all of the wedges on the specified disk. Used
+ * when a disk is being detached.
*/
void
dkwedge_delall(struct disk *pdk)
{
- dkwedge_delall1(pdk, false);
+ dkwedge_delall1(pdk, /*idleonly*/false);
+}
+
+/*
+ * dkwedge_delidle: [exported function]
+ *
+ * Delete all of the wedges on the specified disk if idle. Used
+ * by ioctl(DIOCRMWEDGES).
+ */
+void
+dkwedge_delidle(struct disk *pdk)
+{
+
+ dkwedge_delall1(pdk, /*idleonly*/true);
}
static void
@@ -1065,7 +1078,7 @@ dkwedge_discover(struct disk *pdk)
/*
* Remove unused wedges
*/
- dkwedge_delall1(pdk, true);
+ dkwedge_delidle(pdk);
/*
* For each supported partition map type, look to see if
Index: src/sys/kern/subr_disk.c
diff -u src/sys/kern/subr_disk.c:1.136 src/sys/kern/subr_disk.c:1.137
--- src/sys/kern/subr_disk.c:1.136 Sat Apr 22 11:58:01 2023
+++ src/sys/kern/subr_disk.c Tue May 9 12:04:04 2023
@@ -1,4 +1,4 @@
-/* $NetBSD: subr_disk.c,v 1.136 2023/04/22 11:58:01 riastradh Exp $ */
+/* $NetBSD: subr_disk.c,v 1.137 2023/05/09 12:04:04 riastradh Exp $ */
/*-
* Copyright (c) 1996, 1997, 1999, 2000, 2009 The NetBSD Foundation, Inc.
@@ -67,7 +67,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: subr_disk.c,v 1.136 2023/04/22 11:58:01 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: subr_disk.c,v 1.137 2023/05/09 12:04:04 riastradh Exp $");
#include <sys/param.h>
#include <sys/kernel.h>
@@ -655,7 +655,7 @@ disk_ioctl(struct disk *dk, dev_t dev, u
if ((flag & FWRITE) == 0)
return EBADF;
- dkwedge_delall(dk);
+ dkwedge_delidle(dk);
return 0;
default:
Index: src/sys/sys/disk.h
diff -u src/sys/sys/disk.h:1.77 src/sys/sys/disk.h:1.78
--- src/sys/sys/disk.h:1.77 Sat Jul 24 21:31:39 2021
+++ src/sys/sys/disk.h Tue May 9 12:04:04 2023
@@ -1,4 +1,4 @@
-/* $NetBSD: disk.h,v 1.77 2021/07/24 21:31:39 andvar Exp $ */
+/* $NetBSD: disk.h,v 1.78 2023/05/09 12:04:04 riastradh Exp $ */
/*-
* Copyright (c) 1996, 1997, 2004 The NetBSD Foundation, Inc.
@@ -552,6 +552,7 @@ void dkwedge_init(void);
int dkwedge_add(struct dkwedge_info *);
int dkwedge_del(struct dkwedge_info *);
void dkwedge_delall(struct disk *);
+void dkwedge_delidle(struct disk *);
int dkwedge_list(struct disk *, struct dkwedge_list *, struct lwp *);
void dkwedge_discover(struct disk *);
int dkwedge_read(struct disk *, struct vnode *, daddr_t, void *, size_t);
