Date: Tue, 14 Mar 2006 15:02:42 +0200 From: Kostik Belousov <kostikbel@gmail.com> To: David Xu <davidxu@freebsd.org>, freebsd-stable@freebsd.org, Martin <nakal@nurfuerspam.de>, bug-followup@freebsd.org Subject: Re: [patch] Re: kern/94278: Crash with FIFOs and ktrace Message-ID: <20060314130242.GN37572@deviant.kiev.zoral.com.ua> In-Reply-To: <20060314120153.GL37572@deviant.kiev.zoral.com.ua> References: <200603111140.k2BBerFh096411@freefall.freebsd.org> <200603140744.34246.davidxu@freebsd.org> <4416705A.50708@nurfuerspam.de> <200603141641.32705.davidxu@freebsd.org> <20060314120153.GL37572@deviant.kiev.zoral.com.ua>
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[-- Attachment #1 --]
Sorry for garbled patch. I do not know why mutt decided to encode
some "=" as =3D.
Index: compat/linux/linux_misc.c
===================================================================
RCS file: /usr/local/arch/ncvs/src/sys/compat/linux/linux_misc.c,v
retrieving revision 1.172
diff -u -r1.172 linux_misc.c
--- compat/linux/linux_misc.c 28 Dec 2005 07:08:54 -0000 1.172
+++ compat/linux/linux_misc.c 14 Mar 2006 11:45:57 -0000
@@ -310,6 +310,21 @@
* XXX: This should use vn_open() so that it is properly authorized,
* and to reduce code redundancy all over the place here.
*/
+ if (vp->v_type == VLNK) {
+ error = EMLINK;
+ goto cleanup;
+ }
+ if (vp->v_type == VSOCK) {
+ error = EOPNOTSUPP;
+ goto cleanup;
+ }
+ if (vp->v_type == VFIFO) {
+ /* Due to way fifo works (by overloading f_ops),
+ * tricking kernel into write to the fifo leads to
+ * panic. Make a band-aid to filter the case. */
+ error = EOPNOTSUPP;
+ goto cleanup;
+ }
#ifdef MAC
error = mac_check_vnode_open(td->td_ucred, vp, FREAD);
if (error)
Index: fs/fifofs/fifo_vnops.c
===================================================================
RCS file: /usr/local/arch/ncvs/src/sys/fs/fifofs/fifo_vnops.c,v
retrieving revision 1.132
diff -u -r1.132 fifo_vnops.c
--- fs/fifofs/fifo_vnops.c 1 Oct 2005 20:15:41 -0000 1.132
+++ fs/fifofs/fifo_vnops.c 14 Mar 2006 11:46:07 -0000
@@ -168,6 +168,7 @@
int a_mode;
struct ucred *a_cred;
struct thread *a_td;
+ int a_fdidx;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
Index: kern/vfs_syscalls.c
===================================================================
RCS file: /usr/local/arch/ncvs/src/sys/kern/vfs_syscalls.c,v
retrieving revision 1.411
diff -u -r1.411 vfs_syscalls.c
--- kern/vfs_syscalls.c 4 Mar 2006 00:09:09 -0000 1.411
+++ kern/vfs_syscalls.c 14 Mar 2006 11:46:10 -0000
@@ -4101,6 +4101,13 @@
error = EOPNOTSUPP;
goto bad;
}
+ if (vp->v_type == VFIFO) {
+ /* Due to way fifo works (by overloading f_ops),
+ * tricking kernel into write to the fifo leads to
+ * panic. Make a band-aid to filter the case. */
+ error = EOPNOTSUPP;
+ goto bad;
+ }
mode = 0;
if (fmode & (FWRITE | O_TRUNC)) {
if (vp->v_type == VDIR) {
Index: kern/vfs_vnops.c
===================================================================
RCS file: /usr/local/arch/ncvs/src/sys/kern/vfs_vnops.c,v
retrieving revision 1.238
diff -u -r1.238 vfs_vnops.c
--- kern/vfs_vnops.c 11 Mar 2006 17:14:05 -0000 1.238
+++ kern/vfs_vnops.c 14 Mar 2006 11:46:10 -0000
@@ -194,6 +194,13 @@
error = EOPNOTSUPP;
goto bad;
}
+ if ((vp->v_type == VFIFO) && (fdidx < 0)) {
+ /* Due to way fifo works (by overloading f_ops),
+ * tricking kernel into write to the fifo leads to
+ * panic. Make a band-aid to filter the case. */
+ error = EOPNOTSUPP;
+ goto bad;
+ }
mode = 0;
if (fmode & (FWRITE | O_TRUNC)) {
if (vp->v_type == VDIR) {
[-- Attachment #2 --]
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.2.2 (FreeBSD)
iD8DBQFEFr7vC3+MBN1Mb4gRAh9JAJsEEgDWtQU4mG+fcV+hp/VcXKmp/QCfUntI
XiXFoulphhvY5fn8XGoLCTM=
=KV3e
-----END PGP SIGNATURE-----
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