>Number: 185232
>Category: kern
>Synopsis: Kernel page fault in jailed() via vn_stat() when using uio_td
>from nfsrv_read()
>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: Fri Dec 27 16:20:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator: Greg Becker
>Release: 9.2
>Organization:
NetApp
>Environment:
FreeBSD perf-filer-1.stl.netapp.com 9.2-STABLE FreeBSD 9.2-STABLE #69 r259677M:
Fri Dec 27 06:15:18 CST 2013
[email protected]:/usr/obj/usr/src/sys/PERFFILER1 amd64
>Description:
I'm using a custom nullfs that calls vn_stat() from my null_read() function.
The problem is, nfsrv_read() doesn't set uio_td, so my null_read() function
gets whatever was on the caller's stack.
>How-To-Repeat:
>Fix:
Either don't use uio_td when being called from nfssrv_read(), or set uio_td to
NULL in nfssrv_read().
Patch attached with submission follows:
Index: sys/nfsserver/nfs_serv.c
===================================================================
--- sys/nfsserver/nfs_serv.c (revision 259677)
+++ sys/nfsserver/nfs_serv.c (working copy)
@@ -965,6 +965,7 @@
uiop->uio_resid = len;
uiop->uio_rw = UIO_READ;
uiop->uio_segflg = UIO_SYSSPACE;
+ uiop->uio_td = NULL;
nh = nfsrv_sequential_heuristic(uiop, vp);
ioflag |= nh->nh_seqcount << IO_SEQSHIFT;
error = VOP_READ(vp, uiop, IO_NODELOCKED | ioflag, cred);
>Release-Note:
>Audit-Trail:
>Unformatted:
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