Author: rmacklem
Date: Sun Feb 12 06:41:29 2012
New Revision: 231547
URL: http://svn.freebsd.org/changeset/base/231547
Log:
MFC: r231133
r228827 fixed a problem where copying of NFSv4 open credentials into
a credential structure would corrupt it. This happened when the
p argument was != NULL. However, I now realize that the copying of
open credentials should only happen for p == NULL, since that indicates
that it is a read-ahead or write-behind. This patch fixes this.
After this commit, r228827 could be reverted, but I think the code is
clearer and safer with the patch, so I am going to leave it in.
Without this patch, it was possible that a NFSv4 VOP_SETATTR() could have
changed the credentials of the caller. This would have happened if
the process doing the VOP_SETATTR() did not have the file open, but
some other process running as a different uid had the file open for writing
at the same time.
Modified:
stable/8/sys/fs/nfsclient/nfs_clstate.c
Directory Properties:
stable/8/sys/ (props changed)
stable/8/sys/amd64/include/xen/ (props changed)
stable/8/sys/boot/ (props changed)
stable/8/sys/cddl/contrib/opensolaris/ (props changed)
stable/8/sys/contrib/dev/acpica/ (props changed)
stable/8/sys/contrib/pf/ (props changed)
stable/8/sys/dev/e1000/ (props changed)
Modified: stable/8/sys/fs/nfsclient/nfs_clstate.c
==============================================================================
--- stable/8/sys/fs/nfsclient/nfs_clstate.c Sun Feb 12 06:27:59 2012
(r231546)
+++ stable/8/sys/fs/nfsclient/nfs_clstate.c Sun Feb 12 06:41:29 2012
(r231547)
@@ -559,8 +559,12 @@ nfscl_getstateid(vnode_t vp, u_int8_t *n
NFSUNLOCKCLSTATE();
return (ENOENT);
}
- /* for read aheads or write behinds, use the open cred */
- newnfs_copycred(&op->nfso_cred, cred);
+ /*
+ * For read aheads or write behinds, use the open cred.
+ * A read ahead or write behind is indicated by p == NULL.
+ */
+ if (p == NULL)
+ newnfs_copycred(&op->nfso_cred, cred);
}
/*
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