On Fri, Feb 01, 2013 at 06:57:22PM +0000, Al Viro wrote:
> On Fri, Feb 01, 2013 at 08:15:37AM -0500, J. Bruce Fields wrote:
> > From: "J. Bruce Fields" <bfields@xxxxxxxxxx>
> >
> > We're currently ignoring errors from vfs_getattr.
> >
> > The correct thing to do is to do the stat in the main service procedure
> > not in the response encoding.
>
> FWIW, I'd combine that with parts of commit I've got in my tree; I think
> nfsd_getattr() in your variant isn't the best API here. All callers
> that want nfserrno want vfsmount/dentry coming from some fhandle. Diff
> below is introducing such helper and switching to its use (warning: edited
> patch; only obvious editing done there, but still). It does *not* address
> the issue your patch deals with (see /* BUG */ in there), but I really
> think it's a better interface than your variant.
Actually, we have precisely the same interface except for the name:
__be32 fh_getattr(struct svc_fh *fh, struct kstat *stat)
vs.
__be32 nfsd_getattr(struct svc_fh *fh, struct kstat *stat)
but I'm fine with your name.
Do you want to take these patches, or should I?
Assuming the latter: this is a version of my bugfix rebased on top of
what you just sent me. I did a quick test and verified it doesn't crash
when I asked for an acl....
--b.
commit 7afea2b2cd951c3a566356206d84a0f5b8aa0e1a
Author: J. Bruce Fields <bfields@xxxxxxxxxx>
Date: Wed Jan 30 16:10:19 2013 -0500
nfsd: handle vfs_getattr errors in acl protocol
We're currently ignoring errors from vfs_getattr.
The correct thing to do is to do the stat in the main service procedure
not in the response encoding.
Reported-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
diff --git a/fs/nfsd/nfs2acl.c b/fs/nfsd/nfs2acl.c
index 9170861..95d76dc 100644
--- a/fs/nfsd/nfs2acl.c
+++ b/fs/nfsd/nfs2acl.c
@@ -45,6 +45,10 @@ static __be32 nfsacld_proc_getacl(struct svc_rqst * rqstp,
RETURN_STATUS(nfserr_inval);
resp->mask = argp->mask;
+ nfserr = fh_getattr(fh, &resp->stat);
+ if (nfserr)
+ goto fail;
+
if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
if (IS_ERR(acl)) {
@@ -115,6 +119,9 @@ static __be32 nfsacld_proc_setacl(struct svc_rqst * rqstp,
nfserr = nfserrno( nfsd_set_posix_acl(
fh, ACL_TYPE_DEFAULT, argp->acl_default) );
}
+ if (!nfserr) {
+ nfserr = fh_getattr(fh, &resp->stat);
+ }
/* argp->acl_{access,default} may have been allocated in
nfssvc_decode_setaclargs. */
@@ -129,10 +136,15 @@ static __be32 nfsacld_proc_setacl(struct svc_rqst * rqstp,
static __be32 nfsacld_proc_getattr(struct svc_rqst * rqstp,
struct nfsd_fhandle *argp, struct nfsd_attrstat *resp)
{
+ __be32 nfserr;
dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
fh_copy(&resp->fh, &argp->fh);
- return fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
+ nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
+ if (nfserr)
+ return nfserr;
+ nfserr = fh_getattr(&resp->fh, &resp->stat);
+ return nfserr;
}
/*
@@ -150,6 +162,9 @@ static __be32 nfsacld_proc_access(struct svc_rqst *rqstp, struct nfsd3_accessarg
fh_copy(&resp->fh, &argp->fh);
resp->access = argp->access;
nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
+ if (nfserr)
+ return nfserr;
+ nfserr = fh_getattr(&resp->fh, &resp->stat);
return nfserr;
}
@@ -243,7 +258,7 @@ static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
return 0;
inode = dentry->d_inode;
- p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
+ p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
*p++ = htonl(resp->mask);
if (!xdr_ressize_check(rqstp, p))
return 0;
@@ -274,7 +289,7 @@ static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p,
struct nfsd_attrstat *resp)
{
- p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
+ p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
return xdr_ressize_check(rqstp, p);
}
@@ -282,7 +297,7 @@ static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p,
static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
struct nfsd3_accessres *resp)
{
- p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
+ p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
*p++ = htonl(resp->access);
return xdr_ressize_check(rqstp, p);
}
diff --git a/fs/nfsd/nfsxdr.c b/fs/nfsd/nfsxdr.c
index bf6d3bc..96e5619 100644
--- a/fs/nfsd/nfsxdr.c
+++ b/fs/nfsd/nfsxdr.c
@@ -195,11 +195,9 @@ encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
}
/* Helper function for NFSv2 ACL code */
-__be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
+__be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, struct kstat *stat)
{
- struct kstat stat;
- fh_getattr(fhp, &stat); /* BUG */
- return encode_fattr(rqstp, p, fhp, &stat);
+ return encode_fattr(rqstp, p, fhp, stat);
}
/*
diff --git a/fs/nfsd/xdr.h b/fs/nfsd/xdr.h
index 53b1863..4f0481d 100644
--- a/fs/nfsd/xdr.h
+++ b/fs/nfsd/xdr.h
@@ -167,7 +167,7 @@ int nfssvc_encode_entry(void *, const char *name,
int nfssvc_release_fhandle(struct svc_rqst *, __be32 *, struct nfsd_fhandle *);
/* Helper functions for NFSv2 ACL code */
-__be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp);
+__be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, struct kstat *stat);
__be32 *nfs2svc_decode_fh(__be32 *p, struct svc_fh *fhp);
#endif /* LINUX_NFSD_H */
diff --git a/fs/nfsd/xdr3.h b/fs/nfsd/xdr3.h
index 7df980e..b6d5542 100644
--- a/fs/nfsd/xdr3.h
+++ b/fs/nfsd/xdr3.h
@@ -136,6 +136,7 @@ struct nfsd3_accessres {
__be32 status;
struct svc_fh fh;
__u32 access;
+ struct kstat stat;
};
struct nfsd3_readlinkres {
@@ -225,6 +226,7 @@ struct nfsd3_getaclres {
int mask;
struct posix_acl *acl_access;
struct posix_acl *acl_default;
+ struct kstat stat;
};
/* dummy type for release */
--
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