Date: Sun, 5 Aug 2018 19:21:51 +0000 (UTC) From: Rick Macklem <rmacklem@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r337357 - head/sys/fs/nfsserver Message-ID: <201808051921.w75JLpvQ014548@repo.freebsd.org>
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Author: rmacklem Date: Sun Aug 5 19:21:50 2018 New Revision: 337357 URL: https://svnweb.freebsd.org/changeset/base/337357 Log: Copy all bits of a file handle in case there is padding in the structure. At least on x86, fhandle_t is a packed structure, so I believe an assignment will copy all the bits. However, for some current/future architectures, there might be padding in the structure that doesn't get copied via an assignment. Since NFS assumes a file handle is an opaque blob of bits that can be compared via memcmp()/bcmp(), all the bits including any padding must be copied. This patch replaces the assignments with a call to a byte copy function. Spotted during code inspection. Modified: head/sys/fs/nfsserver/nfs_nfsdport.c head/sys/fs/nfsserver/nfs_nfsdstate.c Modified: head/sys/fs/nfsserver/nfs_nfsdport.c ============================================================================== --- head/sys/fs/nfsserver/nfs_nfsdport.c Sun Aug 5 19:17:07 2018 (r337356) +++ head/sys/fs/nfsserver/nfs_nfsdport.c Sun Aug 5 19:21:50 2018 (r337357) @@ -3954,7 +3954,7 @@ nfsrv_pnfscreate(struct vnode *vp, struct vattr *vap, tdsc->p = p; tdsc->pf = tpf; tdsc->createva = *vap; - tdsc->fh = fh; + NFSBCOPY(&fh, &tdsc->fh, sizeof(fh)); tdsc->va = va; tdsc->dvp = dvp[i]; tdsc->done = 0; @@ -5014,7 +5014,7 @@ nfsrv_writedsrpc(fhandle_t *fhp, off_t off, int len, s error = 0; for (i = 0; i < mirrorcnt - 1; i++, tdrpc++) { tdrpc->done = 0; - tdrpc->fh = *fhp; + NFSBCOPY(fhp, &tdrpc->fh, sizeof(*fhp)); tdrpc->off = off; tdrpc->len = len; tdrpc->nmp = *nmpp; @@ -5200,7 +5200,7 @@ nfsrv_setattrdsrpc(fhandle_t *fhp, struct ucred *cred, for (i = 0; i < mirrorcnt - 1; i++, tdrpc++) { tdrpc->done = 0; tdrpc->inprog = 0; - tdrpc->fh = *fhp; + NFSBCOPY(fhp, &tdrpc->fh, sizeof(*fhp)); tdrpc->nmp = *nmpp; tdrpc->vp = vp; tdrpc->cred = cred; @@ -5348,7 +5348,7 @@ nfsrv_setacldsrpc(fhandle_t *fhp, struct ucred *cred, for (i = 0; i < mirrorcnt - 1; i++, tdrpc++) { tdrpc->done = 0; tdrpc->inprog = 0; - tdrpc->fh = *fhp; + NFSBCOPY(fhp, &tdrpc->fh, sizeof(*fhp)); tdrpc->nmp = *nmpp; tdrpc->vp = vp; tdrpc->cred = cred; Modified: head/sys/fs/nfsserver/nfs_nfsdstate.c ============================================================================== --- head/sys/fs/nfsserver/nfs_nfsdstate.c Sun Aug 5 19:17:07 2018 (r337356) +++ head/sys/fs/nfsserver/nfs_nfsdstate.c Sun Aug 5 19:21:50 2018 (r337357) @@ -6907,7 +6907,7 @@ nfsrv_recalloldlayout(NFSPROC_T *p) lyp->lay_stateid.seqid = 1; clientid = lyp->lay_clientid; stateid = lyp->lay_stateid; - fh = lyp->lay_fh; + NFSBCOPY(&lyp->lay_fh, &fh, sizeof(fh)); laytype = lyp->lay_type; break; }
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