From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9D4003D4132; Tue, 15 Sep 2026 17:00:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789491617; cv=none; b=qrWabmVxZ7rh4J08XhO1M0Nr+n6sk775jdNpNaGe84Qu5VQQka5e+WJPHMCBYIRQP3fs6gqhH25cmB6rvvcq/MDF9fe/FhybgAuMD+bVdGT/8eCAWPslW2myA9N/lq6nGu6w58/m30AKOe4M5PH1DhOFM2+uuOleurMwhDApuKA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789491617; c=relaxed/simple; bh=ND4TPsn5to6GX9WFrOuYg/NU6FRMW+vuLxKhpitZcVk=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=gDql8lUppEusZ64XzypQthRWWu6XVcZpZTH9HqUuGDmNfj3eJZK61yg1Twr+s3sHFM8jl2fNnV9gFJNC7SUCmc8/VC4CNSY6483Nc97gBXCSDyDbY4yqY+igeYGRjwtqrjp1hlHBy1GnlGaKnEBYHBqseQai3Z4JQSC38xykC8k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=K0sjRC8m; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="K0sjRC8m" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CA2661F000FF; Tue, 15 Sep 2026 17:00:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789491615; bh=OJy/moElISwcHs9NFz/NegMQ+wBBdpqmWZ4d/i1Zlf8=; h=Subject:From:To:Cc:Date:In-Reply-To:References; b=K0sjRC8mjaFeoqcx8+r6ruIACZHuz1pKe3XSD4K6drtE3e6rGSu4qME0x0ZWSQgM4 qBARn0MVofsMF7EnpIjgm3Mb1hTw0pLDAP/jKCvQf4tTG1hTVEw5PtMkB1siJF18zb 7X3vFLwuKUg66NlZnbl4zkOLbMp263FRVrCncmmnm0IrCmDuBx5qEKhIEpLNIMavhH vxRsHk1WfsC/0+p3FgnSJF1VRNd233DBZpnUDKeLYRf75/POt1Dn9Aghiqr55siQAv deIBbk293zKePHZVEiVh0T6vkO3UOz0LRu91ZwDN1Pz9UITinB4ge/Oc8sI/QiSmZm KpLA89JOqMqnA== Message-ID: <72840580fc360ac06e9c4455d6ba3d3c4685d7a0.camel@kernel.org> Subject: Re: [PATCH] NFSD: copy SETXATTR data from all XDR buffer segments From: Jeff Layton To: Aldo Ariel Panzardo , Chuck Lever Cc: linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Date: Tue, 15 Sep 2026 13:00:13 -0400 In-Reply-To: <20260915160022.3105295-1-qwe.aldo@gmail.com> References: <20260915160022.3105295-1-qwe.aldo@gmail.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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nfsd4_vbuf_from_vector() manually copies the head followed by whole > pages starting at offset zero. This assumes that all remaining data > starts at the beginning of the page array and that no data is stored > in the tail. >=20 > However, nfsd4_decode_setxattr() passes an xdr_buf returned by > xdr_stream_subsegment(). Such a sub-buffer can have a nonzero > page_base and can span its page and tail segments. Ignoring that > layout can copy the wrong bytes into the value passed to > vfs_setxattr(). >=20 > Use read_bytes_from_xdr_buf(), which observes the complete xdr_buf > layout. >=20 > Fixes: c1346a1216ab ("NFSD: Replace the internals of the READ_BUF() macro= ") > Cc: stable@vger.kernel.org > Signed-off-by: Aldo Ariel Panzardo > --- > fs/nfsd/nfs4xdr.c | 19 +++---------------- > 1 file changed, 3 insertions(+), 16 deletions(-) >=20 > diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c > index e17488a911..0f9f926cbd 100644 > --- a/fs/nfsd/nfs4xdr.c > +++ b/fs/nfsd/nfs4xdr.c > @@ -2288,10 +2288,8 @@ static __be32 > nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct xdr_buf *= xdr, > char **bufp, size_t buflen) > { > - struct page **pages =3D xdr->pages; > struct kvec *head =3D xdr->head; > - char *tmp, *dp; > - u32 len; > + char *tmp; > =20 > if (buflen <=3D head->iov_len) { > /* > @@ -2306,19 +2304,8 @@ nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *= argp, struct xdr_buf *xdr, > if (tmp =3D=3D NULL) > return nfserr_jukebox; > =20 > - dp =3D tmp; > - memcpy(dp, head->iov_base, head->iov_len); > - buflen -=3D head->iov_len; > - dp +=3D head->iov_len; > - > - while (buflen > 0) { > - len =3D min_t(u32, buflen, PAGE_SIZE); > - memcpy(dp, page_address(*pages), len); > - > - buflen -=3D len; > - dp +=3D len; > - pages++; > - } > + if (read_bytes_from_xdr_buf(xdr, 0, tmp, buflen)) > + return nfserr_bad_xdr; > =20 > *bufp =3D tmp; > return 0; Reviewed-by: Jeff Layton