From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f199.google.com (mail-pg1-f199.google.com [209.85.215.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 667B04ACC74 for ; Tue, 6 Oct 2026 23:33:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791329592; cv=none; b=Q+Rey7WrkDDZ1GEoz/7nM0qy+sWd6siwk3m/UFs1v97XYiZS0D9Aa5Ypw+d+3s+SABdri4U3pwuz6abp0a/bZyx1efG/qBdEIN+FEOuOaP9TsYozSQS3wSSHEW238Olx6Ww8VDgFYqpwIKBAjt2T0WUduA+0l8M1X0iSGZwTAt8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791329592; c=relaxed/simple; bh=jeh8wX1VtM8rIztS1mGHGilDl1cowvi7CkMOJho//9g=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=tOkf/UTU5GEkNIByTEaAN+0AzNgtDTjYiiFjb09O/GMLmlMAfU88fLKs8Uuy5NKLJU77neN9Mi/x2KgdgHPM+fjhfDjCe7ZySn2tEkCAg0NxFtfUpuvBm9wgqKd2PcTUPaPOrzvlSP7rcUouhc8jQsIsot2wCSybAnjv66Vw4mU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--praan.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=VdtbWuDA; arc=none smtp.client-ip=209.85.215.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--praan.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="VdtbWuDA" Received: by mail-pg1-f199.google.com with SMTP id 41be03b00d2f7-cc7e92f36f9so2894835a12.3 for ; Tue, 06 Oct 2026 16:33:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1791329591; x=1791934391; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=6upXy1ggiAmqRn8NzAPWCi+VBffm0mcFL33X4iCEF+M=; b=VdtbWuDAr0QAZhJjWAvENo+r7eEE8Ko6rX13d+fSRMAzhMMefhMEXPc84N5s6QKL0C 31/WefkyE6rp3yOAuqdkfD2Ai7dn35WWNG6368TjLwCIyo4wXlYmNhOgdyDfft5PrZri 5XkeRCxBBB0ITKgUTrAZfLrsvySbZCC8L/nxuxRofO6PuiQr8fPk7338ByD8/h1pJsxH NHfXKnFOzez0sWHNwq7DugNkewjR7MgITCSDiSqYv9+1dna+k+M+VjtQB6eaWVmUzlPe /oXNhTMM03yRf73tweBF43zXkOMAXTlXuBM0USED7oIQYDCLfHBDGvIBnN4vpFbT7DEC 6FYg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1791329591; x=1791934391; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=6upXy1ggiAmqRn8NzAPWCi+VBffm0mcFL33X4iCEF+M=; b=JfmMPcOjilD0PVsDyPp38Na4taz2GUx1Kgji6zXMMR+IkHyOFZ+1xRSMDwTXqQ5K5q 8J2dWD/tYJMcIwBfF+5IM6NRQ8U5oC2FtLm2I3OMV42crXMfnxGqn2fsMQUVhrGq9NRp ozBVaP9EFLPNIaxi3HZr+O7M0bfmpGuq4PBwmkTO05fX4v8UAFAnb3IdzLJGlR1mZC7d wkuTTzvBRVl/1KVpN3z9hxq/ZTwbqLsuEOW3LkbbGVJRHs5iOS6qkvzZV3prOmQAKQIr EWA7jmY+Equ3Z72V0ZzmOBVtPM5p+RvmkB46zRzQ0vcQ6zFIngTy3aqk8gt8fRSl7a5K tCKQ== X-Forwarded-Encrypted: i=1; AKwUvBzDScfEC50jvrsqSfUz+7Ep/lbNdn46JLXbvFIVlPvySTmV3r4joTKS3hCOnJ/WmSqEoP+IrtYJ2GGLtTU=@vger.kernel.org X-Gm-Message-State: AFuF++kcVnMNThhMfkicasf5dwGCrOjLsL9uq9J6iHwcRLNA/pudoEmf uFC9N41mUfTsIiphOSWWxbtM7Uahke9vmQoQlImPOx4GBLoprLov6fwi+zXnL+0QwVkAGOavpM1 e4Q== X-Received: from pgej2.prod.google.com ([2002:a05:6a02:5402:b0:cc7:d4f0:846d]) (user=praan job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:6012:b0:3e0:f4a9:3615 with SMTP id adf61e73a8af0-3e1341549e5mr399754637.54.1791329590656; Tue, 06 Oct 2026 16:33:10 -0700 (PDT) Date: Tue, 6 Oct 2026 23:32:46 +0000 In-Reply-To: <20261006233248.705086-1-praan@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20261006233248.705086-1-praan@google.com> X-Mailer: git-send-email 2.56.0.rc1.315.gc6ed9934b7-goog Message-ID: <20261006233248.705086-7-praan@google.com> Subject: [RFC PATCH v1 6/8] nfs: refuse P2PDMA pages with krb5i and krb5p From: Pranjal Shrivastava To: linux-nfs@vger.kernel.org, Trond Myklebust , Anna Schumaker Cc: Chuck Lever , Jeff Layton , linux-kernel@vger.kernel.org, Christoph Hellwig , Logan Gunthorpe , Jason Gunthorpe , linux-pci@vger.kernel.org, linux-rdma@vger.kernel.org, Shivaji Kant , Tom Talpey , Leon Romanovsky , Unnati Sachan , Pranjal Shrivastava Content-Type: text/plain; charset="UTF-8" krb5i checksums and krb5p encrypts the payload via CPU accesses while the RPC is encoded, before the transport can refuse it. Fail such READs and WRITEs with -EREMOTEIO in nfs_pgio_prepare(), before encoding. Check the task's RPC client, which for a WRITE may be the krb5i client that SP4_MACH_CRED swaps in. Signed-off-by: Pranjal Shrivastava --- fs/nfs/pagelist.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c index 3ec4e1e5fe1f..ec535ed3051d 100644 --- a/fs/nfs/pagelist.c +++ b/fs/nfs/pagelist.c @@ -771,6 +771,14 @@ static void nfs_pgio_prepare(struct rpc_task *task, void *calldata) { struct nfs_pgio_header *hdr = calldata; int err; + + /* P2PDMA payloads move only by DMA */ + if (hdr->args.p2pdma && + test_bit(RPCAUTH_AUTH_DATATOUCH, + &task->tk_client->cl_auth->au_flags)) { + rpc_exit(task, -EREMOTEIO); + return; + } err = NFS_PROTO(hdr->inode)->pgio_rpc_prepare(task, hdr); if (err) rpc_exit(task, err); -- 2.56.0.rc1.315.gc6ed9934b7-goog