From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 0AE89394798 for ; Thu, 14 May 2026 17:57:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778781431; cv=none; b=BKOg3t6yvpWRP7HpgLubGWTUp1eE694ok/VJoCyhiMe5Dneb1irgSLJbt+sCPauHY+SibPXBYUFUUcvHMKOEnv8yYK0SQbAuilCey0BVG+KHto0gNmG6T9QFu9TtyMsHeZcFDU2RBcszAMlHNv4/7i4mqV5hGzGOx1Hb5uPbthw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778781431; c=relaxed/simple; bh=MH4HvbIvTt+0DwoHKNRc37LJPXRJcGGR6NABjUJco+0=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=ll0k/yXDaa5qMhm24RNgujPh/f6klK00/F7yMXFEoQQZczFIynTkjZEWuC7XMuthBO1xulsjaoNSJOmOU8xlNgmnAdcmvTB9R8fUe2TcbFf0FgYtGanKDR/gSkz8OHgfpV3Gd/SHosVuXDgvnxsbgz6JUV6jtuRy9ecN1OhDAE8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gzdTyOo1; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="gzdTyOo1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C8BA4C2BCB3; Thu, 14 May 2026 17:57:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778781430; bh=MH4HvbIvTt+0DwoHKNRc37LJPXRJcGGR6NABjUJco+0=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=gzdTyOo1zn7Woxa0qULb8EPB3OHLAJmSnrz9eI3SDVfb28/LTdwhV3JDXaiNESgmU URncqnyuEUfTJYD04hdP6C6YGYP5/jVwrsdvrS3MbmO6Ueez8En9zTBibdulxwEYLr MzGFT+BsWghHVez03uZliNuXSDbyC/6PVd3cyDT6S/oXbGqUMGKzeCyrPE4FmqQ1ic fI41CVPtxT6G3l+DKZm2xa4LNijBFKgux5fy4pEUCgV/blfDaYpAhfOMXv4CwubMkQ 3HsWpfA721mUouLuJuoJUFa6kiOJq/sJ1DTP8EqyulS4sa1RYFq50pX3y17MYEvSAt b2r/Gr+j6TW5w== Message-ID: <7a5cb8b2664adda42b35f4d42ed184d6987fe075.camel@kernel.org> Subject: Re: [PATCH 00/38] lockd: Convert NLMv3 server-side procedures to xdrgen From: Jeff Layton To: Chuck Lever , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Trond Myklebust , Anna Schumaker Cc: linux-nfs@vger.kernel.org, Chuck Lever Date: Thu, 14 May 2026 13:57:07 -0400 In-Reply-To: <86782884-747e-4796-9961-3407e9fd759f@app.fastmail.com> References: <20260512-nlm4-xdrgen-v1-0-19d99b2634b4@oracle.com> <5229a9746d723a3f830120c0b966510f75badfc2.camel@kernel.org> <86782884-747e-4796-9961-3407e9fd759f@app.fastmail.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv 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linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2026-05-14 at 13:53 -0400, Chuck Lever wrote: > On Thu, May 14, 2026, at 12:52 PM, Jeff Layton wrote: >=20 > > I got a sketchy review from Gemini that I had Claude validate that > > looks valid. You may want to add the memset() it recommends: > >=20 > > --------------8<--------------- > >=20 > > Analysis complete. The previous review (against b201ce7af2a2 > > FREE_ALL) identified the right underlying bug but attributed it to the > > wrong commit. Here's the corrected analysis: > >=20 > > Correct commit: 3de744ee4e45 =E2=80=94 "lockd: Use xdrgen XDR functio= ns for > > the NLMv4 TEST procedure" > >=20 > > The regression: nlm4svc_lookup_file() (introduced in this commit) > > copies only fh.len bytes of the file handle without zeroing the > > remainder. Combined with .pc_argzero =3D 0 removing the > > defensive memset of the argument buffer, bytes beyond fh.len in lock- > > > fh.data contain stale data from previous RPC calls. file_hash() in > > fs/lockd/svcsubs.c reads a fixed 32 bytes (NFS2_FHSIZE) > > regardless of actual handle length, so for handles shorter than 32 > > bytes the hash is non-deterministic =E2=80=94 the same file handle can = hash to > > different buckets on different calls, causing lock > > state lookup failures. >=20 > This appears to be a regression introduced by the (previous) NLMv4 > series, and does not affect the current NLMv3 xdrgen conversion. >=20 > I can post a fix for this later today. Note that memset() was > removed as part of the xdrgen conversion because it zeroes much > more memory than actually needs to be initialized. >=20 I couldn't quite tell. It almost sounded like the change in the original patch was safe, but this series removed some protections that made it safe to skip the zeroing? In any case it sounds like a real bug that we should probably fix, though it can be done in a later patch. The series itself seems mostly mechanical. You can add: Reviewed-by: Jeff Layton