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 B2B52243376 for ; Wed, 19 Nov 2025 19:12:39 +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=1763579559; cv=none; b=ZYZ3clv7l8pevC3hUxplwAAbtjvKUeWlN/Np+jF1xRml5L0k7uMSfx6CuB4d3wa66BiF/2E05PxeX+oNF/EvmPM+hSBLMJij33UpKXWhLSOKwzB0bJ6tGUuHNONwPoH4dZ9lLsJcrIcvptZG9yDcT4IaGNhYEU1LldOut3p/ops= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763579559; c=relaxed/simple; bh=8r8eSl+D3lCupSYI/L/+CbJgnPtJKvLXjrghJMDR9wU=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=gsGLASrOpjWmITewwnjuwIWFghjxjgE2BeoR5XrobeZzgKuX7IfcreSXm2e6gJgOvypncJr9K5hqQ2b3ixV86Y0GX9a8rpsaMKkzksK+AhlfysLko5fO1cgieVkIjzsQmdNWcU1NWHHushl2exkndUZJGUjF1XoCP9t3OePgrVU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Vtg7bTBf; 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="Vtg7bTBf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5A5D1C4CEF5; Wed, 19 Nov 2025 19:12:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763579558; bh=8r8eSl+D3lCupSYI/L/+CbJgnPtJKvLXjrghJMDR9wU=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=Vtg7bTBfstgsvdRc88LgzZ+FJTHidh0GG018FhLfgW6YzUgHZmTGxx2b1INXO8CrW wxJMgnzgsE9TeHBgGlq4ksFS7F8QttyIsXi8PgShP70qxnciwwfz6FpNSoqqgVcOcw +VY8PW6RFSFe3HgjzadgkSBZgXmcZ5roL1bkEVwj4+Yq+nm86aXmPiM5arRYPQwxpz WMrmzMpDEkTsBon4VHCtRRq0Ydsw+VmE49VfsbHGb6R2e//X1JZZfOfTeJ0tp+f3kM /dyhohkeO8mXemC6nmX00fIVfXbBD/Mbp7cjXMpcAhu+Wh6Io2zm7LdfsTgEmeZvOK k7gr4PNrJtfZw== Message-ID: <5268ef547aff9fe27a75d7f1c9d1c574b60dd248.camel@kernel.org> Subject: Re: [PATCH v5 01/11] nfsd: rename ALLOWED_WITHOUT_FH to ALLOWED_WITHOUT_LOCAL_FH and revise use From: Jeff Layton To: NeilBrown , Chuck Lever Cc: Olga Kornievskaia , Dai Ngo , Tom Talpey , linux-nfs@vger.kernel.org Date: Wed, 19 Nov 2025 14:12:37 -0500 In-Reply-To: <20251119033204.360415-2-neilb@ownmail.net> References: <20251119033204.360415-1-neilb@ownmail.net> <20251119033204.360415-2-neilb@ownmail.net> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV 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Wed, 2025-11-19 at 14:28 +1100, NeilBrown wrote: > From: NeilBrown >=20 > nfsdv4 ops which do not have ALLOWED_WITHOUT_FH can assume that a PUTFH > has been called and may assume that current_fh->fh_dentry is non-NULL. > nfsd4_setattr(), for example, assumes fh_dentry !=3D NULL. >=20 > However the possibility of foreign filehandles (needed for v4.2 COPY) > means that there maybe a filehandle present while fh_dentry is NULL. >=20 > Sending a COMPOUND containing: > SEQUENCE > PUTFH - foreign filehandle > SETATTR - new mode > SAVEFH > COPY - with non-empty server list >=20 > to an NFS server with inter-server copy enabled will cause a NULL > pointer dereference when nfsd4_setattr() calls fh_want_write(). >=20 > Most NFSv4 ops actually want a "local" filehandle, not just any > filehandle. So this patch renames ALLOWED_WITHOUT_FH to > ALLOWED_WITHOUT_LOCAL_FH and sets it on those which don't require a local > filehandle. That is all that don't require any filehandle together with > SAVEFH, which is the only OP which needs to handle a foreign current_fh. > (COPY must handle a foreign save_fh, but all ops which access save_fh > already do any required validity tests themselves). >=20 > nfsd4_savefh() is changed to validate the filehandle itself as the > caller no longer validates it. >=20 > nfsd4_proc_compound no longer allows ops without > ALLOWED_WITHOUT_LOCAL_FH to be called with a foreign fh - current_fh > must be local and ->fh_dentry must be non-NULL. This protects > nfsd4_setattr() and any others that might use ->fh_dentry without > checking. >=20 > The > current_fh->fh_export && > test is removed from an "else if" because that condition is now only > tested when current_fh->fh_dentry is not NULL, and in that case > current_fh->fh_export is also guaranteed to not be NULL. >=20 > Fixes: b9e8638e3d9e ("NFSD: allow inter server COPY to have a STALE sourc= e server fh") > Signed-off-by: NeilBrown > --- > fs/nfsd/nfs4proc.c | 58 ++++++++++++++++++++++++++-------------------- > fs/nfsd/xdr4.h | 2 +- > 2 files changed, 34 insertions(+), 26 deletions(-) >=20 Reviewed-by: Jeff Layton