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 AE05E165F06; Wed, 28 Aug 2024 22:09:57 +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=1724882997; cv=none; b=AaCfgY68hJvbl3XbBBdnGkDu2469UhrvcTXCV6CKOj41dMinIz32jOUGpKqX1fvLfRlD8WNOJTE4nVn4dfXDs2R4LnYTjDDGZKgBVCtJ1wBVogSXHxZHXMaJ3u698HayoGIiz5Hfguj1oWBng/Rw6LuoCoSjhcvNLapk43GxN/Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724882997; c=relaxed/simple; bh=s4NpebkhiZitrRC2NxrzlNWdDrjGVNwlsfvICCZMxi0=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=q1nVqlKu5JhdtdZfQbfnUpK8r73QA2GUwk9g4LMj/NUOZr0zSzdB9LuK9fev/LGos0h4J3V7jrlB3qBAEkfu9vuCwSzxC2BZ8bxMZi7Q8plihiZ4iIkvTV5/jXFHOs0Np/iTIANrY+9bz+4P9hu3OxtQiZsJOsNoQypoW27Um9Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mLzV1F6v; 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="mLzV1F6v" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 64860C4CEC0; Wed, 28 Aug 2024 22:09:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724882997; bh=s4NpebkhiZitrRC2NxrzlNWdDrjGVNwlsfvICCZMxi0=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=mLzV1F6vhG6qrIowvYQUkXdubmEq8iYgs4wvRxiSB+4liUVXB3Wd9nktx7VzBpPvK bWWRIkYHkKMMkcCOi36dolXv4gzvp/iIjmer7Ec9WTaYp7SB6bY1XON6JnvMWM4OvP R27WvhaDAsk47fTEiILDT9Pko085yZYxjDfQtOTWpTlj85wQ4WHLmVePfLzLCdwR3L cpvDIOEEvVSMRXmufgrxJAN0o1wO71KeRpa5PhPGXSR5Zdk5yd2mP4obBWOen4RpeH gDg7HGmhQif5kHWvxlhbVkr7ywD4dOzZRcIoey2cf9uSJWM0kos6ckjWG8uhv9ynKv KhMH6oG3KG6GQ== Message-ID: <998d25a6ac673063fe1b0def62af90792379c4fe.camel@kernel.org> Subject: Re: [PATCH] NFSD: Annotate struct pnfs_block_deviceaddr with __counted_by() From: Jeff Layton To: Thorsten Blum , chuck.lever@oracle.com, neilb@suse.de, okorniev@redhat.com, Dai.Ngo@oracle.com, tom@talpey.com, kees@kernel.org, gustavoars@kernel.org Cc: linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Date: Wed, 28 Aug 2024 18:09:54 -0400 In-Reply-To: <20240828214254.2407-2-thorsten.blum@toblux.com> References: <20240828214254.2407-2-thorsten.blum@toblux.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv 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linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2024-08-28 at 23:42 +0200, Thorsten Blum wrote: > Add the __counted_by compiler attribute to the flexible array member > volumes to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and > CONFIG_FORTIFY_SOURCE. >=20 > Use struct_size() instead of manually calculating the number of bytes to > allocate for a pnfs_block_deviceaddr with a single volume. >=20 > Signed-off-by: Thorsten Blum > --- > fs/nfsd/blocklayout.c | 6 ++---- > fs/nfsd/blocklayoutxdr.h | 2 +- > 2 files changed, 3 insertions(+), 5 deletions(-) >=20 > diff --git a/fs/nfsd/blocklayout.c b/fs/nfsd/blocklayout.c > index 3c040c81c77d..08a20e5bcf7f 100644 > --- a/fs/nfsd/blocklayout.c > +++ b/fs/nfsd/blocklayout.c > @@ -147,8 +147,7 @@ nfsd4_block_get_device_info_simple(struct super_block= *sb, > struct pnfs_block_deviceaddr *dev; > struct pnfs_block_volume *b; > =20 > - dev =3D kzalloc(sizeof(struct pnfs_block_deviceaddr) + > - sizeof(struct pnfs_block_volume), GFP_KERNEL); > + dev =3D kzalloc(struct_size(dev, volumes, 1), GFP_KERNEL); > if (!dev) > return -ENOMEM; > gdp->gd_device =3D dev; > @@ -255,8 +254,7 @@ nfsd4_block_get_device_info_scsi(struct super_block *= sb, > const struct pr_ops *ops; > int ret; > =20 > - dev =3D kzalloc(sizeof(struct pnfs_block_deviceaddr) + > - sizeof(struct pnfs_block_volume), GFP_KERNEL); > + dev =3D kzalloc(struct_size(dev, volumes, 1), GFP_KERNEL); > if (!dev) > return -ENOMEM; > gdp->gd_device =3D dev; > diff --git a/fs/nfsd/blocklayoutxdr.h b/fs/nfsd/blocklayoutxdr.h > index b0361e8aa9a7..4e28ac8f1127 100644 > --- a/fs/nfsd/blocklayoutxdr.h > +++ b/fs/nfsd/blocklayoutxdr.h > @@ -47,7 +47,7 @@ struct pnfs_block_volume { > =20 > struct pnfs_block_deviceaddr { > u32 nr_volumes; > - struct pnfs_block_volume volumes[]; > + struct pnfs_block_volume volumes[] __counted_by(nr_volumes); > }; > =20 > __be32 nfsd4_block_encode_getdeviceinfo(struct xdr_stream *xdr, Acked-by: Jeff Layton