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[82.135.80.228]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5c0bb21399bsm2739670a12.50.2024.08.28.14.43.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Aug 2024 14:43:45 -0700 (PDT) From: Thorsten Blum To: chuck.lever@oracle.com, jlayton@kernel.org, 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, Thorsten Blum Subject: [PATCH] NFSD: Annotate struct pnfs_block_deviceaddr with __counted_by() Date: Wed, 28 Aug 2024 23:42:55 +0200 Message-ID: <20240828214254.2407-2-thorsten.blum@toblux.com> X-Mailer: git-send-email 2.46.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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. Use struct_size() instead of manually calculating the number of bytes to allocate for a pnfs_block_deviceaddr with a single volume. Signed-off-by: Thorsten Blum Acked-by: Jeff Layton Reviewed-by: Gustavo A. R. Silva --- fs/nfsd/blocklayout.c | 6 ++---- fs/nfsd/blocklayoutxdr.h | 2 +- 2 files changed, 3 insertions(+), 5 deletions(-) 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, --=20 2.46.0