Tom Rini писал 2022-06-06 17:43:
On Thu, Jun 02, 2022 at 09:18:42PM +0300, gerbert wrote:
This patch tries to fix a CVE-2019-14196 fix
In if-condition, where NFSV2_FLAG is checked, memcpy call is
performed
to transfer a reply data of NFS_FHSIZE size. Since the data field in
struct rpc_t structure has the size of (1024 / 4) + 26 = 282, while
NFS_FHSIZE is only 32, it won't lead to out-of-bounds write
(considering
the size of data array won't change in the future).
What concerns if-condition for NFSV3_FLAG, since filefh3_length is
signed integer, it may carry negative values which may lead to memcpy
failure, so in this case we need to introduce not only boundary check
(filefh3_length > NFS3_FHSIZE), which exists, but also make sure that
filefh3_length is not negative.
Signed-off-by: gerbert <gerb...@users.noreply.github.com>
This has been addressed as:
https://patchwork.ozlabs.org/project/uboot/patch/20220518163103.372-1-zi0bl...@protonmail.com/
and more clearly:
https://source.denx.de/u-boot/u-boot/-/commit/bdbf7a05e26f3c5fd437c99e2755ffde186ddc80
recently, thanks.
That's right. But as far as I can see if-condition for NFS v2 has the
same leftover,
which was removed from v3 part. In this case I guess it can be removed.
Kind regards,
Gerbert
