linux-hardening - Re: [PATCH v3][next] xfs: Replace one-element arrays with flexible-array members

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Message-ID: <96be7032-a95c-e8d2-a7f8-64b96686ea42@embeddedor.com>
Date:   Mon, 15 Mar 2021 13:31:17 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     "Darrick J. Wong" <djwong@...nel.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Dave Chinner <david@...morbit.com>, linux-xfs@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v3][next] xfs: Replace one-element arrays with
 flexible-array members



On 3/10/21 22:47, Darrick J. Wong wrote:
> On Wed, Mar 10, 2021 at 10:23:02PM -0600, Gustavo A. R. Silva wrote:
>> There is a regular need in the kernel to provide a way to declare having
>> a dynamically sized set of trailing elements in a structure. Kernel code
>> should always use “flexible array members”[1] for these cases. The older
>> style of one-element or zero-length arrays should no longer be used[2].
>>
>> Refactor the code according to the use of flexible-array members in
>> multiple structures, instead of one-element arrays. Also, make use of
>> the new struct_size() helper to properly calculate the size of multiple
>> structures that contain flexible-array members. Additionally, wrap
>> some calls to the struct_size() helper in multiple inline functions.
>>
>> Below are the results of running xfstests for groups shutdown and log
>> with the following configuration in local.config:
>>
>> export TEST_DEV=/dev/sda3
>> export TEST_DIR=/mnt/test
>> export SCRATCH_DEV=/dev/sda4
>> export SCRATCH_MNT=/mnt/scratch
>>
>> The size for both partitions /dev/sda3 and /dev/sda4 is 25GB.
> 
> Looks good to me, will toss it at my fstests cloud and see if anything
> shakes out.  Thanks for cleaning up this goofy thorn-pile!

Great. It's been fun to work on this. :p

> Reviewed-by: Darrick J. Wong <djwong@...nel.org>

Thanks!
--
Gustavo