linux-kernel - Re: [PATCH 0/2] scsi: fix 2 cases of -Wfortify-source

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Date:   Mon, 28 Aug 2023 16:41:18 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Hannes Reinecke <hare@...nel.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Nathan Chancellor <nathan@...nel.org>
Cc:     Tom Rix <trix@...hat.com>, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Ard Biesheuvel <ardb@...nel.org>
Subject: Re: [PATCH 0/2] scsi: fix 2 cases of -Wfortify-source

On Mon, Aug 28, 2023 at 3:25 PM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> clang-18 has improved its support for detecting operations that will
> truncate values at runtime via -wfortify-source resulting in two new

^ -Wfortify-source

> warnings (or errors with CONFIG_WERROR=y):
>
>   drivers/scsi/myrb.c:1906:10: warning: 'snprintf' will always be
>   truncated; specified size is 32, but format string expands to at least
>   34 [-Wfortify-source]
>
>   drivers/scsi/myrs.c:1089:10: warning: 'snprintf' will always be
>   truncated; specified size is 32, but format string expands to at least
>   34 [-Wfortify-source]
>
> When we have a string literal that does not contain any format flags,
> rather than use snprintf (sometimes with a size that's too small), let's
> use sprintf.

Even better, Ard points out this could be strcpy (or one of the
variants). Will send a v2 tomorrow.

>
> This is pattern is cleaned up throughout two files.
>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---
> Nick Desaulniers (2):
>       scsi: myrb: fix -Wfortify-source
>       scsi: myrs: fix -Wfortify-source
>
>  drivers/scsi/myrb.c |  8 ++++----
>  drivers/scsi/myrs.c | 14 +++++++-------
>  2 files changed, 11 insertions(+), 11 deletions(-)
> ---
> base-commit: 2dde18cd1d8fac735875f2e4987f11817cc0bc2c
> change-id: 20230828-scsi_fortify-9f8d279bf9aa
>
> Best regards,
> --
> Nick Desaulniers <ndesaulniers@...gle.com>
>


-- 
Thanks,
~Nick Desaulniers