linux-kernel - Re: [PATCH] lib: string_helpers: fix potential snprintf() output truncation

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Message-ID: <CAMRc=MezpJVQUaetodJbxn7VU5rLaZUFumVsmCcwgOYdLSk8-Q@mail.gmail.com>
Date: Mon, 21 Oct 2024 12:05:10 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Kees Cook <kees@...nel.org>, Andy Shevchenko <andy@...nel.org>, 
	Andrew Morton <akpm@...ux-foundation.org>, 
	James Bottomley <James.Bottomley@...senpartnership.com>, 
	Greg KH <gregkh@...uxfoundation.org>
Cc: linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, stable@...r.kernel.org
Subject: Re: [PATCH] lib: string_helpers: fix potential snprintf() output truncation

On Mon, Oct 21, 2024 at 12:04 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
>
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>
> The output of ".%03u" with the unsigned int in range [0, 4294966295] may
> get truncated if the target buffer is not 12 bytes.
>
> Fixes: 3c9f3681d0b4 ("[SCSI] lib: add generic helper to print sizes rounded to the correct SI range")
> Cc: stable@...r.kernel.org
> Reviewed-by: Andy Shevchenko <andy@...nel.org>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---
>  lib/string_helpers.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/lib/string_helpers.c b/lib/string_helpers.c
> index 4f887aa62fa0..91fa37b5c510 100644
> --- a/lib/string_helpers.c
> +++ b/lib/string_helpers.c
> @@ -57,7 +57,7 @@ int string_get_size(u64 size, u64 blk_size, const enum string_size_units units,
>         static const unsigned int rounding[] = { 500, 50, 5 };
>         int i = 0, j;
>         u32 remainder = 0, sf_cap;
> -       char tmp[8];
> +       char tmp[12];
>         const char *unit;
>
>         tmp[0] = '\0';
> --
> 2.43.0
>

Sorry for the noise but the tag should have said [RESEND PATCH].

Bart