linux-kernel - Re: [PATCH] ACPICA: Fix sprintf() INT

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Message-ID: <f47aee52-b826-9f84-3731-ca829064e70e@linuxfoundation.org>
Date:   Wed, 16 Nov 2022 12:53:14 -0700
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     robert.moore@...el.com, rafael.j.wysocki@...el.com,
        lenb@...nel.org, linux-acpi@...r.kernel.org, devel@...ica.org,
        linux-kernel@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH] ACPICA: Fix sprintf() INT_MAX -Wformat-truncation= warn

On 11/16/22 12:05, Rafael J. Wysocki wrote:
> On Wed, Nov 16, 2022 at 4:23 PM Shuah Khan <skhan@...uxfoundation.org> wrote:
>>
>> utprint module is included in tools/acpidump and when acpidump is built,
>> the following warning occurs.
>>
>>   CC       tools/acpidump/utprint.o
>> /usr/include/x86_64-linux-gnu/bits/stdio2.h: In function ‘sprintf’:
>> ../../../../../drivers/acpi/acpica/utprint.c:602:18: warning: specified bound 4294901760 exceeds ‘INT_MAX’ [-Wformat-truncation=]
>>    602 |         length = vsnprintf(string, ACPI_UINT32_MAX-ACPI_UINT16_MAX,
>>        |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>    603 |                         format, args);
>>        |                         ~~~~~~~~~~~~~
>>
>> Fix sprintf() to use ACPI_UINT32_MAX/2 to get rid of the truncate problem.
>> This change is inline other sprintf() implementations.
>>
>> If using ACPI_UINT32_MAX is necessary in the kernel, acpidump might require
>> special case to get rid of this truncate problem.
> 
> As ACPICA material, this should be submitted to the upstream project
> on GitHub and honestly I'm not sure if it is going to be resolved this
> way there.

Thank you for your review. I will send this ACPICA upstream project.

thanks,
-- Shuah