linux-kernel - Re: [PATCH] scripts: Fix size mismatch of kexec_purgatory

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Message-ID: <57920C3C.1060701@suse.com>
Date:	Fri, 22 Jul 2016 14:06:20 +0200
From:	Michal Marek <mmarek@...e.com>
To:	Dave Young <dyoung@...hat.com>,
	"Tautschnig, Michael" <tautschn@...zon.co.uk>
Cc:	"linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH] scripts: Fix size mismatch of kexec_purgatory_size

On 2016-07-06 10:45, Dave Young wrote:
> On 07/04/16 at 01:55pm, Tautschnig, Michael wrote:
>> bin2c is used to create a valid C file out of a binary file where two
>> symbols will be globally defined: <name> and <name>_size. <name> is
>> passed as the first parameter of the host binary.
>>
>> Building using goto-cc reported that the purgatory binary code (the only
>> current user of this utility) declares kexec_purgatory_size as 'size_t'
>> where bin2c generate <name>_size to be 'int' so in a 64-bit host where
>> sizeof(size_t) > sizeof(int) this type mismatch will always yield the
>> wrong value for big-endian architectures while for little-endian it will
>> be wrong if the object laid in memory directly after
>> kexec_purgatory_size contains non-zero value at the time of reading.
>>
>> This commit changes <name>_size to be size_t instead.
>>
>> Note:
>>
>> Another way to fix the problem is to change the type of
>> kexec_purgatory_size to be 'int' as there's this check in code:
>> (kexec_purgatory_size <= 0)
>>
>> Signed-off-by: Michael Tautschnig <tautschn@...zon.com>
>> Cc: Michal Marek <mmarek@...e.com>
>> Cc: Vivek Goyal <vgoyal@...hat.com>
[...]
> Acked-by: Dave Young <dyoung@...hat.com>

Applied to kbuild.git#kbuild.

Michal