linux-kernel - Re: [PATCH] x86, efi: initial the local variable of DataSize to zero

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <517E43AE.6050203@console-pimps.org>
Date:	Mon, 29 Apr 2013 10:55:58 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	"Lee, Chun-Yi" <joeyli.kernel@...il.com>
CC:	matt.fleming@...el.com, mjg59@...f.ucam.org,
	linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Lee, Chun-Yi" <jlee@...e.com>, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86, efi: initial the local variable of DataSize to zero

On 26/04/13 18:19, Lee, Chun-Yi wrote:
> That will be better initial the value of DataSize to zero for the input of
> GetVariable(), otherwise we will feed a random value. The debug log of input
> DataSize like this:
> 
> ...
> [  195.915612] EFI Variables Facility v0.08 2004-May-17
> [  195.915819] efi: size: 18446744071581821342
> [  195.915969] efi:  size': 18446744071581821342
> [  195.916324] efi: size: 18446612150714306560
> [  195.916632] efi:  size': 18446612150714306560
> [  195.917159] efi: size: 18446612150714306560
> [  195.917453] efi:  size': 18446612150714306560
> ...
> 
> Found on Acer Aspire V3 BIOS, it will not return the size of data if we input a
> non-zero DataSize.
> 
> Cc: Matthew Garrett <mjg@...hat.com>
> Cc: Matt Fleming <matt.fleming@...el.com>
> Cc: H. Peter Anvin <hpa@...or.com>
> Signed-off-by: Lee, Chun-Yi <jlee@...e.com>
> ---
>  arch/x86/platform/efi/efi.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
> index e4a86a6..cb59732 100644
> --- a/arch/x86/platform/efi/efi.c
> +++ b/arch/x86/platform/efi/efi.c
> @@ -204,7 +204,7 @@ static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
>  	}
>  
>  	if (boot_used_size && !finished) {
> -		unsigned long size;
> +		unsigned long size = 0;
>  		u32 attr;
>  		efi_status_t s;
>  		void *tmp;
> 

Looks good to me. Matthew?

-- 
Matt Fleming, Intel Open Source Technology Center
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/