linux-ext4 - Re: [Bug 13909] md5sum on 3GB file is constantly hanging

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Message-ID: <4A8969B9.7000905@redhat.com>
Date:	Mon, 17 Aug 2009 10:31:21 -0400
From:	Ric Wheeler <rwheeler@...hat.com>
To:	bugzilla-daemon@...zilla.kernel.org
CC:	linux-ext4@...r.kernel.org
Subject: Re: [Bug 13909] md5sum on 3GB file is constantly hanging

On 08/15/2009 09:54 AM, bugzilla-daemon@...zilla.kernel.org wrote:
> http://bugzilla.kernel.org/show_bug.cgi?id=13909
>
>
>
>
>
> --- Comment #28 from Roland Kletzing<devzero@....de>   2009-08-15 13:54:43 ---
> rus,any chance to try the attached patch and confirm if it is the real fix for
> the problem ?
>
>
>
> We're now able to duplicate this bug. Not sure why it only affects ext4.
>
> ima: kernel_read parm integer overflow bugfix
>
> Reading large files>2G causes process to loop.
> (http://bugzilla.kernel.org/show_bug.cgi?id=13909)
>
> Signed-off-by: Mimi Zohar<zohar@...ibm.com>
>
> Index: security-testing-2.6/security/integrity/ima/ima_crypto.c
> ===================================================================
> --- security-testing-2.6.orig/security/integrity/ima/ima_crypto.c
> +++ security-testing-2.6/security/integrity/ima/ima_crypto.c
> @@ -47,7 +47,8 @@ int ima_calc_hash(struct file *file, cha
> struct scatterlist sg[1];
> loff_t i_size;
> char *rbuf;
> - int rc, offset = 0;
> + unsigned long offset = 0;
> + int rc;
>
> rc = init_desc(&desc);
> if (rc != 0)
>
>    

I suspect that you will need to use the official offset type to avoid 
overflow at 4GB - loff_t should be more consistent,

Ric


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