GNU bug report logs - #8683
printf out-of-bounds memory access

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Pádraig Brady <P <at> draigBrady.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#8683: closed (printf out-of-bounds memory access)
Date: Tue, 17 May 2011 23:58:01 +0000

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Your message dated Wed, 18 May 2011 00:55:50 +0100
with message-id <4DD30B06.8060808 <at> draigBrady.com>
and subject line Re: bug#8683: printf out-of-bounds memory access
has caused the GNU bug report #8683,
regarding printf out-of-bounds memory access
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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8683: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=8683
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From: Paul Marinescu <paul.marinescu <at> imperial.ac.uk>
To: bug-coreutils <at> gnu.org
Cc: Cristian Cadar <c.cadar <at> imperial.ac.uk>
Subject: printf out-of-bounds memory access
Date: Tue, 17 May 2011 16:31:40 +0100

In coreutils 8.12 (latest), printf can make an out-of-bounds access when 
an integer argument consists only of a single or double quote.

The printf spec mentions that an integer argument consisting of a 
single/double quote followed by a character is interpreted as the ASCII 
value of that character. However, when the quote is alone, the code in 
the STRTOX macro (printf.c:171) goes beyond the buffer associated with 
the argument.

Possible fix: report an error at printf.c:166 if ch is 0.


Paul

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From: Pádraig Brady <P <at> draigBrady.com>
Cc: 8683-done <at> debbugs.gnu.org
Subject: Re: bug#8683: printf out-of-bounds memory access
Date: Wed, 18 May 2011 00:55:50 +0100

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On 17/05/11 16:54, Pádraig Brady wrote:
> On 17/05/11 16:31, Paul Marinescu wrote:
>> In coreutils 8.12 (latest), printf can make an out-of-bounds access when
>> an integer argument consists only of a single or double quote.

I'll apply the attached fix soon.

thanks again,
Pádraig.

[printf-oob.diff (text/x-patch, attachment)]

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