From: Pavel Roskin <proski@gnu.org>
To: The development of GRUB 2 <grub-devel@gnu.org>
Subject: Re: [PATCH]: grub: Fix handling of long printf arguments on 64-bit.
Date: Sun, 12 Apr 2009 17:33:35 -0400 [thread overview]
Message-ID: <1239572015.14481.32.camel@ct> (raw)
In-Reply-To: <49E1E2BC.3020405@gmail.com>
On Sun, 2009-04-12 at 14:46 +0200, phcoder wrote:
> - grub_itoa (tmp, c, n);
> + grub_lltoa (tmp, c, n);
Wrong. For "x" and "u" specifiers, the value is unsigned int, but n is
signed int. If we extend signed into to unsigned long long, we get a
sign extension that would be incorrect.
Suppose the argument is 0xffffffff. n would be -1. grub_lltoa() would
get (unsigned long long)-1, that is 0xffffffffffffffff.
If the type is going to be converted, we need to treat signed and
unsigned values separately.
--
Regards,
Pavel Roskin
next prev parent reply other threads:[~2009-04-12 21:33 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-11 8:08 [PATCH]: grub: Fix handling of long printf arguments on 64-bit David Miller
2009-04-11 10:19 ` Yoshinori K. Okuji
2009-04-11 11:48 ` David Miller
2009-04-11 19:10 ` phcoder
2009-04-12 3:21 ` Pavel Roskin
2009-04-12 8:07 ` David Miller
2009-04-12 12:46 ` phcoder
2009-04-12 14:19 ` Isaac Dupree
2009-04-12 21:36 ` Pavel Roskin
2009-04-12 21:33 ` Pavel Roskin [this message]
2009-04-12 21:51 ` Pavel Roskin
2009-04-12 22:19 ` phcoder
2009-04-13 5:23 ` Pavel Roskin
2009-04-15 12:46 ` phcoder
2009-04-12 6:39 ` Pavel Roskin
2009-04-12 8:05 ` David Miller
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