linux-kernel - Re: [PATCH] m32r: test before subtraction on unsigned relocation range

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Message-id: <swfabjiacf1.wl%takata.hirokazu@renesas.com>
Date:	Fri, 25 Apr 2008 11:36:18 +0900
From:	Hirokazu Takata <takata@...ux-m32r.org>
To:	Roel Kluin <12o3l@...cali.nl>
Cc:	takata@...ux-m32r.org, linux-m32r@...linux-m32r.org,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] m32r: test before subtraction on unsigned relocation range

From: Roel Kluin <12o3l@...cali.nl>
Subject: [PATCH] m32r: test before subtraction on unsigned relocation range
Date: Wed, 23 Apr 2008 18:34:16 +0200
>  		case R_M32R_26_PCREL_RELA:
> -	  		relocation = (relocation - (Elf32_Addr) location);
> -			if (relocation < -0x2000000 || 0x1fffffc < relocation)
> +			if (relocation + 0x20000 < (Elf32_Addr) location ||
> +					relocation >= 0x1fffc + (Elf32_Addr) location)

A slight fix is required.

The above range check is incorrect, because the R_M32R_26_PCREL_RELA is
26-bit relocation.

-- Takata
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