linux-kernel - Re: Bus error on make allyesconfig, kernelbuild with HEAD

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Message-ID: <20101106162426.GA14361@merkur.ravnborg.org>
Date:	Sat, 6 Nov 2010 17:24:26 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Ben Gamari <bgamari.foss@...il.com>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	Christoph Egger <siccegge@...fau.de>,
	linux-kernel@...r.kernel.org,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	Michal Marek <mmarek@...e.cz>
Subject: Re: Bus error on make allyesconfig, kernelbuild with HEAD

On Sat, Nov 06, 2010 at 11:49:10AM -0400, Ben Gamari wrote:
> On Sat, 06 Nov 2010 11:07:48 -0400, Ben Gamari <bgamari.foss@...il.com> wrote:
> > On Fri, 30 Jul 2010 16:43:53 +0800, Américo Wang <xiyou.wangcong@...il.com> wrote:
> > > This is useful. :) Looks like parse_dep_file() accesses out of
> > > the mmap'ed memory range...
> > > 
> > Did anything ever happen with this? I seem to be experiencing similar
> > issues while cross-compiling for ARM on x86-64. All tested kernels
> > (v2.6.35 to master) fail with,

Too k a quick look.
Does the following patch fix it?

if m == p then we will stay in the while look looking for a space.
I did not audit all of the code - there may be other issues..

	Sam

diff --git a/scripts/basic/fixdep.c b/scripts/basic/fixdep.c
index ea26b23..f472ada 100644
--- a/scripts/basic/fixdep.c
+++ b/scripts/basic/fixdep.c
@@ -318,7 +318,7 @@ static void parse_dep_file(void *map, size_t len)
 		while (m < end && (*m == ' ' || *m == '\\' || *m == '\n'))
 			m++;
 		p = m;
-		while (p < end && *p != ' ') p++;
+		while (p <= end && *p != ' ') p++;
 		if (p == end) {
 			do p--; while (!isalnum(*p));
 			p++;

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