linux-kernel - Re: [x86/KASLR] ed9f007ee6: -- System halted

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Message-ID: <20160701075032.GC10467@x1.redhat.com>
Date:	Fri, 1 Jul 2016 15:50:32 +0800
From:	Baoquan He <bhe@...hat.com>
To:	kernel test robot <xiaolong.ye@...el.com>
Cc:	Kees Cook <keescook@...omium.org>, lkp@...org, tipbuild@...or.com,
	linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	"H.J. Lu" <hjl.tools@...il.com>, "H. Peter Anvin" <hpa@...or.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Brian Gerst <brgerst@...il.com>,
	Borislav Petkov <bp@...en8.de>,
	Andy Lutomirski <luto@...nel.org>,
	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [x86/KASLR]  ed9f007ee6: -- System halted

Hi Xiaolong,

Could you please apply below patch and see if it works for you?

>From 46c2a9ecd11f61d952253e005bbd7dcbffa652fb Mon Sep 17 00:00:00 2001
From: Baoquan He <bhe@...hat.com>
Date: Fri, 1 Jul 2016 15:34:40 +0800
Subject: [PATCH] x86/KASLR: Fix code bug of finding earliest overlap

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 arch/x86/boot/compressed/kaslr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
index 304c5c3..8e1fdf7 100644
--- a/arch/x86/boot/compressed/kaslr.c
+++ b/arch/x86/boot/compressed/kaslr.c
@@ -285,6 +285,7 @@ static bool mem_avoid_overlap(struct mem_vector *img,
 		if (mem_overlaps(img, &mem_avoid[i]) &&
 		    mem_avoid[i].start < earliest) {
 			*overlap = mem_avoid[i];
+			earliest = overlap->start;
 			is_overlapping = true;
 		}
 	}
@@ -299,6 +300,7 @@ static bool mem_avoid_overlap(struct mem_vector *img,
 
 		if (mem_overlaps(img, &avoid) && (avoid.start < earliest)) {
 			*overlap = avoid;
+			earliest = overlap->start;
 			is_overlapping = true;
 		}
 
-- 
2.5.5