linux-kernel - [PATCH] x86/xen: panic on bad Xen-provided memory map

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1413517692-17727-1-git-send-email-martin@martingkelly.com>
Date:	Thu, 16 Oct 2014 20:48:11 -0700
From:	Martin Kelly <martin@...tingkelly.com>
To:	david.vrabel@...rix.com, xen-devel@...ts.xenproject.org,
	x86@...nel.org, linux-kernel@...r.kernel.org
Cc:	konrad.wilk@...cle.com, boris.ostrovsky@...cle.com,
	tglx@...utronix.de, mingo@...hat.com,
	Martin Kelly <martin@...tingkelly.com>,
	Martin Kelly <martkell@...zon.com>
Subject: [PATCH] x86/xen: panic on bad Xen-provided memory map

Panic if Xen provides a memory map with 0 entries. Although this is
unlikely, it is better to catch the error at the point of seeing the map
than later on as a symptom of some other crash.

Signed-off-by: Martin Kelly <martkell@...zon.com>
---
 arch/x86/xen/setup.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index af72161..29834b3 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -595,6 +595,7 @@ char * __init xen_memory_setup(void)
 		rc = 0;
 	}
 	BUG_ON(rc);
+	BUG_ON(memmap.nr_entries == 0);
 
 	/*
 	 * Xen won't allow a 1:1 mapping to be created to UNUSABLE
-- 
2.1.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/