linux-kernel - [3.1 patch] x86 vsyscall_64.c: better error message on bad pointers

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Message-ID: <20111009134725.GD4586@localhost.pp.htv.fi>
Date:	Sun, 9 Oct 2011 16:47:26 +0300
From:	Adrian Bunk <bunk@...sta.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Andrew Lutomirski <luto@....edu>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm00@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: [3.1 patch] x86 vsyscall_64.c: better error message on bad pointers

At least some UML versions run into this and need vsyscall=native
for now.

Signed-off-by: Adrian Bunk <bunk@...sta.de>
---
 arch/x86/kernel/vsyscall_64.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c
index 18ae83d..4ab7e32 100644
--- a/arch/x86/kernel/vsyscall_64.c
+++ b/arch/x86/kernel/vsyscall_64.c
@@ -206,7 +206,7 @@ bool emulate_vsyscall(struct pt_regs *regs, unsigned long address)
 		 * vsyscalls harder, generate SIGSEGV here as well.
 		 */
 		warn_bad_vsyscall(KERN_INFO, regs,
-				  "vsyscall fault (exploit attempt?)");
+				  "vsyscall fault (exploit attempt?) - if this is a legitimate program boot with vsyscall=native (read kernel-parameters.txt for the security implications)");
 		goto sigsegv;
 	}
 


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