linux-kernel - [RFC 01/13] x86/paravirt: Turn KASAN off for parvirt.o

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Message-Id: <bffe57f96d76a92655cb5d230d86cec195a20f6e.1452294700.git.luto@kernel.org>
Date:	Fri,  8 Jan 2016 15:15:19 -0800
From:	Andy Lutomirski <luto@...nel.org>
To:	x86@...nel.org, linux-kernel@...r.kernel.org
Cc:	Borislav Petkov <bp@...en8.de>, Brian Gerst <brgerst@...il.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andy Lutomirski <luto@...nel.org>
Subject: [RFC 01/13] x86/paravirt: Turn KASAN off for parvirt.o

Otherwise terrible things happen if some of the callbacks end up
calling into KASAN in unexpected places.

This has no obvious symptoms yet, but adding a memory reference to
native_flush_tlb_global without this blows up on KASAN kernels.

Signed-off-by: Andy Lutomirski <luto@...nel.org>
---
 arch/x86/kernel/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index b1b78ffe01d0..b7cd5bdf314b 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -19,6 +19,7 @@ endif
 KASAN_SANITIZE_head$(BITS).o := n
 KASAN_SANITIZE_dumpstack.o := n
 KASAN_SANITIZE_dumpstack_$(BITS).o := n
+KASAN_SANITIZE_paravirt.o := n
 
 CFLAGS_irq.o := -I$(src)/../include/asm/trace
 
-- 
2.5.0