linux-kernel - [PATCH] s390: disable postinit-readonly for now

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Message-ID: <20160310173144.GA25532@www.outflux.net>
Date:	Thu, 10 Mar 2016 09:31:44 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	kernel-hardening@...ts.openwall.com
Subject: [PATCH] s390: disable postinit-readonly for now

This is a temporary fix to let lkdtm run again on s390, though it'll
still fail the ro_after_init tests. Until rodata and ro_after_init
sections can be split on s390, disable special handling of ro_after_init.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
for -next ...
---
 arch/s390/include/asm/cache.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/s390/include/asm/cache.h b/arch/s390/include/asm/cache.h
index 4d7ccac5fd1d..22da3b34c655 100644
--- a/arch/s390/include/asm/cache.h
+++ b/arch/s390/include/asm/cache.h
@@ -15,4 +15,7 @@
 
 #define __read_mostly __attribute__((__section__(".data..read_mostly")))
 
+/* Read-only memory is marked before mark_rodata_ro() is called. */
+#define __ro_after_init __read_mostly
+
 #endif
-- 
2.6.3


-- 
Kees Cook
Chrome OS & Brillo Security