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Message-Id: <20170814125411.22604-2-ard.biesheuvel@linaro.org>
Date: Mon, 14 Aug 2017 13:53:42 +0100
From: Ard Biesheuvel <ard.biesheuvel@...aro.org>
To: kernel-hardening@...ts.openwall.com
Cc: linux-arm-kernel@...ts.infradead.org,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Arnd Bergmann <arnd@...db.de>,
Nicolas Pitre <nico@...aro.org>,
Russell King <linux@...linux.org.uk>,
Kees Cook <keescook@...omium.org>,
Thomas Garnier <thgarnie@...gle.com>,
Marc Zyngier <marc.zyngier@....com>,
Mark Rutland <mark.rutland@....com>,
Tony Lindgren <tony@...mide.com>,
Matt Fleming <matt@...eblueprint.co.uk>,
Dave Martin <dave.martin@....com>
Subject: [PATCH 01/30] asm-generic: add .data.rel.ro sections to __ro_after_init
When running in PIC mode, the compiler will emit const structures
containing runtime relocatable quantities into .data.rel.ro.* sections,
so that the linker can be smart about placing them together in a segment
that is read-write initially, and is remapped read-only afterwards. This
is exactly what __ro_after_init aims to provide, so move these sections
together.
Cc: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
---
include/asm-generic/vmlinux.lds.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index da0be9a8d1de..d16537b0b102 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -261,7 +261,7 @@
#ifndef RO_AFTER_INIT_DATA
#define RO_AFTER_INIT_DATA \
VMLINUX_SYMBOL(__start_ro_after_init) = .; \
- *(.data..ro_after_init) \
+ *(.data..ro_after_init .data.rel.ro.*) \
VMLINUX_SYMBOL(__end_ro_after_init) = .;
#endif
--
2.11.0
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