linux-kernel - [RFC/PATCH 3/3] init: Move stack canary initialization after setup

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Message-Id: <1392168805-14200-4-git-send-email-lauraa@codeaurora.org>
Date:	Tue, 11 Feb 2014 17:33:25 -0800
From:	Laura Abbott <lauraa@...eaurora.org>
To:	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>, Arnd Bergmann <arnd@...db.de>
Cc:	Laura Abbott <lauraa@...eaurora.org>, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Kumar Gala <galak@...eaurora.org>,
	Kees Cook <keescook@...omium.org>
Subject: [RFC/PATCH 3/3] init: Move stack canary initialization after setup_arch

Stack canary intialization involves getting a random number.
Getting this random number may involve accessing caches or other
architectural specific features which are not available until
after the architecture is setup. Move the stack canary initialization
later to accomodate this.

Signed-off-by: Laura Abbott <lauraa@...eaurora.org>
---
 init/main.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/init/main.c b/init/main.c
index eb03090..63d0596 100644
--- a/init/main.c
+++ b/init/main.c
@@ -489,11 +489,6 @@ asmlinkage void __init start_kernel(void)
 	smp_setup_processor_id();
 	debug_objects_early_init();
 
-	/*
-	 * Set up the the initial canary ASAP:
-	 */
-	boot_init_stack_canary();
-
 	cgroup_init_early();
 
 	local_irq_disable();
@@ -507,6 +502,10 @@ asmlinkage void __init start_kernel(void)
 	page_address_init();
 	pr_notice("%s", linux_banner);
 	setup_arch(&command_line);
+	/*
+	 * Set up the the initial canary ASAP:
+	 */
+	boot_init_stack_canary();
 	mm_init_owner(&init_mm, &init_task);
 	mm_init_cpumask(&init_mm);
 	setup_command_line(command_line);
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation

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