linux-kernel - [PATCH 4.9 019/101] init: move stack canary initialization after setup

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Date:   Tue, 23 Aug 2022 10:02:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Laura Abbott <lauraa@...eaurora.org>,
        Laura Abbott <labbott@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        "Theodore Tso" <tytso@....edu>,
        Daniel Micay <danielmicay@...il.com>,
        Nick Kralevich <nnk@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Hans-Christian Noren Egtvedt <hegtvedt@...co.com>
Subject: [PATCH 4.9 019/101] init: move stack canary initialization after setup_arch

From: Laura Abbott <lauraa@...eaurora.org>

commit 121388a31362b0d3176dc1190ac8064b98a61b20 upstream.

Patch series "Command line randomness", v3.

A series to add the kernel command line as a source of randomness.

This patch (of 2):

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 accommodate this.

Link: http://lkml.kernel.org/r/20170816231458.2299-2-labbott@redhat.com
Signed-off-by: Laura Abbott <lauraa@...eaurora.org>
Signed-off-by: Laura Abbott <labbott@...hat.com>
Acked-by: Kees Cook <keescook@...omium.org>
Cc: "Theodore Ts'o" <tytso@....edu>
Cc: Daniel Micay <danielmicay@...il.com>
Cc: Nick Kralevich <nnk@...gle.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Hans-Christian Noren Egtvedt <hegtvedt@...co.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 init/main.c |   11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

--- a/init/main.c
+++ b/init/main.c
@@ -487,12 +487,6 @@ asmlinkage __visible void __init start_k
 	smp_setup_processor_id();
 	debug_objects_early_init();
 
-	/*
-	 * Set up the initial canary ASAP:
-	 */
-	add_latent_entropy();
-	boot_init_stack_canary();
-
 	cgroup_init_early();
 
 	local_irq_disable();
@@ -506,6 +500,11 @@ asmlinkage __visible void __init start_k
 	page_address_init();
 	pr_notice("%s", linux_banner);
 	setup_arch(&command_line);
+	/*
+	 * Set up the the initial canary and entropy after arch
+	 */
+	add_latent_entropy();
+	boot_init_stack_canary();
 	mm_init_cpumask(&init_mm);
 	setup_command_line(command_line);
 	setup_nr_cpu_ids();