From 121388a31362b0d3176dc1190ac8064b98a61b20 Mon Sep 17 00:00:00 2001
From: Laura Abbott <lauraa@codeaurora.org>
Date: Fri, 8 Sep 2017 16:16:17 -0700
Subject: [PATCH] init: move stack canary initialization after setup_arch
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@codeaurora.org>
Signed-off-by: Laura Abbott <labbott@redhat.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Daniel Micay <danielmicay@gmail.com>
Cc: Nick Kralevich <nnk@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
init/main.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/init/main.c b/init/main.c
index 949306bb5b6ad..ae5d1fd780819 100644
--- a/init/main.c
+++ b/init/main.c
@@ -515,12 +515,6 @@ asmlinkage __visible void __init start_kernel(void)
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();
@@ -534,6 +528,11 @@ asmlinkage __visible void __init start_kernel(void)
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();
--
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