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random: do not ignore early device randomness

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The add_device_randomness() function would ignore incoming bytes if the
crng wasn't ready.  This additionally makes sure to make an early enough
call to add_latent_entropy() to influence the initial stack canary,
which is especially important on non-x86 systems where it stays the same
through the life of the boot.

Link: http://lkml.kernel.org/r/20170626233038.GA48751@beast
Signed-off-by: Kees Cook <[email protected]>
Cc: "Theodore Ts'o" <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jessica Yu <[email protected]>
Cc: Steven Rostedt (VMware) <[email protected]>
Cc: Viresh Kumar <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: Prarit Bhargava <[email protected]>
Cc: Lokesh Vutla <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: AKASHI Takahiro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Kees Cook 2017-07-12 14:34:04 -07:00 • committed by Linus Torvalds
commit ee7998c50c
2 changed files with 6 additions and 0 deletions
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init/main.c
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@ -518,6 +518,7 @@ asmlinkage __visible void __init start_kernel(void)
/*
* Set up the initial canary ASAP:
*/
add_latent_entropy();
boot_init_stack_canary();
cgroup_init_early();