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x86/stackprotector: Pre-initialize canary for secondary CPUs
authorBrian Gerst <brgerst@gmail.com>
Wed, 17 Jun 2020 22:56:24 +0000 (18:56 -0400)
committerBorislav Petkov <bp@suse.de>
Thu, 18 Jun 2020 11:09:17 +0000 (13:09 +0200)
commitc9a1ff316bc9b1d1806a4366d0aef6e18833ba52
treef2dae0b0a21105a645d90444b3effddc06504c94tree | snapshot
parenta5ce9f2bb665d1d2b31f139a02dbaa2dfbb62fa6commit | diff
x86/stackprotector: Pre-initialize canary for secondary CPUs

The idle tasks created for each secondary CPU already have a random stack
canary generated by fork().  Copy the canary to the percpu variable before
starting the secondary CPU which removes the need to call
boot_init_stack_canary().

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200617225624.799335-1-brgerst@gmail.com
arch/x86/include/asm/stackprotector.h diff | blob | history
arch/x86/kernel/smpboot.c diff | blob | history
arch/x86/xen/smp_pv.c diff | blob | history