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| author |   Brian Gerst <brgerst@gmail.com> | 2020-06-17 18:56:24 -0400 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2020-06-18 13:09:17 +0200 |
| commit | c9a1ff316bc9b1d1806a4366d0aef6e18833ba52 (patch) | |
| tree | f2dae0b0a21105a645d90444b3effddc06504c94 /arch/x86/xen/smp_pv.c | |
| parent | x86/speculation: Merge one test in spectre_v2_user_select_mitigation() (diff) | |
| download | wireguard-linux-c9a1ff316bc9b1d1806a4366d0aef6e18833ba52.tar.xz wireguard-linux-c9a1ff316bc9b1d1806a4366d0aef6e18833ba52.zip | |
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
Diffstat (limited to 'arch/x86/xen/smp_pv.c')
| -rw-r--r-- | arch/x86/xen/smp_pv.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c index 171aff1b11f2..9ea598dcc132 100644 --- a/arch/x86/xen/smp_pv.c +++ b/arch/x86/xen/smp_pv.c @@ -92,9 +92,7 @@ static void cpu_bringup(void) asmlinkage __visible void cpu_bringup_and_idle(void) { cpu_bringup(); - boot_init_stack_canary(); cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); - prevent_tail_call_optimization(); } void xen_smp_intr_free_pv(unsigned int cpu) |