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arm64: Add skeleton to harden the branch predictor against aliasing attacks

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Aliasing attacks against CPU branch predictors can allow an attacker to
redirect speculative control flow on some CPUs and potentially divulge
information from one context to another.

This patch adds initial skeleton code behind a new Kconfig option to
enable implementation-specific mitigations against these attacks for
CPUs that are affected.

Co-developed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Will Deacon
2018-01-03 11:17:58 +00:00
committed by Catalin Marinas
parent 95e3de3590
commit 0f15adbb28
11 changed files with 215 additions and 3 deletions
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7
arch/arm64/kernel/entry.S
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@@ -721,12 +721,15 @@ el0_ia:
* Instruction abort handling
*/
mrs x26, far_el1
enable_daif
enable_da_f
#ifdef CONFIG_TRACE_IRQFLAGS
bl trace_hardirqs_off
#endif
ct_user_exit
mov x0, x26
mov x1, x25
mov x2, sp
bl do_mem_abort
bl do_el0_ia_bp_hardening
b ret_to_user
el0_fpsimd_acc:
/*