Commit 115d0767 authored Jan 05, 2018 by Shanker Donthineni Committed by Gerrit - the friendly Code Review server Feb 17, 2018

arm64: Implement branch predictor hardening for Falkor



Falkor is susceptible to branch predictor aliasing and can
theoretically be attacked by malicious code. This patch
implements a mitigation for these attacks, preventing any
malicious entries from affecting other victim contexts.

Change-Id: Ieb49196c23582c3174f778891ff2ab7cdc96be54
Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org>
[will: fix label name when !CONFIG_KVM and remove references to MIDR_FALKOR]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Git-commit: ec82b567a74fbdffdf418d4bb381d55f6a9096af
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux


[neeraju@codeaurora.org: resolve merge conflicts.
 Take only qcom_link_stack_sanitization() definition]
Signed-off-by: Neeraj Upadhyay <neeraju@codeaurora.org>

parent 16995f67

arch/arm64/kernel/cpu_errata.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -146,6 +146,19 @@ static void enable_psci_bp_hardening(void *data)
		__psci_hyp_bp_inval_end);

		}

		static void __maybe_unused qcom_link_stack_sanitization(void)
		{
		u64 tmp;

		asm volatile("mov %0, x30 \n"
		".rept 16 \n"
		"bl . + 4 \n"
		".endr \n"
		"mov x30, %0 \n"
		: "=&r" (tmp));
		}

		#endif /* CONFIG_HARDEN_BRANCH_PREDICTOR */

		#define MIDR_RANGE(model, min, max) \