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: I535d423c2cefaf93627267b867bf0846e502d4c1
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: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
[sramana@codeaurora.org: Use only the link stack sanitization routines,
and leave Falkor related BP hardening code]
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>
Cortex-A57, A72, A73 and A75 are susceptible to branch predictor aliasing
and can theoretically be attacked by malicious code.
This patch implements a PSCI-based mitigation for these CPUs when available.
The call into firmware will invalidate the branch predictor state, preventing
any malicious entries from affecting other victim contexts.
Change-Id: I554536e8e5cb3839e102299da8f5b944415b1880
Co-developed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Git-commit: aa6acde65e03186b5add8151e1ffe36c3c62639b
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>
Aliasing attacks against CPU branch predictors can allow the attacks 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.
Change-Id: I07fba1943dd63df8951bf68fac947666100e5559
Co-developed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Git-commit: 0f15adbb2861ce6f75ccfc5a92b19eae0ef327d0
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
[sramana@codeaurora.org: Fix merge conflicts and make it
compilable on msm-4.4]
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>
