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ec82b567a7
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. 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> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
88 lines
2.1 KiB
ArmAsm
88 lines
2.1 KiB
ArmAsm
/*
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* Contains CPU specific branch predictor invalidation sequences
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*
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* Copyright (C) 2018 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/linkage.h>
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.macro ventry target
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.rept 31
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nop
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.endr
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b \target
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.endm
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.macro vectors target
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ventry \target + 0x000
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ventry \target + 0x080
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ventry \target + 0x100
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ventry \target + 0x180
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ventry \target + 0x200
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ventry \target + 0x280
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ventry \target + 0x300
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ventry \target + 0x380
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ventry \target + 0x400
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ventry \target + 0x480
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ventry \target + 0x500
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ventry \target + 0x580
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ventry \target + 0x600
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ventry \target + 0x680
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ventry \target + 0x700
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ventry \target + 0x780
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.endm
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.align 11
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ENTRY(__bp_harden_hyp_vecs_start)
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.rept 4
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vectors __kvm_hyp_vector
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.endr
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ENTRY(__bp_harden_hyp_vecs_end)
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ENTRY(__psci_hyp_bp_inval_start)
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sub sp, sp, #(8 * 18)
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stp x16, x17, [sp, #(16 * 0)]
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stp x14, x15, [sp, #(16 * 1)]
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stp x12, x13, [sp, #(16 * 2)]
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stp x10, x11, [sp, #(16 * 3)]
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stp x8, x9, [sp, #(16 * 4)]
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stp x6, x7, [sp, #(16 * 5)]
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stp x4, x5, [sp, #(16 * 6)]
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stp x2, x3, [sp, #(16 * 7)]
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stp x0, x1, [sp, #(16 * 8)]
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mov x0, #0x84000000
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smc #0
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ldp x16, x17, [sp, #(16 * 0)]
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ldp x14, x15, [sp, #(16 * 1)]
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ldp x12, x13, [sp, #(16 * 2)]
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ldp x10, x11, [sp, #(16 * 3)]
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ldp x8, x9, [sp, #(16 * 4)]
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ldp x6, x7, [sp, #(16 * 5)]
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ldp x4, x5, [sp, #(16 * 6)]
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ldp x2, x3, [sp, #(16 * 7)]
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ldp x0, x1, [sp, #(16 * 8)]
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add sp, sp, #(8 * 18)
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ENTRY(__psci_hyp_bp_inval_end)
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ENTRY(__qcom_hyp_sanitize_link_stack_start)
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stp x29, x30, [sp, #-16]!
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.rept 16
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bl . + 4
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.endr
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ldp x29, x30, [sp], #16
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ENTRY(__qcom_hyp_sanitize_link_stack_end)
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