evie/android_kernel_oneplus_msm8998
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Merge "arm64: Implement branch predictor hardening for Falkor"

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Linux Build Service Account 2018-02-08 19:03:42 -08:00 • committed by Gerrit - the friendly Code Review server
commit 741767ad2c
2 changed files with 37 additions and 2 deletions
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8
arch/arm64/kernel/bpi.S
View file

@ -77,3 +77,11 @@ ENTRY(__psci_hyp_bp_inval_start)
ldp x0, x1, [sp, #(16 * 8)]
add sp, sp, #(8 * 18)
ENTRY(__psci_hyp_bp_inval_end)
ENTRY(__qcom_hyp_sanitize_link_stack_start)
stp x29, x30, [sp, #-16]!
.rept 16
bl . + 4
.endr
ldp x29, x30, [sp], #16
ENTRY(__qcom_hyp_sanitize_link_stack_end)

31
arch/arm64/kernel/cpu_errata.c
View file

@ -37,6 +37,8 @@ DEFINE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data);
#ifdef CONFIG_KVM
extern char __psci_hyp_bp_inval_start[], __psci_hyp_bp_inval_end[];
extern char __qcom_hyp_sanitize_link_stack_start[];
extern char __qcom_hyp_sanitize_link_stack_end[];
static void __copy_hyp_vect_bpi(int slot, const char *hyp_vecs_start,
const char *hyp_vecs_end)
@ -79,8 +81,10 @@ static void __install_bp_hardening_cb(bp_hardening_cb_t fn,
spin_unlock(&bp_lock);
}
#else
#define __psci_hyp_bp_inval_start NULL
#define __psci_hyp_bp_inval_end NULL
#define __psci_hyp_bp_inval_start NULL
#define __psci_hyp_bp_inval_end NULL
#define __qcom_hyp_sanitize_link_stack_start NULL
#define __qcom_hyp_sanitize_link_stack_end NULL
static void __maybe_unused __install_bp_hardening_cb(bp_hardening_cb_t fn,
const char *hyp_vecs_start,
@ -122,6 +126,29 @@ static int enable_psci_bp_hardening(void *data)
return 0;
}
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));
}
static int __maybe_unused qcom_enable_link_stack_sanitization(void *data)
{
const struct arm64_cpu_capabilities *entry = data;
install_bp_hardening_cb(entry, qcom_link_stack_sanitization,
__qcom_hyp_sanitize_link_stack_start,
__qcom_hyp_sanitize_link_stack_end);
return 0;
}
#endif /* CONFIG_HARDEN_BRANCH_PREDICTOR */
#define MIDR_RANGE(model, min, max) \