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arm64: cpufeature: add pointer auth meta-capabilities

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To enable pointer auth for the kernel, we're going to need to check for
the presence of address auth and generic auth using alternative_if. We
currently have two cpucaps for each, but alternative_if needs to check a
single cpucap. So define meta-capabilities that are present when either
of the current two capabilities is present.

Leave the existing four cpucaps in place, as they are still needed to
check for mismatched systems where one CPU has the architected algorithm
but another has the IMP DEF algorithm.

Note, the meta-capabilities were present before but were removed in
commit a56005d321 ("arm64: cpufeature: Reduce number of pointer auth
CPU caps from 6 to 4") and commit 1e013d0612 ("arm64: cpufeature: Rework
ptr auth hwcaps using multi_entry_cap_matches"), as they were not needed
then. Note, unlike before, the current patch checks the cpucap values
directly, instead of reading the CPU ID register value.

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Vincenzo Frascino <Vincenzo.Frascino@arm.com>
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
[Amit: commit message and macro rebase, use __system_matches_cap]
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Kristina Martsenko 2020-03-13 14:34:49 +05:30 committed by Catalin Marinas
parent 3ff047f697
commit cfef06bd06
3 changed files with 29 additions and 6 deletions
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4
arch/arm64/include/asm/cpucaps.h
View File

@ -58,7 +58,9 @@
#define ARM64_WORKAROUND_SPECULATIVE_AT_NVHE 48
#define ARM64_HAS_E0PD 49
#define ARM64_HAS_RNG 50
#define ARM64_HAS_ADDRESS_AUTH 51
#define ARM64_HAS_GENERIC_AUTH 52
#define ARM64_NCAPS 51
#define ARM64_NCAPS 53
#endif /* __ASM_CPUCAPS_H */

6
arch/arm64/include/asm/cpufeature.h
View File

@ -590,15 +590,13 @@ static inline bool system_supports_cnp(void)
static inline bool system_supports_address_auth(void)
{
return IS_ENABLED(CONFIG_ARM64_PTR_AUTH) &&
(cpus_have_const_cap(ARM64_HAS_ADDRESS_AUTH_ARCH) ||
cpus_have_const_cap(ARM64_HAS_ADDRESS_AUTH_IMP_DEF));
cpus_have_const_cap(ARM64_HAS_ADDRESS_AUTH);
}
static inline bool system_supports_generic_auth(void)
{
return IS_ENABLED(CONFIG_ARM64_PTR_AUTH) &&
(cpus_have_const_cap(ARM64_HAS_GENERIC_AUTH_ARCH) ||
cpus_have_const_cap(ARM64_HAS_GENERIC_AUTH_IMP_DEF));
cpus_have_const_cap(ARM64_HAS_GENERIC_AUTH);
}
static inline bool system_uses_irq_prio_masking(void)

25
arch/arm64/kernel/cpufeature.c
View File

@ -1323,6 +1323,20 @@ static void cpu_enable_address_auth(struct arm64_cpu_capabilities const *cap)
sysreg_clear_set(sctlr_el1, 0, SCTLR_ELx_ENIA | SCTLR_ELx_ENIB |
SCTLR_ELx_ENDA | SCTLR_ELx_ENDB);
}
static bool has_address_auth(const struct arm64_cpu_capabilities *entry,
int __unused)
{
return __system_matches_cap(ARM64_HAS_ADDRESS_AUTH_ARCH) ||
__system_matches_cap(ARM64_HAS_ADDRESS_AUTH_IMP_DEF);
}
static bool has_generic_auth(const struct arm64_cpu_capabilities *entry,
int __unused)
{
return __system_matches_cap(ARM64_HAS_GENERIC_AUTH_ARCH) ||
__system_matches_cap(ARM64_HAS_GENERIC_AUTH_IMP_DEF);
}
#endif /* CONFIG_ARM64_PTR_AUTH */
#ifdef CONFIG_ARM64_E0PD
@ -1600,7 +1614,6 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.field_pos = ID_AA64ISAR1_APA_SHIFT,
.min_field_value = ID_AA64ISAR1_APA_ARCHITECTED,
.matches = has_cpuid_feature,
.cpu_enable = cpu_enable_address_auth,
},
{
.desc = "Address authentication (IMP DEF algorithm)",
@ -1611,6 +1624,11 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.field_pos = ID_AA64ISAR1_API_SHIFT,
.min_field_value = ID_AA64ISAR1_API_IMP_DEF,
.matches = has_cpuid_feature,
},
{
.capability = ARM64_HAS_ADDRESS_AUTH,
.type = ARM64_CPUCAP_SYSTEM_FEATURE,
.matches = has_address_auth,
.cpu_enable = cpu_enable_address_auth,
},
{
@ -1633,6 +1651,11 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.min_field_value = ID_AA64ISAR1_GPI_IMP_DEF,
.matches = has_cpuid_feature,
},
{
.capability = ARM64_HAS_GENERIC_AUTH,
.type = ARM64_CPUCAP_SYSTEM_FEATURE,
.matches = has_generic_auth,
},
#endif /* CONFIG_ARM64_PTR_AUTH */
#ifdef CONFIG_ARM64_PSEUDO_NMI
{