Add a flag to detect Apple T2 chips on Intel Macs. Cache the result to avoid repeated checks. That will be used in upcoming patches.
Signed-off-by: Atharva Tiwari <[email protected]> --- arch/x86/kernel/quirks.c | 37 ++++++++++++++++++ include/linux/platform_data/x86/apple.h | 5 +++ .../platform_certs/keyring_handler.h | 8 ---- security/integrity/platform_certs/load_uefi.c | 38 ++++--------------- 4 files changed, 50 insertions(+), 38 deletions(-) diff --git a/arch/x86/kernel/quirks.c b/arch/x86/kernel/quirks.c index a92f18db9610..6651e5d4d106 100644 --- a/arch/x86/kernel/quirks.c +++ b/arch/x86/kernel/quirks.c @@ -664,8 +664,45 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x2083, quirk_intel_purley_xeon_ras bool x86_apple_machine; EXPORT_SYMBOL(x86_apple_machine); +bool has_apple_t2_chip; +EXPORT_SYMBOL(has_apple_t2_chip); + +static const char * const __initconst apple_t2_models[] = { + "MacBookPro15,1", + "MacBookPro15,2", + "MacBookPro15,3", + "MacBookPro15,4", + "MacBookPro16,1", + "MacBookPro16,2", + "MacBookPro16,3", + "MacBookPro16,4", + "MacBookAir8,1", + "MacBookAir8,2", + "MacBookAir9,1", + "Macmini8,1", + "MacPro7,1", + "iMac20,1", + "iMac20,2", + "iMacPro1,1", +}; + void __init early_platform_quirks(void) { x86_apple_machine = dmi_match(DMI_SYS_VENDOR, "Apple Inc.") || dmi_match(DMI_SYS_VENDOR, "Apple Computer, Inc."); + + if (x86_apple_machine) { + const char *product_name = dmi_get_system_info(DMI_PRODUCT_NAME); + int i; + + if (!product_name) + return; + + for (i = 0; i < ARRAY_SIZE(apple_t2_models); i++) { + if (!strcmp(product_name, apple_t2_models[i])) { + has_apple_t2_chip = true; + break; + } + } + } } diff --git a/include/linux/platform_data/x86/apple.h b/include/linux/platform_data/x86/apple.h index 079e816c3c21..47b27dceab18 100644 --- a/include/linux/platform_data/x86/apple.h +++ b/include/linux/platform_data/x86/apple.h @@ -6,8 +6,13 @@ * x86_apple_machine - whether the machine is an x86 Apple Macintosh */ extern bool x86_apple_machine; +/** + * has_apple_t2_chip - whether the machine has the Apple T2 chip + */ +extern bool has_apple_t2_chip; #else #define x86_apple_machine false +#define has_apple_t2_chip false #endif #endif diff --git a/security/integrity/platform_certs/keyring_handler.h b/security/integrity/platform_certs/keyring_handler.h index f92895cc50f6..a355f4400179 100644 --- a/security/integrity/platform_certs/keyring_handler.h +++ b/security/integrity/platform_certs/keyring_handler.h @@ -45,11 +45,3 @@ efi_element_handler_t get_handler_for_code_signing_keys(const efi_guid_t *sig_ty efi_element_handler_t get_handler_for_dbx(const efi_guid_t *sig_type); #endif - -#ifndef UEFI_QUIRK_SKIP_CERT -#define UEFI_QUIRK_SKIP_CERT(vendor, product) \ - .matches = { \ - DMI_MATCH(DMI_BOARD_VENDOR, vendor), \ - DMI_MATCH(DMI_PRODUCT_NAME, product), \ - }, -#endif diff --git a/security/integrity/platform_certs/load_uefi.c b/security/integrity/platform_certs/load_uefi.c index c0d6948446c3..b4096d4c828d 100644 --- a/security/integrity/platform_certs/load_uefi.c +++ b/security/integrity/platform_certs/load_uefi.c @@ -3,42 +3,16 @@ #include <linux/kernel.h> #include <linux/sched.h> #include <linux/cred.h> -#include <linux/dmi.h> #include <linux/err.h> #include <linux/efi.h> #include <linux/slab.h> #include <linux/ima.h> +#include <linux/platform_data/x86/apple.h> #include <keys/asymmetric-type.h> #include <keys/system_keyring.h> #include "../integrity.h" #include "keyring_handler.h" -/* - * On T2 Macs reading the db and dbx efi variables to load UEFI Secure Boot - * certificates causes occurrence of a page fault in Apple's firmware and - * a crash disabling EFI runtime services. The following quirk skips reading - * these variables. - */ -static const struct dmi_system_id uefi_skip_cert[] = { - { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro15,1") }, - { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro15,2") }, - { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro15,3") }, - { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro15,4") }, - { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro16,1") }, - { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro16,2") }, - { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro16,3") }, - { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro16,4") }, - { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookAir8,1") }, - { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookAir8,2") }, - { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookAir9,1") }, - { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "Macmini8,1") }, - { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacPro7,1") }, - { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "iMac20,1") }, - { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "iMac20,2") }, - { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "iMacPro1,1") }, - { } -}; - /* * Look to see if a UEFI variable called MokIgnoreDB exists and return true if * it does. @@ -165,10 +139,14 @@ static int __init load_uefi_certs(void) unsigned long dbsize = 0, dbxsize = 0, mokxsize = 0; efi_status_t status; int rc = 0; - const struct dmi_system_id *dmi_id; - dmi_id = dmi_first_match(uefi_skip_cert); - if (dmi_id) { + /* + * On T2 Macs reading the db and dbx efi variables to load UEFI Secure Boot + * certificates causes occurrence of a page fault in Apple's firmware and + * a crash disabling EFI runtime services. The following quirk skips reading + * these variables. + */ + if (has_apple_t2_chip) { pr_err("Reading UEFI Secure Boot Certs is not supported on T2 Macs.\n"); return false; } -- 2.43.0
