diff options
Diffstat (limited to 'secure-boot-20130131.patch')
| -rw-r--r-- | secure-boot-20130131.patch | 1331 |
1 files changed, 1331 insertions, 0 deletions
diff --git a/secure-boot-20130131.patch b/secure-boot-20130131.patch new file mode 100644 index 000000000..c58f5997c --- /dev/null +++ b/secure-boot-20130131.patch @@ -0,0 +1,1331 @@ +From 6fb120959c4578023de0af1af9c887ddf6859671 Mon Sep 17 00:00:00 2001 +From: Matthew Garrett <mjg@redhat.com> +Date: Thu, 20 Sep 2012 10:40:56 -0400 +Subject: [PATCH 01/17] Secure boot: Add new capability + +Secure boot adds certain policy requirements, including that root must not +be able to do anything that could cause the kernel to execute arbitrary code. +The simplest way to handle this would seem to be to add a new capability +and gate various functionality on that. We'll then strip it from the initial +capability set if required. + +Signed-off-by: Matthew Garrett <mjg@redhat.com> +--- + include/uapi/linux/capability.h | 6 +++++- + 1 file changed, 5 insertions(+), 1 deletion(-) + +diff --git a/include/uapi/linux/capability.h b/include/uapi/linux/capability.h +index ba478fa..7109e65 100644 +--- a/include/uapi/linux/capability.h ++++ b/include/uapi/linux/capability.h +@@ -343,7 +343,11 @@ struct vfs_cap_data { + + #define CAP_BLOCK_SUSPEND 36 + +-#define CAP_LAST_CAP CAP_BLOCK_SUSPEND ++/* Allow things that trivially permit root to modify the running kernel */ ++ ++#define CAP_COMPROMISE_KERNEL 37 ++ ++#define CAP_LAST_CAP CAP_COMPROMISE_KERNEL + + #define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP) + +-- +1.8.1 + + +From 7aa8eb6a4b228db7e2920f323f1ba97063163de1 Mon Sep 17 00:00:00 2001 +From: Josh Boyer <jwboyer@redhat.com> +Date: Thu, 20 Sep 2012 10:41:05 -0400 +Subject: [PATCH 02/17] SELinux: define mapping for new Secure Boot capability + +Add the name of the new Secure Boot capability. This allows SELinux +policies to properly map CAP_COMPROMISE_KERNEL to the appropriate +capability class. + +Signed-off-by: Josh Boyer <jwboyer@redhat.com> +--- + security/selinux/include/classmap.h | 4 ++-- + 1 file changed, 2 insertions(+), 2 deletions(-) + +diff --git a/security/selinux/include/classmap.h b/security/selinux/include/classmap.h +index 14d04e6..ed99a2d 100644 +--- a/security/selinux/include/classmap.h ++++ b/security/selinux/include/classmap.h +@@ -146,8 +146,8 @@ struct security_class_mapping secclass_map[] = { + { "memprotect", { "mmap_zero", NULL } }, + { "peer", { "recv", NULL } }, + { "capability2", +- { "mac_override", "mac_admin", "syslog", "wake_alarm", "block_suspend", +- NULL } }, ++ { "mac_override", "mac_admin", "syslog", "wake_alarm", ++ "block_suspend", "compromise_kernel", NULL } }, + { "kernel_service", { "use_as_override", "create_files_as", NULL } }, + { "tun_socket", + { COMMON_SOCK_PERMS, "attach_queue", NULL } }, +-- +1.8.1 + + +From 10ed514ecac144034eba27bf9436ef111ac2ebd2 Mon Sep 17 00:00:00 2001 +From: Josh Boyer <jwboyer@redhat.com> +Date: Thu, 20 Sep 2012 10:41:02 -0400 +Subject: [PATCH 03/17] Secure boot: Add a dummy kernel parameter that will + switch on Secure Boot mode + +This forcibly drops CAP_COMPROMISE_KERNEL from both cap_permitted and cap_bset +in the init_cred struct, which everything else inherits from. This works on +any machine and can be used to develop even if the box doesn't have UEFI. + +Signed-off-by: Josh Boyer <jwboyer@redhat.com> +--- + Documentation/kernel-parameters.txt | 7 +++++++ + kernel/cred.c | 17 +++++++++++++++++ + 2 files changed, 24 insertions(+) + +diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt +index 363e348..832b39b 100644 +--- a/Documentation/kernel-parameters.txt ++++ b/Documentation/kernel-parameters.txt +@@ -2654,6 +2654,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted. + Note: increases power consumption, thus should only be + enabled if running jitter sensitive (HPC/RT) workloads. + ++ secureboot_enable= ++ [KNL] Enables an emulated UEFI Secure Boot mode. This ++ locks down various aspects of the kernel guarded by the ++ CAP_COMPROMISE_KERNEL capability. This includes things ++ like /dev/mem, IO port access, and other areas. It can ++ be used on non-UEFI machines for testing purposes. ++ + security= [SECURITY] Choose a security module to enable at boot. + If this boot parameter is not specified, only the first + security module asking for security registration will be +diff --git a/kernel/cred.c b/kernel/cred.c +index e0573a4..c3f4e3e 100644 +--- a/kernel/cred.c ++++ b/kernel/cred.c +@@ -565,6 +565,23 @@ void __init cred_init(void) + 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); + } + ++void __init secureboot_enable() ++{ ++ pr_info("Secure boot enabled\n"); ++ cap_lower((&init_cred)->cap_bset, CAP_COMPROMISE_KERNEL); ++ cap_lower((&init_cred)->cap_permitted, CAP_COMPROMISE_KERNEL); ++} ++ ++/* Dummy Secure Boot enable option to fake out UEFI SB=1 */ ++static int __init secureboot_enable_opt(char *str) ++{ ++ int sb_enable = !!simple_strtol(str, NULL, 0); ++ if (sb_enable) ++ secureboot_enable(); ++ return 1; ++} ++__setup("secureboot_enable=", secureboot_enable_opt); ++ + /** + * prepare_kernel_cred - Prepare a set of credentials for a kernel service + * @daemon: A userspace daemon to be used as a reference +-- +1.8.1 + + +From 066b811cd05432ef91473cd349d20fa856d5ab18 Mon Sep 17 00:00:00 2001 +From: Matthew Garrett <mjg@redhat.com> +Date: Thu, 20 Sep 2012 10:41:03 -0400 +Subject: [PATCH 04/17] efi: Enable secure boot lockdown automatically when + enabled in firmware + +The firmware has a set of flags that indicate whether secure boot is enabled +and enforcing. Use them to indicate whether the kernel should lock itself +down. We also indicate the machine is in secure boot mode by adding the +EFI_SECURE_BOOT bit for use with efi_enabled. + +Signed-off-by: Matthew Garrett <mjg@redhat.com> +Signed-off-by: Josh Boyer <jwboyer@redhat.com> +--- + Documentation/x86/zero-page.txt | 2 ++ + arch/x86/boot/compressed/eboot.c | 32 ++++++++++++++++++++++++++++++++ + arch/x86/include/uapi/asm/bootparam.h | 3 ++- + arch/x86/kernel/setup.c | 5 +++++ + include/linux/cred.h | 2 ++ + include/linux/efi.h | 1 + + 6 files changed, 44 insertions(+), 1 deletion(-) + +diff --git a/Documentation/x86/zero-page.txt b/Documentation/x86/zero-page.txt +index 199f453..ff651d3 100644 +--- a/Documentation/x86/zero-page.txt ++++ b/Documentation/x86/zero-page.txt +@@ -30,6 +30,8 @@ Offset Proto Name Meaning + 1E9/001 ALL eddbuf_entries Number of entries in eddbuf (below) + 1EA/001 ALL edd_mbr_sig_buf_entries Number of entries in edd_mbr_sig_buffer + (below) ++1EB/001 ALL kbd_status Numlock is enabled ++1EC/001 ALL secure_boot Kernel should enable secure boot lockdowns + 1EF/001 ALL sentinel Used to detect broken bootloaders + 290/040 ALL edd_mbr_sig_buffer EDD MBR signatures + 2D0/A00 ALL e820_map E820 memory map table +diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c +index f8fa411..96bd86b 100644 +--- a/arch/x86/boot/compressed/eboot.c ++++ b/arch/x86/boot/compressed/eboot.c +@@ -849,6 +849,36 @@ fail: + return status; + } + ++static int get_secure_boot(efi_system_table_t *_table) ++{ ++ u8 sb, setup; ++ unsigned long datasize = sizeof(sb); ++ efi_guid_t var_guid = EFI_GLOBAL_VARIABLE_GUID; ++ efi_status_t status; ++ ++ status = efi_call_phys5(sys_table->runtime->get_variable, ++ L"SecureBoot", &var_guid, NULL, &datasize, &sb); ++ ++ if (status != EFI_SUCCESS) ++ return 0; ++ ++ if (sb == 0) ++ return 0; ++ ++ ++ status = efi_call_phys5(sys_table->runtime->get_variable, ++ L"SetupMode", &var_guid, NULL, &datasize, ++ &setup); ++ ++ if (status != EFI_SUCCESS) ++ return 0; ++ ++ if (setup == 1) ++ return 0; ++ ++ return 1; ++} ++ + /* + * Because the x86 boot code expects to be passed a boot_params we + * need to create one ourselves (usually the bootloader would create +@@ -1143,6 +1173,8 @@ struct boot_params *efi_main(void *handle, efi_system_table_t *_table, + if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) + goto fail; + ++ boot_params->secure_boot = get_secure_boot(sys_table); ++ + setup_graphics(boot_params); + + setup_efi_pci(boot_params); +diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h +index c15ddaf..85d7685 100644 +--- a/arch/x86/include/uapi/asm/bootparam.h ++++ b/arch/x86/include/uapi/asm/bootparam.h +@@ -131,7 +131,8 @@ struct boot_params { + __u8 eddbuf_entries; /* 0x1e9 */ + __u8 edd_mbr_sig_buf_entries; /* 0x1ea */ + __u8 kbd_status; /* 0x1eb */ +- __u8 _pad5[3]; /* 0x1ec */ ++ __u8 secure_boot; /* 0x1ec */ ++ __u8 _pad5[2]; /* 0x1ed */ + /* + * The sentinel is set to a nonzero value (0xff) in header.S. + * +diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c +index 8b24289..5355a54 100644 +--- a/arch/x86/kernel/setup.c ++++ b/arch/x86/kernel/setup.c +@@ -1042,6 +1042,11 @@ void __init setup_arch(char **cmdline_p) + + io_delay_init(); + ++ if (boot_params.secure_boot) { ++ set_bit(EFI_SECURE_BOOT, &x86_efi_facility); ++ secureboot_enable(); ++ } ++ + /* + * Parse the ACPI tables for possible boot-time SMP configuration. + */ +diff --git a/include/linux/cred.h b/include/linux/cred.h +index 04421e8..9e69542 100644 +--- a/include/linux/cred.h ++++ b/include/linux/cred.h +@@ -156,6 +156,8 @@ extern int set_security_override_from_ctx(struct cred *, const char *); + extern int set_create_files_as(struct cred *, struct inode *); + extern void __init cred_init(void); + ++extern void secureboot_enable(void); ++ + /* + * check for validity of credentials + */ +diff --git a/include/linux/efi.h b/include/linux/efi.h +index 7a9498a..1ae16b6 100644 +--- a/include/linux/efi.h ++++ b/include/linux/efi.h +@@ -627,6 +627,7 @@ extern int __init efi_setup_pcdp_console(char *); + #define EFI_RUNTIME_SERVICES 3 /* Can we use runtime services? */ + #define EFI_MEMMAP 4 /* Can we use EFI memory map? */ + #define EFI_64BIT 5 /* Is the firmware 64-bit? */ ++#define EFI_SECURE_BOOT 6 /* Are we in Secure Boot mode? */ + + #ifdef CONFIG_EFI + # ifdef CONFIG_X86 +-- +1.8.1 + + +From 8d8349396e90630e2617c5a855682a6c87a7ae4d Mon Sep 17 00:00:00 2001 +From: Dave Howells <dhowells@redhat.com> +Date: Tue, 23 Oct 2012 09:30:54 -0400 +Subject: [PATCH 05/17] Add EFI signature data types + +Add the data types that are used for containing hashes, keys and certificates +for cryptographic verification. + +Signed-off-by: David Howells <dhowells@redhat.com> +--- + include/linux/efi.h | 20 ++++++++++++++++++++ + 1 file changed, 20 insertions(+) + +diff --git a/include/linux/efi.h b/include/linux/efi.h +index 1ae16b6..de7021d 100644 +--- a/include/linux/efi.h ++++ b/include/linux/efi.h +@@ -388,6 +388,12 @@ typedef efi_status_t efi_query_capsule_caps_t(efi_capsule_header_t **capsules, + #define EFI_FILE_SYSTEM_GUID \ + EFI_GUID( 0x964e5b22, 0x6459, 0x11d2, 0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b ) + ++#define EFI_CERT_SHA256_GUID \ ++ EFI_GUID( 0xc1c41626, 0x504c, 0x4092, 0xac, 0xa9, 0x41, 0xf9, 0x36, 0x93, 0x43, 0x28 ) ++ ++#define EFI_CERT_X509_GUID \ ++ EFI_GUID( 0xa5c059a1, 0x94e4, 0x4aa7, 0x87, 0xb5, 0xab, 0x15, 0x5c, 0x2b, 0xf0, 0x72 ) ++ + typedef struct { + efi_guid_t guid; + u64 table; +@@ -523,6 +529,20 @@ typedef struct { + + #define EFI_INVALID_TABLE_ADDR (~0UL) + ++typedef struct { ++ efi_guid_t signature_owner; ++ u8 signature_data[]; ++} efi_signature_data_t; ++ ++typedef struct { ++ efi_guid_t signature_type; ++ u32 signature_list_size; ++ u32 signature_header_size; ++ u32 signature_size; ++ u8 signature_header[]; ++ /* efi_signature_data_t signatures[][] */ ++} efi_signature_list_t; ++ + /* + * All runtime access to EFI goes through this structure: + */ +-- +1.8.1 + + +From a221d71dd4487a5ee2b337540d0258512b7c8dba Mon Sep 17 00:00:00 2001 +From: Dave Howells <dhowells@redhat.com> +Date: Tue, 23 Oct 2012 09:36:28 -0400 +Subject: [PATCH 06/17] Add an EFI signature blob parser and key loader. + +X.509 certificates are loaded into the specified keyring as asymmetric type +keys. + +Signed-off-by: David Howells <dhowells@redhat.com> +--- + crypto/asymmetric_keys/Kconfig | 8 +++ + crypto/asymmetric_keys/Makefile | 1 + + crypto/asymmetric_keys/efi_parser.c | 108 ++++++++++++++++++++++++++++++++++++ + include/linux/efi.h | 4 ++ + 4 files changed, 121 insertions(+) + create mode 100644 crypto/asymmetric_keys/efi_parser.c + +diff --git a/crypto/asymmetric_keys/Kconfig b/crypto/asymmetric_keys/Kconfig +index 6d2c2ea..ace9c30 100644 +--- a/crypto/asymmetric_keys/Kconfig ++++ b/crypto/asymmetric_keys/Kconfig +@@ -35,4 +35,12 @@ config X509_CERTIFICATE_PARSER + data and provides the ability to instantiate a crypto key from a + public key packet found inside the certificate. + ++config EFI_SIGNATURE_LIST_PARSER ++ bool "EFI signature list parser" ++ depends on EFI ++ select X509_CERTIFICATE_PARSER ++ help ++ This option provides support for parsing EFI signature lists for ++ X.509 certificates and turning them into keys. ++ + endif # ASYMMETRIC_KEY_TYPE +diff --git a/crypto/asymmetric_keys/Makefile b/crypto/asymmetric_keys/Makefile +index 0727204..cd8388e 100644 +--- a/crypto/asymmetric_keys/Makefile ++++ b/crypto/asymmetric_keys/Makefile +@@ -8,6 +8,7 @@ asymmetric_keys-y := asymmetric_type.o signature.o + + obj-$(CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE) += public_key.o + obj-$(CONFIG_PUBLIC_KEY_ALGO_RSA) += rsa.o ++obj-$(CONFIG_EFI_SIGNATURE_LIST_PARSER) += efi_parser.o + + # + # X.509 Certificate handling +diff --git a/crypto/asymmetric_keys/efi_parser.c b/crypto/asymmetric_keys/efi_parser.c +new file mode 100644 +index 0000000..636feb1 +--- /dev/null ++++ b/crypto/asymmetric_keys/efi_parser.c +@@ -0,0 +1,108 @@ ++/* EFI signature/key/certificate list parser ++ * ++ * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved. ++ * Written by David Howells (dhowells@redhat.com) ++ * ++ * This program is free software; you can redistribute it and/or ++ * modify it under the terms of the GNU General Public Licence ++ * as published by the Free Software Foundation; either version ++ * 2 of the Licence, or (at your option) any later version. ++ */ ++ ++#define pr_fmt(fmt) "EFI: "fmt ++#include <linux/module.h> ++#include <linux/printk.h> ++#include <linux/err.h> ++#include <linux/efi.h> ++#include <keys/asymmetric-type.h> ++ ++static __initdata efi_guid_t efi_cert_x509_guid = EFI_CERT_X509_GUID; ++ ++/** ++ * parse_efi_signature_list - Parse an EFI signature list for certificates ++ * @data: The data blob to parse ++ * @size: The size of the data blob ++ * @keyring: The keyring to add extracted keys to ++ */ ++int __init parse_efi_signature_list(const void *data, size_t size, struct key *keyring) ++{ ++ unsigned offs = 0; ++ size_t lsize, esize, hsize, elsize; ++ ++ pr_devel("-->%s(,%zu)\n", __func__, size); ++ ++ while (size > 0) { ++ efi_signature_list_t list; ++ const efi_signature_data_t *elem; ++ key_ref_t key; ++ ++ if (size < sizeof(list)) ++ return -EBADMSG; ++ ++ memcpy(&list, data, sizeof(list)); ++ pr_devel("LIST[%04x] guid=%pUl ls=%x hs=%x ss=%x\n", ++ offs, ++ list.signature_type.b, list.signature_list_size, ++ list.signature_header_size, list.signature_size); ++ ++ lsize = list.signature_list_size; ++ hsize = list.signature_header_size; ++ esize = list.signature_size; ++ elsize = lsize - sizeof(list) - hsize; ++ ++ if (lsize > size) { ++ pr_devel("<--%s() = -EBADMSG [overrun @%x]\n", ++ __func__, offs); ++ return -EBADMSG; ++ } ++ if (lsize < sizeof(list) || ++ lsize - sizeof(list) < hsize || ++ esize < sizeof(*elem) || ++ elsize < esize || ++ elsize % esize != 0) { ++ pr_devel("- bad size combo @%x\n", offs); ++ return -EBADMSG; ++ } ++ ++ if (efi_guidcmp(list.signature_type, efi_cert_x509_guid) != 0) { ++ data += lsize; ++ size -= lsize; ++ offs += lsize; ++ continue; ++ } ++ ++ data += sizeof(list) + hsize; ++ size -= sizeof(list) + hsize; ++ offs += sizeof(list) + hsize; ++ ++ for (; elsize > 0; elsize -= esize) { ++ elem = data; ++ ++ pr_devel("ELEM[%04x]\n", offs); ++ ++ key = key_create_or_update( ++ make_key_ref(keyring, 1), ++ "asymmetric", ++ NULL, ++ &elem->signature_data, ++ esize - sizeof(*elem), ++ (KEY_POS_ALL & ~KEY_POS_SETATTR) | ++ KEY_USR_VIEW, ++ KEY_ALLOC_NOT_IN_QUOTA); ++ ++ if (IS_ERR(key)) ++ pr_err("Problem loading in-kernel X.509 certificate (%ld)\n", ++ PTR_ERR(key)); ++ else ++ pr_notice("Loaded cert '%s' linked to '%s'\n", ++ key_ref_to_ptr(key)->description, ++ keyring->description); ++ ++ data += esize; ++ size -= esize; ++ offs += esize; ++ } ++ } ++ ++ return 0; ++} +diff --git a/include/linux/efi.h b/include/linux/efi.h +index de7021d..64b3e55 100644 +--- a/include/linux/efi.h ++++ b/include/linux/efi.h +@@ -612,6 +612,10 @@ extern int efi_set_rtc_mmss(unsigned long nowtime); + extern void efi_reserve_boot_services(void); + extern struct efi_memory_map memmap; + ++struct key; ++extern int __init parse_efi_signature_list(const void *data, size_t size, ++ struct key *keyring); ++ + /** + * efi_range_is_wc - check the WC bit on an address range + * @start: starting kvirt address +-- +1.8.1 + + +From 9c9d291a605d1d0864d047cff75724ad1cb8b97d Mon Sep 17 00:00:00 2001 +From: Josh Boyer <jwboyer@redhat.com> +Date: Fri, 26 Oct 2012 12:36:24 -0400 +Subject: [PATCH 07/17] MODSIGN: Add module certificate blacklist keyring + +This adds an additional keyring that is used to store certificates that +are blacklisted. This keyring is searched first when loading signed modules +and if the module's certificate is found, it will refuse to load. This is +useful in cases where third party certificates are used for module signing. + +Signed-off-by: Josh Boyer <jwboyer@redhat.com> +--- + init/Kconfig | 8 ++++++++ + kernel/modsign_pubkey.c | 14 ++++++++++++++ + kernel/module-internal.h | 3 +++ + kernel/module_signing.c | 12 ++++++++++++ + 4 files changed, 37 insertions(+) + +diff --git a/init/Kconfig b/init/Kconfig +index be8b7f5..d972b77 100644 +--- a/init/Kconfig ++++ b/init/Kconfig +@@ -1665,6 +1665,14 @@ config MODULE_SIG_FORCE + Reject unsigned modules or signed modules for which we don't have a + key. Without this, such modules will simply taint the kernel. + ++config MODULE_SIG_BLACKLIST ++ bool "Support for blacklisting module signature certificates" ++ depends on MODULE_SIG ++ help ++ This adds support for keeping a blacklist of certificates that ++ should not pass module signature verification. If a module is ++ signed with something in this keyring, the load will be rejected. ++ + choice + prompt "Which hash algorithm should modules be signed with?" + depends on MODULE_SIG +diff --git a/kernel/modsign_pubkey.c b/kernel/modsign_pubkey.c +index 2b6e699..4cd408d 100644 +--- a/kernel/modsign_pubkey.c ++++ b/kernel/modsign_pubkey.c +@@ -17,6 +17,9 @@ + #include "module-internal.h" + + struct key *modsign_keyring; ++#ifdef CONFIG_MODULE_SIG_BLACKLIST ++struct key *modsign_blacklist; ++#endif + + extern __initdata const u8 modsign_certificate_list[]; + extern __initdata const u8 modsign_certificate_list_end[]; +@@ -43,6 +46,17 @@ static __init int module_verify_init(void) + if (IS_ERR(modsign_keyring)) + panic("Can't allocate module signing keyring\n"); + ++#ifdef CONFIG_MODULE_SIG_BLACKLIST ++ modsign_blacklist = keyring_alloc(".modsign_blacklist", ++ KUIDT_INIT(0), KGIDT_INIT(0), ++ current_cred(), ++ (KEY_POS_ALL & ~KEY_POS_SETATTR) | ++ KEY_USR_VIEW | KEY_USR_READ, ++ KEY_ALLOC_NOT_IN_QUOTA, NULL); ++ if (IS_ERR(modsign_blacklist)) ++ panic("Can't allocate module signing blacklist keyring\n"); ++#endif ++ + return 0; + } + +diff --git a/kernel/module-internal.h b/kernel/module-internal.h +index 24f9247..51a8380 100644 +--- a/kernel/module-internal.h ++++ b/kernel/module-internal.h +@@ -10,5 +10,8 @@ + */ + + extern struct key *modsign_keyring; ++#ifdef CONFIG_MODULE_SIG_BLACKLIST ++extern struct key *modsign_blacklist; ++#endif + + extern int mod_verify_sig(const void *mod, unsigned long *_modlen); +diff --git a/kernel/module_signing.c b/kernel/module_signing.c +index f2970bd..5423195 100644 +--- a/kernel/module_signing.c ++++ b/kernel/module_signing.c +@@ -157,6 +157,18 @@ static struct key *request_asymmetric_key(const char *signer, size_t signer_len, + + pr_debug("Look up: \"%s\"\n", id); + ++#ifdef CONFIG_MODULE_SIG_BLACKLIST ++ key = keyring_search(make_key_ref(modsign_blacklist, 1), ++ &key_type_asymmetric, id); ++ if (!IS_ERR(key)) { ++ /* module is signed with a cert in the blacklist. reject */ ++ pr_err("Module key '%s' is in blacklist\n", id); ++ key_ref_put(key); ++ kfree(id); ++ return ERR_PTR(-EKEYREJECTED); ++ } ++#endif ++ + key = keyring_search(make_key_ref(modsign_keyring, 1), + &key_type_asymmetric, id); + if (IS_ERR(key)) +-- +1.8.1 + + +From 4b85122267e2ac07833e20f0cac71c5c8c9ac65c Mon Sep 17 00:00:00 2001 +From: Josh Boyer <jwboyer@redhat.com> +Date: Fri, 26 Oct 2012 12:42:16 -0400 +Subject: [PATCH 08/17] MODSIGN: Import certificates from UEFI Secure Boot + +Secure Boot stores a list of allowed certificates in the 'db' variable. +This imports those certificates into the module signing keyring. This +allows for a third party signing certificate to be used in conjunction +with signed modules. By importing the public certificate into the 'db' +variable, a user can allow a module signed with that certificate to +load. The shim UEFI bootloader has a similar certificate list stored +in the 'MokListRT' variable. We import those as well. + +In the opposite case, Secure Boot maintains a list of disallowed +certificates in the 'dbx' variable. We load those certificates into +the newly introduced module blacklist keyring and forbid any module +signed with those from loading. + +Signed-off-by: Josh Boyer <jwboyer@redhat.com> +--- + include/linux/efi.h | 6 ++++ + init/Kconfig | 9 ++++++ + kernel/Makefile | 3 ++ + kernel/modsign_uefi.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++ + 4 files changed, 108 insertions(+) + create mode 100644 kernel/modsign_uefi.c + +diff --git a/include/linux/efi.h b/include/linux/efi.h +index 64b3e55..76fe526 100644 +--- a/include/linux/efi.h ++++ b/include/linux/efi.h +@@ -394,6 +394,12 @@ typedef efi_status_t efi_query_capsule_caps_t(efi_capsule_header_t **capsules, + #define EFI_CERT_X509_GUID \ + EFI_GUID( 0xa5c059a1, 0x94e4, 0x4aa7, 0x87, 0xb5, 0xab, 0x15, 0x5c, 0x2b, 0xf0, 0x72 ) + ++#define EFI_IMAGE_SECURITY_DATABASE_GUID \ ++ EFI_GUID( 0xd719b2cb, 0x3d3a, 0x4596, 0xa3, 0xbc, 0xda, 0xd0, 0x0e, 0x67, 0x65, 0x6f ) ++ ++#define EFI_SHIM_LOCK_GUID \ ++ EFI_GUID( 0x605dab50, 0xe046, 0x4300, 0xab, 0xb6, 0x3d, 0xd8, 0x10, 0xdd, 0x8b, 0x23 ) ++ + typedef struct { + efi_guid_t guid; + u64 table; +diff --git a/init/Kconfig b/init/Kconfig +index d972b77..27e3a82 100644 +--- a/init/Kconfig ++++ b/init/Kconfig +@@ -1673,6 +1673,15 @@ config MODULE_SIG_BLACKLIST + should not pass module signature verification. If a module is + signed with something in this keyring, the load will be rejected. + ++config MODULE_SIG_UEFI ++ bool "Allow modules signed with certs stored in UEFI" ++ depends on MODULE_SIG && MODULE_SIG_BLACKLIST && EFI ++ select EFI_SIGNATURE_LIST_PARSER ++ help ++ This will import certificates stored in UEFI and allow modules ++ signed with those to be loaded. It will also disallow loading ++ of modules stored in the UEFI dbx variable. ++ + choice + prompt "Which hash algorithm should modules be signed with?" + depends on MODULE_SIG +diff --git a/kernel/Makefile b/kernel/Makefile +index 6c072b6..8848829 100644 +--- a/kernel/Makefile ++++ b/kernel/Makefile +@@ -55,6 +55,7 @@ obj-$(CONFIG_PROVE_LOCKING) += spinlock.o + obj-$(CONFIG_UID16) += uid16.o + obj-$(CONFIG_MODULES) += module.o + obj-$(CONFIG_MODULE_SIG) += module_signing.o modsign_pubkey.o modsign_certificate.o ++obj-$(CONFIG_MODULE_SIG_UEFI) += modsign_uefi.o + obj-$(CONFIG_KALLSYMS) += kallsyms.o + obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o + obj-$(CONFIG_KEXEC) += kexec.o +@@ -114,6 +115,8 @@ obj-$(CONFIG_CONTEXT_TRACKING) += context_tracking.o + + $(obj)/configs.o: $(obj)/config_data.h + ++$(obj)/modsign_uefi.o: KBUILD_CFLAGS += -fshort-wchar ++ + # config_data.h contains the same information as ikconfig.h but gzipped. + # Info from config_data can be extracted from /proc/config* + targets += config_data.gz +diff --git a/kernel/modsign_uefi.c b/kernel/modsign_uefi.c +new file mode 100644 +index 0000000..b9237d7 +--- /dev/null ++++ b/kernel/modsign_uefi.c +@@ -0,0 +1,90 @@ ++#include <linux/kernel.h> ++#include <linux/sched.h> ++#include <linux/cred.h> ++#include <linux/err.h> ++#include <linux/efi.h> ++#include <keys/asymmetric-type.h> ++#include "module-internal.h" ++ ++static __init void *get_cert_list(efi_char16_t *name, efi_guid_t *guid, unsigned long *size) ++{ ++ efi_status_t status; ++ unsigned long lsize = 4; ++ unsigned long tmpdb[4]; ++ void *db = NULL; ++ ++ status = efi.get_variable(name, guid, NULL, &lsize, &tmpdb); ++ if (status != EFI_BUFFER_TOO_SMALL) { ++ pr_err("Couldn't get size: 0x%lx\n", status); ++ return NULL; ++ } ++ ++ db = kmalloc(lsize, GFP_KERNEL); ++ if (!db) { ++ pr_err("Couldn't allocate memory for uefi cert list\n"); ++ goto out; ++ } ++ ++ status = efi.get_variable(name, guid, NULL, &lsize, db); ++ if (status != EFI_SUCCESS) { ++ kfree(db); ++ db = NULL; ++ pr_err("Error reading db var: 0x%lx\n", status); ++ } ++out: ++ *size = lsize; ++ return db; ++} ++ ++/* ++ * * Load the certs contained in the UEFI databases ++ * */ ++static int __init load_uefi_certs(void) ++{ ++ efi_guid_t secure_var = EFI_IMAGE_SECURITY_DATABASE_GUID; ++ efi_guid_t mok_var = EFI_SHIM_LOCK_GUID; ++ void *db = NULL, *dbx = NULL, *mok = NULL; ++ unsigned long dbsize = 0, dbxsize = 0, moksize = 0; ++ int rc = 0; ++ ++ /* Check if SB is enabled and just return if not */ ++ if (!efi_enabled(EFI_SECURE_BOOT)) ++ return 0; ++ ++ /* Get db, MokListRT, and dbx. They might not exist, so it isn't ++ * an error if we can't get them. ++ */ ++ db = get_cert_list(L"db", &secure_var, &dbsize); ++ if (!db) { ++ pr_err("MODSIGN: Couldn't get UEFI db list\n"); ++ } else { ++ rc = parse_efi_signature_list(db, dbsize, modsign_keyring); ++ if (rc) ++ pr_err("Couldn't parse db signatures: %d\n", rc); ++ kfree(db); ++ } ++ ++ mok = get_cert_list(L"MokListRT", &mok_var, &moksize); ++ if (!mok) { ++ pr_info("MODSIGN: Couldn't get UEFI MokListRT\n"); ++ } else { ++ rc = parse_efi_signature_list(mok, moksize, modsign_keyring); ++ if (rc) ++ pr_err("Couldn't parse MokListRT signatures: %d\n", rc); ++ kfree(mok); ++ } ++ ++ dbx = get_cert_list(L"dbx", &secure_var, &dbxsize); ++ if (!dbx) { ++ pr_info("MODSIGN: Couldn't get UEFI dbx list\n"); ++ } else { ++ rc = parse_efi_signature_list(dbx, dbxsize, ++ modsign_blacklist); ++ if (rc) ++ pr_err("Couldn't parse dbx signatures: %d\n", rc); ++ kfree(dbx); ++ } ++ ++ return rc; ++} ++late_initcall(load_uefi_certs); +-- +1.8.1 + + +From e6f51e0b73bdaf0bb8d6ebc07e041ce3b6126e9c Mon Sep 17 00:00:00 2001 +From: Matthew Garrett <mjg@redhat.com> +Date: Thu, 20 Sep 2012 10:40:57 -0400 +Subject: [PATCH 09/17] PCI: Lock down BAR access in secure boot environments + +Any hardware that can potentially generate DMA has to be locked down from +userspace in order to avoid it being possible for an attacker to cause +arbitrary kernel behaviour. Default to paranoid - in future we can +potentially relax this for sufficiently IOMMU-isolated devices. + +Signed-off-by: Matthew Garrett <mjg@redhat.com> +--- + drivers/pci/pci-sysfs.c | 9 +++++++++ + drivers/pci/proc.c | 8 +++++++- + drivers/pci/syscall.c | 2 +- + 3 files changed, 17 insertions(+), 2 deletions(-) + +diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c +index 9c6e9bb..b966089 100644 +--- a/drivers/pci/pci-sysfs.c ++++ b/drivers/pci/pci-sysfs.c +@@ -622,6 +622,9 @@ pci_write_config(struct file* filp, struct kobject *kobj, + loff_t init_off = off; + u8 *data = (u8*) buf; + ++ if (!capable(CAP_COMPROMISE_KERNEL)) ++ return -EPERM; ++ + if (off > dev->cfg_size) + return 0; + if (off + count > dev->cfg_size) { +@@ -928,6 +931,9 @@ pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr, + resource_size_t start, end; + int i; + ++ if (!capable(CAP_COMPROMISE_KERNEL)) ++ return -EPERM; ++ + for (i = 0; i < PCI_ROM_RESOURCE; i++) + if (res == &pdev->resource[i]) + break; +@@ -1035,6 +1041,9 @@ pci_write_resource_io(struct file *filp, struct kobject *kobj, + struct bin_attribute *attr, char *buf, + loff_t off, size_t count) + { ++ if (!capable(CAP_COMPROMISE_KERNEL)) ++ return -EPERM; ++ + return pci_resource_io(filp, kobj, attr, buf, off, count, true); + } + +diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c +index 9b8505c..35580bc 100644 +--- a/drivers/pci/proc.c ++++ b/drivers/pci/proc.c +@@ -139,6 +139,9 @@ proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, lof + int size = dp->size; + int cnt; + ++ if (!capable(CAP_COMPROMISE_KERNEL)) ++ return -EPERM; ++ + if (pos >= size) + return 0; + if (nbytes >= size) +@@ -219,6 +222,9 @@ static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd, + #endif /* HAVE_PCI_MMAP */ + int ret = 0; + ++ if (!capable(CAP_COMPROMISE_KERNEL)) ++ return -EPERM; ++ + switch (cmd) { + case PCIIOC_CONTROLLER: + ret = pci_domain_nr(dev->bus); +@@ -259,7 +265,7 @@ static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma) + struct pci_filp_private *fpriv = file->private_data; + int i, ret; + +- if (!capable(CAP_SYS_RAWIO)) ++ if (!capable(CAP_SYS_RAWIO) || !capable(CAP_COMPROMISE_KERNEL)) + return -EPERM; + + /* Make sure the caller is mapping a real resource for this device */ +diff --git a/drivers/pci/syscall.c b/drivers/pci/syscall.c +index e1c1ec5..97e785f 100644 +--- a/drivers/pci/syscall.c ++++ b/drivers/pci/syscall.c +@@ -92,7 +92,7 @@ SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn, + u32 dword; + int err = 0; + +- if (!capable(CAP_SYS_ADMIN)) ++ if (!capable(CAP_SYS_ADMIN) || !capable(CAP_COMPROMISE_KERNEL)) + return -EPERM; + + dev = pci_get_bus_and_slot(bus, dfn); +-- +1.8.1 + + +From c4399308a252ca147971bd6d2f1f56557f279201 Mon Sep 17 00:00:00 2001 +From: Matthew Garrett <mjg@redhat.com> +Date: Thu, 20 Sep 2012 10:40:58 -0400 +Subject: [PATCH 10/17] x86: Lock down IO port access in secure boot + environments + +IO port access would permit users to gain access to PCI configuration +registers, which in turn (on a lot of hardware) give access to MMIO register +space. This would potentially permit root to trigger arbitrary DMA, so lock +it down by default. + +Signed-off-by: Matthew Garrett <mjg@redhat.com> +--- + arch/x86/kernel/ioport.c | 4 ++-- + drivers/char/mem.c | 3 +++ + 2 files changed, 5 insertions(+), 2 deletions(-) + +diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c +index 8c96897..a2578c4 100644 +--- a/arch/x86/kernel/ioport.c ++++ b/arch/x86/kernel/ioport.c +@@ -28,7 +28,7 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on) + + if ((from + num <= from) || (from + num > IO_BITMAP_BITS)) + return -EINVAL; +- if (turn_on && !capable(CAP_SYS_RAWIO)) ++ if (turn_on && (!capable(CAP_SYS_RAWIO) || !capable(CAP_COMPROMISE_KERNEL))) + return -EPERM; + + /* +@@ -102,7 +102,7 @@ long sys_iopl(unsigned int level, struct pt_regs *regs) + return -EINVAL; + /* Trying to gain more privileges? */ + if (level > old) { +- if (!capable(CAP_SYS_RAWIO)) ++ if (!capable(CAP_SYS_RAWIO) || !capable(CAP_COMPROMISE_KERNEL)) + return -EPERM; + } + regs->flags = (regs->flags & ~X86_EFLAGS_IOPL) | (level << 12); +diff --git a/drivers/char/mem.c b/drivers/char/mem.c +index c6fa3bc..fc28099 100644 +--- a/drivers/char/mem.c ++++ b/drivers/char/mem.c +@@ -597,6 +597,9 @@ static ssize_t write_port(struct file *file, const char __user *buf, + unsigned long i = *ppos; + const char __user * tmp = buf; + ++ if (!capable(CAP_COMPROMISE_KERNEL)) ++ return -EPERM; ++ + if (!access_ok(VERIFY_READ, buf, count)) + return -EFAULT; + while (count-- > 0 && i < 65536) { +-- +1.8.1 + + +From b3e2bb87699c1b0aa235c772c1c5ae376b63ea49 Mon Sep 17 00:00:00 2001 +From: Matthew Garrett <mjg@redhat.com> +Date: Thu, 20 Sep 2012 10:40:59 -0400 +Subject: [PATCH 11/17] ACPI: Limit access to custom_method + +It must be impossible for even root to get code executed in kernel context +under a secure boot environment. custom_method effectively allows arbitrary +access to system memory, so it needs to have a capability check here. + +Signed-off-by: Matthew Garrett <mjg@redhat.com> +--- + drivers/acpi/custom_method.c | 3 +++ + 1 file changed, 3 insertions(+) + +diff --git a/drivers/acpi/custom_method.c b/drivers/acpi/custom_method.c +index 5d42c24..247d58b 100644 +--- a/drivers/acpi/custom_method.c ++++ b/drivers/acpi/custom_method.c +@@ -29,6 +29,9 @@ static ssize_t cm_write(struct file *file, const char __user * user_buf, + struct acpi_table_header table; + acpi_status status; + ++ if (!capable(CAP_COMPROMISE_KERNEL)) ++ return -EPERM; ++ + if (!(*ppos)) { + /* parse the table header to get the table length */ + if (count <= sizeof(struct acpi_table_header)) +-- +1.8.1 + + +From 300b9cc9e0833d66b0ea49c259c1e2f7dfe7de12 Mon Sep 17 00:00:00 2001 +From: Matthew Garrett <mjg@redhat.com> +Date: Thu, 20 Sep 2012 10:41:00 -0400 +Subject: [PATCH 12/17] asus-wmi: Restrict debugfs interface + +We have no way of validating what all of the Asus WMI methods do on a +given machine, and there's a risk that some will allow hardware state to +be manipulated in such a way that arbitrary code can be executed in the +kernel. Add a capability check to prevent that. + +Signed-off-by: Matthew Garrett <mjg@redhat.com> +--- + drivers/platform/x86/asus-wmi.c | 9 +++++++++ + 1 file changed, 9 insertions(+) + +diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c +index f80ae4d..059195f 100644 +--- a/drivers/platform/x86/asus-wmi.c ++++ b/drivers/platform/x86/asus-wmi.c +@@ -1521,6 +1521,9 @@ static int show_dsts(struct seq_file *m, void *data) + int err; + u32 retval = -1; + ++ if (!capable(CAP_COMPROMISE_KERNEL)) ++ return -EPERM; ++ + err = asus_wmi_get_devstate(asus, asus->debug.dev_id, &retval); + + if (err < 0) +@@ -1537,6 +1540,9 @@ static int show_devs(struct seq_file *m, void *data) + int err; + u32 retval = -1; + ++ if (!capable(CAP_COMPROMISE_KERNEL)) ++ return -EPERM; ++ + err = asus_wmi_set_devstate(asus->debug.dev_id, asus->debug.ctrl_param, + &retval); + +@@ -1561,6 +1567,9 @@ static int show_call(struct seq_file *m, void *data) + union acpi_object *obj; + acpi_status status; + ++ if (!capable(CAP_COMPROMISE_KERNEL)) ++ return -EPERM; ++ + status = wmi_evaluate_method(ASUS_WMI_MGMT_GUID, + 1, asus->debug.method_id, + &input, &output); +-- +1.8.1 + + +From 690713487cf5ac3949cf915e28a75a1270e2c2a6 Mon Sep 17 00:00:00 2001 +From: Matthew Garrett <mjg@redhat.com> +Date: Thu, 20 Sep 2012 10:41:01 -0400 +Subject: [PATCH 13/17] Restrict /dev/mem and /dev/kmem in secure boot setups + +Allowing users to write to address space makes it possible for the kernel +to be subverted. Restrict this when we need to protect the kernel. + +Signed-off-by: Matthew Garrett <mjg@redhat.com> +--- + drivers/char/mem.c | 6 ++++++ + 1 file changed, 6 insertions(+) + +diff --git a/drivers/char/mem.c b/drivers/char/mem.c +index fc28099..b5df7a8 100644 +--- a/drivers/char/mem.c ++++ b/drivers/char/mem.c +@@ -158,6 +158,9 @@ static ssize_t write_mem(struct file *file, const char __user *buf, + unsigned long copied; + void *ptr; + ++ if (!capable(CAP_COMPROMISE_KERNEL)) ++ return -EPERM; ++ + if (!valid_phys_addr_range(p, count)) + return -EFAULT; + +@@ -530,6 +533,9 @@ static ssize_t write_kmem(struct file *file, const char __user *buf, + char * kbuf; /* k-addr because vwrite() takes vmlist_lock rwlock */ + int err = 0; + ++ if (!capable(CAP_COMPROMISE_KERNEL)) ++ return -EPERM; ++ + if (p < (unsigned long) high_memory) { + unsigned long to_write = min_t(unsigned long, count, + (unsigned long)high_memory - p); +-- +1.8.1 + + +From 170cc9e113785b6f38cbd4bf5d8bbd42d844d119 Mon Sep 17 00:00:00 2001 +From: Josh Boyer <jwboyer@redhat.com> +Date: Thu, 20 Sep 2012 10:41:04 -0400 +Subject: [PATCH 14/17] acpi: Ignore acpi_rsdp kernel parameter in a secure + boot environment + +This option allows userspace to pass the RSDP address to the kernel. This +could potentially be used to circumvent the secure boot trust model. +We ignore the setting if we don't have the CAP_COMPROMISE_KERNEL capability. + +Signed-off-by: Josh Boyer <jwboyer@redhat.com> +--- + drivers/acpi/osl.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c +index bd22f86..88251d2 100644 +--- a/drivers/acpi/osl.c ++++ b/drivers/acpi/osl.c +@@ -246,7 +246,7 @@ early_param("acpi_rsdp", setup_acpi_rsdp); + acpi_physical_address __init acpi_os_get_root_pointer(void) + { + #ifdef CONFIG_KEXEC +- if (acpi_rsdp) ++ if (acpi_rsdp && capable(CAP_COMPROMISE_KERNEL)) + return acpi_rsdp; + #endif + +-- +1.8.1 + + +From eb021ca148e35633480ece4b472807a621ca9a5f Mon Sep 17 00:00:00 2001 +From: Matthew Garrett <mjg@redhat.com> +Date: Tue, 4 Sep 2012 11:55:13 -0400 +Subject: [PATCH 15/17] kexec: Disable in a secure boot environment + +kexec could be used as a vector for a malicious user to use a signed kernel +to circumvent the secure boot trust model. In the long run we'll want to +support signed kexec payloads, but for the moment we should just disable +loading entirely in that situation. + +Signed-off-by: Matthew Garrett <mjg@redhat.com> +--- + kernel/kexec.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/kernel/kexec.c b/kernel/kexec.c +index 5e4bd78..dd464e0 100644 +--- a/kernel/kexec.c ++++ b/kernel/kexec.c +@@ -943,7 +943,7 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments, + int result; + + /* We only trust the superuser with rebooting the system. */ +- if (!capable(CAP_SYS_BOOT)) ++ if (!capable(CAP_SYS_BOOT) || !capable(CAP_COMPROMISE_KERNEL)) + return -EPERM; + + /* +-- +1.8.1 + + +From f170b22efeffede02664836a24604febd85ca061 Mon Sep 17 00:00:00 2001 +From: Josh Boyer <jwboyer@redhat.com> +Date: Fri, 5 Oct 2012 10:12:48 -0400 +Subject: [PATCH 16/17] MODSIGN: Always enforce module signing in a Secure Boot + environment + +If a machine is booted into a Secure Boot environment, we need to +protect the trust model. This requires that all modules be signed +with a key that is in the kernel's _modsign keyring. The checks for +this are already done via the 'sig_enforce' module parameter. Make +this visible within the kernel and force it to be true. + +Signed-off-by: Josh Boyer <jwboyer@redhat.com> +--- + kernel/cred.c | 8 ++++++++ + kernel/module.c | 4 ++-- + 2 files changed, 10 insertions(+), 2 deletions(-) + +diff --git a/kernel/cred.c b/kernel/cred.c +index c3f4e3e..c5554e0 100644 +--- a/kernel/cred.c ++++ b/kernel/cred.c +@@ -565,11 +565,19 @@ void __init cred_init(void) + 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); + } + ++#ifdef CONFIG_MODULE_SIG ++extern bool sig_enforce; ++#endif ++ + void __init secureboot_enable() + { + pr_info("Secure boot enabled\n"); + cap_lower((&init_cred)->cap_bset, CAP_COMPROMISE_KERNEL); + cap_lower((&init_cred)->cap_permitted, CAP_COMPROMISE_KERNEL); ++#ifdef CONFIG_MODULE_SIG ++ /* Enable module signature enforcing */ ++ sig_enforce = true; ++#endif + } + + /* Dummy Secure Boot enable option to fake out UEFI SB=1 */ +diff --git a/kernel/module.c b/kernel/module.c +index eab0827..93a16dc 100644 +--- a/kernel/module.c ++++ b/kernel/module.c +@@ -109,9 +109,9 @@ struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ + + #ifdef CONFIG_MODULE_SIG + #ifdef CONFIG_MODULE_SIG_FORCE +-static bool sig_enforce = true; ++bool sig_enforce = true; + #else +-static bool sig_enforce = false; ++bool sig_enforce = false; + + static int param_set_bool_enable_only(const char *val, + const struct kernel_param *kp) +-- +1.8.1 + + +From c44db6a096f11bd19182cb52c70fbd2f3de3dc6a Mon Sep 17 00:00:00 2001 +From: Josh Boyer <jwboyer@redhat.com> +Date: Fri, 26 Oct 2012 14:02:09 -0400 +Subject: [PATCH 17/17] hibernate: Disable in a Secure Boot environment + +There is currently no way to verify the resume image when returning +from hibernate. This might compromise the secure boot trust model, +so until we can work with signed hibernate images we disable it in +a Secure Boot environment. + +Signed-off-by: Josh Boyer <jwboyer@redhat.com> +--- + kernel/power/hibernate.c | 15 ++++++++++++++- + kernel/power/main.c | 7 ++++++- + kernel/power/user.c | 3 +++ + 3 files changed, 23 insertions(+), 2 deletions(-) + +diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c +index b26f5f1..7f63cb4 100644 +--- a/kernel/power/hibernate.c ++++ b/kernel/power/hibernate.c +@@ -28,6 +28,7 @@ + #include <linux/syscore_ops.h> + #include <linux/ctype.h> + #include <linux/genhd.h> ++#include <linux/efi.h> + + #include "power.h" + +@@ -632,6 +633,10 @@ int hibernate(void) + { + int error; + ++ if (!capable(CAP_COMPROMISE_KERNEL)) { ++ return -EPERM; ++ } ++ + lock_system_sleep(); + /* The snapshot device should not be opened while we're running */ + if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { +@@ -723,7 +728,7 @@ static int software_resume(void) + /* + * If the user said "noresume".. bail out early. + */ +- if (noresume) ++ if (noresume || !capable(CAP_COMPROMISE_KERNEL)) + return 0; + + /* +@@ -889,6 +894,11 @@ static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, + int i; + char *start = buf; + ++ if (efi_enabled(EFI_SECURE_BOOT)) { ++ buf += sprintf(buf, "[%s]\n", "disabled"); ++ return buf-start; ++ } ++ + for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { + if (!hibernation_modes[i]) + continue; +@@ -923,6 +933,9 @@ static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, + char *p; + int mode = HIBERNATION_INVALID; + ++ if (!capable(CAP_COMPROMISE_KERNEL)) ++ return -EPERM; ++ + p = memchr(buf, '\n', n); + len = p ? p - buf : n; + +diff --git a/kernel/power/main.c b/kernel/power/main.c +index 1c16f91..4f915fc 100644 +--- a/kernel/power/main.c ++++ b/kernel/power/main.c +@@ -15,6 +15,7 @@ + #include <linux/workqueue.h> + #include <linux/debugfs.h> + #include <linux/seq_file.h> ++#include <linux/efi.h> + + #include "power.h" + +@@ -301,7 +302,11 @@ static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, + } + #endif + #ifdef CONFIG_HIBERNATION +- s += sprintf(s, "%s\n", "disk"); ++ if (!efi_enabled(EFI_SECURE_BOOT)) { ++ s += sprintf(s, "%s\n", "disk"); ++ } else { ++ s += sprintf(s, "\n"); ++ } + #else + if (s != buf) + /* convert the last space to a newline */ +diff --git a/kernel/power/user.c b/kernel/power/user.c +index 4ed81e7..b11a0f4 100644 +--- a/kernel/power/user.c ++++ b/kernel/power/user.c +@@ -48,6 +48,9 @@ static int snapshot_open(struct inode *inode, struct file *filp) + struct snapshot_data *data; + int error; + ++ if (!capable(CAP_COMPROMISE_KERNEL)) ++ return -EPERM; ++ + lock_system_sleep(); + + if (!atomic_add_unless(&snapshot_device_available, -1, 0)) { +-- +1.8.1 + |