From 3162534069597e34dd0ac9eb711be8dc23835ae7 Mon Sep 17 00:00:00 2001 From: Joseph Cihula Date: Tue, 30 Jun 2009 19:30:59 -0700 Subject: x86, intel_txt: Intel TXT boot support This patch adds kernel configuration and boot support for Intel Trusted Execution Technology (Intel TXT). Intel's technology for safer computing, Intel Trusted Execution Technology (Intel TXT), defines platform-level enhancements that provide the building blocks for creating trusted platforms. Intel TXT was formerly known by the code name LaGrande Technology (LT). Intel TXT in Brief: o Provides dynamic root of trust for measurement (DRTM) o Data protection in case of improper shutdown o Measurement and verification of launched environment Intel TXT is part of the vPro(TM) brand and is also available some non-vPro systems. It is currently available on desktop systems based on the Q35, X38, Q45, and Q43 Express chipsets (e.g. Dell Optiplex 755, HP dc7800, etc.) and mobile systems based on the GM45, PM45, and GS45 Express chipsets. For more information, see http://www.intel.com/technology/security/. This site also has a link to the Intel TXT MLE Developers Manual, which has been updated for the new released platforms. A much more complete description of how these patches support TXT, how to configure a system for it, etc. is in the Documentation/intel_txt.txt file in this patch. This patch provides the TXT support routines for complete functionality, documentation for TXT support and for the changes to the boot_params structure, and boot detection of a TXT launch. Attempts to shutdown (reboot, Sx) the system will result in platform resets; subsequent patches will support these shutdown modes properly. Documentation/intel_txt.txt | 210 +++++++++++++++++++++ Documentation/x86/zero-page.txt | 1 arch/x86/include/asm/bootparam.h | 3 arch/x86/include/asm/fixmap.h | 3 arch/x86/include/asm/tboot.h | 197 ++++++++++++++++++++ arch/x86/kernel/Makefile | 1 arch/x86/kernel/setup.c | 4 arch/x86/kernel/tboot.c | 379 +++++++++++++++++++++++++++++++++++++++ security/Kconfig | 30 +++ 9 files changed, 827 insertions(+), 1 deletion(-) Signed-off-by: Joseph Cihula Signed-off-by: Shane Wang Signed-off-by: Gang Wei Signed-off-by: H. Peter Anvin --- arch/x86/include/asm/bootparam.h | 3 +- arch/x86/include/asm/fixmap.h | 3 + arch/x86/include/asm/tboot.h | 197 ++++++++++++++++++++ arch/x86/kernel/Makefile | 1 + arch/x86/kernel/setup.c | 4 + arch/x86/kernel/tboot.c | 379 +++++++++++++++++++++++++++++++++++++++ 6 files changed, 586 insertions(+), 1 deletion(-) create mode 100644 arch/x86/include/asm/tboot.h create mode 100644 arch/x86/kernel/tboot.c (limited to 'arch') diff --git a/arch/x86/include/asm/bootparam.h b/arch/x86/include/asm/bootparam.h index 1724e8de317..6ca20218dd7 100644 --- a/arch/x86/include/asm/bootparam.h +++ b/arch/x86/include/asm/bootparam.h @@ -85,7 +85,8 @@ struct efi_info { struct boot_params { struct screen_info screen_info; /* 0x000 */ struct apm_bios_info apm_bios_info; /* 0x040 */ - __u8 _pad2[12]; /* 0x054 */ + __u8 _pad2[4]; /* 0x054 */ + __u64 tboot_addr; /* 0x058 */ struct ist_info ist_info; /* 0x060 */ __u8 _pad3[16]; /* 0x070 */ __u8 hd0_info[16]; /* obsolete! */ /* 0x080 */ diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h index 7b2d71df39a..14f9890eb49 100644 --- a/arch/x86/include/asm/fixmap.h +++ b/arch/x86/include/asm/fixmap.h @@ -131,6 +131,9 @@ enum fixed_addresses { #endif #ifdef CONFIG_X86_32 FIX_WP_TEST, +#endif +#ifdef CONFIG_INTEL_TXT + FIX_TBOOT_BASE, #endif __end_of_fixed_addresses }; diff --git a/arch/x86/include/asm/tboot.h b/arch/x86/include/asm/tboot.h new file mode 100644 index 00000000000..b13929d4e5f --- /dev/null +++ b/arch/x86/include/asm/tboot.h @@ -0,0 +1,197 @@ +/* + * tboot.h: shared data structure with tboot and kernel and functions + * used by kernel for runtime support of Intel(R) Trusted + * Execution Technology + * + * Copyright (c) 2006-2009, Intel Corporation + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + */ + +#ifndef _ASM_TBOOT_H +#define _ASM_TBOOT_H + +#include + +/* these must have the values from 0-5 in this order */ +enum { + TB_SHUTDOWN_REBOOT = 0, + TB_SHUTDOWN_S5, + TB_SHUTDOWN_S4, + TB_SHUTDOWN_S3, + TB_SHUTDOWN_HALT, + TB_SHUTDOWN_WFS +}; + +#ifdef CONFIG_INTEL_TXT + +/* used to communicate between tboot and the launched kernel */ + +#define TB_KEY_SIZE 64 /* 512 bits */ + +#define MAX_TB_MAC_REGIONS 32 + +struct tboot_mac_region { + u64 start; /* must be 64 byte -aligned */ + u32 size; /* must be 64 byte -granular */ +} __packed; + +/* GAS - Generic Address Structure (ACPI 2.0+) */ +struct tboot_acpi_generic_address { + u8 space_id; + u8 bit_width; + u8 bit_offset; + u8 access_width; + u64 address; +} __packed; + +/* + * combines Sx info from FADT and FACS tables per ACPI 2.0+ spec + * (http://www.acpi.info/) + */ +struct tboot_acpi_sleep_info { + struct tboot_acpi_generic_address pm1a_cnt_blk; + struct tboot_acpi_generic_address pm1b_cnt_blk; + struct tboot_acpi_generic_address pm1a_evt_blk; + struct tboot_acpi_generic_address pm1b_evt_blk; + u16 pm1a_cnt_val; + u16 pm1b_cnt_val; + u64 wakeup_vector; + u32 vector_width; + u64 kernel_s3_resume_vector; +} __packed; + +/* + * shared memory page used for communication between tboot and kernel + */ +struct tboot { + /* + * version 3+ fields: + */ + + /* TBOOT_UUID */ + u8 uuid[16]; + + /* version number: 5 is current */ + u32 version; + + /* physical addr of tb_log_t log */ + u32 log_addr; + + /* + * physical addr of entry point for tboot shutdown and + * type of shutdown (TB_SHUTDOWN_*) being requested + */ + u32 shutdown_entry; + u32 shutdown_type; + + /* kernel-specified ACPI info for Sx shutdown */ + struct tboot_acpi_sleep_info acpi_sinfo; + + /* tboot location in memory (physical) */ + u32 tboot_base; + u32 tboot_size; + + /* memory regions (phys addrs) for tboot to MAC on S3 */ + u8 num_mac_regions; + struct tboot_mac_region mac_regions[MAX_TB_MAC_REGIONS]; + + + /* + * version 4+ fields: + */ + + /* symmetric key for use by kernel; will be encrypted on S3 */ + u8 s3_key[TB_KEY_SIZE]; + + + /* + * version 5+ fields: + */ + + /* used to 4byte-align num_in_wfs */ + u8 reserved_align[3]; + + /* number of processors in wait-for-SIPI */ + u32 num_in_wfs; +} __packed; + +/* + * UUID for tboot data struct to facilitate matching + * defined as {663C8DFF-E8B3-4b82-AABF-19EA4D057A08} by tboot, which is + * represented as {} in the char array used here + */ +#define TBOOT_UUID {0xff, 0x8d, 0x3c, 0x66, 0xb3, 0xe8, 0x82, 0x4b, 0xbf,\ + 0xaa, 0x19, 0xea, 0x4d, 0x5, 0x7a, 0x8} + +extern struct tboot *tboot; + +static inline int tboot_enabled(void) +{ + return tboot != NULL; +} + +extern void tboot_probe(void); +extern void tboot_create_trampoline(void); +extern void tboot_shutdown(u32 shutdown_type); +extern void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control); +extern int tboot_wait_for_aps(int num_aps); +extern struct acpi_table_header *tboot_get_dmar_table( + struct acpi_table_header *dmar_tbl); +extern int tboot_force_iommu(void); + +#else /* CONFIG_INTEL_TXT */ + +static inline int tboot_enabled(void) +{ + return 0; +} + +static inline void tboot_probe(void) +{ +} + +static inline void tboot_create_trampoline(void) +{ +} + +static inline void tboot_shutdown(u32 shutdown_type) +{ +} + +static inline void tboot_sleep(u8 sleep_state, u32 pm1a_control, + u32 pm1b_control) +{ +} + +static inline int tboot_wait_for_aps(int num_aps) +{ + return 0; +} + +static inline struct acpi_table_header *tboot_get_dmar_table( + struct acpi_table_header *dmar_tbl) +{ + return dmar_tbl; +} + +static inline int tboot_force_iommu(void) +{ + return 0; +} + +#endif /* !CONFIG_INTEL_TXT */ + +#endif /* _ASM_TBOOT_H */ diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index 430d5b24af7..832cb838cb4 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -52,6 +52,7 @@ obj-$(CONFIG_X86_DS_SELFTEST) += ds_selftest.o obj-$(CONFIG_X86_32) += tls.o obj-$(CONFIG_IA32_EMULATION) += tls.o obj-y += step.o +obj-$(CONFIG_INTEL_TXT) += tboot.o obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-y += cpu/ obj-y += acpi/ diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index de2cab13284..80d6e9e3248 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -145,6 +145,8 @@ struct boot_params __initdata boot_params; struct boot_params boot_params; #endif +#include + /* * Machine setup.. */ @@ -964,6 +966,8 @@ void __init setup_arch(char **cmdline_p) paravirt_pagetable_setup_done(swapper_pg_dir); paravirt_post_allocator_init(); + tboot_probe(); + #ifdef CONFIG_X86_64 map_vsyscall(); #endif diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c new file mode 100644 index 00000000000..263591afd29 --- /dev/null +++ b/arch/x86/kernel/tboot.c @@ -0,0 +1,379 @@ +/* + * tboot.c: main implementation of helper functions used by kernel for + * runtime support of Intel(R) Trusted Execution Technology + * + * Copyright (c) 2006-2009, Intel Corporation + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "acpi/realmode/wakeup.h" + +/* Global pointer to shared data; NULL means no measured launch. */ +struct tboot *tboot __read_mostly; + +/* timeout for APs (in secs) to enter wait-for-SIPI state during shutdown */ +#define AP_WAIT_TIMEOUT 1 + +#undef pr_fmt +#define pr_fmt(fmt) "tboot: " fmt + +static u8 tboot_uuid[16] __initdata = TBOOT_UUID; + +void __init tboot_probe(void) +{ + /* Look for valid page-aligned address for shared page. */ + if (!boot_params.tboot_addr) + return; + /* + * also verify that it is mapped as we expect it before calling + * set_fixmap(), to reduce chance of garbage value causing crash + */ + if (!e820_any_mapped(boot_params.tboot_addr, + boot_params.tboot_addr, E820_RESERVED)) { + pr_warning("non-0 tboot_addr but it is not of type E820_RESERVED\n"); + return; + } + + /* only a natively booted kernel should be using TXT */ + if (paravirt_enabled()) { + pr_warning("non-0 tboot_addr but pv_ops is enabled\n"); + return; + } + + /* Map and check for tboot UUID. */ + set_fixmap(FIX_TBOOT_BASE, boot_params.tboot_addr); + tboot = (struct tboot *)fix_to_virt(FIX_TBOOT_BASE); + if (memcmp(&tboot_uuid, &tboot->uuid, sizeof(tboot->uuid))) { + pr_warning("tboot at 0x%llx is invalid\n", + boot_params.tboot_addr); + tboot = NULL; + return; + } + if (tboot->version < 5) { + pr_warning("tboot version is invalid: %u\n", tboot->version); + tboot = NULL; + return; + } + + pr_info("found shared page at phys addr 0x%llx:\n", + boot_params.tboot_addr); + pr_debug("version: %d\n", tboot->version); + pr_debug("log_addr: 0x%08x\n", tboot->log_addr); + pr_debug("shutdown_entry: 0x%x\n", tboot->shutdown_entry); + pr_debug("tboot_base: 0x%08x\n", tboot->tboot_base); + pr_debug("tboot_size: 0x%x\n", tboot->tboot_size); +} + +static pgd_t *tboot_pg_dir; +static struct mm_struct tboot_mm = { + .mm_rb = RB_ROOT, + .pgd = swapper_pg_dir, + .mm_users = ATOMIC_INIT(2), + .mm_count = ATOMIC_INIT(1), + .mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem), + .page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock), + .mmlist = LIST_HEAD_INIT(init_mm.mmlist), + .cpu_vm_mask = CPU_MASK_ALL, +}; + +static inline void switch_to_tboot_pt(void) +{ + write_cr3(virt_to_phys(tboot_pg_dir)); +} + +static int map_tboot_page(unsigned long vaddr, unsigned long pfn, + pgprot_t prot) +{ + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + pte_t *pte; + + pgd = pgd_offset(&tboot_mm, vaddr); + pud = pud_alloc(&tboot_mm, pgd, vaddr); + if (!pud) + return -1; + pmd = pmd_alloc(&tboot_mm, pud, vaddr); + if (!pmd) + return -1; + pte = pte_alloc_map(&tboot_mm, pmd, vaddr); + if (!pte) + return -1; + set_pte_at(&tboot_mm, vaddr, pte, pfn_pte(pfn, prot)); + pte_unmap(pte); + return 0; +} + +static int map_tboot_pages(unsigned long vaddr, unsigned long start_pfn, + unsigned long nr) +{ + /* Reuse the original kernel mapping */ + tboot_pg_dir = pgd_alloc(&tboot_mm); + if (!tboot_pg_dir) + return -1; + + for (; nr > 0; nr--, vaddr += PAGE_SIZE, start_pfn++) { + if (map_tboot_page(vaddr, start_pfn, PAGE_KERNEL_EXEC)) + return -1; + } + + return 0; +} + +void tboot_create_trampoline(void) +{ + u32 map_base, map_size; + + if (!tboot_enabled()) + return; + + /* Create identity map for tboot shutdown code. */ + map_base = PFN_DOWN(tboot->tboot_base); + map_size = PFN_UP(tboot->tboot_size); + if (map_tboot_pages(map_base << PAGE_SHIFT, map_base, map_size)) + panic("tboot: Error mapping tboot pages (mfns) @ 0x%x, 0x%x\n", map_base, map_size); +} + +static void set_mac_regions(void) +{ + tboot->num_mac_regions = 3; + /* S3 resume code */ + tboot->mac_regions[0].start = PFN_PHYS(PFN_DOWN(acpi_wakeup_address)); + tboot->mac_regions[0].size = PFN_UP(WAKEUP_SIZE) << PAGE_SHIFT; + /* AP trampoline code */ + tboot->mac_regions[1].start = + PFN_PHYS(PFN_DOWN(virt_to_phys(trampoline_base))); + tboot->mac_regions[1].size = PFN_UP(TRAMPOLINE_SIZE) << PAGE_SHIFT; + /* kernel code + data + bss */ + tboot->mac_regions[2].start = PFN_PHYS(PFN_DOWN(virt_to_phys(&_text))); + tboot->mac_regions[2].size = PFN_PHYS(PFN_UP(virt_to_phys(&_end))) - + PFN_PHYS(PFN_DOWN(virt_to_phys(&_text))); +} + +void tboot_shutdown(u32 shutdown_type) +{ + void (*shutdown)(void); + + if (!tboot_enabled()) + return; + + /* + * if we're being called before the 1:1 mapping is set up then just + * return and let the normal shutdown happen; this should only be + * due to very early panic() + */ + if (!tboot_pg_dir) + return; + + /* if this is S3 then set regions to MAC */ + if (shutdown_type == TB_SHUTDOWN_S3) + set_mac_regions(); + + tboot->shutdown_type = shutdown_type; + + switch_to_tboot_pt(); + + shutdown = (void(*)(void))(unsigned long)tboot->shutdown_entry; + shutdown(); + + /* should not reach here */ + while (1) + halt(); +} + +static void tboot_copy_fadt(const struct acpi_table_fadt *fadt) +{ +#define TB_COPY_GAS(tbg, g) \ + tbg.space_id = g.space_id; \ + tbg.bit_width = g.bit_width; \ + tbg.bit_offset = g.bit_offset; \ + tbg.access_width = g.access_width; \ + tbg.address = g.address; + + TB_COPY_GAS(tboot->acpi_sinfo.pm1a_cnt_blk, fadt->xpm1a_control_block); + TB_COPY_GAS(tboot->acpi_sinfo.pm1b_cnt_blk, fadt->xpm1b_control_block); + TB_COPY_GAS(tboot->acpi_sinfo.pm1a_evt_blk, fadt->xpm1a_event_block); + TB_COPY_GAS(tboot->acpi_sinfo.pm1b_evt_blk, fadt->xpm1b_event_block); + + /* + * We need phys addr of waking vector, but can't use virt_to_phys() on + * &acpi_gbl_FACS because it is ioremap'ed, so calc from FACS phys + * addr. + */ + tboot->acpi_sinfo.wakeup_vector = fadt->facs + + offsetof(struct acpi_table_facs, firmware_waking_vector); +} + +void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control) +{ + static u32 acpi_shutdown_map[ACPI_S_STATE_COUNT] = { + /* S0,1,2: */ -1, -1, -1, + /* S3: */ TB_SHUTDOWN_S3, + /* S4: */ TB_SHUTDOWN_S4, + /* S5: */ TB_SHUTDOWN_S5 }; + + if (!tboot_enabled()) + return; + + tboot_copy_fadt(&acpi_gbl_FADT); + tboot->acpi_sinfo.pm1a_cnt_val = pm1a_control; + tboot->acpi_sinfo.pm1b_cnt_val = pm1b_control; + /* we always use the 32b wakeup vector */ + tboot->acpi_sinfo.vector_width = 32; + tboot->acpi_sinfo.kernel_s3_resume_vector = acpi_wakeup_address; + + if (sleep_state >= ACPI_S_STATE_COUNT || + acpi_shutdown_map[sleep_state] == -1) { + pr_warning("unsupported sleep state 0x%x\n", sleep_state); + return; + } + + tboot_shutdown(acpi_shutdown_map[sleep_state]); +} + +int tboot_wait_for_aps(int num_aps) +{ + unsigned long timeout; + + if (!tboot_enabled()) + return 0; + + timeout = jiffies + AP_WAIT_TIMEOUT*HZ; + while (atomic_read((atomic_t *)&tboot->num_in_wfs) != num_aps && + time_before(jiffies, timeout)) + cpu_relax(); + + return time_before(jiffies, timeout) ? 0 : 1; +} + +/* + * TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_BASE) + */ + +#define TXT_PUB_CONFIG_REGS_BASE 0xfed30000 +#define TXT_PRIV_CONFIG_REGS_BASE 0xfed20000 + +/* # pages for each config regs space - used by fixmap */ +#define NR_TXT_CONFIG_PAGES ((TXT_PUB_CONFIG_REGS_BASE - \ + TXT_PRIV_CONFIG_REGS_BASE) >> PAGE_SHIFT) + +/* offsets from pub/priv config space */ +#define TXTCR_HEAP_BASE 0x0300 +#define TXTCR_HEAP_SIZE 0x0308 + +#define SHA1_SIZE 20 + +struct sha1_hash { + u8 hash[SHA1_SIZE]; +}; + +struct sinit_mle_data { + u32 version; /* currently 6 */ + struct sha1_hash bios_acm_id; + u32 edx_senter_flags; + u64 mseg_valid; + struct sha1_hash sinit_hash; + struct sha1_hash mle_hash; + struct sha1_hash stm_hash; + struct sha1_hash lcp_policy_hash; + u32 lcp_policy_control; + u32 rlp_wakeup_addr; + u32 reserved; + u32 num_mdrs; + u32 mdrs_off; + u32 num_vtd_dmars; + u32 vtd_dmars_off; +} __packed; + +struct acpi_table_header *tboot_get_dmar_table(struct acpi_table_header *dmar_tbl) +{ + void *heap_base, *heap_ptr, *config; + + if (!tboot_enabled()) + return dmar_tbl; + + /* + * ACPI tables may not be DMA protected by tboot, so use DMAR copy + * SINIT saved in SinitMleData in TXT heap (which is DMA protected) + */ + + /* map config space in order to get heap addr */ + config = ioremap(TXT_PUB_CONFIG_REGS_BASE, NR_TXT_CONFIG_PAGES * + PAGE_SIZE); + if (!config) + return NULL; + + /* now map TXT heap */ + heap_base = ioremap(*(u64 *)(config + TXTCR_HEAP_BASE), + *(u64 *)(config + TXTCR_HEAP_SIZE)); + iounmap(config); + if (!heap_base) + return NULL; + + /* walk heap to SinitMleData */ + /* skip BiosData */ + heap_ptr = heap_base + *(u64 *)heap_base; + /* skip OsMleData */ + heap_ptr += *(u64 *)heap_ptr; + /* skip OsSinitData */ + heap_ptr += *(u64 *)heap_ptr; + /* now points to SinitMleDataSize; set to SinitMleData */ + heap_ptr += sizeof(u64); + /* get addr of DMAR table */ + dmar_tbl = (struct acpi_table_header *)(heap_ptr + + ((struct sinit_mle_data *)heap_ptr)->vtd_dmars_off - + sizeof(u64)); + + /* don't unmap heap because dmar.c needs access to this */ + + return dmar_tbl; +} + +int tboot_force_iommu(void) +{ + if (!tboot_enabled()) + return 0; + + if (no_iommu || swiotlb || dmar_disabled) + pr_warning("Forcing Intel-IOMMU to enabled\n"); + + dmar_disabled = 0; +#ifdef CONFIG_SWIOTLB + swiotlb = 0; +#endif + no_iommu = 0; + + return 1; +} -- cgit v1.2.3-18-g5258 From 840c2baf2d4cdf35ecc3b7fcbba7740f97de30a4 Mon Sep 17 00:00:00 2001 From: Joseph Cihula Date: Tue, 30 Jun 2009 19:31:02 -0700 Subject: x86, intel_txt: Intel TXT reboot/halt shutdown support Support for graceful handling of kernel reboots after an Intel(R) TXT launch. Without this patch, attempting to reboot or halt the system will cause the TXT hardware to lock memory upon system restart because the secrets-in-memory flag that was set on launch was never cleared. This will in turn cause BIOS to execute a TXT Authenticated Code Module (ACM) that will scrub all of memory and then unlock it. Depending on the amount of memory in the system and its type, this may take some time. This patch creates a 1:1 address mapping to the tboot module and then calls back into tboot so that it may properly and securely clean up system state and clear the secrets-in-memory flag. When it has completed these steps, the tboot module will reboot or halt the system. arch/x86/kernel/reboot.c | 8 ++++++++ init/main.c | 3 +++ 2 files changed, 11 insertions(+) Signed-off-by: Joseph Cihula Signed-off-by: Shane Wang Signed-off-by: H. Peter Anvin --- arch/x86/kernel/reboot.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'arch') diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c index d2d1ce8170f..9de01c5d979 100644 --- a/arch/x86/kernel/reboot.c +++ b/arch/x86/kernel/reboot.c @@ -24,6 +24,8 @@ # include #endif +#include + /* * Power off function, if any */ @@ -460,6 +462,8 @@ static void native_machine_emergency_restart(void) if (reboot_emergency) emergency_vmx_disable_all(); + tboot_shutdown(TB_SHUTDOWN_REBOOT); + /* Tell the BIOS if we want cold or warm reboot */ *((unsigned short *)__va(0x472)) = reboot_mode; @@ -586,6 +590,8 @@ static void native_machine_halt(void) /* stop other cpus and apics */ machine_shutdown(); + tboot_shutdown(TB_SHUTDOWN_HALT); + /* stop this cpu */ stop_this_cpu(NULL); } @@ -597,6 +603,8 @@ static void native_machine_power_off(void) machine_shutdown(); pm_power_off(); } + /* a fallback in case there is no PM info available */ + tboot_shutdown(TB_SHUTDOWN_HALT); } struct machine_ops machine_ops = { -- cgit v1.2.3-18-g5258 From 86886e55b273f565935491816c7c96b82469d4f8 Mon Sep 17 00:00:00 2001 From: Joseph Cihula Date: Tue, 30 Jun 2009 19:31:07 -0700 Subject: x86, intel_txt: Intel TXT Sx shutdown support Support for graceful handling of sleep states (S3/S4/S5) after an Intel(R) TXT launch. Without this patch, attempting to place the system in one of the ACPI sleep states (S3/S4/S5) will cause the TXT hardware to treat this as an attack and will cause a system reset, with memory locked. Not only may the subsequent memory scrub take some time, but the platform will be unable to enter the requested power state. This patch calls back into the tboot so that it may properly and securely clean up system state and clear the secrets-in-memory flag, after which it will place the system into the requested sleep state using ACPI information passed by the kernel. arch/x86/kernel/smpboot.c | 2 ++ drivers/acpi/acpica/hwsleep.c | 3 +++ kernel/cpu.c | 7 ++++++- 3 files changed, 11 insertions(+), 1 deletion(-) Signed-off-by: Joseph Cihula Signed-off-by: Shane Wang Signed-off-by: H. Peter Anvin --- arch/x86/kernel/smpboot.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch') diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 2fecda69ee6..61cc40887c4 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -62,6 +62,7 @@ #include #include #include +#include #include #include @@ -1317,6 +1318,7 @@ void play_dead_common(void) void native_play_dead(void) { play_dead_common(); + tboot_shutdown(TB_SHUTDOWN_WFS); wbinvd_halt(); } -- cgit v1.2.3-18-g5258 From 81e2d7b30d718824434725a4a24d5864a71b1d30 Mon Sep 17 00:00:00 2001 From: "H. Peter Anvin" Date: Wed, 12 Aug 2009 05:45:34 -0700 Subject: x86, intel_txt: tboot.c needs arch/x86/kernel/tboot.c needs . In most configurations that ends up getting implicitly included, but not in all, causing build failures in some configurations. Reported-by: Ingo Molnar Signed-off-by: H. Peter Anvin Cc: Joseph Cihula Cc: Shane Wang --- arch/x86/kernel/tboot.c | 1 + 1 file changed, 1 insertion(+) (limited to 'arch') diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c index 263591afd29..1ab80120894 100644 --- a/arch/x86/kernel/tboot.c +++ b/arch/x86/kernel/tboot.c @@ -33,6 +33,7 @@ #include #include #include +#include #include #include #include -- cgit v1.2.3-18-g5258 From 58c41d28259c246dbc11358d85d332dc20ccd57b Mon Sep 17 00:00:00 2001 From: "H. Peter Anvin" Date: Fri, 14 Aug 2009 12:14:19 -0700 Subject: x86, intel_txt: Factor out the code for S3 setup S3 sleep requires special setup in tboot. However, the data structures needed to do such setup are only available if CONFIG_ACPI_SLEEP is enabled. Abstract them out as much as possible, so we can have a single tboot_setup_sleep() which either is a proper implementation or a stub which simply calls BUG(). Signed-off-by: H. Peter Anvin Acked-by: Shane Wang Cc: Joseph Cihula --- arch/x86/kernel/tboot.c | 53 +++++++++++++++++++++++++++++++++++++------------ 1 file changed, 40 insertions(+), 13 deletions(-) (limited to 'arch') diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c index 1ab80120894..a183beffe39 100644 --- a/arch/x86/kernel/tboot.c +++ b/arch/x86/kernel/tboot.c @@ -34,6 +34,7 @@ #include #include #include +#include #include #include #include @@ -164,25 +165,51 @@ void tboot_create_trampoline(void) map_base = PFN_DOWN(tboot->tboot_base); map_size = PFN_UP(tboot->tboot_size); if (map_tboot_pages(map_base << PAGE_SHIFT, map_base, map_size)) - panic("tboot: Error mapping tboot pages (mfns) @ 0x%x, 0x%x\n", map_base, map_size); + panic("tboot: Error mapping tboot pages (mfns) @ 0x%x, 0x%x\n", + map_base, map_size); } -static void set_mac_regions(void) +#ifdef CONFIG_ACPI_SLEEP + +static void add_mac_region(phys_addr_t start, unsigned long size) { - tboot->num_mac_regions = 3; + struct tboot_mac_region *mr; + phys_addr_t end = start + size; + + if (start && size) { + mr = &tboot->mac_regions[tboot->num_mac_regions++]; + mr->start = round_down(start, PAGE_SIZE); + mr->size = round_up(end, PAGE_SIZE) - mr->start; + } +} + +static int tboot_setup_sleep(void) +{ + tboot->num_mac_regions = 0; + /* S3 resume code */ - tboot->mac_regions[0].start = PFN_PHYS(PFN_DOWN(acpi_wakeup_address)); - tboot->mac_regions[0].size = PFN_UP(WAKEUP_SIZE) << PAGE_SHIFT; + add_mac_region(acpi_wakeup_address, WAKEUP_SIZE); /* AP trampoline code */ - tboot->mac_regions[1].start = - PFN_PHYS(PFN_DOWN(virt_to_phys(trampoline_base))); - tboot->mac_regions[1].size = PFN_UP(TRAMPOLINE_SIZE) << PAGE_SHIFT; + add_mac_region(virt_to_phys(trampoline_base), TRAMPOLINE_SIZE); /* kernel code + data + bss */ - tboot->mac_regions[2].start = PFN_PHYS(PFN_DOWN(virt_to_phys(&_text))); - tboot->mac_regions[2].size = PFN_PHYS(PFN_UP(virt_to_phys(&_end))) - - PFN_PHYS(PFN_DOWN(virt_to_phys(&_text))); + add_mac_region(virt_to_phys(_text), _end - _text); + + tboot->acpi_sinfo.kernel_s3_resume_vector = acpi_wakeup_address; + + return 0; } +#else /* no CONFIG_ACPI_SLEEP */ + +static int tboot_setup_sleep(void) +{ + /* S3 shutdown requested, but S3 not supported by the kernel... */ + BUG(); + return -1; +} + +#endif + void tboot_shutdown(u32 shutdown_type) { void (*shutdown)(void); @@ -200,7 +227,8 @@ void tboot_shutdown(u32 shutdown_type) /* if this is S3 then set regions to MAC */ if (shutdown_type == TB_SHUTDOWN_S3) - set_mac_regions(); + if (tboot_setup_sleep()) + return; tboot->shutdown_type = shutdown_type; @@ -253,7 +281,6 @@ void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control) tboot->acpi_sinfo.pm1b_cnt_val = pm1b_control; /* we always use the 32b wakeup vector */ tboot->acpi_sinfo.vector_width = 32; - tboot->acpi_sinfo.kernel_s3_resume_vector = acpi_wakeup_address; if (sleep_state >= ACPI_S_STATE_COUNT || acpi_shutdown_map[sleep_state] == -1) { -- cgit v1.2.3-18-g5258 From 62a3207b8cf3de35368cdc3822b30b82d59eea95 Mon Sep 17 00:00:00 2001 From: "H. Peter Anvin" Date: Mon, 17 Aug 2009 11:16:16 -0700 Subject: x86, intel_txt: Handle ACPI_SLEEP without X86_TRAMPOLINE On 32 bits, we can have CONFIG_ACPI_SLEEP set without implying CONFIG_X86_TRAMPOLINE. In that case, we simply do not need to mark the trampoline as a MAC region. Signed-off-by: H. Peter Anvin Cc: Shane Wang Cc: Joseph Cihula --- arch/x86/kernel/tboot.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch') diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c index a183beffe39..c2e760ca7b0 100644 --- a/arch/x86/kernel/tboot.c +++ b/arch/x86/kernel/tboot.c @@ -189,8 +189,12 @@ static int tboot_setup_sleep(void) /* S3 resume code */ add_mac_region(acpi_wakeup_address, WAKEUP_SIZE); + +#ifdef CONFIG_X86_TRAMPOLINE /* AP trampoline code */ add_mac_region(virt_to_phys(trampoline_base), TRAMPOLINE_SIZE); +#endif + /* kernel code + data + bss */ add_mac_region(virt_to_phys(_text), _end - _text); -- cgit v1.2.3-18-g5258 From 69575d388603365f2afbf4166df93152df59b165 Mon Sep 17 00:00:00 2001 From: Shane Wang Date: Tue, 1 Sep 2009 18:25:07 -0700 Subject: x86, intel_txt: clean up the impact on generic code, unbreak non-x86 Move tboot.h from asm to linux to fix the build errors of intel_txt patch on non-X86 platforms. Remove the tboot code from generic code init/main.c and kernel/cpu.c. Signed-off-by: Shane Wang Signed-off-by: H. Peter Anvin --- arch/x86/Kconfig | 4 + arch/x86/include/asm/tboot.h | 197 ------------------------------------------- arch/x86/kernel/reboot.c | 3 +- arch/x86/kernel/setup.c | 3 +- arch/x86/kernel/smpboot.c | 2 +- arch/x86/kernel/tboot.c | 58 ++++++++++--- 6 files changed, 54 insertions(+), 213 deletions(-) delete mode 100644 arch/x86/include/asm/tboot.h (limited to 'arch') diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 738bdc6b0f8..b66f2102c35 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -178,6 +178,10 @@ config ARCH_SUPPORTS_OPTIMIZED_INLINING config ARCH_SUPPORTS_DEBUG_PAGEALLOC def_bool y +config HAVE_INTEL_TXT + def_bool y + depends on EXPERIMENTAL && DMAR && ACPI + # Use the generic interrupt handling code in kernel/irq/: config GENERIC_HARDIRQS bool diff --git a/arch/x86/include/asm/tboot.h b/arch/x86/include/asm/tboot.h deleted file mode 100644 index b13929d4e5f..00000000000 --- a/arch/x86/include/asm/tboot.h +++ /dev/null @@ -1,197 +0,0 @@ -/* - * tboot.h: shared data structure with tboot and kernel and functions - * used by kernel for runtime support of Intel(R) Trusted - * Execution Technology - * - * Copyright (c) 2006-2009, Intel Corporation - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. - * - */ - -#ifndef _ASM_TBOOT_H -#define _ASM_TBOOT_H - -#include - -/* these must have the values from 0-5 in this order */ -enum { - TB_SHUTDOWN_REBOOT = 0, - TB_SHUTDOWN_S5, - TB_SHUTDOWN_S4, - TB_SHUTDOWN_S3, - TB_SHUTDOWN_HALT, - TB_SHUTDOWN_WFS -}; - -#ifdef CONFIG_INTEL_TXT - -/* used to communicate between tboot and the launched kernel */ - -#define TB_KEY_SIZE 64 /* 512 bits */ - -#define MAX_TB_MAC_REGIONS 32 - -struct tboot_mac_region { - u64 start; /* must be 64 byte -aligned */ - u32 size; /* must be 64 byte -granular */ -} __packed; - -/* GAS - Generic Address Structure (ACPI 2.0+) */ -struct tboot_acpi_generic_address { - u8 space_id; - u8 bit_width; - u8 bit_offset; - u8 access_width; - u64 address; -} __packed; - -/* - * combines Sx info from FADT and FACS tables per ACPI 2.0+ spec - * (http://www.acpi.info/) - */ -struct tboot_acpi_sleep_info { - struct tboot_acpi_generic_address pm1a_cnt_blk; - struct tboot_acpi_generic_address pm1b_cnt_blk; - struct tboot_acpi_generic_address pm1a_evt_blk; - struct tboot_acpi_generic_address pm1b_evt_blk; - u16 pm1a_cnt_val; - u16 pm1b_cnt_val; - u64 wakeup_vector; - u32 vector_width; - u64 kernel_s3_resume_vector; -} __packed; - -/* - * shared memory page used for communication between tboot and kernel - */ -struct tboot { - /* - * version 3+ fields: - */ - - /* TBOOT_UUID */ - u8 uuid[16]; - - /* version number: 5 is current */ - u32 version; - - /* physical addr of tb_log_t log */ - u32 log_addr; - - /* - * physical addr of entry point for tboot shutdown and - * type of shutdown (TB_SHUTDOWN_*) being requested - */ - u32 shutdown_entry; - u32 shutdown_type; - - /* kernel-specified ACPI info for Sx shutdown */ - struct tboot_acpi_sleep_info acpi_sinfo; - - /* tboot location in memory (physical) */ - u32 tboot_base; - u32 tboot_size; - - /* memory regions (phys addrs) for tboot to MAC on S3 */ - u8 num_mac_regions; - struct tboot_mac_region mac_regions[MAX_TB_MAC_REGIONS]; - - - /* - * version 4+ fields: - */ - - /* symmetric key for use by kernel; will be encrypted on S3 */ - u8 s3_key[TB_KEY_SIZE]; - - - /* - * version 5+ fields: - */ - - /* used to 4byte-align num_in_wfs */ - u8 reserved_align[3]; - - /* number of processors in wait-for-SIPI */ - u32 num_in_wfs; -} __packed; - -/* - * UUID for tboot data struct to facilitate matching - * defined as {663C8DFF-E8B3-4b82-AABF-19EA4D057A08} by tboot, which is - * represented as {} in the char array used here - */ -#define TBOOT_UUID {0xff, 0x8d, 0x3c, 0x66, 0xb3, 0xe8, 0x82, 0x4b, 0xbf,\ - 0xaa, 0x19, 0xea, 0x4d, 0x5, 0x7a, 0x8} - -extern struct tboot *tboot; - -static inline int tboot_enabled(void) -{ - return tboot != NULL; -} - -extern void tboot_probe(void); -extern void tboot_create_trampoline(void); -extern void tboot_shutdown(u32 shutdown_type); -extern void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control); -extern int tboot_wait_for_aps(int num_aps); -extern struct acpi_table_header *tboot_get_dmar_table( - struct acpi_table_header *dmar_tbl); -extern int tboot_force_iommu(void); - -#else /* CONFIG_INTEL_TXT */ - -static inline int tboot_enabled(void) -{ - return 0; -} - -static inline void tboot_probe(void) -{ -} - -static inline void tboot_create_trampoline(void) -{ -} - -static inline void tboot_shutdown(u32 shutdown_type) -{ -} - -static inline void tboot_sleep(u8 sleep_state, u32 pm1a_control, - u32 pm1b_control) -{ -} - -static inline int tboot_wait_for_aps(int num_aps) -{ - return 0; -} - -static inline struct acpi_table_header *tboot_get_dmar_table( - struct acpi_table_header *dmar_tbl) -{ - return dmar_tbl; -} - -static inline int tboot_force_iommu(void) -{ - return 0; -} - -#endif /* !CONFIG_INTEL_TXT */ - -#endif /* _ASM_TBOOT_H */ diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c index 9de01c5d979..18ce5c04242 100644 --- a/arch/x86/kernel/reboot.c +++ b/arch/x86/kernel/reboot.c @@ -3,6 +3,7 @@ #include #include #include +#include #include #include #include @@ -24,8 +25,6 @@ # include #endif -#include - /* * Power off function, if any */ diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 80d6e9e3248..6ce0d6f38f7 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -66,6 +66,7 @@ #include #include +#include #include