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Merge branch 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse Source 
Pull EFI updates from Ingo Molnar:
 "The main changes in this cycle were:

   - Rework the EFI capsule loader to allow for workarounds for
     non-compliant firmware (Ard Biesheuvel)

   - Implement a capsule loader quirk for Quark X102x (Jan Kiszka)

   - Enable SMBIOS/DMI support for the ARM architecture (Ard Biesheuvel)

   - Add CONFIG_EFI_PGT_DUMP=y support for x86-32 and kexec (Sai
     Praneeth)

   - Fixes for EFI support for Xen dom0 guests running under x86-64
     hosts (Daniel Kiper)"

* 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/xen/efi: Initialize only the EFI struct members used by Xen
  efi: Process the MEMATTR table only if EFI_MEMMAP is enabled
  efi/arm: Enable DMI/SMBIOS
  x86/efi: Extend CONFIG_EFI_PGT_DUMP support to x86_32 and kexec as well
  efi/efi_test: Use memdup_user() helper
  efi/capsule: Add support for Quark security header
  efi/capsule-loader: Use page addresses rather than struct page pointers
  efi/capsule-loader: Redirect calls to efi_capsule_setup_info() via weak alias
  efi/capsule: Remove NULL test on kmap()
  efi/capsule-loader: Use a cached copy of the capsule header
  efi/capsule: Adjust return type of efi_capsule_setup_info()
  efi/capsule: Clean up pr_err/_info() messages
  efi/capsule: Remove pr_debug() on ENOMEM or EFAULT
  efi/capsule: Fix return code on failing kmap/vmap
This commit is contained in:
Linus Torvalds 2017-07-03 12:12:05 -07:00
commit 162b246eb4
15 changed files with 306 additions and 147 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
arch/arm/Kconfig
View File

@ -2062,6 +2062,23 @@ config EFI
is only useful for kernels that may run on systems that have
UEFI firmware.
config DMI
bool "Enable support for SMBIOS (DMI) tables"
depends on EFI
default y
help
This enables SMBIOS/DMI feature for systems.
This option is only useful on systems that have UEFI firmware.
However, even with this option, the resultant kernel should
continue to boot on existing non-UEFI platforms.
NOTE: This does *NOT* enable or encourage the use of DMI quirks,
i.e., the the practice of identifying the platform via DMI to
decide whether certain workarounds for buggy hardware and/or
firmware need to be enabled. This would require the DMI subsystem
to be enabled much earlier than we do on ARM, which is non-trivial.
endmenu
menu "CPU Power Management"

19
arch/arm/include/asm/dmi.h Normal file
View File

@ -0,0 +1,19 @@
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __ASM_DMI_H
#define __ASM_DMI_H
#include <linux/io.h>
#include <linux/slab.h>
#define dmi_early_remap(x, l) memremap(x, l, MEMREMAP_WB)
#define dmi_early_unmap(x, l) memunmap(x)
#define dmi_remap(x, l) memremap(x, l, MEMREMAP_WB)
#define dmi_unmap(x) memunmap(x)
#define dmi_alloc(l) kzalloc(l, GFP_KERNEL)
#endif

15
arch/arm64/kernel/efi.c
View File

@ -11,7 +11,6 @@
*
*/
#include <linux/dmi.h>
#include <linux/efi.h>
#include <linux/init.h>
@ -117,20 +116,6 @@ int __init efi_set_mapping_permissions(struct mm_struct *mm,
set_permissions, md);
}
static int __init arm64_dmi_init(void)
{
/*
* On arm64, DMI depends on UEFI, and dmi_scan_machine() needs to
* be called early because dmi_id_init(), which is an arch_initcall
* itself, depends on dmi_scan_machine() having been called already.
*/
dmi_scan_machine();
if (dmi_available)
dmi_set_dump_stack_arch_desc();
return 0;
}
core_initcall(arm64_dmi_init);
/*
* UpdateCapsule() depends on the system being shutdown via
* ResetSystem().

3
arch/x86/platform/efi/efi.c
View File

@ -1014,7 +1014,6 @@ static void __init __efi_enter_virtual_mode(void)
* necessary relocation fixups for the new virtual addresses.
*/
efi_runtime_update_mappings();
efi_dump_pagetable();
/* clean DUMMY object */
efi_delete_dummy_variable();
@ -1029,6 +1028,8 @@ void __init efi_enter_virtual_mode(void)
kexec_enter_virtual_mode();
else
__efi_enter_virtual_mode();
efi_dump_pagetable();
}
/*

9
arch/x86/platform/efi/efi_32.c
View File

@ -44,7 +44,14 @@ int __init efi_alloc_page_tables(void)
}
void efi_sync_low_kernel_mappings(void) {}
void __init efi_dump_pagetable(void) {}
void __init efi_dump_pagetable(void)
{
#ifdef CONFIG_EFI_PGT_DUMP
ptdump_walk_pgd_level(NULL, swapper_pg_dir);
#endif
}
int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
{
return 0;

5
arch/x86/platform/efi/efi_64.c
View File

@ -589,7 +589,10 @@ void __init efi_runtime_update_mappings(void)
void __init efi_dump_pagetable(void)
{
#ifdef CONFIG_EFI_PGT_DUMP
ptdump_walk_pgd_level(NULL, efi_pgd);
if (efi_enabled(EFI_OLD_MEMMAP))
ptdump_walk_pgd_level(NULL, swapper_pg_dir);
else
ptdump_walk_pgd_level(NULL, efi_pgd);
#endif
}

137
arch/x86/platform/efi/quirks.c
View File

@ -15,12 +15,66 @@
#include <asm/e820/api.h>
#include <asm/efi.h>
#include <asm/uv/uv.h>
#include <asm/cpu_device_id.h>
#define EFI_MIN_RESERVE 5120
#define EFI_DUMMY_GUID \
EFI_GUID(0x4424ac57, 0xbe4b, 0x47dd, 0x9e, 0x97, 0xed, 0x50, 0xf0, 0x9f, 0x92, 0xa9)
#define QUARK_CSH_SIGNATURE 0x5f435348 /* _CSH */
#define QUARK_SECURITY_HEADER_SIZE 0x400
/*
* Header prepended to the standard EFI capsule on Quark systems the are based
* on Intel firmware BSP.
* @csh_signature: Unique identifier to sanity check signed module
* presence ("_CSH").
* @version: Current version of CSH used. Should be one for Quark A0.
* @modulesize: Size of the entire module including the module header
* and payload.
* @security_version_number_index: Index of SVN to use for validation of signed
* module.
* @security_version_number: Used to prevent against roll back of modules.
* @rsvd_module_id: Currently unused for Clanton (Quark).
* @rsvd_module_vendor: Vendor Identifier. For Intel products value is
* 0x00008086.
* @rsvd_date: BCD representation of build date as yyyymmdd, where
* yyyy=4 digit year, mm=1-12, dd=1-31.
* @headersize: Total length of the header including including any
* padding optionally added by the signing tool.
* @hash_algo: What Hash is used in the module signing.
* @cryp_algo: What Crypto is used in the module signing.
* @keysize: Total length of the key data including including any
* padding optionally added by the signing tool.
* @signaturesize: Total length of the signature including including any
* padding optionally added by the signing tool.
* @rsvd_next_header: 32-bit pointer to the next Secure Boot Module in the
* chain, if there is a next header.
* @rsvd: Reserved, padding structure to required size.
*
* See also QuartSecurityHeader_t in
* Quark_EDKII_v1.2.1.1/QuarkPlatformPkg/Include/QuarkBootRom.h
* from https://downloadcenter.intel.com/download/23197/Intel-Quark-SoC-X1000-Board-Support-Package-BSP
*/
struct quark_security_header {
u32 csh_signature;
u32 version;
u32 modulesize;
u32 security_version_number_index;
u32 security_version_number;
u32 rsvd_module_id;
u32 rsvd_module_vendor;
u32 rsvd_date;
u32 headersize;
u32 hash_algo;
u32 cryp_algo;
u32 keysize;
u32 signaturesize;
u32 rsvd_next_header;
u32 rsvd[2];
};
static efi_char16_t efi_dummy_name[6] = { 'D', 'U', 'M', 'M', 'Y', 0 };
static bool efi_no_storage_paranoia;
@ -504,3 +558,86 @@ bool efi_poweroff_required(void)
{
return acpi_gbl_reduced_hardware || acpi_no_s5;
}
#ifdef CONFIG_EFI_CAPSULE_QUIRK_QUARK_CSH
static int qrk_capsule_setup_info(struct capsule_info *cap_info, void **pkbuff,
size_t hdr_bytes)
{
struct quark_security_header *csh = *pkbuff;
/* Only process data block that is larger than the security header */
if (hdr_bytes < sizeof(struct quark_security_header))
return 0;
if (csh->csh_signature != QUARK_CSH_SIGNATURE ||
csh->headersize != QUARK_SECURITY_HEADER_SIZE)
return 1;
/* Only process data block if EFI header is included */
if (hdr_bytes < QUARK_SECURITY_HEADER_SIZE +
sizeof(efi_capsule_header_t))
return 0;
pr_debug("Quark security header detected\n");
if (csh->rsvd_next_header != 0) {
pr_err("multiple Quark security headers not supported\n");
return -EINVAL;
}
*pkbuff += csh->headersize;
cap_info->total_size = csh->headersize;
/*
* Update the first page pointer to skip over the CSH header.
*/
cap_info->pages[0] += csh->headersize;
return 1;
}
#define ICPU(family, model, quirk_handler) \
{ X86_VENDOR_INTEL, family, model, X86_FEATURE_ANY, \
(unsigned long)&quirk_handler }
static const struct x86_cpu_id efi_capsule_quirk_ids[] = {
ICPU(5, 9, qrk_capsule_setup_info), /* Intel Quark X1000 */
{ }
};
int efi_capsule_setup_info(struct capsule_info *cap_info, void *kbuff,
size_t hdr_bytes)
{
int (*quirk_handler)(struct capsule_info *, void **, size_t);
const struct x86_cpu_id *id;
int ret;
if (hdr_bytes < sizeof(efi_capsule_header_t))
return 0;
cap_info->total_size = 0;
id = x86_match_cpu(efi_capsule_quirk_ids);
if (id) {
/*
* The quirk handler is supposed to return
* - a value > 0 if the setup should continue, after advancing
* kbuff as needed
* - 0 if not enough hdr_bytes are available yet
* - a negative error code otherwise
*/
quirk_handler = (typeof(quirk_handler))id->driver_data;
ret = quirk_handler(cap_info, &kbuff, hdr_bytes);
if (ret <= 0)
return ret;
}
memcpy(&cap_info->header, kbuff, sizeof(cap_info->header));
cap_info->total_size += cap_info->header.imagesize;
return __efi_capsule_setup_info(cap_info);
}
#endif

45
arch/x86/xen/efi.c
View File

@ -54,38 +54,6 @@ static efi_system_table_t efi_systab_xen __initdata = {
.tables = EFI_INVALID_TABLE_ADDR /* Initialized later. */
};
static const struct efi efi_xen __initconst = {
.systab = NULL, /* Initialized later. */
.runtime_version = 0, /* Initialized later. */
.mps = EFI_INVALID_TABLE_ADDR,
.acpi = EFI_INVALID_TABLE_ADDR,
.acpi20 = EFI_INVALID_TABLE_ADDR,
.smbios = EFI_INVALID_TABLE_ADDR,
.smbios3 = EFI_INVALID_TABLE_ADDR,
.sal_systab = EFI_INVALID_TABLE_ADDR,
.boot_info = EFI_INVALID_TABLE_ADDR,
.hcdp = EFI_INVALID_TABLE_ADDR,
.uga = EFI_INVALID_TABLE_ADDR,
.uv_systab = EFI_INVALID_TABLE_ADDR,
.fw_vendor = EFI_INVALID_TABLE_ADDR,
.runtime = EFI_INVALID_TABLE_ADDR,
.config_table = EFI_INVALID_TABLE_ADDR,
.get_time = xen_efi_get_time,
.set_time = xen_efi_set_time,
.get_wakeup_time = xen_efi_get_wakeup_time,
.set_wakeup_time = xen_efi_set_wakeup_time,
.get_variable = xen_efi_get_variable,
.get_next_variable = xen_efi_get_next_variable,
.set_variable = xen_efi_set_variable,
.query_variable_info = xen_efi_query_variable_info,
.update_capsule = xen_efi_update_capsule,
.query_capsule_caps = xen_efi_query_capsule_caps,
.get_next_high_mono_count = xen_efi_get_next_high_mono_count,
.reset_system = xen_efi_reset_system,
.set_virtual_address_map = NULL, /* Not used under Xen. */
.flags = 0 /* Initialized later. */
};
static efi_system_table_t __init *xen_efi_probe(void)
{
struct xen_platform_op op = {
@ -102,7 +70,18 @@ static efi_system_table_t __init *xen_efi_probe(void)
/* Here we know that Xen runs on EFI platform. */
efi = efi_xen;
efi.get_time = xen_efi_get_time;
efi.set_time = xen_efi_set_time;
efi.get_wakeup_time = xen_efi_get_wakeup_time;
efi.set_wakeup_time = xen_efi_set_wakeup_time;
efi.get_variable = xen_efi_get_variable;
efi.get_next_variable = xen_efi_get_next_variable;
efi.set_variable = xen_efi_set_variable;
efi.query_variable_info = xen_efi_query_variable_info;
efi.update_capsule = xen_efi_update_capsule;
efi.query_capsule_caps = xen_efi_query_capsule_caps;
efi.get_next_high_mono_count = xen_efi_get_next_high_mono_count;
efi.reset_system = xen_efi_reset_system;
efi_systab_xen.tables = info->cfg.addr;
efi_systab_xen.nr_tables = info->cfg.nent;

9
drivers/firmware/efi/Kconfig
View File

@ -112,6 +112,15 @@ config EFI_CAPSULE_LOADER
Most users should say N.
config EFI_CAPSULE_QUIRK_QUARK_CSH
boolean "Add support for Quark capsules with non-standard headers"
depends on X86 && !64BIT
select EFI_CAPSULE_LOADER
default y
help
Add support for processing Quark X1000 EFI capsules, whose header
layout deviates from the layout mandated by the UEFI specification.
config EFI_TEST
tristate "EFI Runtime Service Tests Support"
depends on EFI

16
drivers/firmware/efi/arm-runtime.c
View File

@ -11,6 +11,7 @@
*
*/
#include <linux/dmi.h>
#include <linux/efi.h>
#include <linux/io.h>
#include <linux/memblock.h>
@ -166,3 +167,18 @@ void efi_virtmap_unload(void)
efi_set_pgd(current->active_mm);
preempt_enable();
}
static int __init arm_dmi_init(void)
{
/*
* On arm64/ARM, DMI depends on UEFI, and dmi_scan_machine() needs to
* be called early because dmi_id_init(), which is an arch_initcall
* itself, depends on dmi_scan_machine() having been called already.
*/
dmi_scan_machine();
if (dmi_available)
dmi_set_dump_stack_arch_desc();
return 0;
}
core_initcall(arm_dmi_init);

139
drivers/firmware/efi/capsule-loader.c
View File

@ -20,15 +20,9 @@
#define NO_FURTHER_WRITE_ACTION -1
struct capsule_info {
bool header_obtained;
int reset_type;
long index;
size_t count;
size_t total_size;
struct page **pages;
size_t page_bytes_remain;
};
#ifndef phys_to_page
#define phys_to_page(x) pfn_to_page((x) >> PAGE_SHIFT)
#endif
/**
* efi_free_all_buff_pages - free all previous allocated buffer pages
@ -41,62 +35,67 @@ struct capsule_info {
static void efi_free_all_buff_pages(struct capsule_info *cap_info)
{
while (cap_info->index > 0)
__free_page(cap_info->pages[--cap_info->index]);
__free_page(phys_to_page(cap_info->pages[--cap_info->index]));
cap_info->index = NO_FURTHER_WRITE_ACTION;
}
int __efi_capsule_setup_info(struct capsule_info *cap_info)
{
size_t pages_needed;
int ret;
void *temp_page;
pages_needed = ALIGN(cap_info->total_size, PAGE_SIZE) / PAGE_SIZE;
if (pages_needed == 0) {
pr_err("invalid capsule size");
return -EINVAL;
}
/* Check if the capsule binary supported */
ret = efi_capsule_supported(cap_info->header.guid,
cap_info->header.flags,
cap_info->header.imagesize,
&cap_info->reset_type);
if (ret) {
pr_err("capsule not supported\n");
return ret;
}
temp_page = krealloc(cap_info->pages,
pages_needed * sizeof(void *),
GFP_KERNEL | __GFP_ZERO);
if (!temp_page)
return -ENOMEM;
cap_info->pages = temp_page;
return 0;
}
/**
* efi_capsule_setup_info - obtain the efi capsule header in the binary and
* setup capsule_info structure
* @cap_info: pointer to current instance of capsule_info structure
* @kbuff: a mapped first page buffer pointer
* @hdr_bytes: the total received number of bytes for efi header
*
* Platforms with non-standard capsule update mechanisms can override
* this __weak function so they can perform any required capsule
* image munging. See quark_quirk_function() for an example.
**/
static ssize_t efi_capsule_setup_info(struct capsule_info *cap_info,
void *kbuff, size_t hdr_bytes)
int __weak efi_capsule_setup_info(struct capsule_info *cap_info, void *kbuff,
size_t hdr_bytes)
{
efi_capsule_header_t *cap_hdr;
size_t pages_needed;
int ret;
void *temp_page;
/* Only process data block that is larger than efi header size */
if (hdr_bytes < sizeof(efi_capsule_header_t))
return 0;
/* Reset back to the correct offset of header */
cap_hdr = kbuff - cap_info->count;
pages_needed = ALIGN(cap_hdr->imagesize, PAGE_SIZE) >> PAGE_SHIFT;
memcpy(&cap_info->header, kbuff, sizeof(cap_info->header));
cap_info->total_size = cap_info->header.imagesize;
if (pages_needed == 0) {
pr_err("%s: pages count invalid\n", __func__);
return -EINVAL;
}
/* Check if the capsule binary supported */
ret = efi_capsule_supported(cap_hdr->guid, cap_hdr->flags,
cap_hdr->imagesize,
&cap_info->reset_type);
if (ret) {
pr_err("%s: efi_capsule_supported() failed\n",
__func__);
return ret;
}
cap_info->total_size = cap_hdr->imagesize;
temp_page = krealloc(cap_info->pages,
pages_needed * sizeof(void *),
GFP_KERNEL | __GFP_ZERO);
if (!temp_page) {
pr_debug("%s: krealloc() failed\n", __func__);
return -ENOMEM;
}
cap_info->pages = temp_page;
cap_info->header_obtained = true;
return 0;
return __efi_capsule_setup_info(cap_info);
}
/**
@ -107,26 +106,17 @@ static ssize_t efi_capsule_setup_info(struct capsule_info *cap_info,
static ssize_t efi_capsule_submit_update(struct capsule_info *cap_info)
{
int ret;
void *cap_hdr_temp;
cap_hdr_temp = vmap(cap_info->pages, cap_info->index,
VM_MAP, PAGE_KERNEL);
if (!cap_hdr_temp) {
pr_debug("%s: vmap() failed\n", __func__);
return -EFAULT;
}
ret = efi_capsule_update(cap_hdr_temp, cap_info->pages);
vunmap(cap_hdr_temp);
ret = efi_capsule_update(&cap_info->header, cap_info->pages);
if (ret) {
pr_err("%s: efi_capsule_update() failed\n", __func__);
pr_err("capsule update failed\n");
return ret;
}
/* Indicate capsule binary uploading is done */
cap_info->index = NO_FURTHER_WRITE_ACTION;
pr_info("%s: Successfully upload capsule file with reboot type '%s'\n",
__func__, !cap_info->reset_type ? "RESET_COLD" :
pr_info("Successfully upload capsule file with reboot type '%s'\n",
!cap_info->reset_type ? "RESET_COLD" :
cap_info->reset_type == 1 ? "RESET_WARM" :
"RESET_SHUTDOWN");
return 0;
@ -171,37 +161,30 @@ static ssize_t efi_capsule_write(struct file *file, const char __user *buff,
if (!cap_info->page_bytes_remain) {
page = alloc_page(GFP_KERNEL);
if (!page) {
pr_debug("%s: alloc_page() failed\n", __func__);
ret = -ENOMEM;
goto failed;
}
cap_info->pages[cap_info->index++] = page;
cap_info->pages[cap_info->index++] = page_to_phys(page);
cap_info->page_bytes_remain = PAGE_SIZE;
} else {
page = phys_to_page(cap_info->pages[cap_info->index - 1]);
}
page = cap_info->pages[cap_info->index - 1];
kbuff = kmap(page);
if (!kbuff) {
pr_debug("%s: kmap() failed\n", __func__);
ret = -EFAULT;
goto failed;
}
kbuff += PAGE_SIZE - cap_info->page_bytes_remain;
/* Copy capsule binary data from user space to kernel space buffer */
write_byte = min_t(size_t, count, cap_info->page_bytes_remain);
if (copy_from_user(kbuff, buff, write_byte)) {
pr_debug("%s: copy_from_user() failed\n", __func__);
ret = -EFAULT;
goto fail_unmap;
}
cap_info->page_bytes_remain -= write_byte;
/* Setup capsule binary info structure */
if (!cap_info->header_obtained) {
ret = efi_capsule_setup_info(cap_info, kbuff,
if (cap_info->header.headersize == 0) {
ret = efi_capsule_setup_info(cap_info, kbuff - cap_info->count,
cap_info->count + write_byte);
if (ret)
goto fail_unmap;
@ -211,11 +194,10 @@ static ssize_t efi_capsule_write(struct file *file, const char __user *buff,
kunmap(page);
/* Submit the full binary to efi_capsule_update() API */
if (cap_info->header_obtained &&
if (cap_info->header.headersize > 0 &&
cap_info->count >= cap_info->total_size) {
if (cap_info->count > cap_info->total_size) {
pr_err("%s: upload size exceeded header defined size\n",
__func__);
pr_err("capsule upload size exceeded header defined size\n");
ret = -EINVAL;
goto failed;
}
@ -249,7 +231,7 @@ static int efi_capsule_flush(struct file *file, fl_owner_t id)
struct capsule_info *cap_info = file->private_data;
if (cap_info->index > 0) {
pr_err("%s: capsule upload not complete\n", __func__);
pr_err("capsule upload not complete\n");
efi_free_all_buff_pages(cap_info);
ret = -ECANCELED;
}
@ -328,8 +310,7 @@ static int __init efi_capsule_loader_init(void)
ret = misc_register(&efi_capsule_misc);
if (ret)
pr_err("%s: Failed to register misc char file note\n",
__func__);
pr_err("Unable to register capsule loader device\n");
return ret;
}

11
drivers/firmware/efi/capsule.c
View File

@ -214,7 +214,7 @@ efi_capsule_update_locked(efi_capsule_header_t *capsule,
*
* Return 0 on success, a converted EFI status code on failure.
*/
int efi_capsule_update(efi_capsule_header_t *capsule, struct page **pages)
int efi_capsule_update(efi_capsule_header_t *capsule, phys_addr_t *pages)
{
u32 imagesize = capsule->imagesize;
efi_guid_t guid = capsule->guid;
@ -247,16 +247,13 @@ int efi_capsule_update(efi_capsule_header_t *capsule, struct page **pages)
efi_capsule_block_desc_t *sglist;
sglist = kmap(sg_pages[i]);
if (!sglist) {
rv = -ENOMEM;
goto out;
}
for (j = 0; j < SGLIST_PER_PAGE && count > 0; j++) {
u64 sz = min_t(u64, imagesize, PAGE_SIZE);
u64 sz = min_t(u64, imagesize,
PAGE_SIZE - (u64)*pages % PAGE_SIZE);
sglist[j].length = sz;
sglist[j].data = page_to_phys(*pages++);
sglist[j].data = *pages++;
imagesize -= sz;
count--;

3
drivers/firmware/efi/efi.c
View File

@ -528,7 +528,8 @@ int __init efi_config_parse_tables(void *config_tables, int count, int sz,
}
}
efi_memattr_init();
if (efi_enabled(EFI_MEMMAP))
efi_memattr_init();
/* Parse the EFI Properties table if it exists */
if (efi.properties_table != EFI_INVALID_TABLE_ADDR) {

11
drivers/firmware/efi/test/efi_test.c
View File

@ -71,18 +71,13 @@ copy_ucs2_from_user_len(efi_char16_t **dst, efi_char16_t __user *src,
if (!access_ok(VERIFY_READ, src, 1))
return -EFAULT;
buf = kmalloc(len, GFP_KERNEL);
if (!buf) {
buf = memdup_user(src, len);
if (IS_ERR(buf)) {
*dst = NULL;
return -ENOMEM;
return PTR_ERR(buf);
}
*dst = buf;
if (copy_from_user(*dst, src, len)) {
kfree(buf);
return -EFAULT;
}
return 0;
}

14
include/linux/efi.h
View File

@ -137,6 +137,18 @@ struct efi_boot_memmap {
#define EFI_CAPSULE_POPULATE_SYSTEM_TABLE 0x00020000
#define EFI_CAPSULE_INITIATE_RESET 0x00040000
struct capsule_info {
efi_capsule_header_t header;
int reset_type;
long index;
size_t count;
size_t total_size;
phys_addr_t *pages;
size_t page_bytes_remain;
};
int __efi_capsule_setup_info(struct capsule_info *cap_info);
/*
* Allocation types for calls to boottime->allocate_pages.
*/
@ -1403,7 +1415,7 @@ extern int efi_capsule_supported(efi_guid_t guid, u32 flags,
size_t size, int *reset);
extern int efi_capsule_update(efi_capsule_header_t *capsule,
struct page **pages);
phys_addr_t *pages);
#ifdef CONFIG_EFI_RUNTIME_MAP
int efi_runtime_map_init(struct kobject *);