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

Browse Source 
Pull EFI fixes from Ingo Molnar:
 "Various fixes all over the map: prevent boot crashes on HyperV,
  classify UEFI randomness as bootloader randomness, fix EFI boot for
  the Raspberry Pi2, fix efi_test permissions, etc"

* 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  efi/efi_test: Lock down /dev/efi_test and require CAP_SYS_ADMIN
  x86, efi: Never relocate kernel below lowest acceptable address
  efi: libstub/arm: Account for firmware reserved memory at the base of RAM
  efi/random: Treat EFI_RNG_PROTOCOL output as bootloader randomness
  efi/tpm: Return -EINVAL when determining tpm final events log size fails
  efi: Make CONFIG_EFI_RCI2_TABLE selectable on x86 only
This commit is contained in:
Linus Torvalds 2019-11-01 11:32:50 -07:00
commit b2a18c25c7
11 changed files with 56 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/boot/compressed/eboot.c
View File

@ -13,6 +13,7 @@
#include <asm/e820/types.h>
#include <asm/setup.h>
#include <asm/desc.h>
#include <asm/boot.h>
#include "../string.h"
#include "eboot.h"
@ -813,7 +814,8 @@ efi_main(struct efi_config *c, struct boot_params *boot_params)
status = efi_relocate_kernel(sys_table, &bzimage_addr,
hdr->init_size, hdr->init_size,
hdr->pref_address,
hdr->kernel_alignment);
hdr->kernel_alignment,
LOAD_PHYSICAL_ADDR);
if (status != EFI_SUCCESS) {
efi_printk(sys_table, "efi_relocate_kernel() failed!\n");
goto fail;

1
drivers/firmware/efi/Kconfig
View File

@ -182,6 +182,7 @@ config RESET_ATTACK_MITIGATION
config EFI_RCI2_TABLE
bool "EFI Runtime Configuration Interface Table Version 2 Support"
depends on X86 || COMPILE_TEST
help
Displays the content of the Runtime Configuration Interface
Table version 2 on Dell EMC PowerEdge systems as a binary

2
drivers/firmware/efi/efi.c
View File

@ -554,7 +554,7 @@ int __init efi_config_parse_tables(void *config_tables, int count, int sz,
sizeof(*seed) + size);
if (seed != NULL) {
pr_notice("seeding entropy pool\n");
add_device_randomness(seed->bits, seed->size);
add_bootloader_randomness(seed->bits, seed->size);
early_memunmap(seed, sizeof(*seed) + size);
} else {
pr_err("Could not map UEFI random seed!\n");

1
drivers/firmware/efi/libstub/Makefile
View File

@ -52,6 +52,7 @@ lib-$(CONFIG_EFI_ARMSTUB) += arm-stub.o fdt.o string.o random.o \
lib-$(CONFIG_ARM) += arm32-stub.o
lib-$(CONFIG_ARM64) += arm64-stub.o
CFLAGS_arm32-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
CFLAGS_arm64-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
#

16
drivers/firmware/efi/libstub/arm32-stub.c
View File

@ -195,6 +195,7 @@ efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
unsigned long dram_base,
efi_loaded_image_t *image)
{
unsigned long kernel_base;
efi_status_t status;
/*
@ -204,9 +205,18 @@ efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
* loaded. These assumptions are made by the decompressor,
* before any memory map is available.
*/
dram_base = round_up(dram_base, SZ_128M);
kernel_base = round_up(dram_base, SZ_128M);
status = reserve_kernel_base(sys_table, dram_base, reserve_addr,
/*
* Note that some platforms (notably, the Raspberry Pi 2) put
* spin-tables and other pieces of firmware at the base of RAM,
* abusing the fact that the window of TEXT_OFFSET bytes at the
* base of the kernel image is only partially used at the moment.
* (Up to 5 pages are used for the swapper page tables)
*/
kernel_base += TEXT_OFFSET - 5 * PAGE_SIZE;
status = reserve_kernel_base(sys_table, kernel_base, reserve_addr,
reserve_size);
if (status != EFI_SUCCESS) {
pr_efi_err(sys_table, "Unable to allocate memory for uncompressed kernel.\n");
@ -220,7 +230,7 @@ efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
*image_size = image->image_size;
status = efi_relocate_kernel(sys_table, image_addr, *image_size,
*image_size,
dram_base + MAX_UNCOMP_KERNEL_SIZE, 0);
kernel_base + MAX_UNCOMP_KERNEL_SIZE, 0, 0);
if (status != EFI_SUCCESS) {
pr_efi_err(sys_table, "Failed to relocate kernel.\n");
efi_free(sys_table, *reserve_size, *reserve_addr);

22
drivers/firmware/efi/libstub/efi-stub-helper.c
View File

@ -260,11 +260,11 @@ fail:
}
/*
* Allocate at the lowest possible address.
* Allocate at the lowest possible address that is not below 'min'.
*/
efi_status_t efi_low_alloc(efi_system_table_t *sys_table_arg,
efi_status_t efi_low_alloc_above(efi_system_table_t *sys_table_arg,
unsigned long size, unsigned long align,
unsigned long *addr)
unsigned long *addr, unsigned long min)
{
unsigned long map_size, desc_size, buff_size;
efi_memory_desc_t *map;
@ -311,13 +311,8 @@ efi_status_t efi_low_alloc(efi_system_table_t *sys_table_arg,
start = desc->phys_addr;
end = start + desc->num_pages * EFI_PAGE_SIZE;
/*
* Don't allocate at 0x0. It will confuse code that
* checks pointers against NULL. Skip the first 8
* bytes so we start at a nice even number.
*/
if (start == 0x0)
start += 8;
if (start < min)
start = min;
start = round_up(start, align);
if ((start + size) > end)
@ -698,7 +693,8 @@ efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg,
unsigned long image_size,
unsigned long alloc_size,
unsigned long preferred_addr,
unsigned long alignment)
unsigned long alignment,
unsigned long min_addr)
{
unsigned long cur_image_addr;
unsigned long new_addr = 0;
@ -731,8 +727,8 @@ efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg,
* possible.
*/
if (status != EFI_SUCCESS) {
status = efi_low_alloc(sys_table_arg, alloc_size, alignment,
&new_addr);
status = efi_low_alloc_above(sys_table_arg, alloc_size,
alignment, &new_addr, min_addr);
}
if (status != EFI_SUCCESS) {
pr_efi_err(sys_table_arg, "Failed to allocate usable memory for kernel.\n");

8
drivers/firmware/efi/test/efi_test.c
View File

@ -14,6 +14,7 @@
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/efi.h>
#include <linux/security.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
@ -717,6 +718,13 @@ static long efi_test_ioctl(struct file *file, unsigned int cmd,
static int efi_test_open(struct inode *inode, struct file *file)
{
int ret = security_locked_down(LOCKDOWN_EFI_TEST);
if (ret)
return ret;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
/*
* nothing special to do here
* We do accept multiple open files at the same time as we

1
drivers/firmware/efi/tpm.c
View File

@ -88,6 +88,7 @@ int __init efi_tpm_eventlog_init(void)
if (tbl_size < 0) {
pr_err(FW_BUG "Failed to parse event in TPM Final Events Log\n");
ret = -EINVAL;
goto out_calc;
}

18
include/linux/efi.h
View File

@ -1579,9 +1579,22 @@ char *efi_convert_cmdline(efi_system_table_t *sys_table_arg,
efi_status_t efi_get_memory_map(efi_system_table_t *sys_table_arg,
struct efi_boot_memmap *map);
efi_status_t efi_low_alloc_above(efi_system_table_t *sys_table_arg,
unsigned long size, unsigned long align,
unsigned long *addr, unsigned long min);
static inline
efi_status_t efi_low_alloc(efi_system_table_t *sys_table_arg,
unsigned long size, unsigned long align,
unsigned long *addr);
unsigned long *addr)
{
/*
* Don't allocate at 0x0. It will confuse code that
* checks pointers against NULL. Skip the first 8
* bytes so we start at a nice even number.
*/
return efi_low_alloc_above(sys_table_arg, size, align, addr, 0x8);
}
efi_status_t efi_high_alloc(efi_system_table_t *sys_table_arg,
unsigned long size, unsigned long align,
@ -1592,7 +1605,8 @@ efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg,
unsigned long image_size,
unsigned long alloc_size,
unsigned long preferred_addr,
unsigned long alignment);
unsigned long alignment,
unsigned long min_addr);
efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
efi_loaded_image_t *image,

1
include/linux/security.h
View File

@ -105,6 +105,7 @@ enum lockdown_reason {
LOCKDOWN_NONE,
LOCKDOWN_MODULE_SIGNATURE,
LOCKDOWN_DEV_MEM,
LOCKDOWN_EFI_TEST,
LOCKDOWN_KEXEC,
LOCKDOWN_HIBERNATION,
LOCKDOWN_PCI_ACCESS,

1
security/lockdown/lockdown.c
View File

@ -20,6 +20,7 @@ static const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX+1] = {
[LOCKDOWN_NONE] = "none",
[LOCKDOWN_MODULE_SIGNATURE] = "unsigned module loading",
[LOCKDOWN_DEV_MEM] = "/dev/mem,kmem,port",
[LOCKDOWN_EFI_TEST] = "/dev/efi_test access",
[LOCKDOWN_KEXEC] = "kexec of unsigned images",
[LOCKDOWN_HIBERNATION] = "hibernation",
[LOCKDOWN_PCI_ACCESS] = "direct PCI access",