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Merge tag 'efi-urgent-for-v5.8-rc4' of git://git.kernel.org/pub/scm/l…
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…inux/kernel/git/efi/efi into efi/urgent

Pull EFI fixes from Ard Biesheuvel:

 - Fix the layering violation in the use of the EFI runtime services
   availability mask in users of the 'efivars' abstraction
 - Revert build fix for GCC v4.8 which is no longer supported
 - Some fixes for build issues found by Atish while working on RISC-V support
 - Avoid --whole-archive when linking the stub on arm64
 - Some x86 EFI stub cleanups from Arvind
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Thomas Gleixner committed Jul 22, 2020
2 parents 2a55280 + 769e0fe commit 74f8555
Showing 12 changed files with 43 additions and 40 deletions.
2 changes: 1 addition & 1 deletion arch/arm64/Makefile
Original file line number Diff line number Diff line change
@@ -143,7 +143,7 @@ export TEXT_OFFSET

core-y += arch/arm64/
libs-y := arch/arm64/lib/ $(libs-y)
core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a

# Default target when executing plain make
boot := arch/arm64/boot
5 changes: 1 addition & 4 deletions drivers/firmware/efi/efi-pstore.c
Original file line number Diff line number Diff line change
@@ -356,10 +356,7 @@ static struct pstore_info efi_pstore_info = {

static __init int efivars_pstore_init(void)
{
if (!efi_rt_services_supported(EFI_RT_SUPPORTED_VARIABLE_SERVICES))
return 0;

if (!efivars_kobject())
if (!efivars_kobject() || !efivar_supports_writes())
return 0;

if (efivars_pstore_disable)
12 changes: 8 additions & 4 deletions drivers/firmware/efi/efi.c
Original file line number Diff line number Diff line change
@@ -176,11 +176,13 @@ static struct efivar_operations generic_ops;
static int generic_ops_register(void)
{
generic_ops.get_variable = efi.get_variable;
generic_ops.set_variable = efi.set_variable;
generic_ops.set_variable_nonblocking = efi.set_variable_nonblocking;
generic_ops.get_next_variable = efi.get_next_variable;
generic_ops.query_variable_store = efi_query_variable_store;

if (efi_rt_services_supported(EFI_RT_SUPPORTED_SET_VARIABLE)) {
generic_ops.set_variable = efi.set_variable;
generic_ops.set_variable_nonblocking = efi.set_variable_nonblocking;
}
return efivars_register(&generic_efivars, &generic_ops, efi_kobj);
}

@@ -382,7 +384,8 @@ static int __init efisubsys_init(void)
return -ENOMEM;
}

if (efi_rt_services_supported(EFI_RT_SUPPORTED_VARIABLE_SERVICES)) {
if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE |
EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME)) {
efivar_ssdt_load();
error = generic_ops_register();
if (error)
@@ -416,7 +419,8 @@ static int __init efisubsys_init(void)
err_remove_group:
sysfs_remove_group(efi_kobj, &efi_subsys_attr_group);
err_unregister:
if (efi_rt_services_supported(EFI_RT_SUPPORTED_VARIABLE_SERVICES))
if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE |
EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME))
generic_ops_unregister();
err_put:
kobject_put(efi_kobj);
5 changes: 1 addition & 4 deletions drivers/firmware/efi/efivars.c
Original file line number Diff line number Diff line change
@@ -680,11 +680,8 @@ int efivars_sysfs_init(void)
struct kobject *parent_kobj = efivars_kobject();
int error = 0;

if (!efi_rt_services_supported(EFI_RT_SUPPORTED_VARIABLE_SERVICES))
return -ENODEV;

/* No efivars has been registered yet */
if (!parent_kobj)
if (!parent_kobj || !efivar_supports_writes())
return 0;

printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION,
3 changes: 1 addition & 2 deletions drivers/firmware/efi/libstub/Makefile
Original file line number Diff line number Diff line change
@@ -6,8 +6,7 @@
# enabled, even if doing so doesn't break the build.
#
cflags-$(CONFIG_X86_32) := -march=i386
cflags-$(CONFIG_X86_64) := -mcmodel=small \
$(call cc-option,-maccumulate-outgoing-args)
cflags-$(CONFIG_X86_64) := -mcmodel=small
cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ \
-fPIC -fno-strict-aliasing -mno-red-zone \
-mno-mmx -mno-sse -fshort-wchar \
2 changes: 1 addition & 1 deletion drivers/firmware/efi/libstub/alignedmem.c
Original file line number Diff line number Diff line change
@@ -44,7 +44,7 @@ efi_status_t efi_allocate_pages_aligned(unsigned long size, unsigned long *addr,
*addr = ALIGN((unsigned long)alloc_addr, align);

if (slack > 0) {
int l = (alloc_addr % align) / EFI_PAGE_SIZE;
int l = (alloc_addr & (align - 1)) / EFI_PAGE_SIZE;

if (l) {
efi_bs_call(free_pages, alloc_addr, slack - l + 1);
17 changes: 0 additions & 17 deletions drivers/firmware/efi/libstub/efi-stub.c
Original file line number Diff line number Diff line change
@@ -121,23 +121,6 @@ static unsigned long get_dram_base(void)
return membase;
}

/*
* This function handles the architcture specific differences between arm and
* arm64 regarding where the kernel image must be loaded and any memory that
* must be reserved. On failure it is required to free all
* all allocations it has made.
*/
efi_status_t handle_kernel_image(unsigned long *image_addr,
unsigned long *image_size,
unsigned long *reserve_addr,
unsigned long *reserve_size,
unsigned long dram_base,
efi_loaded_image_t *image);

asmlinkage void __noreturn efi_enter_kernel(unsigned long entrypoint,
unsigned long fdt_addr,
unsigned long fdt_size);

/*
* EFI entry point for the arm/arm64 EFI stubs. This is the entrypoint
* that is described in the PE/COFF header. Most of the code is the same
16 changes: 16 additions & 0 deletions drivers/firmware/efi/libstub/efistub.h
Original file line number Diff line number Diff line change
@@ -776,6 +776,22 @@ efi_status_t efi_load_initrd(efi_loaded_image_t *image,
unsigned long *load_size,
unsigned long soft_limit,
unsigned long hard_limit);
/*
* This function handles the architcture specific differences between arm and
* arm64 regarding where the kernel image must be loaded and any memory that
* must be reserved. On failure it is required to free all
* all allocations it has made.
*/
efi_status_t handle_kernel_image(unsigned long *image_addr,
unsigned long *image_size,
unsigned long *reserve_addr,
unsigned long *reserve_size,
unsigned long dram_base,
efi_loaded_image_t *image);

asmlinkage void __noreturn efi_enter_kernel(unsigned long entrypoint,
unsigned long fdt_addr,
unsigned long fdt_size);

void efi_handle_post_ebs_state(void);

8 changes: 4 additions & 4 deletions drivers/firmware/efi/libstub/x86-stub.c
Original file line number Diff line number Diff line change
@@ -8,6 +8,7 @@

#include <linux/efi.h>
#include <linux/pci.h>
#include <linux/stddef.h>

#include <asm/efi.h>
#include <asm/e820/types.h>
@@ -361,8 +362,6 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
int options_size = 0;
efi_status_t status;
char *cmdline_ptr;
unsigned long ramdisk_addr;
unsigned long ramdisk_size;

efi_system_table = sys_table_arg;

@@ -390,8 +389,9 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,

hdr = &boot_params->hdr;

/* Copy the second sector to boot_params */
memcpy(&hdr->jump, image_base + 512, 512);
/* Copy the setup header from the second sector to boot_params */
memcpy(&hdr->jump, image_base + 512,
sizeof(struct setup_header) - offsetof(struct setup_header, jump));

/*
* Fill out some of the header fields ourselves because the
6 changes: 6 additions & 0 deletions drivers/firmware/efi/vars.c
Original file line number Diff line number Diff line change
@@ -1229,3 +1229,9 @@ int efivars_unregister(struct efivars *efivars)
return rv;
}
EXPORT_SYMBOL_GPL(efivars_unregister);

int efivar_supports_writes(void)
{
return __efivars && __efivars->ops->set_variable;
}
EXPORT_SYMBOL_GPL(efivar_supports_writes);
6 changes: 3 additions & 3 deletions fs/efivarfs/super.c
Original file line number Diff line number Diff line change
@@ -201,6 +201,9 @@ static int efivarfs_fill_super(struct super_block *sb, struct fs_context *fc)
sb->s_d_op = &efivarfs_d_ops;
sb->s_time_gran = 1;

if (!efivar_supports_writes())
sb->s_flags |= SB_RDONLY;

inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0, true);
if (!inode)
return -ENOMEM;
@@ -252,9 +255,6 @@ static struct file_system_type efivarfs_type = {

static __init int efivarfs_init(void)
{
if (!efi_rt_services_supported(EFI_RT_SUPPORTED_VARIABLE_SERVICES))
return -ENODEV;

if (!efivars_kobject())
return -ENODEV;

1 change: 1 addition & 0 deletions include/linux/efi.h
Original file line number Diff line number Diff line change
@@ -994,6 +994,7 @@ int efivars_register(struct efivars *efivars,
int efivars_unregister(struct efivars *efivars);
struct kobject *efivars_kobject(void);

int efivar_supports_writes(void);
int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
void *data, bool duplicates, struct list_head *head);

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