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Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next

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Pull x86 EFI updates from Peter Anvin:
 "A collection of EFI changes.  The perhaps most important one is to
  fully save and restore the FPU state around each invocation of EFI
  runtime, and to not choke on non-ASCII characters in the boot stub"

* 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  efivars: Add compatibility code for compat tasks
  efivars: Refactor sanity checking code into separate function
  efivars: Stop passing a struct argument to efivar_validate()
  efivars: Check size of user object
  efivars: Use local variables instead of a pointer dereference
  x86/efi: Save and restore FPU context around efi_calls (i386)
  x86/efi: Save and restore FPU context around efi_calls (x86_64)
  x86/efi: Implement a __efi_call_virt macro
  x86, fpu: Extend the use of static_cpu_has_safe
  x86/efi: Delete most of the efi_call* macros
  efi: x86: Handle arbitrary Unicode characters
  efi: Add get_dram_base() helper function
  efi: Add shared printk wrapper for consistent prefixing
  efi: create memory map iteration helper
  efi: efi-stub-helper cleanup
This commit is contained in:
Linus Torvalds 2014-06-05 08:16:29 -07:00
commit 046f153343
11 changed files with 363 additions and 265 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/x86/boot/compressed/eboot.c
View File

@ -1087,8 +1087,7 @@ struct boot_params *make_boot_params(struct efi_config *c)
hdr->type_of_loader = 0x21;
/* Convert unicode cmdline to ascii */
cmdline_ptr = efi_convert_cmdline_to_ascii(sys_table, image,
&options_size);
cmdline_ptr = efi_convert_cmdline(sys_table, image, &options_size);
if (!cmdline_ptr)
goto fail;
hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;

2
arch/x86/boot/compressed/head_64.S
View File

@ -452,7 +452,7 @@ efi32_config:
.global efi64_config
efi64_config:
.fill 11,8,0
.quad efi_call6
.quad efi_call
.byte 1
#endif /* CONFIG_EFI_STUB */

94
arch/x86/include/asm/efi.h
View File

@ -1,6 +1,7 @@
#ifndef _ASM_X86_EFI_H
#define _ASM_X86_EFI_H
#include <asm/i387.h>
/*
* We map the EFI regions needed for runtime services non-contiguously,
* with preserved alignment on virtual addresses starting from -4G down
@ -27,91 +28,58 @@
extern unsigned long asmlinkage efi_call_phys(void *, ...);
#define efi_call_phys0(f) efi_call_phys(f)
#define efi_call_phys1(f, a1) efi_call_phys(f, a1)
#define efi_call_phys2(f, a1, a2) efi_call_phys(f, a1, a2)
#define efi_call_phys3(f, a1, a2, a3) efi_call_phys(f, a1, a2, a3)
#define efi_call_phys4(f, a1, a2, a3, a4) \
efi_call_phys(f, a1, a2, a3, a4)
#define efi_call_phys5(f, a1, a2, a3, a4, a5) \
efi_call_phys(f, a1, a2, a3, a4, a5)
#define efi_call_phys6(f, a1, a2, a3, a4, a5, a6) \
efi_call_phys(f, a1, a2, a3, a4, a5, a6)
/*
* Wrap all the virtual calls in a way that forces the parameters on the stack.
*/
/* Use this macro if your virtual returns a non-void value */
#define efi_call_virt(f, args...) \
((efi_##f##_t __attribute__((regparm(0)))*)efi.systab->runtime->f)(args)
({ \
efi_status_t __s; \
kernel_fpu_begin(); \
__s = ((efi_##f##_t __attribute__((regparm(0)))*) \
efi.systab->runtime->f)(args); \
kernel_fpu_end(); \
__s; \
})
#define efi_call_virt0(f) efi_call_virt(f)
#define efi_call_virt1(f, a1) efi_call_virt(f, a1)
#define efi_call_virt2(f, a1, a2) efi_call_virt(f, a1, a2)
#define efi_call_virt3(f, a1, a2, a3) efi_call_virt(f, a1, a2, a3)
#define efi_call_virt4(f, a1, a2, a3, a4) \
efi_call_virt(f, a1, a2, a3, a4)
#define efi_call_virt5(f, a1, a2, a3, a4, a5) \
efi_call_virt(f, a1, a2, a3, a4, a5)
#define efi_call_virt6(f, a1, a2, a3, a4, a5, a6) \
efi_call_virt(f, a1, a2, a3, a4, a5, a6)
/* Use this macro if your virtual call does not return any value */
#define __efi_call_virt(f, args...) \
({ \
kernel_fpu_begin(); \
((efi_##f##_t __attribute__((regparm(0)))*) \
efi.systab->runtime->f)(args); \
kernel_fpu_end(); \
})
#define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size)
#else /* !CONFIG_X86_32 */
extern u64 efi_call0(void *fp);
extern u64 efi_call1(void *fp, u64 arg1);
extern u64 efi_call2(void *fp, u64 arg1, u64 arg2);
extern u64 efi_call3(void *fp, u64 arg1, u64 arg2, u64 arg3);
extern u64 efi_call4(void *fp, u64 arg1, u64 arg2, u64 arg3, u64 arg4);
extern u64 efi_call5(void *fp, u64 arg1, u64 arg2, u64 arg3,
u64 arg4, u64 arg5);
extern u64 efi_call6(void *fp, u64 arg1, u64 arg2, u64 arg3,
u64 arg4, u64 arg5, u64 arg6);
#define EFI_LOADER_SIGNATURE "EL64"
#define efi_call_phys0(f) \
efi_call0((f))
#define efi_call_phys1(f, a1) \
efi_call1((f), (u64)(a1))
#define efi_call_phys2(f, a1, a2) \
efi_call2((f), (u64)(a1), (u64)(a2))
#define efi_call_phys3(f, a1, a2, a3) \
efi_call3((f), (u64)(a1), (u64)(a2), (u64)(a3))
#define efi_call_phys4(f, a1, a2, a3, a4) \
efi_call4((f), (u64)(a1), (u64)(a2), (u64)(a3), \
(u64)(a4))
#define efi_call_phys5(f, a1, a2, a3, a4, a5) \
efi_call5((f), (u64)(a1), (u64)(a2), (u64)(a3), \
(u64)(a4), (u64)(a5))
#define efi_call_phys6(f, a1, a2, a3, a4, a5, a6) \
efi_call6((f), (u64)(a1), (u64)(a2), (u64)(a3), \
(u64)(a4), (u64)(a5), (u64)(a6))
extern u64 asmlinkage efi_call(void *fp, ...);
#define _efi_call_virtX(x, f, ...) \
#define efi_call_phys(f, args...) efi_call((f), args)
#define efi_call_virt(f, ...) \
({ \
efi_status_t __s; \
\
efi_sync_low_kernel_mappings(); \
preempt_disable(); \
__s = efi_call##x((void *)efi.systab->runtime->f, __VA_ARGS__); \
__kernel_fpu_begin(); \
__s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__); \
__kernel_fpu_end(); \
preempt_enable(); \
__s; \
})
#define efi_call_virt0(f) \
_efi_call_virtX(0, f)
#define efi_call_virt1(f, a1) \
_efi_call_virtX(1, f, (u64)(a1))
#define efi_call_virt2(f, a1, a2) \
_efi_call_virtX(2, f, (u64)(a1), (u64)(a2))
#define efi_call_virt3(f, a1, a2, a3) \
_efi_call_virtX(3, f, (u64)(a1), (u64)(a2), (u64)(a3))
#define efi_call_virt4(f, a1, a2, a3, a4) \
_efi_call_virtX(4, f, (u64)(a1), (u64)(a2), (u64)(a3), (u64)(a4))
#define efi_call_virt5(f, a1, a2, a3, a4, a5) \
_efi_call_virtX(5, f, (u64)(a1), (u64)(a2), (u64)(a3), (u64)(a4), (u64)(a5))
#define efi_call_virt6(f, a1, a2, a3, a4, a5, a6) \
_efi_call_virtX(6, f, (u64)(a1), (u64)(a2), (u64)(a3), (u64)(a4), (u64)(a5), (u64)(a6))
/*
* All X86_64 virt calls return non-void values. Thus, use non-void call for
* virt calls that would be void on X86_32.
*/
#define __efi_call_virt(f, args...) efi_call_virt(f, args)
extern void __iomem *efi_ioremap(unsigned long addr, unsigned long size,
u32 type, u64 attribute);

10
arch/x86/include/asm/fpu-internal.h
View File

@ -87,22 +87,22 @@ static inline int is_x32_frame(void)
static __always_inline __pure bool use_eager_fpu(void)
{
return static_cpu_has(X86_FEATURE_EAGER_FPU);
return static_cpu_has_safe(X86_FEATURE_EAGER_FPU);
}
static __always_inline __pure bool use_xsaveopt(void)
{
return static_cpu_has(X86_FEATURE_XSAVEOPT);
return static_cpu_has_safe(X86_FEATURE_XSAVEOPT);
}
static __always_inline __pure bool use_xsave(void)
{
return static_cpu_has(X86_FEATURE_XSAVE);
return static_cpu_has_safe(X86_FEATURE_XSAVE);
}
static __always_inline __pure bool use_fxsr(void)
{
return static_cpu_has(X86_FEATURE_FXSR);
return static_cpu_has_safe(X86_FEATURE_FXSR);
}
static inline void fx_finit(struct i387_fxsave_struct *fx)
@ -293,7 +293,7 @@ static inline int restore_fpu_checking(struct task_struct *tsk)
/* AMD K7/K8 CPUs don't save/restore FDP/FIP/FOP unless an exception
is pending. Clear the x87 state here by setting it to fixed
values. "m" is a random variable that should be in L1 */
if (unlikely(static_cpu_has(X86_FEATURE_FXSAVE_LEAK))) {
if (unlikely(static_cpu_has_safe(X86_FEATURE_FXSAVE_LEAK))) {
asm volatile(
"fnclex\n\t"
"emms\n\t"

28
arch/x86/platform/efi/efi.c
View File

@ -110,7 +110,7 @@ static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
efi_status_t status;
spin_lock_irqsave(&rtc_lock, flags);
status = efi_call_virt2(get_time, tm, tc);
status = efi_call_virt(get_time, tm, tc);
spin_unlock_irqrestore(&rtc_lock, flags);
return status;
}
@ -121,7 +121,7 @@ static efi_status_t virt_efi_set_time(efi_time_t *tm)
efi_status_t status;
spin_lock_irqsave(&rtc_lock, flags);
status = efi_call_virt1(set_time, tm);
status = efi_call_virt(set_time, tm);
spin_unlock_irqrestore(&rtc_lock, flags);
return status;
}
@ -134,8 +134,7 @@ static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
efi_status_t status;
spin_lock_irqsave(&rtc_lock, flags);
status = efi_call_virt3(get_wakeup_time,
enabled, pending, tm);
status = efi_call_virt(get_wakeup_time, enabled, pending, tm);
spin_unlock_irqrestore(&rtc_lock, flags);
return status;
}
@ -146,8 +145,7 @@ static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
efi_status_t status;
spin_lock_irqsave(&rtc_lock, flags);
status = efi_call_virt2(set_wakeup_time,
enabled, tm);
status = efi_call_virt(set_wakeup_time, enabled, tm);
spin_unlock_irqrestore(&rtc_lock, flags);
return status;
}
@ -158,7 +156,7 @@ static efi_status_t virt_efi_get_variable(efi_char16_t *name,
unsigned long *data_size,
void *data)
{
return efi_call_virt5(get_variable,
return efi_call_virt(get_variable,
name, vendor, attr,
data_size, data);
}
@ -167,7 +165,7 @@ static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
efi_char16_t *name,
efi_guid_t *vendor)
{
return efi_call_virt3(get_next_variable,
return efi_call_virt(get_next_variable,
name_size, name, vendor);
}
@ -177,7 +175,7 @@ static efi_status_t virt_efi_set_variable(efi_char16_t *name,
unsigned long data_size,
void *data)
{
return efi_call_virt5(set_variable,
return efi_call_virt(set_variable,
name, vendor, attr,
data_size, data);
}
@ -190,13 +188,13 @@ static efi_status_t virt_efi_query_variable_info(u32 attr,
if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
return EFI_UNSUPPORTED;
return efi_call_virt4(query_variable_info, attr, storage_space,
return efi_call_virt(query_variable_info, attr, storage_space,
remaining_space, max_variable_size);
}
static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
{
return efi_call_virt1(get_next_high_mono_count, count);
return efi_call_virt(get_next_high_mono_count, count);
}
static void virt_efi_reset_system(int reset_type,
@ -204,7 +202,7 @@ static void virt_efi_reset_system(int reset_type,
unsigned long data_size,
efi_char16_t *data)
{
efi_call_virt4(reset_system, reset_type, status,
__efi_call_virt(reset_system, reset_type, status,
data_size, data);
}
@ -215,7 +213,7 @@ static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
return EFI_UNSUPPORTED;
return efi_call_virt3(update_capsule, capsules, count, sg_list);
return efi_call_virt(update_capsule, capsules, count, sg_list);
}
static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
@ -226,7 +224,7 @@ static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
return EFI_UNSUPPORTED;
return efi_call_virt4(query_capsule_caps, capsules, count, max_size,
return efi_call_virt(query_capsule_caps, capsules, count, max_size,
reset_type);
}
@ -239,7 +237,7 @@ static efi_status_t __init phys_efi_set_virtual_address_map(
efi_status_t status;
efi_call_phys_prelog();
status = efi_call_phys4(efi_phys.set_virtual_address_map,
status = efi_call_phys(efi_phys.set_virtual_address_map,
memory_map_size, descriptor_size,
descriptor_version, virtual_map);
efi_call_phys_epilog();

81
arch/x86/platform/efi/efi_stub_64.S
View File

@ -73,84 +73,7 @@
2:
.endm
ENTRY(efi_call0)
SAVE_XMM
subq $32, %rsp
SWITCH_PGT
call *%rdi
RESTORE_PGT
addq $32, %rsp
RESTORE_XMM
ret
ENDPROC(efi_call0)
ENTRY(efi_call1)
SAVE_XMM
subq $32, %rsp
mov %rsi, %rcx
SWITCH_PGT
call *%rdi
RESTORE_PGT
addq $32, %rsp
RESTORE_XMM
ret
ENDPROC(efi_call1)
ENTRY(efi_call2)
SAVE_XMM
subq $32, %rsp
mov %rsi, %rcx
SWITCH_PGT
call *%rdi
RESTORE_PGT
addq $32, %rsp
RESTORE_XMM
ret
ENDPROC(efi_call2)
ENTRY(efi_call3)
SAVE_XMM
subq $32, %rsp
mov %rcx, %r8
mov %rsi, %rcx
SWITCH_PGT
call *%rdi
RESTORE_PGT
addq $32, %rsp
RESTORE_XMM
ret
ENDPROC(efi_call3)
ENTRY(efi_call4)
SAVE_XMM
subq $32, %rsp
mov %r8, %r9
mov %rcx, %r8
mov %rsi, %rcx
SWITCH_PGT
call *%rdi
RESTORE_PGT
addq $32, %rsp
RESTORE_XMM
ret
ENDPROC(efi_call4)
ENTRY(efi_call5)
SAVE_XMM
subq $48, %rsp
mov %r9, 32(%rsp)
mov %r8, %r9
mov %rcx, %r8
mov %rsi, %rcx
SWITCH_PGT
call *%rdi
RESTORE_PGT
addq $48, %rsp
RESTORE_XMM
ret
ENDPROC(efi_call5)
ENTRY(efi_call6)
ENTRY(efi_call)
SAVE_XMM
mov (%rsp), %rax
mov 8(%rax), %rax
@ -166,7 +89,7 @@ ENTRY(efi_call6)
addq $48, %rsp
RESTORE_XMM
ret
ENDPROC(efi_call6)
ENDPROC(efi_call)
#ifdef CONFIG_EFI_MIXED

2
arch/x86/platform/uv/bios_uv.c
View File

@ -39,7 +39,7 @@ s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
*/
return BIOS_STATUS_UNIMPLEMENTED;
ret = efi_call6((void *)__va(tab->function), (u64)which,
ret = efi_call((void *)__va(tab->function), (u64)which,
a1, a2, a3, a4, a5);
return ret;
}

140
drivers/firmware/efi/efi-stub-helper.c
View File

@ -11,6 +11,10 @@
*/
#define EFI_READ_CHUNK_SIZE (1024 * 1024)
/* error code which can't be mistaken for valid address */
#define EFI_ERROR (~0UL)
struct file_info {
efi_file_handle_t *handle;
u64 size;
@ -33,6 +37,9 @@ static void efi_printk(efi_system_table_t *sys_table_arg, char *str)
}
}
#define pr_efi(sys_table, msg) efi_printk(sys_table, "EFI stub: "msg)
#define pr_efi_err(sys_table, msg) efi_printk(sys_table, "EFI stub: ERROR: "msg)
static efi_status_t efi_get_memory_map(efi_system_table_t *sys_table_arg,
efi_memory_desc_t **map,
@ -80,6 +87,32 @@ fail:
return status;
}
static unsigned long __init get_dram_base(efi_system_table_t *sys_table_arg)
{
efi_status_t status;
unsigned long map_size;
unsigned long membase = EFI_ERROR;
struct efi_memory_map map;
efi_memory_desc_t *md;
status = efi_get_memory_map(sys_table_arg, (efi_memory_desc_t **)&map.map,
&map_size, &map.desc_size, NULL, NULL);
if (status != EFI_SUCCESS)
return membase;
map.map_end = map.map + map_size;
for_each_efi_memory_desc(&map, md)
if (md->attribute & EFI_MEMORY_WB)
if (membase > md->phys_addr)
membase = md->phys_addr;
efi_call_early(free_pool, map.map);
return membase;
}
/*
* Allocate at the highest possible address that is not above 'max'.
*/
@ -267,7 +300,7 @@ static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
struct file_info *files;
unsigned long file_addr;
u64 file_size_total;
efi_file_handle_t *fh;
efi_file_handle_t *fh = NULL;
efi_status_t status;
int nr_files;
char *str;
@ -310,7 +343,7 @@ static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
nr_files * sizeof(*files), (void **)&files);
if (status != EFI_SUCCESS) {
efi_printk(sys_table_arg, "Failed to alloc mem for file handle list\n");
pr_efi_err(sys_table_arg, "Failed to alloc mem for file handle list\n");
goto fail;
}
@ -374,13 +407,13 @@ static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
status = efi_high_alloc(sys_table_arg, file_size_total, 0x1000,
&file_addr, max_addr);
if (status != EFI_SUCCESS) {
efi_printk(sys_table_arg, "Failed to alloc highmem for files\n");
pr_efi_err(sys_table_arg, "Failed to alloc highmem for files\n");
goto close_handles;
}
/* We've run out of free low memory. */
if (file_addr > max_addr) {
efi_printk(sys_table_arg, "We've run out of free low memory\n");
pr_efi_err(sys_table_arg, "We've run out of free low memory\n");
status = EFI_INVALID_PARAMETER;
goto free_file_total;
}
@ -401,7 +434,7 @@ static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
&chunksize,
(void *)addr);
if (status != EFI_SUCCESS) {
efi_printk(sys_table_arg, "Failed to read file\n");
pr_efi_err(sys_table_arg, "Failed to read file\n");
goto free_file_total;
}
addr += chunksize;
@ -486,7 +519,7 @@ static efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg,
&new_addr);
}
if (status != EFI_SUCCESS) {
efi_printk(sys_table_arg, "ERROR: Failed to allocate usable memory for kernel.\n");
pr_efi_err(sys_table_arg, "Failed to allocate usable memory for kernel.\n");
return status;
}
@ -502,63 +535,100 @@ static efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg,
return status;
}
/*
* Get the number of UTF-8 bytes corresponding to an UTF-16 character.
* This overestimates for surrogates, but that is okay.
*/
static int efi_utf8_bytes(u16 c)
{
return 1 + (c >= 0x80) + (c >= 0x800);
}
/*
* Convert an UTF-16 string, not necessarily null terminated, to UTF-8.
*/
static u8 *efi_utf16_to_utf8(u8 *dst, const u16 *src, int n)
{
unsigned int c;
while (n--) {
c = *src++;
if (n && c >= 0xd800 && c <= 0xdbff &&
*src >= 0xdc00 && *src <= 0xdfff) {
c = 0x10000 + ((c & 0x3ff) << 10) + (*src & 0x3ff);
src++;
n--;
}
if (c >= 0xd800 && c <= 0xdfff)
c = 0xfffd; /* Unmatched surrogate */
if (c < 0x80) {
*dst++ = c;
continue;
}
if (c < 0x800) {
*dst++ = 0xc0 + (c >> 6);
goto t1;
}
if (c < 0x10000) {
*dst++ = 0xe0 + (c >> 12);
goto t2;
}
*dst++ = 0xf0 + (c >> 18);
*dst++ = 0x80 + ((c >> 12) & 0x3f);
t2:
*dst++ = 0x80 + ((c >> 6) & 0x3f);
t1:
*dst++ = 0x80 + (c & 0x3f);
}
return dst;
}
/*
* Convert the unicode UEFI command line to ASCII to pass to kernel.
* Size of memory allocated return in *cmd_line_len.
* Returns NULL on error.
*/
static char *efi_convert_cmdline_to_ascii(efi_system_table_t *sys_table_arg,
static char *efi_convert_cmdline(efi_system_table_t *sys_table_arg,
efi_loaded_image_t *image,
int *cmd_line_len)
{
u16 *s2;
const u16 *s2;
u8 *s1 = NULL;
unsigned long cmdline_addr = 0;
int load_options_size = image->load_options_size / 2; /* ASCII */
void *options = image->load_options;
int options_size = 0;
int load_options_chars = image->load_options_size / 2; /* UTF-16 */
const u16 *options = image->load_options;
int options_bytes = 0; /* UTF-8 bytes */
int options_chars = 0; /* UTF-16 chars */
efi_status_t status;
int i;
u16 zero = 0;
if (options) {
s2 = options;
while (*s2 && *s2 != '\n' && options_size < load_options_size) {
s2++;
options_size++;
while (*s2 && *s2 != '\n'
&& options_chars < load_options_chars) {
options_bytes += efi_utf8_bytes(*s2++);
options_chars++;
}
}
if (options_size == 0) {
if (!options_chars) {
/* No command line options, so return empty string*/
options_size = 1;
options = &zero;
}
options_size++; /* NUL termination */
#ifdef CONFIG_ARM
/*
* For ARM, allocate at a high address to avoid reserved
* regions at low addresses that we don't know the specfics of
* at the time we are processing the command line.
*/
status = efi_high_alloc(sys_table_arg, options_size, 0,
&cmdline_addr, 0xfffff000);
#else
status = efi_low_alloc(sys_table_arg, options_size, 0,
&cmdline_addr);
#endif
options_bytes++; /* NUL termination */
status = efi_low_alloc(sys_table_arg, options_bytes, 0, &cmdline_addr);
if (status != EFI_SUCCESS)
return NULL;
s1 = (u8 *)cmdline_addr;
s2 = (u16 *)options;
for (i = 0; i < options_size - 1; i++)
*s1++ = *s2++;
s2 = (const u16 *)options;
s1 = efi_utf16_to_utf8(s1, s2, options_chars);
*s1 = '\0';
*cmd_line_len = options_size;
*cmd_line_len = options_bytes;
return (char *)cmdline_addr;
}

188
drivers/firmware/efi/efivars.c
View File

@ -69,6 +69,7 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/ucs2_string.h>
#include <linux/compat.h>
#define EFIVARS_VERSION "0.08"
#define EFIVARS_DATE "2004-May-17"
@ -86,6 +87,15 @@ static struct kset *efivars_kset;
static struct bin_attribute *efivars_new_var;
static struct bin_attribute *efivars_del_var;
struct compat_efi_variable {
efi_char16_t VariableName[EFI_VAR_NAME_LEN/sizeof(efi_char16_t)];
efi_guid_t VendorGuid;
__u32 DataSize;
__u8 Data[1024];
__u32 Status;
__u32 Attributes;
} __packed;
struct efivar_attribute {
struct attribute attr;
ssize_t (*show) (struct efivar_entry *entry, char *buf);
@ -189,6 +199,54 @@ efivar_data_read(struct efivar_entry *entry, char *buf)
memcpy(buf, var->Data, var->DataSize);
return var->DataSize;
}
static inline int
sanity_check(struct efi_variable *var, efi_char16_t *name, efi_guid_t vendor,
unsigned long size, u32 attributes, u8 *data)
{
/*
* If only updating the variable data, then the name
* and guid should remain the same
*/
if (memcmp(name, var->VariableName, sizeof(var->VariableName)) ||
efi_guidcmp(vendor, var->VendorGuid)) {
printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n");
return -EINVAL;
}
if ((size <= 0) || (attributes == 0)){
printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n");
return -EINVAL;
}
if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||
efivar_validate(name, data, size) == false) {
printk(KERN_ERR "efivars: Malformed variable content\n");
return -EINVAL;
}
return 0;
}
static inline bool is_compat(void)
{
if (IS_ENABLED(CONFIG_COMPAT) && is_compat_task())
return true;
return false;
}
static void
copy_out_compat(struct efi_variable *dst, struct compat_efi_variable *src)
{
memcpy(dst->VariableName, src->VariableName, EFI_VAR_NAME_LEN);
memcpy(dst->Data, src->Data, sizeof(src->Data));
dst->VendorGuid = src->VendorGuid;
dst->DataSize = src->DataSize;
dst->Attributes = src->Attributes;
}
/*
* We allow each variable to be edited via rewriting the
* entire efi variable structure.
@ -197,37 +255,51 @@ static ssize_t
efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
{
struct efi_variable *new_var, *var = &entry->var;
efi_char16_t *name;
unsigned long size;
efi_guid_t vendor;
u32 attributes;
u8 *data;
int err;
if (is_compat()) {
struct compat_efi_variable *compat;
if (count != sizeof(*compat))
return -EINVAL;
compat = (struct compat_efi_variable *)buf;
attributes = compat->Attributes;
vendor = compat->VendorGuid;
name = compat->VariableName;
size = compat->DataSize;
data = compat->Data;
err = sanity_check(var, name, vendor, size, attributes, data);
if (err)
return err;
copy_out_compat(&entry->var, compat);
} else {
if (count != sizeof(struct efi_variable))
return -EINVAL;
new_var = (struct efi_variable *)buf;
/*
* If only updating the variable data, then the name
* and guid should remain the same
*/
if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) ||
efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) {
printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n");
return -EINVAL;
}
if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){
printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n");
return -EINVAL;
}
attributes = new_var->Attributes;
vendor = new_var->VendorGuid;
name = new_var->VariableName;
size = new_var->DataSize;
data = new_var->Data;
if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 ||
efivar_validate(new_var, new_var->Data, new_var->DataSize) == false) {
printk(KERN_ERR "efivars: Malformed variable content\n");
return -EINVAL;
}
err = sanity_check(var, name, vendor, size, attributes, data);
if (err)
return err;
memcpy(&entry->var, new_var, count);
}
err = efivar_entry_set(entry, new_var->Attributes,
new_var->DataSize, new_var->Data, NULL);
err = efivar_entry_set(entry, attributes, size, data, NULL);
if (err) {
printk(KERN_WARNING "efivars: set_variable() failed: status=%d\n", err);
return -EIO;
@ -240,6 +312,8 @@ static ssize_t
efivar_show_raw(struct efivar_entry *entry, char *buf)
{
struct efi_variable *var = &entry->var;
struct compat_efi_variable *compat;
size_t size;
if (!entry || !buf)
return 0;
@ -249,9 +323,23 @@ efivar_show_raw(struct efivar_entry *entry, char *buf)
&entry->var.DataSize, entry->var.Data))
return -EIO;
memcpy(buf, var, sizeof(*var));
if (is_compat()) {
compat = (struct compat_efi_variable *)buf;
return sizeof(*var);
size = sizeof(*compat);
memcpy(compat->VariableName, var->VariableName,
EFI_VAR_NAME_LEN);
memcpy(compat->Data, var->Data, sizeof(compat->Data));
compat->VendorGuid = var->VendorGuid;
compat->DataSize = var->DataSize;
compat->Attributes = var->Attributes;
} else {
size = sizeof(*var);
memcpy(buf, var, size);
}
return size;
}
/*
@ -326,15 +414,39 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t pos, size_t count)
{
struct compat_efi_variable *compat = (struct compat_efi_variable *)buf;
struct efi_variable *new_var = (struct efi_variable *)buf;
struct efivar_entry *new_entry;
bool need_compat = is_compat();
efi_char16_t *name;
unsigned long size;
u32 attributes;
u8 *data;
int err;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 ||
efivar_validate(new_var, new_var->Data, new_var->DataSize) == false) {
if (need_compat) {
if (count != sizeof(*compat))
return -EINVAL;
attributes = compat->Attributes;
name = compat->VariableName;
size = compat->DataSize;
data = compat->Data;
} else {
if (count != sizeof(*new_var))
return -EINVAL;
attributes = new_var->Attributes;
name = new_var->VariableName;
size = new_var->DataSize;
data = new_var->Data;
}
if ((attributes & ~EFI_VARIABLE_MASK) != 0 ||
efivar_validate(name, data, size) == false) {
printk(KERN_ERR "efivars: Malformed variable content\n");
return -EINVAL;
}
@ -343,10 +455,13 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
if (!new_entry)
return -ENOMEM;
if (need_compat)
copy_out_compat(&new_entry->var, compat);
else
memcpy(&new_entry->var, new_var, sizeof(*new_var));
err = efivar_entry_set(new_entry, new_var->Attributes, new_var->DataSize,
new_var->Data, &efivar_sysfs_list);
err = efivar_entry_set(new_entry, attributes, size,
data, &efivar_sysfs_list);
if (err) {
if (err == -EEXIST)
err = -EINVAL;
@ -369,15 +484,32 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
char *buf, loff_t pos, size_t count)
{
struct efi_variable *del_var = (struct efi_variable *)buf;
struct compat_efi_variable *compat;
struct efivar_entry *entry;
efi_char16_t *name;
efi_guid_t vendor;
int err = 0;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (is_compat()) {
if (count != sizeof(*compat))
return -EINVAL;
compat = (struct compat_efi_variable *)buf;
name = compat->VariableName;
vendor = compat->VendorGuid;
} else {
if (count != sizeof(*del_var))
return -EINVAL;
name = del_var->VariableName;
vendor = del_var->VendorGuid;
}
efivar_entry_iter_begin();
entry = efivar_entry_find(del_var->VariableName, del_var->VendorGuid,
&efivar_sysfs_list, true);
entry = efivar_entry_find(name, vendor, &efivar_sysfs_list, true);
if (!entry)
err = -EINVAL;
else if (__efivar_entry_delete(entry))

30
drivers/firmware/efi/vars.c
View File

@ -42,7 +42,7 @@ DECLARE_WORK(efivar_work, NULL);
EXPORT_SYMBOL_GPL(efivar_work);
static bool
validate_device_path(struct efi_variable *var, int match, u8 *buffer,
validate_device_path(efi_char16_t *var_name, int match, u8 *buffer,
unsigned long len)
{
struct efi_generic_dev_path *node;
@ -75,7 +75,7 @@ validate_device_path(struct efi_variable *var, int match, u8 *buffer,
}
static bool
validate_boot_order(struct efi_variable *var, int match, u8 *buffer,
validate_boot_order(efi_char16_t *var_name, int match, u8 *buffer,
unsigned long len)
{
/* An array of 16-bit integers */
@ -86,18 +86,18 @@ validate_boot_order(struct efi_variable *var, int match, u8 *buffer,
}
static bool
validate_load_option(struct efi_variable *var, int match, u8 *buffer,
validate_load_option(efi_char16_t *var_name, int match, u8 *buffer,
unsigned long len)
{
u16 filepathlength;
int i, desclength = 0, namelen;
namelen = ucs2_strnlen(var->VariableName, sizeof(var->VariableName));
namelen = ucs2_strnlen(var_name, EFI_VAR_NAME_LEN);
/* Either "Boot" or "Driver" followed by four digits of hex */
for (i = match; i < match+4; i++) {
if (var->VariableName[i] > 127 ||
hex_to_bin(var->VariableName[i] & 0xff) < 0)
if (var_name[i] > 127 ||
hex_to_bin(var_name[i] & 0xff) < 0)
return true;
}
@ -132,12 +132,12 @@ validate_load_option(struct efi_variable *var, int match, u8 *buffer,
/*
* And, finally, check the filepath
*/
return validate_device_path(var, match, buffer + desclength + 6,
return validate_device_path(var_name, match, buffer + desclength + 6,
filepathlength);
}
static bool
validate_uint16(struct efi_variable *var, int match, u8 *buffer,
validate_uint16(efi_char16_t *var_name, int match, u8 *buffer,
unsigned long len)
{
/* A single 16-bit integer */
@ -148,7 +148,7 @@ validate_uint16(struct efi_variable *var, int match, u8 *buffer,
}
static bool
validate_ascii_string(struct efi_variable *var, int match, u8 *buffer,
validate_ascii_string(efi_char16_t *var_name, int match, u8 *buffer,
unsigned long len)
{
int i;
@ -166,7 +166,7 @@ validate_ascii_string(struct efi_variable *var, int match, u8 *buffer,
struct variable_validate {
char *name;
bool (*validate)(struct efi_variable *var, int match, u8 *data,
bool (*validate)(efi_char16_t *var_name, int match, u8 *data,
unsigned long len);
};
@ -189,10 +189,10 @@ static const struct variable_validate variable_validate[] = {
};
bool
efivar_validate(struct efi_variable *var, u8 *data, unsigned long len)
efivar_validate(efi_char16_t *var_name, u8 *data, unsigned long len)
{
int i;
u16 *unicode_name = var->VariableName;
u16 *unicode_name = var_name;
for (i = 0; variable_validate[i].validate != NULL; i++) {
const char *name = variable_validate[i].name;
@ -208,7 +208,7 @@ efivar_validate(struct efi_variable *var, u8 *data, unsigned long len)
/* Wildcard in the matching name means we've matched */
if (c == '*')
return variable_validate[i].validate(var,
return variable_validate[i].validate(var_name,
match, data, len);
/* Case sensitive match */
@ -217,7 +217,7 @@ efivar_validate(struct efi_variable *var, u8 *data, unsigned long len)
/* Reached the end of the string while matching */
if (!c)
return variable_validate[i].validate(var,
return variable_validate[i].validate(var_name,
match, data, len);
}
}
@ -805,7 +805,7 @@ int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
*set = false;
if (efivar_validate(&entry->var, data, *size) == false)
if (efivar_validate(name, data, *size) == false)
return -EINVAL;
/*

12
include/linux/efi.h
View File

@ -863,6 +863,12 @@ extern int efi_set_rtc_mmss(const struct timespec *now);
extern void efi_reserve_boot_services(void);
extern struct efi_memory_map memmap;
/* Iterate through an efi_memory_map */
#define for_each_efi_memory_desc(m, md) \
for ((md) = (m)->map; \
(md) <= (efi_memory_desc_t *)((m)->map_end - (m)->desc_size); \
(md) = (void *)(md) + (m)->desc_size)
/**
* efi_range_is_wc - check the WC bit on an address range
* @start: starting kvirt address
@ -1033,8 +1039,10 @@ struct efivars {
* and we use a page for reading/writing.
*/
#define EFI_VAR_NAME_LEN 1024
struct efi_variable {
efi_char16_t VariableName[1024/sizeof(efi_char16_t)];
efi_char16_t VariableName[EFI_VAR_NAME_LEN/sizeof(efi_char16_t)];
efi_guid_t VendorGuid;
unsigned long DataSize;
__u8 Data[1024];
@ -1116,7 +1124,7 @@ int efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
struct efivar_entry *efivar_entry_find(efi_char16_t *name, efi_guid_t guid,
struct list_head *head, bool remove);
bool efivar_validate(struct efi_variable *var, u8 *data, unsigned long len);
bool efivar_validate(efi_char16_t *var_name, u8 *data, unsigned long len);
extern struct work_struct efivar_work;
void efivar_run_worker(void);