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* Enforce CONFIG_RELOCATABLE for the x86 EFI boot stub, otherwise

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it's possible to overwrite random pieces of unallocated memory during
    kernel decompression, leading to machine resets.
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Merge tag 'efi-urgent' into x86/efi

 * Enforce CONFIG_RELOCATABLE for the x86 EFI boot stub, otherwise
   it's possible to overwrite random pieces of unallocated memory during
   kernel decompression, leading to machine resets.

Resolved Conflicts:
	arch/x86/Kconfig

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
H. Peter Anvin 2014-08-11 13:58:54 -07:00
commit 9e13bcf7e0
6 changed files with 73 additions and 24 deletions
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1
arch/x86/Kconfig
View File

@ -1537,6 +1537,7 @@ config EFI
config EFI_STUB
bool "EFI stub support"
depends on EFI && !X86_USE_3DNOW
select RELOCATABLE
---help---
This kernel feature allows a bzImage to be loaded directly
by EFI firmware without the use of a bootloader.

26
arch/x86/boot/header.S
View File

@ -91,10 +91,9 @@ bs_die:
.section ".bsdata", "a"
bugger_off_msg:
.ascii "Direct floppy boot is not supported. "
.ascii "Use a boot loader program instead.\r\n"
.ascii "Use a boot loader.\r\n"
.ascii "\n"
.ascii "Remove disk and press any key to reboot ...\r\n"
.ascii "Remove disk and press any key to reboot...\r\n"
.byte 0
#ifdef CONFIG_EFI_STUB
@ -108,7 +107,7 @@ coff_header:
#else
.word 0x8664 # x86-64
#endif
.word 3 # nr_sections
.word 4 # nr_sections
.long 0 # TimeDateStamp
.long 0 # PointerToSymbolTable
.long 1 # NumberOfSymbols
@ -250,6 +249,25 @@ section_table:
.word 0 # NumberOfLineNumbers
.long 0x60500020 # Characteristics (section flags)
#
# The offset & size fields are filled in by build.c.
#
.ascii ".bss"
.byte 0
.byte 0
.byte 0
.byte 0
.long 0
.long 0x0
.long 0 # Size of initialized data
# on disk
.long 0x0
.long 0 # PointerToRelocations
.long 0 # PointerToLineNumbers
.word 0 # NumberOfRelocations
.word 0 # NumberOfLineNumbers
.long 0xc8000080 # Characteristics (section flags)
#endif /* CONFIG_EFI_STUB */
# Kernel attributes; used by setup. This is part 1 of the

38
arch/x86/boot/tools/build.c
View File

@ -143,7 +143,7 @@ static void usage(void)
#ifdef CONFIG_EFI_STUB
static void update_pecoff_section_header(char *section_name, u32 offset, u32 size)
static void update_pecoff_section_header_fields(char *section_name, u32 vma, u32 size, u32 datasz, u32 offset)
{
unsigned int pe_header;
unsigned short num_sections;
@ -164,10 +164,10 @@ static void update_pecoff_section_header(char *section_name, u32 offset, u32 siz
put_unaligned_le32(size, section + 0x8);
/* section header vma field */
put_unaligned_le32(offset, section + 0xc);
put_unaligned_le32(vma, section + 0xc);
/* section header 'size of initialised data' field */
put_unaligned_le32(size, section + 0x10);
put_unaligned_le32(datasz, section + 0x10);
/* section header 'file offset' field */
put_unaligned_le32(offset, section + 0x14);
@ -179,6 +179,11 @@ static void update_pecoff_section_header(char *section_name, u32 offset, u32 siz
}
}
static void update_pecoff_section_header(char *section_name, u32 offset, u32 size)
{
update_pecoff_section_header_fields(section_name, offset, size, size, offset);
}
static void update_pecoff_setup_and_reloc(unsigned int size)
{
u32 setup_offset = 0x200;
@ -203,9 +208,6 @@ static void update_pecoff_text(unsigned int text_start, unsigned int file_sz)
pe_header = get_unaligned_le32(&buf[0x3c]);
/* Size of image */
put_unaligned_le32(file_sz, &buf[pe_header + 0x50]);
/*
* Size of code: Subtract the size of the first sector (512 bytes)
* which includes the header.
@ -220,6 +222,22 @@ static void update_pecoff_text(unsigned int text_start, unsigned int file_sz)
update_pecoff_section_header(".text", text_start, text_sz);
}
static void update_pecoff_bss(unsigned int file_sz, unsigned int init_sz)
{
unsigned int pe_header;
unsigned int bss_sz = init_sz - file_sz;
pe_header = get_unaligned_le32(&buf[0x3c]);
/* Size of uninitialized data */
put_unaligned_le32(bss_sz, &buf[pe_header + 0x24]);
/* Size of image */
put_unaligned_le32(init_sz, &buf[pe_header + 0x50]);
update_pecoff_section_header_fields(".bss", file_sz, bss_sz, 0, 0);
}
static int reserve_pecoff_reloc_section(int c)
{
/* Reserve 0x20 bytes for .reloc section */
@ -259,6 +277,8 @@ static void efi_stub_entry_update(void)
static inline void update_pecoff_setup_and_reloc(unsigned int size) {}
static inline void update_pecoff_text(unsigned int text_start,
unsigned int file_sz) {}
static inline void update_pecoff_bss(unsigned int file_sz,
unsigned int init_sz) {}
static inline void efi_stub_defaults(void) {}
static inline void efi_stub_entry_update(void) {}
@ -310,7 +330,7 @@ static void parse_zoffset(char *fname)
int main(int argc, char ** argv)
{
unsigned int i, sz, setup_sectors;
unsigned int i, sz, setup_sectors, init_sz;
int c;
u32 sys_size;
struct stat sb;
@ -376,7 +396,9 @@ int main(int argc, char ** argv)
buf[0x1f1] = setup_sectors-1;
put_unaligned_le32(sys_size, &buf[0x1f4]);
update_pecoff_text(setup_sectors * 512, sz + i + ((sys_size * 16) - sz));
update_pecoff_text(setup_sectors * 512, i + (sys_size * 16));
init_sz = get_unaligned_le32(&buf[0x260]);
update_pecoff_bss(i + (sys_size * 16), init_sz);
efi_stub_entry_update();

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

@ -40,7 +40,7 @@ struct pstore_read_data {
static inline u64 generic_id(unsigned long timestamp,
unsigned int part, int count)
{
return (timestamp * 100 + part) * 1000 + count;
return ((u64) timestamp * 100 + part) * 1000 + count;
}
static int efi_pstore_read_func(struct efivar_entry *entry, void *data)

28
drivers/firmware/efi/efi.c
View File

@ -364,6 +364,7 @@ static __initdata struct {
struct param_info {
int verbose;
int found;
void *params;
};
@ -371,25 +372,21 @@ static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
int depth, void *data)
{
struct param_info *info = data;
void *prop, *dest;
unsigned long len;
const void *prop;
void *dest;
u64 val;
int i;
int i, len;
if (depth != 1 ||
(strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
return 0;
pr_info("Getting parameters from FDT:\n");
for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len);
if (!prop) {
pr_err("Can't find %s in device tree!\n",
dt_params[i].name);
if (!prop)
return 0;
}
dest = info->params + dt_params[i].offset;
info->found++;
val = of_read_number(prop, len / sizeof(u32));
@ -408,10 +405,21 @@ static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
int __init efi_get_fdt_params(struct efi_fdt_params *params, int verbose)
{
struct param_info info;
int ret;
pr_info("Getting EFI parameters from FDT:\n");
info.verbose = verbose;
info.found = 0;
info.params = params;
return of_scan_flat_dt(fdt_find_uefi_params, &info);
ret = of_scan_flat_dt(fdt_find_uefi_params, &info);
if (!info.found)
pr_info("UEFI not found.\n");
else if (!ret)
pr_err("Can't find '%s' in device tree!\n",
dt_params[info.found].name);
return ret;
}
#endif /* CONFIG_EFI_PARAMS_FROM_FDT */

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

@ -57,7 +57,7 @@ efi_status_t update_fdt(efi_system_table_t *sys_table, void *orig_fdt,
*/
prev = 0;
for (;;) {
const char *type, *name;
const char *type;
int len;
node = fdt_next_node(fdt, prev, NULL);