@@ -74,6 +74,11 @@ LDFLAGS_vmlinux += -z noexecstack
ifeq ($(CONFIG_LD_IS_BFD),y)
LDFLAGS_vmlinux += $(call ld-option,--no-warn-rwx-segments)
endif
+ifeq ($(CONFIG_EFI_STUB),y)
+# ensure that the static EFI stub library will be pulled in, even if it is
+# never referenced explicitly from the startup code
+LDFLAGS_vmlinux += -u efi_pe_entry
+endif
LDFLAGS_vmlinux += -T
hostprogs := mkpiggy
@@ -269,10 +269,6 @@ SYM_FUNC_START_LOCAL(efi32_entry)
jmp startup_32
SYM_FUNC_END(efi32_entry)
-#define ST32_boottime 60 // offsetof(efi_system_table_32_t, boottime)
-#define BS32_handle_protocol 88 // offsetof(efi_boot_services_32_t, handle_protocol)
-#define LI32_image_base 32 // offsetof(efi_loaded_image_32_t, image_base)
-
/*
* efi_status_t efi32_pe_entry(efi_handle_t image_handle,
* efi_system_table_32_t *sys_table)
@@ -280,8 +276,6 @@ SYM_FUNC_END(efi32_entry)
SYM_FUNC_START(efi32_pe_entry)
pushl %ebp
movl %esp, %ebp
- pushl %eax // dummy push to allocate loaded_image
-
pushl %ebx // save callee-save registers
pushl %edi
@@ -290,48 +284,8 @@ SYM_FUNC_START(efi32_pe_entry)
movl $0x80000003, %eax // EFI_UNSUPPORTED
jnz 2f
- call 1f
-1: pop %ebx
-
- /* Get the loaded image protocol pointer from the image handle */
- leal -4(%ebp), %eax
- pushl %eax // &loaded_image
- leal (loaded_image_proto - 1b)(%ebx), %eax
- pushl %eax // pass the GUID address
- pushl 8(%ebp) // pass the image handle
-
- /*
- * Note the alignment of the stack frame.
- * sys_table
- * handle <-- 16-byte aligned on entry by ABI
- * return address
- * frame pointer
- * loaded_image <-- local variable
- * saved %ebx <-- 16-byte aligned here
- * saved %edi
- * &loaded_image
- * &loaded_image_proto
- * handle <-- 16-byte aligned for call to handle_protocol
- */
-
- movl 12(%ebp), %eax // sys_table
- movl ST32_boottime(%eax), %eax // sys_table->boottime
- call *BS32_handle_protocol(%eax) // sys_table->boottime->handle_protocol
- addl $12, %esp // restore argument space
- testl %eax, %eax
- jnz 2f
-
movl 8(%ebp), %ecx // image_handle
movl 12(%ebp), %edx // sys_table
- movl -4(%ebp), %esi // loaded_image
- movl LI32_image_base(%esi), %esi // loaded_image->image_base
- leal (startup_32 - 1b)(%ebx), %ebp // runtime address of startup_32
- /*
- * We need to set the image_offset variable here since startup_32() will
- * use it before we get to the 64-bit efi_pe_entry() in C code.
- */
- subl %esi, %ebp // calculate image_offset
- movl %ebp, (image_offset - 1b)(%ebx) // save image_offset
xorl %esi, %esi
jmp efi32_entry // pass %ecx, %edx, %esi
// no other registers remain live
@@ -350,15 +304,6 @@ SYM_FUNC_START_NOALIGN(efi64_stub_entry)
SYM_FUNC_END(efi64_stub_entry)
#endif
- .section ".rodata"
- /* EFI loaded image protocol GUID */
- .balign 4
-SYM_DATA_START_LOCAL(loaded_image_proto)
- .long 0x5b1b31a1
- .word 0x9562, 0x11d2
- .byte 0x8e, 0x3f, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b
-SYM_DATA_END(loaded_image_proto)
-
.data
.balign 8
SYM_DATA_START_LOCAL(efi32_boot_gdt)
@@ -84,19 +84,6 @@ SYM_FUNC_START(startup_32)
#ifdef CONFIG_RELOCATABLE
leal startup_32@GOTOFF(%edx), %ebx
-
-#ifdef CONFIG_EFI_STUB
-/*
- * If we were loaded via the EFI LoadImage service, startup_32() will be at an
- * offset to the start of the space allocated for the image. efi_pe_entry() will
- * set up image_offset to tell us where the image actually starts, so that we
- * can use the full available buffer.
- * image_offset = startup_32 - image_base
- * Otherwise image_offset will be zero and has no effect on the calculations.
- */
- subl image_offset@GOTOFF(%edx), %ebx
-#endif
-
movl BP_kernel_alignment(%esi), %eax
decl %eax
addl %eax, %ebx
@@ -146,19 +146,6 @@ SYM_FUNC_START(startup_32)
#ifdef CONFIG_RELOCATABLE
movl %ebp, %ebx
-
-#ifdef CONFIG_EFI_STUB
-/*
- * If we were loaded via the EFI LoadImage service, startup_32 will be at an
- * offset to the start of the space allocated for the image. efi_pe_entry will
- * set up image_offset to tell us where the image actually starts, so that we
- * can use the full available buffer.
- * image_offset = startup_32 - image_base
- * Otherwise image_offset will be zero and has no effect on the calculations.
- */
- subl rva(image_offset)(%ebp), %ebx
-#endif
-
movl BP_kernel_alignment(%esi), %eax
decl %eax
addl %eax, %ebx
@@ -335,20 +322,6 @@ SYM_CODE_START(startup_64)
/* Start with the delta to where the kernel will run at. */
#ifdef CONFIG_RELOCATABLE
leaq startup_32(%rip) /* - $startup_32 */, %rbp
-
-#ifdef CONFIG_EFI_STUB
-/*
- * If we were loaded via the EFI LoadImage service, startup_32 will be at an
- * offset to the start of the space allocated for the image. efi_pe_entry will
- * set up image_offset to tell us where the image actually starts, so that we
- * can use the full available buffer.
- * image_offset = startup_32 - image_base
- * Otherwise image_offset will be zero and has no effect on the calculations.
- */
- movl image_offset(%rip), %eax
- subq %rax, %rbp
-#endif
-
movl BP_kernel_alignment(%rsi), %eax
decl %eax
addq %rax, %rbp
@@ -90,6 +90,8 @@ static inline void efi_fpu_end(void)
}
#ifdef CONFIG_X86_32
+#define EFI_X86_KERNEL_ALLOC_LIMIT (SZ_512M - 1)
+
#define arch_efi_call_virt_setup() \
({ \
efi_fpu_begin(); \
@@ -103,8 +105,7 @@ static inline void efi_fpu_end(void)
})
#else /* !CONFIG_X86_32 */
-
-#define EFI_LOADER_SIGNATURE "EL64"
+#define EFI_X86_KERNEL_ALLOC_LIMIT EFI_ALLOC_LIMIT
extern asmlinkage u64 __efi_call(void *fp, ...);
@@ -218,6 +219,8 @@ efi_status_t efi_set_virtual_address_map(unsigned long memory_map_size,
#ifdef CONFIG_EFI_MIXED
+#define EFI_ALLOC_LIMIT (efi_is_64bit() ? ULONG_MAX : U32_MAX)
+
#define ARCH_HAS_EFISTUB_WRAPPERS
static inline bool efi_is_64bit(void)
@@ -161,6 +161,7 @@ static __always_inline void sev_es_nmi_complete(void)
__sev_es_nmi_complete();
}
extern int __init sev_es_efi_map_ghcbs(pgd_t *pgd);
+extern void sev_enable(struct boot_params *bp);
static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs)
{
@@ -215,6 +216,7 @@ static inline void sev_es_ist_exit(void) { }
static inline int sev_es_setup_ap_jump_table(struct real_mode_header *rmh) { return 0; }
static inline void sev_es_nmi_complete(void) { }
static inline int sev_es_efi_map_ghcbs(pgd_t *pgd) { return 0; }
+static inline void sev_enable(struct boot_params *bp) { }
static inline int pvalidate(unsigned long vaddr, bool rmp_psize, bool validate) { return 0; }
static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned long attrs) { return 0; }
static inline void setup_ghcb(void) { }
@@ -15,17 +15,14 @@
#include <asm/setup.h>
#include <asm/desc.h>
#include <asm/boot.h>
+#include <asm/kaslr.h>
#include <asm/sev.h>
#include "efistub.h"
#include "x86-stub.h"
-/* Maximum physical address for 64-bit kernel with 4-level paging */
-#define MAXMEM_X86_64_4LEVEL (1ull << 46)
-
const efi_system_table_t *efi_system_table;
const efi_dxe_services_table_t *efi_dxe_table;
-u32 image_offset __section(".data");
static efi_loaded_image_t *image = NULL;
static efi_memory_attribute_protocol_t *memattr;
@@ -287,28 +284,6 @@ void efi_adjust_memory_range_protection(unsigned long start,
}
}
-void startup_32(struct boot_params *boot_params);
-
-static void
-setup_memory_protection(unsigned long image_base, unsigned long image_size)
-{
-#ifdef CONFIG_64BIT
- if (image_base != (unsigned long)startup_32)
- efi_adjust_memory_range_protection(image_base, image_size);
-#else
- /*
- * Clear protection flags on a whole range of possible
- * addresses used for KASLR. We don't need to do that
- * on x86_64, since KASLR/extraction is performed after
- * dedicated identity page tables are built and we only
- * need to remove possible protection on relocated image
- * itself disregarding further relocations.
- */
- efi_adjust_memory_range_protection(LOAD_PHYSICAL_ADDR,
- KERNEL_IMAGE_SIZE - LOAD_PHYSICAL_ADDR);
-#endif
-}
-
static void setup_unaccepted_memory(void)
{
efi_guid_t mem_acceptance_proto = OVMF_SEV_MEMORY_ACCEPTANCE_PROTOCOL_GUID;
@@ -334,9 +309,7 @@ static void setup_unaccepted_memory(void)
static const efi_char16_t apple[] = L"Apple";
-static void setup_quirks(struct boot_params *boot_params,
- unsigned long image_base,
- unsigned long image_size)
+static void setup_quirks(struct boot_params *boot_params)
{
efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long)
efi_table_attr(efi_system_table, fw_vendor);
@@ -345,9 +318,6 @@ static void setup_quirks(struct boot_params *boot_params,
if (IS_ENABLED(CONFIG_APPLE_PROPERTIES))
retrieve_apple_device_properties(boot_params);
}
-
- if (IS_ENABLED(CONFIG_EFI_DXE_MEM_ATTRIBUTES))
- setup_memory_protection(image_base, image_size);
}
/*
@@ -500,7 +470,6 @@ efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
}
image_base = efi_table_attr(image, image_base);
- image_offset = (void *)startup_32 - image_base;
status = efi_allocate_pages(sizeof(struct boot_params),
(unsigned long *)&boot_params, ULONG_MAX);
@@ -804,6 +773,61 @@ static bool have_unsupported_snp_features(void)
return false;
}
+static void efi_get_seed(void *seed, int size)
+{
+ efi_get_random_bytes(size, seed);
+
+ /*
+ * This only updates seed[0] when running on 32-bit, but in that case,
+ * seed[1] is not used anyway, as there is no virtual KASLR on 32-bit.
+ */
+ *(unsigned long *)seed ^= kaslr_get_random_long("EFI");
+}
+
+static void error(char *str)
+{
+ efi_warn("Decompression failed: %s\n", str);
+}
+
+static efi_status_t efi_decompress_kernel(unsigned long *kernel_entry)
+{
+ unsigned long virt_addr = LOAD_PHYSICAL_ADDR;
+ unsigned long addr, alloc_size, entry;
+ efi_status_t status;
+ u32 seed[2] = {};
+
+ /* determine the required size of the allocation */
+ alloc_size = ALIGN(max((unsigned long)output_len, kernel_total_size),
+ MIN_KERNEL_ALIGN);
+
+ if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && !efi_nokaslr) {
+ u64 range = KERNEL_IMAGE_SIZE - LOAD_PHYSICAL_ADDR - kernel_total_size;
+
+ efi_get_seed(seed, sizeof(seed));
+
+ virt_addr += (range * seed[1]) >> 32;
+ virt_addr &= ~(CONFIG_PHYSICAL_ALIGN - 1);
+ }
+
+ status = efi_random_alloc(alloc_size, CONFIG_PHYSICAL_ALIGN, &addr,
+ seed[0], EFI_LOADER_CODE,
+ EFI_X86_KERNEL_ALLOC_LIMIT);
+ if (status != EFI_SUCCESS)
+ return status;
+
+ entry = decompress_kernel((void *)addr, virt_addr, error);
+ if (entry == ULONG_MAX) {
+ efi_free(alloc_size, addr);
+ return EFI_LOAD_ERROR;
+ }
+
+ *kernel_entry = addr + entry;
+
+ efi_adjust_memory_range_protection(addr, kernel_total_size);
+
+ return EFI_SUCCESS;
+}
+
static void __noreturn enter_kernel(unsigned long kernel_addr,
struct boot_params *boot_params)
{
@@ -823,10 +847,9 @@ void __noreturn efi_stub_entry(efi_handle_t handle,
struct boot_params *boot_params)
{
efi_guid_t guid = EFI_MEMORY_ATTRIBUTE_PROTOCOL_GUID;
- unsigned long bzimage_addr = (unsigned long)startup_32;
- unsigned long buffer_start, buffer_end;
struct setup_header *hdr = &boot_params->hdr;
const struct linux_efi_initrd *initrd = NULL;
+ unsigned long kernel_entry;
efi_status_t status;
efi_system_table = sys_table_arg;
@@ -855,60 +878,6 @@ void __noreturn efi_stub_entry(efi_handle_t handle,
goto fail;
}
- /*
- * If the kernel isn't already loaded at a suitable address,
- * relocate it.
- *
- * It must be loaded above LOAD_PHYSICAL_ADDR.
- *
- * The maximum address for 64-bit is 1 << 46 for 4-level paging. This
- * is defined as the macro MAXMEM, but unfortunately that is not a
- * compile-time constant if 5-level paging is configured, so we instead
- * define our own macro for use here.
- *
- * For 32-bit, the maximum address is complicated to figure out, for
- * now use KERNEL_IMAGE_SIZE, which will be 512MiB, the same as what
- * KASLR uses.
- *
- * Also relocate it if image_offset is zero, i.e. the kernel wasn't
- * loaded by LoadImage, but rather by a bootloader that called the
- * handover entry. The reason we must always relocate in this case is
- * to handle the case of systemd-boot booting a unified kernel image,
- * which is a PE executable that contains the bzImage and an initrd as
- * COFF sections. The initrd section is placed after the bzImage
- * without ensuring that there are at least init_size bytes available
- * for the bzImage, and thus the compressed kernel's startup code may
- * overwrite the initrd unless it is moved out of the way.
- */
-
- buffer_start = ALIGN(bzimage_addr - image_offset,
- hdr->kernel_alignment);
- buffer_end = buffer_start + hdr->init_size;
-
- if ((buffer_start < LOAD_PHYSICAL_ADDR) ||
- (IS_ENABLED(CONFIG_X86_32) && buffer_end > KERNEL_IMAGE_SIZE) ||
- (IS_ENABLED(CONFIG_X86_64) && buffer_end > MAXMEM_X86_64_4LEVEL) ||
- (image_offset == 0)) {
- extern char _bss[];
-
- status = efi_relocate_kernel(&bzimage_addr,
- (unsigned long)_bss - bzimage_addr,
- hdr->init_size,
- hdr->pref_address,
- hdr->kernel_alignment,
- LOAD_PHYSICAL_ADDR);
- if (status != EFI_SUCCESS) {
- efi_err("efi_relocate_kernel() failed!\n");
- goto fail;
- }
- /*
- * Now that we've copied the kernel elsewhere, we no longer
- * have a set up block before startup_32(), so reset image_offset
- * to zero in case it was set earlier.
- */
- image_offset = 0;
- }
-
#ifdef CONFIG_CMDLINE_BOOL
status = efi_parse_options(CONFIG_CMDLINE);
if (status != EFI_SUCCESS) {
@@ -926,6 +895,12 @@ void __noreturn efi_stub_entry(efi_handle_t handle,
}
}
+ status = efi_decompress_kernel(&kernel_entry);
+ if (status != EFI_SUCCESS) {
+ efi_err("Failed to decompress kernel\n");
+ goto fail;
+ }
+
/*
* At this point, an initrd may already have been loaded by the
* bootloader and passed via bootparams. We permit an initrd loaded
@@ -965,7 +940,7 @@ void __noreturn efi_stub_entry(efi_handle_t handle,
setup_efi_pci(boot_params);
- setup_quirks(boot_params, bzimage_addr, buffer_end - buffer_start);
+ setup_quirks(boot_params);
setup_unaccepted_memory();
@@ -975,13 +950,15 @@ void __noreturn efi_stub_entry(efi_handle_t handle,
goto fail;
}
+ /*
+ * Call the SEV init code while still running with the firmware's
+ * GDT/IDT, so #VC exceptions will be handled by EFI.
+ */
+ sev_enable(boot_params);
+
efi_5level_switch();
- if (IS_ENABLED(CONFIG_X86_64))
- /* add offset of startup_64() */
- bzimage_addr += 0x200;
-
- enter_kernel(bzimage_addr, boot_params);
+ enter_kernel(kernel_entry, boot_params);
fail:
efi_err("efi_stub_entry() failed!\n");