Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Ard Biesheuvel | 553 | 93.41% | 15 | 83.33% |
Matt Fleming | 37 | 6.25% | 2 | 11.11% |
Matthew Garrett | 2 | 0.34% | 1 | 5.56% |
Total | 592 | 18 |
// SPDX-License-Identifier: GPL-2.0 #include <linux/efi.h> #include <linux/pe.h> #include <asm/efi.h> #include <asm/unaligned.h> #include "efistub.h" static unsigned char zboot_heap[SZ_256K] __aligned(64); static unsigned long free_mem_ptr, free_mem_end_ptr; #define STATIC static #if defined(CONFIG_KERNEL_GZIP) #include "../../../../lib/decompress_inflate.c" #elif defined(CONFIG_KERNEL_LZ4) #include "../../../../lib/decompress_unlz4.c" #elif defined(CONFIG_KERNEL_LZMA) #include "../../../../lib/decompress_unlzma.c" #elif defined(CONFIG_KERNEL_LZO) #include "../../../../lib/decompress_unlzo.c" #elif defined(CONFIG_KERNEL_XZ) #undef memcpy #define memcpy memcpy #undef memmove #define memmove memmove #include "../../../../lib/decompress_unxz.c" #elif defined(CONFIG_KERNEL_ZSTD) #include "../../../../lib/decompress_unzstd.c" #endif extern char efi_zboot_header[]; extern char _gzdata_start[], _gzdata_end[]; static void error(char *x) { efi_err("EFI decompressor: %s\n", x); } static unsigned long alloc_preferred_address(unsigned long alloc_size) { #ifdef EFI_KIMG_PREFERRED_ADDRESS efi_physical_addr_t efi_addr = EFI_KIMG_PREFERRED_ADDRESS; if (efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA, alloc_size / EFI_PAGE_SIZE, &efi_addr) == EFI_SUCCESS) return efi_addr; #endif return ULONG_MAX; } void __weak efi_cache_sync_image(unsigned long image_base, unsigned long alloc_size) { // Provided by the arch to perform the cache maintenance necessary for // executable code loaded into memory to be safe for execution. } struct screen_info *alloc_screen_info(void) { return __alloc_screen_info(); } asmlinkage efi_status_t __efiapi efi_zboot_entry(efi_handle_t handle, efi_system_table_t *systab) { unsigned long compressed_size = _gzdata_end - _gzdata_start; unsigned long image_base, alloc_size; efi_loaded_image_t *image; efi_status_t status; char *cmdline_ptr; int ret; WRITE_ONCE(efi_system_table, systab); free_mem_ptr = (unsigned long)&zboot_heap; free_mem_end_ptr = free_mem_ptr + sizeof(zboot_heap); status = efi_bs_call(handle_protocol, handle, &LOADED_IMAGE_PROTOCOL_GUID, (void **)&image); if (status != EFI_SUCCESS) { error("Failed to locate parent's loaded image protocol"); return status; } status = efi_handle_cmdline(image, &cmdline_ptr); if (status != EFI_SUCCESS) return status; efi_info("Decompressing Linux Kernel...\n"); // SizeOfImage from the compressee's PE/COFF header alloc_size = round_up(get_unaligned_le32(_gzdata_end - 4), EFI_ALLOC_ALIGN); // If the architecture has a preferred address for the image, // try that first. image_base = alloc_preferred_address(alloc_size); if (image_base == ULONG_MAX) { unsigned long min_kimg_align = efi_get_kimg_min_align(); u32 seed = U32_MAX; if (!IS_ENABLED(CONFIG_RANDOMIZE_BASE)) { // Setting the random seed to 0x0 is the same as // allocating as low as possible seed = 0; } else if (efi_nokaslr) { efi_info("KASLR disabled on kernel command line\n"); } else { status = efi_get_random_bytes(sizeof(seed), (u8 *)&seed); if (status == EFI_NOT_FOUND) { efi_info("EFI_RNG_PROTOCOL unavailable\n"); efi_nokaslr = true; } else if (status != EFI_SUCCESS) { efi_err("efi_get_random_bytes() failed (0x%lx)\n", status); efi_nokaslr = true; } } status = efi_random_alloc(alloc_size, min_kimg_align, &image_base, seed, EFI_LOADER_CODE, 0, EFI_ALLOC_LIMIT); if (status != EFI_SUCCESS) { efi_err("Failed to allocate memory\n"); goto free_cmdline; } } // Decompress the payload into the newly allocated buffer. ret = __decompress(_gzdata_start, compressed_size, NULL, NULL, (void *)image_base, alloc_size, NULL, error); if (ret < 0) { error("Decompression failed"); status = EFI_DEVICE_ERROR; goto free_image; } efi_cache_sync_image(image_base, alloc_size); status = efi_stub_common(handle, image, image_base, cmdline_ptr); free_image: efi_free(alloc_size, image_base); free_cmdline: efi_bs_call(free_pool, cmdline_ptr); return status; }
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with Cregit http://github.com/cregit/cregit
Version 2.0-RC1