2ddbfc81ea
This implements efi_random_alloc(), which allocates a chunk of memory of a certain size at a certain alignment, and uses the random_seed argument it receives to randomize the address of the allocation. This is implemented by iterating over the UEFI memory map, counting the number of suitable slots (aligned offsets) within each region, and picking a random number between 0 and 'number of slots - 1' to select the slot, This should guarantee that each possible offset is chosen equally likely. Suggested-by: Kees Cook <keescook@chromium.org> Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
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#ifndef _DRIVERS_FIRMWARE_EFI_EFISTUB_H
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#define _DRIVERS_FIRMWARE_EFI_EFISTUB_H
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/* error code which can't be mistaken for valid address */
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#define EFI_ERROR (~0UL)
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void efi_char16_printk(efi_system_table_t *, efi_char16_t *);
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efi_status_t efi_open_volume(efi_system_table_t *sys_table_arg, void *__image,
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void **__fh);
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efi_status_t efi_file_size(efi_system_table_t *sys_table_arg, void *__fh,
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efi_char16_t *filename_16, void **handle,
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u64 *file_sz);
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efi_status_t efi_file_read(void *handle, unsigned long *size, void *addr);
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efi_status_t efi_file_close(void *handle);
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unsigned long get_dram_base(efi_system_table_t *sys_table_arg);
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efi_status_t update_fdt(efi_system_table_t *sys_table, void *orig_fdt,
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unsigned long orig_fdt_size,
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void *fdt, int new_fdt_size, char *cmdline_ptr,
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u64 initrd_addr, u64 initrd_size,
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efi_memory_desc_t *memory_map,
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unsigned long map_size, unsigned long desc_size,
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u32 desc_ver);
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efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table,
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void *handle,
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unsigned long *new_fdt_addr,
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unsigned long max_addr,
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u64 initrd_addr, u64 initrd_size,
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char *cmdline_ptr,
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unsigned long fdt_addr,
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unsigned long fdt_size);
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void *get_fdt(efi_system_table_t *sys_table, unsigned long *fdt_size);
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void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size,
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unsigned long desc_size, efi_memory_desc_t *runtime_map,
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int *count);
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efi_status_t efi_get_random_bytes(efi_system_table_t *sys_table,
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unsigned long size, u8 *out);
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efi_status_t efi_random_alloc(efi_system_table_t *sys_table_arg,
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unsigned long size, unsigned long align,
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unsigned long *addr, unsigned long random_seed);
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#endif
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