From 6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 18:29:51 +0200 Subject: Adding upstream version 2.06. Signed-off-by: Daniel Baumann --- grub-core/loader/i386/xen_file.c | 117 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 117 insertions(+) create mode 100644 grub-core/loader/i386/xen_file.c (limited to 'grub-core/loader/i386/xen_file.c') diff --git a/grub-core/loader/i386/xen_file.c b/grub-core/loader/i386/xen_file.c new file mode 100644 index 0000000..9af5d66 --- /dev/null +++ b/grub-core/loader/i386/xen_file.c @@ -0,0 +1,117 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2013 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see . + */ + +#include +#include +#include + +#define XZ_MAGIC "\3757zXZ\0" + +grub_elf_t +grub_xen_file (grub_file_t file) +{ + grub_elf_t elf; + struct linux_i386_kernel_header lh; + grub_file_t off_file; + grub_uint32_t payload_offset, payload_length; + grub_uint8_t magic[6]; + + elf = grub_elf_file (file, file->name); + if (elf) + return elf; + grub_errno = GRUB_ERR_NONE; + + if (grub_file_seek (file, 0) == (grub_off_t) -1) + goto fail; + + if (grub_file_read (file, &lh, sizeof (lh)) != sizeof (lh)) + goto fail; + + if (lh.boot_flag != grub_cpu_to_le16_compile_time (0xaa55) + || lh.header != grub_cpu_to_le32_compile_time (GRUB_LINUX_I386_MAGIC_SIGNATURE) + || grub_le_to_cpu16 (lh.version) < 0x0208) + { + grub_error (GRUB_ERR_BAD_OS, "version too old for xen boot"); + return NULL; + } + + payload_length = lh.payload_length; + payload_offset = (lh.setup_sects + 1) * 512 + + lh.payload_offset; + + if (payload_length < sizeof (magic)) + { + grub_error (GRUB_ERR_BAD_OS, "payload too short"); + return NULL; + } + + grub_dprintf ("xen", "found bzimage payload 0x%llx-0x%llx\n", + (unsigned long long) payload_offset, + (unsigned long long) lh.payload_length); + + grub_file_seek (file, payload_offset); + + if (grub_file_read (file, &magic, sizeof (magic)) != sizeof (magic)) + { + if (!grub_errno) + grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), + file->name); + goto fail; + } + + /* Kernel suffixes xz payload with their uncompressed size. + Trim it. */ + if (grub_memcmp (magic, XZ_MAGIC, sizeof (XZ_MAGIC) - 1) == 0) + payload_length -= 4; + off_file = grub_file_offset_open (file, GRUB_FILE_TYPE_LINUX_KERNEL, payload_offset, + payload_length); + if (!off_file) + goto fail; + + elf = grub_elf_file (off_file, file->name); + if (elf) + return elf; + grub_file_offset_close (off_file); + +fail: + grub_error (GRUB_ERR_BAD_OS, "not xen image"); + return NULL; +} + +grub_err_t +grub_xen_get_info (grub_elf_t elf, struct grub_xen_file_info * xi) +{ + grub_memset (xi, 0, sizeof (*xi)); + + if (grub_elf_is_elf64 (elf) + && elf->ehdr.ehdr64.e_machine + == grub_cpu_to_le16_compile_time (EM_X86_64) + && elf->ehdr.ehdr64.e_ident[EI_DATA] == ELFDATA2LSB) + { + xi->arch = GRUB_XEN_FILE_X86_64; + return grub_xen_get_info64 (elf, xi); + } + if (grub_elf_is_elf32 (elf) + && elf->ehdr.ehdr32.e_machine == grub_cpu_to_le16_compile_time (EM_386) + && elf->ehdr.ehdr32.e_ident[EI_DATA] == ELFDATA2LSB) + { + xi->arch = GRUB_XEN_FILE_I386; + return grub_xen_get_info32 (elf, xi); + } + return grub_error (GRUB_ERR_BAD_OS, "unknown ELF type"); +} -- cgit v1.2.3