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grub2/grub-core/commands/file.c
Vladimir Serbinenko b04c6d32ce commands/file: Change the confusing loop stop condition. 
Old condition was used to zero-out header variable on exit of the loop.
This is correct but confusing. Replace with in-loop logic.

Found by: Coverity Scan.
2015-01-24 20:47:41 +01:00

680 lines
17 KiB
C
Raw Blame History

/*
* 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 <http://www.gnu.org/licenses/>.
*/
#include <grub/dl.h>
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/env.h>
#include <grub/command.h>
#include <grub/extcmd.h>
#include <grub/i18n.h>
#include <grub/file.h>
#include <grub/elf.h>
#include <grub/xen_file.h>
#include <grub/efi/pe32.h>
#include <grub/i386/linux.h>
#include <grub/xnu.h>
#include <grub/machoload.h>
#include <grub/fileid.h>
GRUB_MOD_LICENSE ("GPLv3+");
static const struct grub_arg_option options[] = {
{"is-i386-xen-pae-domu", 0, 0,
N_("Check if FILE can be booted as i386 PAE Xen unprivileged guest kernel"),
0, 0},
{"is-x86_64-xen-domu", 0, 0,
N_("Check if FILE can be booted as x86_64 Xen unprivileged guest kernel"), 0, 0},
{"is-x86-xen-dom0", 0, 0,
N_("Check if FILE can be used as Xen x86 privileged guest kernel"), 0, 0},
{"is-x86-multiboot", 0, 0,
N_("Check if FILE can be used as x86 multiboot kernel"), 0, 0},
{"is-x86-multiboot2", 0, 0,
N_("Check if FILE can be used as x86 multiboot2 kernel"), 0, 0},
{"is-arm-linux", 0, 0,
N_("Check if FILE is ARM Linux"), 0, 0},
{"is-arm64-linux", 0, 0,
N_("Check if FILE is ARM64 Linux"), 0, 0},
{"is-ia64-linux", 0, 0,
N_("Check if FILE is IA64 Linux"), 0, 0},
{"is-mips-linux", 0, 0,
N_("Check if FILE is MIPS Linux"), 0, 0},
{"is-mipsel-linux", 0, 0,
N_("Check if FILE is MIPSEL Linux"), 0, 0},
{"is-sparc64-linux", 0, 0,
N_("Check if FILE is SPARC64 Linux"), 0, 0},
{"is-powerpc-linux", 0, 0,
N_("Check if FILE is POWERPC Linux"), 0, 0},
{"is-x86-linux", 0, 0,
N_("Check if FILE is x86 Linux"), 0, 0},
{"is-x86-linux32", 0, 0,
N_("Check if FILE is x86 Linux supporting 32-bit protocol"), 0, 0},
{"is-x86-kfreebsd", 0, 0,
N_("Check if FILE is x86 kFreeBSD"), 0, 0},
{"is-i386-kfreebsd", 0, 0,
N_("Check if FILE is i386 kFreeBSD"), 0, 0},
{"is-x86_64-kfreebsd", 0, 0,
N_("Check if FILE is x86_64 kFreeBSD"), 0, 0},
{"is-x86-knetbsd", 0, 0,
N_("Check if FILE is x86 kNetBSD"), 0, 0},
{"is-i386-knetbsd", 0, 0,
N_("Check if FILE is i386 kNetBSD"), 0, 0},
{"is-x86_64-knetbsd", 0, 0,
N_("Check if FILE is x86_64 kNetBSD"), 0, 0},
{"is-i386-efi", 0, 0,
N_("Check if FILE is i386 EFI file"), 0, 0},
{"is-x86_64-efi", 0, 0,
N_("Check if FILE is x86_64 EFI file"), 0, 0},
{"is-ia64-efi", 0, 0,
N_("Check if FILE is IA64 EFI file"), 0, 0},
{"is-arm64-efi", 0, 0,
N_("Check if FILE is ARM64 EFI file"), 0, 0},
{"is-arm-efi", 0, 0,
N_("Check if FILE is ARM EFI file"), 0, 0},
{"is-hibernated-hiberfil", 0, 0,
N_("Check if FILE is hiberfil.sys in hibernated state"), 0, 0},
{"is-x86_64-xnu", 0, 0,
N_("Check if FILE is x86_64 XNU (Mac OS X kernel)"), 0, 0},
{"is-i386-xnu", 0, 0,
N_("Check if FILE is i386 XNU (Mac OS X kernel)"), 0, 0},
{"is-xnu-hibr", 0, 0,
N_("Check if FILE is XNU (Mac OS X kernel) hibernated image"), 0, 0},
{"is-x86-bios-bootsector", 0, 0,
N_("Check if FILE is BIOS bootsector"), 0, 0},
{0, 0, 0, 0, 0, 0}
};
enum
{
IS_PAE_DOMU,
IS_64_DOMU,
IS_DOM0,
IS_MULTIBOOT,
IS_MULTIBOOT2,
IS_ARM_LINUX,
IS_ARM64_LINUX,
IS_IA64_LINUX,
IS_MIPS_LINUX,
IS_MIPSEL_LINUX,
IS_SPARC64_LINUX,
IS_POWERPC_LINUX,
IS_X86_LINUX,
IS_X86_LINUX32,
IS_X86_KFREEBSD,
IS_X86_KFREEBSD32,
IS_X86_KFREEBSD64,
IS_X86_KNETBSD,
IS_X86_KNETBSD32,
IS_X86_KNETBSD64,
IS_32_EFI,
IS_64_EFI,
IS_IA_EFI,
IS_ARM64_EFI,
IS_ARM_EFI,
IS_HIBERNATED,
IS_XNU64,
IS_XNU32,
IS_XNU_HIBR,
IS_BIOS_BOOTSECTOR,
OPT_TYPE_MIN = IS_PAE_DOMU,
OPT_TYPE_MAX = IS_BIOS_BOOTSECTOR
};
static grub_err_t
grub_cmd_file (grub_extcmd_context_t ctxt, int argc, char **args)
{
grub_file_t file = 0;
grub_elf_t elf = 0;
grub_err_t err;
int type = -1, i;
int ret = 0;
grub_macho_t macho = 0;
if (argc == 0)
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
for (i = OPT_TYPE_MIN; i <= OPT_TYPE_MAX; i++)
if (ctxt->state[i].set)
{
if (type == -1)
{
type = i;
continue;
}
return grub_error (GRUB_ERR_BAD_ARGUMENT, "multiple types specified");
}
if (type == -1)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "no type specified");
file = grub_file_open (args[0]);
if (!file)
return grub_errno;
switch (type)
{
case IS_BIOS_BOOTSECTOR:
{
grub_uint16_t sig;
if (grub_file_size (file) != 512)
break;
if (grub_file_seek (file, 510) == (grub_size_t) -1)
break;
if (grub_file_read (file, &sig, 2) != 2)
break;
if (sig != grub_cpu_to_le16_compile_time (0xaa55))
break;
ret = 1;
break;
}
case IS_IA64_LINUX:
{
Elf64_Ehdr ehdr;
if (grub_file_read (file, &ehdr, sizeof (ehdr)) != sizeof (ehdr))
break;
if (ehdr.e_ident[EI_MAG0] != ELFMAG0
|| ehdr.e_ident[EI_MAG1] != ELFMAG1
|| ehdr.e_ident[EI_MAG2] != ELFMAG2
|| ehdr.e_ident[EI_MAG3] != ELFMAG3
|| ehdr.e_ident[EI_VERSION] != EV_CURRENT
|| ehdr.e_version != EV_CURRENT)
break;
if (ehdr.e_ident[EI_CLASS] != ELFCLASS64
|| ehdr.e_ident[EI_DATA] != ELFDATA2LSB
|| ehdr.e_machine != grub_cpu_to_le16_compile_time (EM_IA_64))
break;
ret = 1;
break;
}
case IS_SPARC64_LINUX:
{
Elf64_Ehdr ehdr;
if (grub_file_read (file, &ehdr, sizeof (ehdr)) != sizeof (ehdr))
break;
if (ehdr.e_ident[EI_MAG0] != ELFMAG0
|| ehdr.e_ident[EI_MAG1] != ELFMAG1
|| ehdr.e_ident[EI_MAG2] != ELFMAG2
|| ehdr.e_ident[EI_MAG3] != ELFMAG3
|| ehdr.e_ident[EI_VERSION] != EV_CURRENT
|| ehdr.e_version != EV_CURRENT)
break;
if (ehdr.e_ident[EI_CLASS] != ELFCLASS64
|| ehdr.e_ident[EI_DATA] != ELFDATA2MSB)
break;
if (ehdr.e_machine != grub_cpu_to_le16_compile_time (EM_SPARCV9)
|| ehdr.e_type != grub_cpu_to_be16_compile_time (ET_EXEC))
break;
ret = 1;
break;
}
case IS_POWERPC_LINUX:
{
Elf32_Ehdr ehdr;
if (grub_file_read (file, &ehdr, sizeof (ehdr)) != sizeof (ehdr))
break;
if (ehdr.e_ident[EI_MAG0] != ELFMAG0
|| ehdr.e_ident[EI_MAG1] != ELFMAG1
|| ehdr.e_ident[EI_MAG2] != ELFMAG2
|| ehdr.e_ident[EI_MAG3] != ELFMAG3
|| ehdr.e_ident[EI_VERSION] != EV_CURRENT
|| ehdr.e_version != EV_CURRENT)
break;
if (ehdr.e_ident[EI_DATA] != ELFDATA2MSB
|| (ehdr.e_machine != grub_cpu_to_le16_compile_time (EM_PPC)
&& ehdr.e_machine !=
grub_cpu_to_le16_compile_time (EM_PPC64)))
break;
if (ehdr.e_type != grub_cpu_to_be16_compile_time (ET_EXEC)
&& ehdr.e_type != grub_cpu_to_be16_compile_time (ET_DYN))
break;
ret = 1;
break;
}
case IS_MIPS_LINUX:
{
Elf32_Ehdr ehdr;
if (grub_file_read (file, &ehdr, sizeof (ehdr)) != sizeof (ehdr))
break;
if (ehdr.e_ident[EI_MAG0] != ELFMAG0
|| ehdr.e_ident[EI_MAG1] != ELFMAG1
|| ehdr.e_ident[EI_MAG2] != ELFMAG2
|| ehdr.e_ident[EI_MAG3] != ELFMAG3
|| ehdr.e_ident[EI_VERSION] != EV_CURRENT
|| ehdr.e_version != EV_CURRENT)
break;
if (ehdr.e_ident[EI_DATA] != ELFDATA2MSB
|| ehdr.e_machine != grub_cpu_to_be16_compile_time (EM_MIPS)
|| ehdr.e_type != grub_cpu_to_be16_compile_time (ET_EXEC))
break;
ret = 1;
break;
}
case IS_X86_KNETBSD:
case IS_X86_KNETBSD32:
case IS_X86_KNETBSD64:
{
int is32, is64;
elf = grub_elf_file (file, file->name);
if (elf->ehdr.ehdr32.e_type != grub_cpu_to_le16_compile_time (ET_EXEC)
|| elf->ehdr.ehdr32.e_ident[EI_DATA] != ELFDATA2LSB)
break;
is32 = grub_elf_is_elf32 (elf);
is64 = grub_elf_is_elf64 (elf);
if (!is32 && !is64)
break;
if (!is32 && type == IS_X86_KNETBSD32)
break;
if (!is64 && type == IS_X86_KNETBSD64)
break;
if (is64)
ret = grub_file_check_netbsd64 (elf);
if (is32)
ret = grub_file_check_netbsd32 (elf);
break;
}
case IS_X86_KFREEBSD:
case IS_X86_KFREEBSD32:
case IS_X86_KFREEBSD64:
{
Elf32_Ehdr ehdr;
int is32, is64;
if (grub_file_read (file, &ehdr, sizeof (ehdr)) != sizeof (ehdr))
break;
if (ehdr.e_ident[EI_MAG0] != ELFMAG0
|| ehdr.e_ident[EI_MAG1] != ELFMAG1
|| ehdr.e_ident[EI_MAG2] != ELFMAG2
|| ehdr.e_ident[EI_MAG3] != ELFMAG3
|| ehdr.e_ident[EI_VERSION] != EV_CURRENT
|| ehdr.e_version != EV_CURRENT)
break;
if (ehdr.e_type != grub_cpu_to_le16_compile_time (ET_EXEC)
|| ehdr.e_ident[EI_DATA] != ELFDATA2LSB)
break;
if (ehdr.e_ident[EI_OSABI] != ELFOSABI_FREEBSD)
break;
is32 = (ehdr.e_machine == grub_cpu_to_le16_compile_time (EM_386)
&& ehdr.e_ident[EI_CLASS] == ELFCLASS32);
is64 = (ehdr.e_machine == grub_cpu_to_le16_compile_time (EM_X86_64)
&& ehdr.e_ident[EI_CLASS] == ELFCLASS64);
if (!is32 && !is64)
break;
if (!is32 && (type == IS_X86_KFREEBSD32 || type == IS_X86_KNETBSD32))
break;
if (!is64 && (type == IS_X86_KFREEBSD64 || type == IS_X86_KNETBSD64))
break;
ret = 1;
break;
}
case IS_MIPSEL_LINUX:
{
Elf32_Ehdr ehdr;
if (grub_file_read (file, &ehdr, sizeof (ehdr)) != sizeof (ehdr))
break;
if (ehdr.e_ident[EI_MAG0] != ELFMAG0
|| ehdr.e_ident[EI_MAG1] != ELFMAG1
|| ehdr.e_ident[EI_MAG2] != ELFMAG2
|| ehdr.e_ident[EI_MAG3] != ELFMAG3
|| ehdr.e_ident[EI_VERSION] != EV_CURRENT
|| ehdr.e_version != EV_CURRENT)
break;
if (ehdr.e_machine != grub_cpu_to_le16_compile_time (EM_MIPS)
|| ehdr.e_type != grub_cpu_to_le16_compile_time (ET_EXEC))
break;
ret = 1;
break;
}
case IS_ARM_LINUX:
{
grub_uint32_t sig, sig_pi;
if (grub_file_read (file, &sig_pi, 4) != 4)
break;
/* Raspberry pi. */
if (sig_pi == grub_cpu_to_le32_compile_time (0xea000006))
{
ret = 1;
break;
}
if (grub_file_seek (file, 0x24) == (grub_size_t) -1)
break;
if (grub_file_read (file, &sig, 4) != 4)
break;
if (sig == grub_cpu_to_le32_compile_time (0x016f2818))
{
ret = 1;
break;
}
break;
}
case IS_ARM64_LINUX:
{
grub_uint32_t sig;
if (grub_file_seek (file, 0x38) == (grub_size_t) -1)
break;
if (grub_file_read (file, &sig, 4) != 4)
break;
if (sig == grub_cpu_to_le32_compile_time (0x644d5241))
{
ret = 1;
break;
}
break;
}
case IS_PAE_DOMU ... IS_DOM0:
{
struct grub_xen_file_info xen_inf;
elf = grub_xen_file (file);
if (!elf)
break;
err = grub_xen_get_info (elf, &xen_inf);
if (err)
break;
/* Unfortuntely no way to check if kernel supports dom0. */
if (type == IS_DOM0)
ret = 1;
if (type == IS_PAE_DOMU)
ret = (xen_inf.arch == GRUB_XEN_FILE_I386_PAE
|| xen_inf.arch == GRUB_XEN_FILE_I386_PAE_BIMODE);
if (type == IS_64_DOMU)
ret = (xen_inf.arch == GRUB_XEN_FILE_X86_64);
break;
}
case IS_MULTIBOOT:
case IS_MULTIBOOT2:
{
grub_uint32_t *buffer;
grub_ssize_t len;
grub_size_t search_size;
grub_uint32_t *header;
grub_uint32_t magic;
grub_size_t step;
if (type == IS_MULTIBOOT2)
{
search_size = 32768;
magic = grub_cpu_to_le32_compile_time (0xe85250d6);
step = 2;
}
else
{
search_size = 8192;
magic = grub_cpu_to_le32_compile_time (0x1BADB002);
step = 1;
}
buffer = grub_malloc (search_size);
if (!buffer)
break;
len = grub_file_read (file, buffer, search_size);
if (len < 32)
{
grub_free (buffer);
break;
}
/* Look for the multiboot header in the buffer. The header should
be at least 12 bytes and aligned on a 4-byte boundary. */
for (header = buffer;
((char *) header <=
(char *) buffer + len - (type == IS_MULTIBOOT2 ? 16 : 12));
header += step)
{
if (header[0] == magic
&& !(grub_le_to_cpu32 (header[0])
+ grub_le_to_cpu32 (header[1])
+ grub_le_to_cpu32 (header[2])
+ (type == IS_MULTIBOOT2
? grub_le_to_cpu32 (header[3]) : 0)))
{
ret = 1;
break;
}
}
grub_free (buffer);
break;
}
case IS_X86_LINUX32:
case IS_X86_LINUX:
{
struct linux_kernel_header lh;
if (grub_file_read (file, &lh, sizeof (lh)) != sizeof (lh))
break;
if (lh.boot_flag != grub_cpu_to_le16_compile_time (0xaa55))
break;
if (lh.setup_sects > GRUB_LINUX_MAX_SETUP_SECTS)
break;
/* FIXME: some really old kernels (< 1.3.73) will fail this. */
if (lh.header !=
grub_cpu_to_le32_compile_time (GRUB_LINUX_MAGIC_SIGNATURE)
|| grub_le_to_cpu16 (lh.version) < 0x0200)
break;
if (type == IS_X86_LINUX)
{
ret = 1;
break;
}
/* FIXME: 2.03 is not always good enough (Linux 2.4 can be 2.03 and
still not support 32-bit boot. */
if (lh.header !=
grub_cpu_to_le32_compile_time (GRUB_LINUX_MAGIC_SIGNATURE)
|| grub_le_to_cpu16 (lh.version) < 0x0203)
break;
if (!(lh.loadflags & GRUB_LINUX_FLAG_BIG_KERNEL))
break;
ret = 1;
break;
}
case IS_HIBERNATED:
{
grub_uint8_t hibr_file_magic[4];
if (grub_file_read (file, &hibr_file_magic, sizeof (hibr_file_magic))
!= sizeof (hibr_file_magic))
break;
if (grub_memcmp ("hibr", hibr_file_magic, sizeof (hibr_file_magic)) ==
0
|| grub_memcmp ("HIBR", hibr_file_magic,
sizeof (hibr_file_magic)) == 0)
ret = 1;
break;
}
case IS_XNU64:
case IS_XNU32:
{
macho = grub_macho_open (args[0], (type == IS_XNU64));
if (!macho)
break;
/* FIXME: more checks? */
ret = 1;
break;
}
case IS_XNU_HIBR:
{
struct grub_xnu_hibernate_header hibhead;
if (grub_file_read (file, &hibhead, sizeof (hibhead))
!= sizeof (hibhead))
break;
if (hibhead.magic !=
grub_cpu_to_le32_compile_time (GRUB_XNU_HIBERNATE_MAGIC))
break;
ret = 1;
break;
}
case IS_32_EFI:
case IS_64_EFI:
case IS_IA_EFI:
case IS_ARM64_EFI:
case IS_ARM_EFI:
{
char signature[4];
grub_uint32_t pe_offset;
struct grub_pe32_coff_header coff_head;
if (grub_file_read (file, signature, 2) != 2)
break;
if (signature[0] != 'M' || signature[1] != 'Z')
break;
if ((grub_ssize_t) grub_file_seek (file, 0x3c) == -1)
break;
if (grub_file_read (file, &pe_offset, 4) != 4)
break;
if ((grub_ssize_t) grub_file_seek (file, grub_le_to_cpu32 (pe_offset))
== -1)
break;
if (grub_file_read (file, signature, 4) != 4)
break;
if (signature[0] != 'P' || signature[1] != 'E'
|| signature[2] != '\0' || signature[3] != '\0')
break;
if (grub_file_read (file, &coff_head, sizeof (coff_head))
!= sizeof (coff_head))
break;
if (type == IS_32_EFI
&& coff_head.machine !=
grub_cpu_to_le16_compile_time (GRUB_PE32_MACHINE_I386))
break;
if (type == IS_64_EFI
&& coff_head.machine !=
grub_cpu_to_le16_compile_time (GRUB_PE32_MACHINE_X86_64))
break;
if (type == IS_IA_EFI
&& coff_head.machine !=
grub_cpu_to_le16_compile_time (GRUB_PE32_MACHINE_IA64))
break;
if (type == IS_ARM64_EFI
&& coff_head.machine !=
grub_cpu_to_le16_compile_time (GRUB_PE32_MACHINE_ARM64))
break;
if (type == IS_ARM_EFI
&& coff_head.machine !=
grub_cpu_to_le16_compile_time (GRUB_PE32_MACHINE_ARMTHUMB_MIXED))
break;
if (type == IS_IA_EFI || type == IS_64_EFI || type == IS_ARM64_EFI)
{
struct grub_pe64_optional_header o64;
if (grub_file_read (file, &o64, sizeof (o64)) != sizeof (o64))
break;
if (o64.magic !=
grub_cpu_to_le16_compile_time (GRUB_PE32_PE64_MAGIC))
break;
if (o64.subsystem !=
grub_cpu_to_le16_compile_time
(GRUB_PE32_SUBSYSTEM_EFI_APPLICATION))
break;
ret = 1;
break;
}
if (type == IS_32_EFI || type == IS_ARM_EFI)
{
struct grub_pe32_optional_header o32;
if (grub_file_read (file, &o32, sizeof (o32)) != sizeof (o32))
break;
if (o32.magic !=
grub_cpu_to_le16_compile_time (GRUB_PE32_PE32_MAGIC))
break;
if (o32.subsystem !=
grub_cpu_to_le16_compile_time
(GRUB_PE32_SUBSYSTEM_EFI_APPLICATION))
break;
ret = 1;
break;
}
break;
}
}
if (elf)
grub_elf_close (elf);
else if (macho)
grub_macho_close (macho);
else if (file)
grub_file_close (file);
if (!ret && (grub_errno == GRUB_ERR_BAD_OS || grub_errno == GRUB_ERR_NONE))
/* TRANSLATORS: it's a standalone boolean value,
opposite of "true". */
grub_error (GRUB_ERR_TEST_FAILURE, N_("false"));
return grub_errno;
}
static grub_extcmd_t cmd;
GRUB_MOD_INIT(file)
{
cmd = grub_register_extcmd ("file", grub_cmd_file, 0,
N_("OPTIONS FILE"),
N_("Check if FILE is of specified type."),
options);
}
GRUB_MOD_FINI(file)
{
grub_unregister_extcmd (cmd);
}
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