138 lines
3.2 KiB
ArmAsm
138 lines
3.2 KiB
ArmAsm
/*
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* Copyright (c) 2018 Kevin Wolf <kwolf@redhat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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.section multiboot
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#define MB_MAGIC 0x1badb002
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#define MB_FLAGS 0x10000
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#define MB_CHECKSUM -(MB_MAGIC + MB_FLAGS)
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.align 4
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.int MB_MAGIC
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.int MB_FLAGS
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.int MB_CHECKSUM
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#define LAST_BYTE_VALUE 0xa5
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/*
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* Order of fields in the a.out kludge header fields:
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*
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* header_addr
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* load_addr
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* load_end_addr
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* bss_end_addr
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* entry_addr
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*/
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#if SCENARIO == 1
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/* Well-behaved kernel file with explicit bss_end */
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.int 0x100000
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.int 0x100000
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.int data_end
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.int data_end
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.int _start
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#elif SCENARIO == 2
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/* Well-behaved kernel file with default bss_end */
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.int 0x100000
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.int 0x100000
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.int data_end
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.int 0
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.int _start
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#elif SCENARIO == 3
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/* Well-behaved kernel file with default load_end */
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.int 0x100000
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.int 0x100000
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.int 0
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.int 0
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.int _start
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#elif SCENARIO == 4
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/* Well-behaved kernel file with load_end < data_end and bss > data_end */
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#undef LAST_BYTE_VALUE
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#define LAST_BYTE_VALUE 0
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.int 0x100000
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.int 0x100000
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.int code_end
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.int 0x140000
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.int _start
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#elif SCENARIO == 5
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/* header < load */
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.int 0x10000
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.int 0x100000
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.int data_end
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.int data_end
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.int _start
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#elif SCENARIO == 6
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/* load_end < load */
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.int 0x100000
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.int 0x100000
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.int 0x10000
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.int data_end
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.int _start
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#elif SCENARIO == 7
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/* header much larger than in reality with default load_end */
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.int 0x80000000
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.int 0x100000
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.int 0
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.int data_end
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.int _start
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#elif SCENARIO == 8
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/* bss_end < load_end - load (regression test for CVE-2018-7550) */
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.int 0x100000
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.int 0x100000
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.int data_end
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.int code_end
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.int _start
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#elif SCENARIO == 9
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/* Default load_end_addr, load_addr + kernel_file_size > UINT32_MAX */
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.int 0xfffff000
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.int 0xfffff000
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.int 0
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.int 0xfffff001
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.int _start
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#else
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#error Invalid SCENARIO
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#endif
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.section .text
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.global _start
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_start:
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xor %eax, %eax
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cmpb $LAST_BYTE_VALUE, last_byte
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je passed
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or $0x1, %eax
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passed:
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/* Test device exit */
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outl %eax, $0xf4
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cli
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hlt
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jmp .
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code_end:
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#if SCENARIO != 8
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.space 8192
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#endif
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last_byte:
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.byte 0xa5
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data_end:
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