ELF 可执行段错误
ELF Executable Segfaults
我一直在尝试使用 libelf 创建 ELF 可执行文件，但还没有成功 运行ning。每当我尝试 运行 它时，我都会遇到段错误。 strace 输出：
execve("./test.elf", ["./test.elf"], 0x7ffc28d60660 /* 63 vars */) = -1 EINVAL (Invalid argument)
+++ killed by SIGSEGV +++
readelf 给出：
ELF Header:
Magic: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00
Class: ELF64
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: Advanced Micro Devices X86-64
Version: 0x1
Entry point address: 0x1000
Start of program headers: 64 (bytes into file)
Start of section headers: 152 (bytes into file)
Flags: 0x0
Size of this header: 64 (bytes)
Size of program headers: 56 (bytes)
Number of program headers: 1
Size of section headers: 64 (bytes)
Number of section headers: 3
Section header string table index: 2
Section Headers:
[Nr] Name Type Address Offset
Size EntSize Flags Link Info Align
[ 0] NULL 0000000000000000 00000000
0000000000000000 0000000000000000 0 0 0
[ 1] .text PROGBITS 0000000000001000 00000078
0000000000000008 0000000000000000 AX 0 0 1
[ 2] .shstrtab STRTAB 0000000000000000 00000080
0000000000000011 0000000000000000 A 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
L (link order), O (extra OS processing required), G (group), T (TLS),
C (compressed), x (unknown), o (OS specific), E (exclude),
l (large), p (processor specific)
There are no section groups in this file.
Program Headers:
Type Offset VirtAddr PhysAddr
FileSiz MemSiz Flags Align
LOAD 0x0000000000000078 0x0000000000001000 0x0000000000001000
0x0000000000000008 0x0000000000000008 R E 0x1
Section to Segment mapping:
Segment Sections...
00 .text
There is no dynamic section in this file.
There are no relocations in this file.
The decoding of unwind sections for machine type Advanced Micro Devices X86-64 is not currently supported.
No version information found in this file.
这是文件的十六进制转储：
00000000 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 |.ELF............|
00000010 02 00 3e 00 01 00 00 00 00 10 00 00 00 00 00 00 |..>.............|
00000020 40 00 00 00 00 00 00 00 98 00 00 00 00 00 00 00 |@...............|
00000030 00 00 00 00 40 00 38 00 01 00 40 00 03 00 02 00 |....@.8...@.....|
00000040 01 00 00 00 05 00 00 00 78 00 00 00 00 00 00 00 |........x.......|
00000050 00 10 00 00 00 00 00 00 00 10 00 00 00 00 00 00 |................|
00000060 08 00 00 00 00 00 00 00 08 00 00 00 00 00 00 00 |................|
00000070 01 00 00 00 00 00 00 00 31 c0 ff c0 b3 2a cd 80 |........1....*..|
00000080 00 2e 74 65 78 74 00 2e 73 68 73 74 72 74 61 62 |..text..shstrtab|
00000090 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
000000d0 00 00 00 00 00 00 00 00 01 00 00 00 01 00 00 00 |................|
000000e0 06 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 |................|
000000f0 78 00 00 00 00 00 00 00 08 00 00 00 00 00 00 00 |x...............|
00000100 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 |................|
00000110 00 00 00 00 00 00 00 00 07 00 00 00 03 00 00 00 |................|
00000120 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000130 80 00 00 00 00 00 00 00 11 00 00 00 00 00 00 00 |................|
00000140 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 |................|
00000150 00 00 00 00 00 00 00 00 |........|
00000158
根据我阅读的内容并将其与工作的可执行文件进行比较，这应该可以工作。但它没有，我不知道为什么。感谢任何帮助，谢谢。
我想通了！当我查看工作可执行文件以供参考时，我查看的是 PIE，但我试图创建一个非 PIE。我没有意识到EHDR type needs to be ET_DYN for a PIE。另外，有几个地址是错误的。
新的readelf:
ELF Header:
Magic: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00
Class: ELF64
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: DYN (Shared object file)
Machine: Advanced Micro Devices X86-64
Version: 0x1
Entry point address: 0x1078
Start of program headers: 64 (bytes into file)
Start of section headers: 152 (bytes into file)
Flags: 0x0
Size of this header: 64 (bytes)
Size of program headers: 56 (bytes)
Number of program headers: 1
Size of section headers: 64 (bytes)
Number of section headers: 3
Section header string table index: 2
Section Headers:
[Nr] Name Type Address Offset
Size EntSize Flags Link Info Align
[ 0] NULL 0000000000000000 00000000
0000000000000000 0000000000000000 0 0 0
[ 1] .text PROGBITS 0000000000001078 00000078
0000000000000008 0000000000000000 AX 0 0 1
[ 2] .shstrtab STRTAB 0000000000000000 00000080
0000000000000011 0000000000000000 A 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
L (link order), O (extra OS processing required), G (group), T (TLS),
C (compressed), x (unknown), o (OS specific), E (exclude),
l (large), p (processor specific)
There are no section groups in this file.
Program Headers:
Type Offset VirtAddr PhysAddr
FileSiz MemSiz Flags Align
LOAD 0x0000000000000078 0x0000000000001078 0x0000000000001078
0x0000000000000008 0x0000000000000008 R E 0x1
Section to Segment mapping:
Segment Sections...
00 .text
There is no dynamic section in this file.
There are no relocations in this file.
The decoding of unwind sections for machine type Advanced Micro Devices X86-64 is not currently supported.
No version information found in this file.
以及新的十六进制转储：
00000000 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 |.ELF............|
00000010 03 00 3e 00 01 00 00 00 78 10 00 00 00 00 00 00 |..>.....x.......|
00000020 40 00 00 00 00 00 00 00 98 00 00 00 00 00 00 00 |@...............|
00000030 00 00 00 00 40 00 38 00 01 00 40 00 03 00 02 00 |....@.8...@.....|
00000040 01 00 00 00 05 00 00 00 78 00 00 00 00 00 00 00 |........x.......|
00000050 78 10 00 00 00 00 00 00 78 10 00 00 00 00 00 00 |x.......x.......|
00000060 08 00 00 00 00 00 00 00 08 00 00 00 00 00 00 00 |................|
00000070 01 00 00 00 00 00 00 00 31 c0 ff c0 b3 2a cd 80 |........1....*..|
00000080 00 2e 74 65 78 74 00 2e 73 68 73 74 72 74 61 62 |..text..shstrtab|
00000090 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
000000d0 00 00 00 00 00 00 00 00 01 00 00 00 01 00 00 00 |................|
000000e0 06 00 00 00 00 00 00 00 78 10 00 00 00 00 00 00 |........x.......|
000000f0 78 00 00 00 00 00 00 00 08 00 00 00 00 00 00 00 |x...............|
00000100 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 |................|
00000110 00 00 00 00 00 00 00 00 07 00 00 00 03 00 00 00 |................|
00000120 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000130 80 00 00 00 00 00 00 00 11 00 00 00 00 00 00 00 |................|
00000140 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 |................|
00000150 00 00 00 00 00 00 00 00 |........|
00000158
我一直在尝试使用 libelf 创建 ELF 可执行文件，但还没有成功 运行ning。每当我尝试 运行 它时，我都会遇到段错误。 strace 输出：
execve("./test.elf", ["./test.elf"], 0x7ffc28d60660 /* 63 vars */) = -1 EINVAL (Invalid argument)
+++ killed by SIGSEGV +++
readelf 给出：
ELF Header:
Magic: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00
Class: ELF64
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: Advanced Micro Devices X86-64
Version: 0x1
Entry point address: 0x1000
Start of program headers: 64 (bytes into file)
Start of section headers: 152 (bytes into file)
Flags: 0x0
Size of this header: 64 (bytes)
Size of program headers: 56 (bytes)
Number of program headers: 1
Size of section headers: 64 (bytes)
Number of section headers: 3
Section header string table index: 2
Section Headers:
[Nr] Name Type Address Offset
Size EntSize Flags Link Info Align
[ 0] NULL 0000000000000000 00000000
0000000000000000 0000000000000000 0 0 0
[ 1] .text PROGBITS 0000000000001000 00000078
0000000000000008 0000000000000000 AX 0 0 1
[ 2] .shstrtab STRTAB 0000000000000000 00000080
0000000000000011 0000000000000000 A 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
L (link order), O (extra OS processing required), G (group), T (TLS),
C (compressed), x (unknown), o (OS specific), E (exclude),
l (large), p (processor specific)
There are no section groups in this file.
Program Headers:
Type Offset VirtAddr PhysAddr
FileSiz MemSiz Flags Align
LOAD 0x0000000000000078 0x0000000000001000 0x0000000000001000
0x0000000000000008 0x0000000000000008 R E 0x1
Section to Segment mapping:
Segment Sections...
00 .text
There is no dynamic section in this file.
There are no relocations in this file.
The decoding of unwind sections for machine type Advanced Micro Devices X86-64 is not currently supported.
No version information found in this file.
这是文件的十六进制转储：
00000000 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 |.ELF............|
00000010 02 00 3e 00 01 00 00 00 00 10 00 00 00 00 00 00 |..>.............|
00000020 40 00 00 00 00 00 00 00 98 00 00 00 00 00 00 00 |@...............|
00000030 00 00 00 00 40 00 38 00 01 00 40 00 03 00 02 00 |....@.8...@.....|
00000040 01 00 00 00 05 00 00 00 78 00 00 00 00 00 00 00 |........x.......|
00000050 00 10 00 00 00 00 00 00 00 10 00 00 00 00 00 00 |................|
00000060 08 00 00 00 00 00 00 00 08 00 00 00 00 00 00 00 |................|
00000070 01 00 00 00 00 00 00 00 31 c0 ff c0 b3 2a cd 80 |........1....*..|
00000080 00 2e 74 65 78 74 00 2e 73 68 73 74 72 74 61 62 |..text..shstrtab|
00000090 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
000000d0 00 00 00 00 00 00 00 00 01 00 00 00 01 00 00 00 |................|
000000e0 06 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 |................|
000000f0 78 00 00 00 00 00 00 00 08 00 00 00 00 00 00 00 |x...............|
00000100 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 |................|
00000110 00 00 00 00 00 00 00 00 07 00 00 00 03 00 00 00 |................|
00000120 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000130 80 00 00 00 00 00 00 00 11 00 00 00 00 00 00 00 |................|
00000140 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 |................|
00000150 00 00 00 00 00 00 00 00 |........|
00000158
根据我阅读的内容并将其与工作的可执行文件进行比较，这应该可以工作。但它没有，我不知道为什么。感谢任何帮助，谢谢。
我想通了！当我查看工作可执行文件以供参考时，我查看的是 PIE，但我试图创建一个非 PIE。我没有意识到EHDR type needs to be ET_DYN for a PIE。另外，有几个地址是错误的。
新的readelf:
ELF Header:
Magic: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00
Class: ELF64
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: DYN (Shared object file)
Machine: Advanced Micro Devices X86-64
Version: 0x1
Entry point address: 0x1078
Start of program headers: 64 (bytes into file)
Start of section headers: 152 (bytes into file)
Flags: 0x0
Size of this header: 64 (bytes)
Size of program headers: 56 (bytes)
Number of program headers: 1
Size of section headers: 64 (bytes)
Number of section headers: 3
Section header string table index: 2
Section Headers:
[Nr] Name Type Address Offset
Size EntSize Flags Link Info Align
[ 0] NULL 0000000000000000 00000000
0000000000000000 0000000000000000 0 0 0
[ 1] .text PROGBITS 0000000000001078 00000078
0000000000000008 0000000000000000 AX 0 0 1
[ 2] .shstrtab STRTAB 0000000000000000 00000080
0000000000000011 0000000000000000 A 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
L (link order), O (extra OS processing required), G (group), T (TLS),
C (compressed), x (unknown), o (OS specific), E (exclude),
l (large), p (processor specific)
There are no section groups in this file.
Program Headers:
Type Offset VirtAddr PhysAddr
FileSiz MemSiz Flags Align
LOAD 0x0000000000000078 0x0000000000001078 0x0000000000001078
0x0000000000000008 0x0000000000000008 R E 0x1
Section to Segment mapping:
Segment Sections...
00 .text
There is no dynamic section in this file.
There are no relocations in this file.
The decoding of unwind sections for machine type Advanced Micro Devices X86-64 is not currently supported.
No version information found in this file.
以及新的十六进制转储：
00000000 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 |.ELF............|
00000010 03 00 3e 00 01 00 00 00 78 10 00 00 00 00 00 00 |..>.....x.......|
00000020 40 00 00 00 00 00 00 00 98 00 00 00 00 00 00 00 |@...............|
00000030 00 00 00 00 40 00 38 00 01 00 40 00 03 00 02 00 |....@.8...@.....|
00000040 01 00 00 00 05 00 00 00 78 00 00 00 00 00 00 00 |........x.......|
00000050 78 10 00 00 00 00 00 00 78 10 00 00 00 00 00 00 |x.......x.......|
00000060 08 00 00 00 00 00 00 00 08 00 00 00 00 00 00 00 |................|
00000070 01 00 00 00 00 00 00 00 31 c0 ff c0 b3 2a cd 80 |........1....*..|
00000080 00 2e 74 65 78 74 00 2e 73 68 73 74 72 74 61 62 |..text..shstrtab|
00000090 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
000000d0 00 00 00 00 00 00 00 00 01 00 00 00 01 00 00 00 |................|
000000e0 06 00 00 00 00 00 00 00 78 10 00 00 00 00 00 00 |........x.......|
000000f0 78 00 00 00 00 00 00 00 08 00 00 00 00 00 00 00 |x...............|
00000100 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 |................|
00000110 00 00 00 00 00 00 00 00 07 00 00 00 03 00 00 00 |................|
00000120 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000130 80 00 00 00 00 00 00 00 11 00 00 00 00 00 00 00 |................|
00000140 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 |................|
00000150 00 00 00 00 00 00 00 00 |........|
00000158