https://sourceware.org/bugzilla/show_bug.cgi?id=17466
Bug ID: 17466
Summary: objcopy corrupts Windows executables when adding a
section
Product: binutils
Version: 2.24
Status: NEW
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: gintautas.miliauskas at gmail dot com
I've been trying to add some additional information to a Windows .exe file
(compiled by mingw gcc) using objcopy, but whenever I add a new section using
objcopy, the binary fails to execute. Here's a summary script:
$ cd /tmp
$ echo 'int main() { return 0; }' > c.c
$ gcc -o c.exe c.c
$ ./c.exe && echo ok
ok
$ echo x > x
$ objcopy c.exe --add-section .debug_foo=x
$ ./c.exe
bash: ./c.exe: cannot execute binary file: Exec format error
$ objdump -j c.exe
0 .debug_foo 00000002 0000000100000000 0000000100000000 00000458 2**0
CONTENTS, READONLY, DEBUGGING
1 .text 00001d00 0000000000401000 0000000000401000 00000800 2**4
CONTENTS, ALLOC, LOAD, READONLY, CODE
2 .data 000000a0 0000000000403000 0000000000403000 00002600 2**4
CONTENTS, ALLOC, LOAD, DATA
3 .rdata 00000970 0000000000404000 0000000000404000 00002800 2**4
CONTENTS, ALLOC, LOAD, READONLY, DATA
4 .pdata 00000234 0000000000405000 0000000000405000 00003200 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
5 .xdata 000001f8 0000000000406000 0000000000406000 00003600 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
6 .bss 00000a60 0000000000407000 0000000000407000 00000000 2**6
ALLOC
7 .idata 000007ac 0000000000408000 0000000000408000 00003800 2**2
CONTENTS, ALLOC, LOAD, DATA
8 .CRT 00000068 0000000000409000 0000000000409000 00004000 2**3
CONTENTS, ALLOC, LOAD, DATA
9 .tls 00000068 000000000040a000 000000000040a000 00004200 2**5
CONTENTS, ALLOC, LOAD, DATA
10 .debug_aranges 000003d0 000000000040b000 000000000040b000 00004400 2**0
CONTENTS, READONLY, DEBUGGING
11 .debug_info 0000b2d4 000000000040c000 000000000040c000 00004800 2**0
CONTENTS, READONLY, DEBUGGING
12 .debug_abbrev 000019cc 0000000000418000 0000000000418000 0000fc00 2**0
CONTENTS, READONLY, DEBUGGING
13 .debug_line 000017c0 000000000041a000 000000000041a000 00011600 2**0
CONTENTS, READONLY, DEBUGGING
14 .debug_frame 00000ac0 000000000041c000 000000000041c000 00012e00 2**3
CONTENTS, READONLY, DEBUGGING
15 .debug_str 00000300 000000000041d000 000000000041d000 00013a00 2**0
CONTENTS, READONLY, DEBUGGING
16 .debug_loc 00002e19 000000000041e000 000000000041e000 00013e00 2**0
CONTENTS, READONLY, DEBUGGING
17 .debug_ranges 00000520 0000000000421000 0000000000421000 00016e00 2**0
CONTENTS, READONLY, DEBUGGING
Not sure why the section ends up first, but either way, if I run the binary
through objcopy again, the new section is moved to the end:
$ objcopy c.exe
$ objdump -h c.exe
c.exe: file format pei-x86-64
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00001d00 0000000000401000 0000000000401000 00000600 2**4
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .data 000000a0 0000000000403000 0000000000403000 00002400 2**4
CONTENTS, ALLOC, LOAD, DATA
2 .rdata 00000970 0000000000404000 0000000000404000 00002600 2**4
CONTENTS, ALLOC, LOAD, READONLY, DATA
3 .pdata 00000234 0000000000405000 0000000000405000 00003000 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
4 .xdata 000001f8 0000000000406000 0000000000406000 00003400 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
5 .bss 00000a60 0000000000407000 0000000000407000 00000000 2**6
ALLOC
6 .idata 000007ac 0000000000408000 0000000000408000 00003600 2**2
CONTENTS, ALLOC, LOAD, DATA
7 .CRT 00000068 0000000000409000 0000000000409000 00003e00 2**3
CONTENTS, ALLOC, LOAD, DATA
8 .tls 00000068 000000000040a000 000000000040a000 00004000 2**5
CONTENTS, ALLOC, LOAD, DATA
9 .debug_aranges 000003d0 000000000040b000 000000000040b000 00004200 2**0
CONTENTS, READONLY, DEBUGGING
10 .debug_info 0000b2d4 000000000040c000 000000000040c000 00004600 2**0
CONTENTS, READONLY, DEBUGGING
11 .debug_abbrev 000019cc 0000000000418000 0000000000418000 0000fa00 2**0
CONTENTS, READONLY, DEBUGGING
12 .debug_line 000017c0 000000000041a000 000000000041a000 00011400 2**0
CONTENTS, READONLY, DEBUGGING
13 .debug_frame 00000ac0 000000000041c000 000000000041c000 00012c00 2**3
CONTENTS, READONLY, DEBUGGING
14 .debug_str 00000300 000000000041d000 000000000041d000 00013800 2**0
CONTENTS, READONLY, DEBUGGING
15 .debug_loc 00002e19 000000000041e000 000000000041e000 00013c00 2**0
CONTENTS, READONLY, DEBUGGING
16 .debug_ranges 00000520 0000000000421000 0000000000421000 00016c00 2**0
CONTENTS, READONLY, DEBUGGING
17 .debug_foo 00000002 0000000100000000 0000000100000000 00017200 2**0
CONTENTS, READONLY, DEBUGGING
The corruption is not irreversible: if I remove the section using objcopy, the
binary starts working again:
$ objcopy --remove-section .debug_foo c.exe
$ ./c.exe && echo ok
ok
What's going on here? Is this use case of objcopy intrinsically not supported?
Should I be using something else?
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