https://sourceware.org/bugzilla/show_bug.cgi?id=22829
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hjl.tools at gmail dot com
--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
binutils expects that PT_GNU_RELRO segment is placed right before
a read-only section so that it can be merged with previous read-only
PT_LOAD segment at run-time. lld generates:
There are 30 section headers, starting at offset 0x36b0:
Section Headers:
[Nr] Name Type Address Off Size ES Flg
Lk Inf Al
[ 0] NULL 0000000000000000 000000 000000 00
0 0 0
[ 1] .interp PROGBITS 0000000000200270 000270 00001c 00 A
0 0 1
[ 2] .note.ABI-tag NOTE 000000000020028c 00028c 000020 00 A
0 0 4
[ 3] .rodata PROGBITS 00000000002002ac 0002ac 000004 00 AM
0 0 4
[ 4] .dynsym DYNSYM 00000000002002b0 0002b0 000048 18 A
8 1 8
[ 5] .gnu.version VERSYM 00000000002002f8 0002f8 000006 02 A
4 0 2
[ 6] .gnu.version_r VERNEED 0000000000200300 000300 000020 00 A
8 1 4
[ 7] .hash HASH 0000000000200320 000320 000020 04 A
4 0 4
[ 8] .dynstr STRTAB 0000000000200340 000340 000030 00 A
0 0 1
[ 9] .rela.dyn RELA 0000000000200370 000370 000018 18 A
4 0 8
[10] .rela.plt RELA 0000000000200388 000388 000018 18 A
4 0 8
[11] .eh_frame_hdr PROGBITS 00000000002003a0 0003a0 00002c 00 A
0 0 1
[12] .eh_frame PROGBITS 00000000002003d0 0003d0 0000c8 00 A
0 0 8
[13] .text PROGBITS 0000000000201000 001000 000182 00 AX
0 0 16
[14] .init PROGBITS 0000000000201184 001184 000017 00 AX
0 0 4
[15] .fini PROGBITS 000000000020119c 00119c 000009 00 AX
0 0 4
[16] .plt PROGBITS 00000000002011b0 0011b0 000020 00 AX
0 0 16
[17] .data PROGBITS 0000000000202000 002000 000010 00 WA
0 0 8
[18] .tm_clone_table PROGBITS 0000000000202010 002010 000000 00 WA
0 0 8
[19] .got.plt PROGBITS 0000000000202010 002010 000020 00 WA
0 0 8
[20] .fini_array FINI_ARRAY 0000000000203000 003000 000008 08 WA
0 0 8
[21] .init_array INIT_ARRAY 0000000000203008 003008 000008 08 WA
0 0 8
[22] .dynamic DYNAMIC 0000000000203010 003010 000180 10 WA
8 0 8
[23] .got PROGBITS 0000000000203190 003190 000010 00 WA
0 0 8
[24] .bss NOBITS 0000000000204000 0031a0 000001 00 WA
0 0 1
[25] .comment PROGBITS 0000000000000000 0031a0 00007e 00 MS
0 0 1
[26] .gnu_debuglink PROGBITS 0000000000000000 003220 000068 00
0 0 4
[27] .symtab SYMTAB 0000000000000000 003288 0001f8 18
29 7 8
[28] .shstrtab STRTAB 0000000000000000 003480 000110 00
0 0 1
[29] .strtab STRTAB 0000000000000000 003590 00011a 00
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)
Elf file type is EXEC (Executable file)
Entry point 0x201000
There are 10 program headers, starting at offset 64
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz
Flg Align
PHDR 0x000040 0x0000000000200040 0x0000000000200040 0x000230
0x000230 R 0x8
INTERP 0x000270 0x0000000000200270 0x0000000000200270 0x00001c
0x00001c R 0x1
[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]
LOAD 0x000000 0x0000000000200000 0x0000000000200000 0x000498
0x000498 R 0x1000
LOAD 0x001000 0x0000000000201000 0x0000000000201000 0x0001d0
0x0001d0 R E 0x1000
LOAD 0x002000 0x0000000000202000 0x0000000000202000 0x0011a0
0x002001 RW 0x1000
DYNAMIC 0x003010 0x0000000000203010 0x0000000000203010 0x000180
0x000180 RW 0x8
GNU_RELRO 0x003000 0x0000000000203000 0x0000000000203000 0x0001a0
0x001000 R 0x1
GNU_EH_FRAME 0x0003a0 0x00000000002003a0 0x00000000002003a0 0x00002c
0x00002c R 0x1
GNU_STACK 0x000000 0x0000000000000000 0x0000000000000000 0x000000
0x000000 RW 0
NOTE 0x00028c 0x000000000020028c 0x000000000020028c 0x000020
0x000020 R 0x4
Section to Segment mapping:
Segment Sections...
00
01 .interp
02 .interp .note.ABI-tag .rodata .dynsym .gnu.version .gnu.version_r
.hash .dynstr .rela.dyn .rela.plt .eh_frame_hdr .eh_frame
03 .text .init .fini .plt
04 .data .tm_clone_table .got.plt .fini_array .init_array .dynamic .got
.bss
05 .dynamic
06 .fini_array .init_array .dynamic .got
07 .eh_frame_hdr
08
09 .note.ABI-tag
.tm_clone_table section before PT_GNU_RELRO isn't read-only.
$ gcc x.c -Wl,-z,separate-code -Wl,-z,max-page-size=0x1000
generates:
There are 29 section headers, starting at offset 0x38d8:
Section Headers:
[Nr] Name Type Address Off Size ES Flg
Lk Inf Al
[ 0] NULL 0000000000000000 000000 000000 00
0 0 0
[ 1] .interp PROGBITS 00000000004002a8 0002a8 00001c 00 A
0 0 1
[ 2] .note.ABI-tag NOTE 00000000004002c4 0002c4 000020 00 A
0 0 4
[ 3] .note.gnu.build-id NOTE 00000000004002e4 0002e4 000024 00 A
0 0 4
[ 4] .gnu.hash GNU_HASH 0000000000400308 000308 00001c 00 A
5 0 8
[ 5] .dynsym DYNSYM 0000000000400328 000328 000060 18 A
6 1 8
[ 6] .dynstr STRTAB 0000000000400388 000388 00003f 00 A
0 0 1
[ 7] .gnu.version VERSYM 00000000004003c8 0003c8 000008 02 A
5 0 2
[ 8] .gnu.version_r VERNEED 00000000004003d0 0003d0 000020 00 A
6 1 8
[ 9] .rela.dyn RELA 00000000004003f0 0003f0 000030 18 A
5 0 8
[10] .rela.plt RELA 0000000000400420 000420 000018 18 AI
5 22 8
[11] .init PROGBITS 0000000000401000 001000 000017 00 AX
0 0 4
[12] .plt PROGBITS 0000000000401020 001020 000020 10 AX
0 0 16
[13] .text PROGBITS 0000000000401040 001040 000162 00 AX
0 0 16
[14] .fini PROGBITS 00000000004011a4 0011a4 000009 00 AX
0 0 4
[15] .rodata PROGBITS 0000000000402000 002000 000010 00 A
0 0 8
[16] .eh_frame_hdr PROGBITS 0000000000402010 002010 000034 00 A
0 0 4
[17] .eh_frame PROGBITS 0000000000402048 002048 0000f0 00 A
0 0 8
[18] .init_array INIT_ARRAY 0000000000403e10 002e10 000008 08 WA
0 0 8
[19] .fini_array FINI_ARRAY 0000000000403e18 002e18 000008 08 WA
0 0 8
[20] .dynamic DYNAMIC 0000000000403e20 002e20 0001d0 10 WA
6 0 8
[21] .got PROGBITS 0000000000403ff0 002ff0 000010 08 WA
0 0 8
[22] .got.plt PROGBITS 0000000000404000 003000 000020 08 WA
0 0 8
[23] .data PROGBITS 0000000000404020 003020 000004 00 WA
0 0 1
[24] .bss NOBITS 0000000000404024 003024 000004 00 WA
0 0 1
[25] .comment PROGBITS 0000000000000000 003024 000058 01 MS
0 0 1
[26] .symtab SYMTAB 0000000000000000 003080 0005a0 18
27 43 8
[27] .strtab STRTAB 0000000000000000 003620 0001af 00
0 0 1
[28] .shstrtab STRTAB 0000000000000000 0037cf 000103 00
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)
Elf file type is EXEC (Executable file)
Entry point 0x401040
There are 11 program headers, starting at offset 64
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz
Flg Align
PHDR 0x000040 0x0000000000400040 0x0000000000400040 0x000268
0x000268 R 0x8
INTERP 0x0002a8 0x00000000004002a8 0x00000000004002a8 0x00001c
0x00001c R 0x1
[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]
LOAD 0x000000 0x0000000000400000 0x0000000000400000 0x000438
0x000438 R 0x1000
LOAD 0x001000 0x0000000000401000 0x0000000000401000 0x0001ad
0x0001ad R E 0x1000
LOAD 0x002000 0x0000000000402000 0x0000000000402000 0x000138
0x000138 R 0x1000
LOAD 0x002e10 0x0000000000403e10 0x0000000000403e10 0x000214
0x000218 RW 0x1000
DYNAMIC 0x002e20 0x0000000000403e20 0x0000000000403e20 0x0001d0
0x0001d0 RW 0x8
NOTE 0x0002c4 0x00000000004002c4 0x00000000004002c4 0x000044
0x000044 R 0x4
GNU_EH_FRAME 0x002010 0x0000000000402010 0x0000000000402010 0x000034
0x000034 R 0x4
GNU_STACK 0x000000 0x0000000000000000 0x0000000000000000 0x000000
0x000000 RW 0x10
GNU_RELRO 0x002e10 0x0000000000403e10 0x0000000000403e10 0x0001f0
0x0001f0 R 0x1
Section to Segment mapping:
Segment Sections...
00
01 .interp
02 .interp .note.ABI-tag .note.gnu.build-id .gnu.hash .dynsym .dynstr
.gnu.version .gnu.version_r .rela.dyn .rela.plt
03 .init .plt .text .fini
04 .rodata .eh_frame_hdr .eh_frame
05 .init_array .fini_array .dynamic .got .got.plt .data .bss
06 .dynamic
07 .note.ABI-tag .note.gnu.build-id
08 .eh_frame_hdr
09
10 .init_array .fini_array .dynamic .got
.eh_frame section before PT_GNU_RELRO segment is read-only.
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