https://sourceware.org/bugzilla/show_bug.cgi?id=28743
--- Comment #12 from H.J. Lu <hjl.tools at gmail dot com> ---
A simple testcase:
[hjl@gnu-tgl-3 pr28743-2]$ cat relro1.s
.globl main
.globl start
.globl _start
.globl __start
.text
main:
start:
_start:
__start:
.long 0
.data
.long 0
.section .data.rel.ro,"aw",%progbits
.long 0
[hjl@gnu-tgl-3 pr28743-2]$ make
as -mx86-used-note=no -o relro1.o relro1.s
./ld -z noseparate-code -z relro -o relro1 relro1.o
readelf -lSW relro1
There are 7 section headers, starting at offset 0x1128:
Section Headers:
[Nr] Name Type Address Off Size ES Flg
Lk Inf Al
[ 0] NULL 0000000000000000 000000 000000 00
0 0 0
[ 1] .text PROGBITS 00000000004000e8 0000e8 000004 00 AX
0 0 1
[ 2] .data.rel.ro PROGBITS 0000000000401ffc 000ffc 000004 00 WA
0 0 1
[ 3] .data PROGBITS 0000000000402000 001000 000004 00 WA
0 0 1
[ 4] .symtab SYMTAB 0000000000000000 001008 0000c0 18
5 1 8
[ 5] .strtab STRTAB 0000000000000000 0010c8 000026 00
0 0 1
[ 6] .shstrtab STRTAB 0000000000000000 0010ee 000034 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),
D (mbind), l (large), p (processor specific)
Elf file type is EXEC (Executable file)
Entry point 0x4000e8
There are 3 program headers, starting at offset 64
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz
Flg Align
LOAD 0x000000 0x0000000000400000 0x0000000000400000 0x0000ec
0x0000ec R E 0x1000
LOAD 0x000ffc 0x0000000000401ffc 0x0000000000401ffc 0x000008
0x000008 RW 0x1000
GNU_RELRO 0x000ffc 0x0000000000401ffc 0x0000000000401ffc 0x000004
0x000004 R 0x1
Section to Segment mapping:
Segment Sections...
00 .text
01 .data.rel.ro .data
02 .data.rel.ro
[hjl@gnu-tgl-3 pr28743-2]$
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