https://sourceware.org/bugzilla/show_bug.cgi?id=16322
Bug ID: 16322
Summary: ld fails to generate GNU_RELRO segment
Product: binutils
Version: 2.25 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
[hjl@gnu-6 relro-6]$ cat x.c
extern void f1 (void);
#if 1
void * const p1 __attribute__ ((aligned(32))) = &f1;
#else
void * const p1 = &f1;
#endif
[hjl@gnu-6 relro-6]$ make libx.so LD=ld
gcc -fuse-ld=gold -B./ -O2 -fPIC -c -o x.o x.c
ld -shared --gc-sections -z relro -o libx.so x.o
[hjl@gnu-6 relro-6]$ readelf -SWl libx.so
There are 12 section headers, starting at offset 0x1078:
Section Headers:
[Nr] Name Type Address Off Size ES Flg
Lk Inf Al
[ 0] NULL 0000000000000000 000000 000000 00
0 0 0
[ 1] .hash HASH 0000000000000120 000120 000030 04 A
2 0 8
[ 2] .dynsym DYNSYM 0000000000000150 000150 0000a8 18 A
3 2 8
[ 3] .dynstr STRTAB 00000000000001f8 0001f8 00001f 00 A
0 0 1
[ 4] .rela.dyn RELA 0000000000000218 000218 000018 18 A
2 0 8
[ 5] .eh_frame PROGBITS 0000000000000230 000230 000000 00 A
0 0 8
[ 6] .data.rel.ro PROGBITS 0000000000200f00 000f00 000008 00 WA
0 0 32
[ 7] .dynamic DYNAMIC 0000000000200f08 000f08 0000e0 10 WA
3 0 8
[ 8] .comment PROGBITS 0000000000000000 000fe8 00002c 01 MS
0 0 1
[ 9] .shstrtab STRTAB 0000000000000000 001014 000064 00
0 0 1
[10] .symtab SYMTAB 0000000000000000 001378 0001b0 18
11 16 8
[11] .strtab STRTAB 0000000000000000 001528 000042 00
0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings), l (large)
I (info), L (link order), G (group), T (TLS), E (exclude), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific)
Elf file type is DYN (Shared object file)
Entry point 0x0
There are 4 program headers, starting at offset 64
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz
Flg Align
LOAD 0x000000 0x0000000000000000 0x0000000000000000 0x000230
0x000230 R 0x200000
LOAD 0x000f00 0x0000000000200f00 0x0000000000200f00 0x0000e8
0x0000e8 RW 0x200000
DYNAMIC 0x000f08 0x0000000000200f08 0x0000000000200f08 0x0000e0
0x0000e0 RW 0x8
GNU_STACK 0x000000 0x0000000000000000 0x0000000000000000 0x000000
0x000000 RW 0x10
Section to Segment mapping:
Segment Sections...
00 .hash .dynsym .dynstr .rela.dyn
01 .data.rel.ro .dynamic
02 .dynamic
03
[hjl@gnu-6 relro-6]$
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