http://sourceware.org/bugzilla/show_bug.cgi?id=14215
Bug #: 14215
Summary: ld creates bad GNU_RELRO segment
Product: binutils
Version: 2.23 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
AssignedTo: unassig...@sourceware.org
ReportedBy: hjl.to...@gmail.com
Classification: Unclassified
[hjl@gnu-6 relro-1]$ cat y.s
.section .got
.space 0x2a8, 4
.data
.zero 12
[hjl@gnu-6 relro-1]$ make
as --32 -o y.o y.s
./ld -m elf_i386 -z relro -shared -o y.so y.o
readelf -lW y.so
Elf file type is DYN (Shared object file)
Entry point 0x134
There are 4 program headers, starting at offset 52
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
LOAD 0x000000 0x00000000 0x00000000 0x00134 0x00134 R 0x1000
LOAD 0x000cf4 0x00001cf4 0x00001cf4 0x0030c 0x0030c RW 0x1000
DYNAMIC 0x000cf4 0x00001cf4 0x00001cf4 0x00058 0x00058 RW 0x4
GNU_RELRO 0x000cf4 0x00001cf4 0x00001cf4 0x0030c 0x0030c R 0x1
Section to Segment mapping:
Segment Sections...
00 .hash .dynsym .dynstr
01 .dynamic .got .data
02 .dynamic
03 .dynamic .got .data
[hjl@gnu-6 relro-1]$
.data section is included in GNU_RELRO segment. The
problem is caused by
. = DATA_SEGMENT_RELRO_END (12, .);
It assumes the next 12 bytes after .got must be in .got.plt
section. But it fails to check if the next section is .got.plt
section.
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