https://sourceware.org/bugzilla/show_bug.cgi?id=16323
Bug ID: 16323
Summary: strip changes PT_LOAD segment generated by gold
Product: binutils
Version: 2.25 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
[hjl@gnu-6 pr16322]$ cat x.c
extern void f1 (void);
void * const p1[1] __attribute__ ((aligned(8))) = { &f1 };
[hjl@gnu-6 pr16322]$ make
gcc -m32 -O2 -fPIC -c -o x.o x.c
ld.gold -melf_i386 -shared --gc-sections -z relro -o libx.so x.o
readelf -lS libx.so
There are 12 section headers, starting at offset 0x1168:
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf
Al
[ 0] NULL 00000000 000000 000000 00 0 0
0
[ 1] .dynsym DYNSYM 000000f4 0000f4 000060 10 A 2 1
4
[ 2] .dynstr STRTAB 00000154 000154 00001f 00 A 0 0
1
[ 3] .hash HASH 00000174 000174 00002c 04 A 1 0
4
[ 4] .rel.dyn REL 000001a0 0001a0 000008 08 A 1 0
4
[ 5] .data.rel.ro PROGBITS 00001f88 000f88 000004 00 WA 0 0
8
[ 6] .dynamic DYNAMIC 00001f8c 000f8c 000070 08 WA 2 0
4
[ 7] .comment PROGBITS 00000000 001000 00002d 01 MS 0 0
1
[ 8] .note.gnu.gold-ve NOTE 00000000 001030 00001c 00 0 0
4
[ 9] .symtab SYMTAB 00000000 00104c 000080 10 10 3
4
[10] .strtab STRTAB 00000000 0010cc 00002c 00 0 0
1
[11] .shstrtab STRTAB 00000000 0010f8 000070 00 0 0
1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
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 6 program headers, starting at offset 52
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
PHDR 0x000034 0x00000034 0x00000034 0x000c0 0x000c0 R 0x4
LOAD 0x000000 0x00000000 0x00000000 0x001a8 0x001a8 R 0x1000
LOAD 0x000f88 0x00001f88 0x00001f88 0x00078 0x00078 RW 0x1000
DYNAMIC 0x000f8c 0x00001f8c 0x00001f8c 0x00070 0x00070 RW 0x4
GNU_STACK 0x000000 0x00000000 0x00000000 0x00000 0x00000 RW 0
GNU_RELRO 0x000f88 0x00001f88 0x00001f88 0x00078 0x00078 RW 0x8
Section to Segment mapping:
Segment Sections...
00
01 .dynsym .dynstr .hash .rel.dyn
02 .data.rel.ro .dynamic
03 .dynamic
04
05 .data.rel.ro .dynamic
[hjl@gnu-6 pr16322]$ strip libx.so
[hjl@gnu-6 pr16322]$ readelf -SlW libx.so
There are 10 section headers, starting at offset 0x10a8:
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf
Al
[ 0] NULL 00000000 000000 000000 00 0 0
0
[ 1] .dynsym DYNSYM 000000f4 0000f4 000060 10 A 2 1
4
[ 2] .dynstr STRTAB 00000154 000154 00001f 00 A 0 0
1
[ 3] .hash HASH 00000174 000174 00002c 04 A 1 0
4
[ 4] .rel.dyn REL 000001a0 0001a0 000008 08 A 1 0
4
[ 5] .data.rel.ro PROGBITS 00001f88 000f88 000004 00 WA 0 0
8
[ 6] .dynamic DYNAMIC 00001f8c 000f8c 000070 08 WA 2 0
4
[ 7] .comment PROGBITS 00000000 000ffc 00002d 01 MS 0 0
1
[ 8] .note.gnu.gold-version NOTE 00000000 00102c 00001c 00 0
0 4
[ 9] .shstrtab STRTAB 00000000 001048 000060 00 0 0
1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
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 6 program headers, starting at offset 52
Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
PHDR 0x000034 0x00000034 0x00000034 0x000c0 0x000c0 R 0x4
LOAD 0x000000 0x00000000 0x00000000 0x001a8 0x001a8 R 0x1000
LOAD 0x000f88 0x00001f88 0x00001f88 0x00074 0x00074 RW 0x1000
DYNAMIC 0x000f8c 0x00001f8c 0x00001f8c 0x00070 0x00070 RW 0x4
GNU_STACK 0x000000 0x00000000 0x00000000 0x00000 0x00000 RW 0
GNU_RELRO 0x000f88 0x00001f88 0x00001f88 0x00078 0x00078 RW 0x8
Section to Segment mapping:
Segment Sections...
00
01 .dynsym .dynstr .hash .rel.dyn
02 .data.rel.ro .dynamic
03 .dynamic
04
05 .data.rel.ro .dynamic
[hjl@gnu-6 pr16322]$
strip changes
LOAD 0x000f88 0x00001f88 0x00001f88 0x00078 0x00078 RW 0x1000
to
LOAD 0x000f88 0x00001f88 0x00001f88 0x00074 0x00074 RW 0x1000
It makes
GNU_RELRO 0x000f88 0x00001f88 0x00001f88 0x00078 0x00078 RW 0x8
bigger than its PT_LOAD segment.
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