[Bug binutils/16323] New: strip changes PT_LOAD segment generated by gold

[hjl.tools at gmail dot com]

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

address@hidden pr16322]$ cat x.c
extern void f1 (void);
void * const p1[1] __attribute__ ((aligned(8))) = { &f1 };
address@hidden 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 
address@hidden pr16322]$ strip libx.so
address@hidden 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 
address@hidden 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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