Loader crashes when 'Strip binaries' is used

[Martin Sucha]

When 'Strip binaries' is selected, the boot process stops after printing "Spawning /srv/locfs".

The output is different on each architecture. Attached screenshot from amd64.

Tested mainline,1440 compiled with GCC 4.6.3 on

• amd64 (QEMU 1.0.1)
• sparc64 (QEMU 1.0.1)
• mips32 (GXemul)

[Martin Sucha]

Screenshot of the problem on amd64

[Jakub Jermář]

The problem seems to be in stripping the loader binary. If loader is not stripped, but everything else is, the system boots and operates just fine.

[Jiri Svoboda]

For the loader binary, and for the loader binary alone, strip prints out some warnings:

/usr/local/cross/amd64/bin/amd64-linux-gnu-strip loader
BFD: st4kO0FA: section .init lma 0x70001120 adjusted to 0x70002120
BFD: st4kO0FA: section .text lma 0x70001140 adjusted to 0x7000212a
BFD: st4kO0FA: section `.text' can't be allocated in segment 1
LOAD: .init .text

[Jiri Svoboda]

Some things appear to be wrong with the stripped file:

kvadrat loader # readelf -l loader.orig 

Elf file type is EXEC (Executable file)
Entry point 0x70001120
There are 4 program headers, starting at offset 64

Program Headers:
  Type           Offset             VirtAddr           PhysAddr
                 FileSiz            MemSiz              Flags  Align
  INTERP         0x00000000000145a8 0x0000000000000000 0x0000000000000000
                 0x0000000000000007 0x0000000000000000  R      1
      [Requesting program interpreter: kernel]
  LOAD           0x0000000000000000 0x0000000070001000 0x0000000070001000
                 0x00000000000141cc 0x00000000000141cc  R E    20
  LOAD           0x00000000000141e0 0x00000000700161e0 0x00000000700161e0
                 0x00000000000003c8 0x0000000000000670  RW     20
  NOTE           0x0000000000000000 0x0000000000000000 0x0000000000000000
                 0x0000000000000000 0x0000000000000000         8

 Section to Segment mapping:
  Segment Sections...
   00     .interp 
   01     .init .text 
   02     .data .bss 
   03     
kvadrat loader # readelf -l loader

Elf file type is EXEC (Executable file)
Entry point 0x70001120
There are 4 program headers, starting at offset 64

Program Headers:
  Type           Offset             VirtAddr           PhysAddr
                 FileSiz            MemSiz              Flags  Align
  INTERP         0x0000000000000000 0x0000000000000000 0x0000000000000000
                 0x0000000000000000 0x0000000000000000  R      8
      [Requesting program interpreter: ELF]
  LOAD           0x0000000000000000 0x0000000070000000 0x0000000070001000
                 0x00000000000151b6 0x00000000000151b6  R E    200000
  LOAD           0x00000000000161e0 0x00000000700161e0 0x00000000700161e0
                 0x00000000000003c8 0x0000000000000670  RW     200000
  NOTE           0x0000000000000000 0x0000000000000000 0x0000000000000000
                 0x0000000000000000 0x0000000000000000         8

 Section to Segment mapping:
  Segment Sections...
   00     
   01     .init 
   02     .data .bss 
   03     

[Jakub Jermář]

Yeah, if the .interp section is marked as allocable ("a") and @note or @progbits, the interpreter string "kernel" is not stripped and everything works.

[Jakub Jermář]

Fixed in mainline,1564.