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static-pie: Skip the empty PT_LOAD segment at offset 0 [BZ #32763]

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As shown in

https://sourceware.org/bugzilla/show_bug.cgi?id=25237

linker may generate an empty PT_LOAD segments at offset 0:

Elf file type is EXEC (Executable file)
Entry point 0x4000e8
There are 3 program headers, starting at offset 64

Program Headers:
  Type           Offset             VirtAddr           PhysAddr
                 FileSiz            MemSiz              Flags  Align
  LOAD           0x0000000000000000 0x0000000000400000 0x0000000000400000
                 0x00000000000000f0 0x00000000000000f0  R E    0x1000
  LOAD           0x0000000000000000 0x0000000000410000 0x0000000000410000
                 0x0000000000000000 0x0000000000b5dce8  RW     0x10000
  GNU_STACK      0x0000000000000000 0x0000000000000000 0x0000000000000000
                 0x0000000000000000 0x0000000000000000  RW     0x10

 Section to Segment mapping:
  Segment Sections...
   00     .text
   01     .bss
   02

Skip the empty PT_LOAD segment at offset 0 to support such binaries.
This fixes BZ #32763.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Sam James <sam@gentoo.org>
This commit is contained in:
H.J. Lu
2025-03-05 10:19:59 +08:00
parent 50351e0570
commit 596130591a
4 changed files with 56 additions and 1 deletions
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3
elf/dl-reloc-static-pie.c
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@@ -51,7 +51,8 @@ _dl_relocate_static_pie (void)
switch (ph->p_type)
{
case PT_LOAD:
if (ph->p_offset == 0)
/* Skip the empty PT_LOAD segment at offset 0. */
if (ph->p_filesz != 0 && ph->p_offset == 0)
file_p_vaddr = ph->p_vaddr;
break;
case PT_DYNAMIC: