Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC

Commits:

• c71faa76
  by Luite Stegeman at 2025-12-01T03:16:05-05:00

  rts: Handle overflow of ELF section header string table
  
  If the section header string table is stored in a section greater
  than or equal to SHN_LORESERVE (0xff00), the 16-bit field e_shstrndx
  in the ELF header does not contain the section number, but rather
  an overflow value SHN_XINDEX (0xffff) indicating that we need to look
  elsewhere.
  
  This fixes the linker by not using e_shstrndx directly but calling
  elf_shstrndx, which correctly handles the SHN_XINDEX value.
  
  Fixes #26603
  

1 changed file:

• rts/linker/Elf.c

Changes:

     oc->info->sectionHeader = (Elf_Shdr *) ((uint8_t*)oc->image

                                             + oc->info->elfHeader->e_shoff);

     oc->info->sectionHeaderStrtab = (char*)((uint8_t*)oc->image +

-            oc->info->sectionHeader[oc->info->elfHeader->e_shstrndx].sh_offset);

+            oc->info->sectionHeader[elf_shstrndx(oc->info->elfHeader)].sh_offset);

     oc->n_sections = elf_shnum(oc->info->elfHeader);