[PATCH] D75225: [ELF] Keep orphan section names (.rodata.foo .text.foo) unchanged if !hasSectionsCommand

[Fangrui Song via Phabricator via llvm-commits]

MaskRay added a comment.

In D75225#1895813 <https://reviews.llvm.org/D75225#1895813>, @kees wrote:

> > .text.* -> .text
>
> This is not accurate: ld.bfd will keep the .text.$foo names, but place them all after the .text (it does not merge them into .text). Currently, ld.lld seems to merge them into .text. FGKASLR depends on the non-merging behavior.


I think the description is correct. I have a line `// If a SECTIONS command is not specified` in the code block.

Here is GNU ld's internal linker script:

  .text           :
  {
    *(.text.unlikely .text.*_unlikely .text.unlikely.*)
    *(.text.exit .text.exit.*)
    *(.text.startup .text.startup.*)
    *(.text.hot .text.hot.*)
    *(.text .stub .text.* .gnu.linkonce.t.*)
    /* .gnu.warning sections are handled specially by elf32.em.  */
    *(.gnu.warning)
  }

(As you can see, `-z keep-text-section-prefix` does less than what GNU ld does. One issue with GNU ld's internal linker script is that -ffunction-sections (typical when building a libc) will cause the function `exit` to be reordered before others...)


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  https://reviews.llvm.org/D75225/new/

https://reviews.llvm.org/D75225