Re: [Tinycc-devel] Segfault due to ebaa5c8 dynamic executables (PIE)

[grischka]

On 06.08.2022 21:35, Arthur Williams via Tinycc-devel wrote:
> Was trying to compile X and noticed that it failed building hw/xfree86/
>
> Turns out tcc was segfaulting by trying to deference a null address.
> Bisected mob to conclude that this regression was introduced by
> `ebaa5c8 dynamic executables (PIE)`.
>
> Also built tcc with its backtracing support and re-ran to get the
> following output:
> ```
> 7f282ff1293c : by ???
> tccelf.c:311: by section_ptr_add
> tccdbg.c:453: by put_stabs
> tccdbg.c:477: by put_stabn
> ```

"tcc -E -g ..." I'd think almost.

> And putting that all together, `section_ptr_add` received a null `Section`
> which implies `stab_section` is null. Double-checked this conclusion by
> adding an assert.
> Not too familiar with this part of the code so thought I'd just share my
> observations.
>
> Arthur