[PATCH] posix: Fix posix_spawnpi to not execute invalid binaries in non compat mode (BZ#23264)

[Florian Weimer]

On 06/06/2018 08:11 PM, Adhemerval Zanella wrote:
> Current posix_spawnp implementation wrongly tries to execute invalid
> binaries (for instance script without shebang) as a shell script in
> non compat mode.  It was a regression introduced by
> 9ff72da471a509a8c19791efe469f47fa6977410 when __spawni started to use
> __execvpe instead of __execve (glibc __execvpe try to execute ENOEXEC
> as shell script regardless).
> 
> This patch fixes it by using an internal symbol (__execvpex) with the
> faulty semantic (since compat mode is handled by spawni.c itself).

Why doesn't this need a new compatibility symbol, similar to the 
previously attempted change?

Thanks,
Florian