[Bug target/78631] [Intel MPX] libmpxwrappers shared library leads to a non-bounds-preserving memcpy()

[ienkovich at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78631

--- Comment #11 from Ilya Enkovich <ienkovich at gcc dot gnu.org> ---
(In reply to H.J. Lu from comment #10)
> 
> MPX wrapper library isn't built with -z bndplt since it doesn't call
> external functions with bounds.  But some internal functions, which
> need bounds, are called via PLT which clear bounds.  It should call
> call those internal functions directly instead of via PLT.

Thanks for explanation. I thought we added '-fcheck-pointer-bounds -mmpx'
libmpxwrappers link flags but now I see we didn't. We also added tests to check
memcpy copies bounds correctly but didn't check memcpy detects bounds
violation. I suppose your patch is OK with such test added.