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

[hjl.tools at gmail dot com]

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

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
   Last reconfirmed|                            |2016-12-02
         Resolution|INVALID                     |---
     Ever confirmed|0                           |1

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
The problem is that the internal MPX wrapper calls in libmpxwrappers.so:

(gdb) disass
Dump of assembler code for function __mpx_wrapper_memcpy:
=> 0x00007ffff79d1120 <+0>:     sub    $0x8,%rsp
   0x00007ffff79d1124 <+4>:     bnd callq 0x7ffff79cfb50
<__mpx_wrapper_memmove@plt>
   0x00007ffff79d112a <+10>:    add    $0x8,%rsp
   0x00007ffff79d112e <+14>:    bnd retq 
End of assembler dump.

(gdb) disass
Dump of assembler code for function __mpx_wrapper_memmove@plt:
=> 0x00007ffff79cfb50 <+0>:     jmpq   *0x2024c2(%rip)        # 0x7ffff7bd2018
   0x00007ffff79cfb56 <+6>:     pushq  $0x0
   0x00007ffff79cfb5b <+11>:    jmpq   0x7ffff79cfb40
End of assembler dump.