[LTP] [PATCH v2] mprotect04: Support execute-only page access permissions

[Jan Stancek <jstancek@redhat.com>]

----- Original Message -----
> Linux version 4.9 introduced support for execute-only page access permissions
> on
> arm64. As a result, user space processes, by default, cannot read from
> their own .text sections. This change adds an extra call to mprotect()
> to explicitly change access protections to allow relevant parts of the
> .text section to be read.
> 
> Without this change, mprotect04 generates false TBROK results. We
> previously saw this test output:
> 
> mprotect04    1  TPASS  :  test PROT_NONE for mprotect success
> mprotect04    0  TINFO  :  exec_func: 0x5ac82d3588, page_to_copy:
> 0x5ac82d3000
> mprotect04    2  TBROK  :
> ltp/testcases/kernel/syscalls/mprotect/mprotect04.c:236: page_to_copy not
> present
> mprotect04    3  TBROK  :
> ltp/testcases/kernel/syscalls/mprotect/mprotect04.c:236: Remaining cases
> broken
> 
> Signed-off-by: Daniel Mentz <danielmentz@google.com>

Pushed with minor tweaks so it applies to my v3.

Thanks,
Jan