ltp: don't memcpy into function pointers.
This cherry-picks the following two commits:
commit beea06f31d0fd8c9000768c237a23d4ab3d01456
Author: Cyril Hrubis <chrubis@suse.cz>
Date: Wed Sep 2 16:43:42 2015 +0200
syscalls/mprotect04: Fix for ia64
IA64 ABI calls functions by function descriptors and because of that we
cannot simply copy function address since the address we get in C is
addres of the function descriptor and not the function itself.
Instead of that we copy a code for a minimal function to the mmaped page
and create a function descriptor for it.
Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
commit e2b6ca1179cd96b77e32fd0fa281bb0491f7d80d
Author: Jan Stancek <jstancek@redhat.com>
Date: Wed Sep 9 13:00:01 2015 +0200
mprotect04: fix powerpc crash when copying exec_func
Testcase tried to copy page size area starting at &exec_func.
This results in crash on powerpc, because &exec_func is too close
to end of page and subsequent page is not mapped:
10000000-10010000 r-xp 00000000 fd:00 402855 mprotect04
10010000-10020000 rw-p 00000000 fd:00 402855 mprotect04
806a410000-806a440000 r-xp 00000000 fd:00 2097827 /lib64/ld-2.12.so
where &exec_func == 0x100199c0, and page_size == 65536.
It's also worth noting, that function ptr does not reside in .text,
but in .opd section. That shouldn't matter for this testcase as long
as it doesn't try to copy non-existent pages.
This patch is changing copy function to try copy 2 whole aligned pages.
Both pages are checked to be present in memory before memcpy is
attempted. First is the page which contains &exec_func, and 2nd is the
subsequent page - for the case &exec_func is too close to page boundary.
Signed-off-by: Jan Stancek <jstancek@redhat.com>
Acked-by: Cyril Hrubis <chrubis@suse.cz>
BUG=chromium:638456
TEST=emerge-x86-generic with clang-FORTIFY enabled is now happy about memcpy.
Change-Id: I0f77b9c4b5baa8edfbc7062c4fc9fb324aacb20e
Reviewed-on: https://chromium-review.googlesource.com/374860
Commit-Ready: George Burgess <gbiv@google.com>
Tested-by: George Burgess <gbiv@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed
