Aaron Durbin 12dac6c097 UPSTREAM: util/cbmem: mmap underflow on low addresses ... There is code to adjust the mapping down if a mmap fails at a physical address. However, if the address is less than the page size of the system then the physical offset will underflow. This can actually cause a kernel panic on when operating on /dev/mem. The failing condition happens when the requested mapping at 0 fails in the kernel. The fallback path is taken and page size is subtracted from 0 making a very large offset. The PAT code in the kernel fails with a BUG_ON in reserve_memtype() checking start >= end. The kernel needs to be fixed as well, but this fallback path is wrong as well. BUG=b:38211793 Change-Id: Idd5b22027633e5e1febd140336244f25a5304de4 Signed-off-by: Patrick Georgi <pgeorgi@google.com> Original-Commit-Id: 7ad44eed08 Original-Change-Id: I32b0c15b2f1aa43fc57656d5d2d5f0e4e90e94ef Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org> Original-Reviewed-on: https://review.coreboot.org/19679 Original-Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Original-Reviewed-by: Patrick Georgi <pgeorgi@google.com> Original-Reviewed-by: Philippe Mathieu-Daud <philippe.mathieu.daude@gmail.com> Original-Reviewed-by: Julius Werner <jwerner@chromium.org> Original-Reviewed-by: Furquan Shaikh <furquan@google.com> Original-Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-on: https://chromium-review.googlesource.com/506197 Commit-Ready: Patrick Georgi <pgeorgi@chromium.org> Tested-by: Patrick Georgi <pgeorgi@chromium.org> Reviewed-by: Patrick Georgi <pgeorgi@chromium.org>		2017-05-16 10:41:44 -07:00
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cbmem.c	UPSTREAM: util/cbmem: mmap underflow on low addresses	2017-05-16 10:41:44 -07:00
Makefile	UPSTREAM: Remove extra newlines from the end of all coreboot files.	2016-08-04 23:36:56 -07:00