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authorAaron Durbin <adurbin@chromium.org>2017-05-12 09:55:16 -0500
committerAaron Durbin <adurbin@chromium.org>2017-05-15 19:45:49 +0200
commit7ad44eed08b9811d97462b3c990129187f77e2ca (patch)
tree67effd79628fabf547a49b05cc95fee6e900d1f3 /src/drivers/uart/Makefile.inc
parenta7092750b2c7856f72016dd0b468f1a1d0585b5a (diff)
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: I32b0c15b2f1aa43fc57656d5d2d5f0e4e90e94ef Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://review.coreboot.org/19679 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Patrick Georgi <pgeorgi@google.com> Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com> Reviewed-by: Julius Werner <jwerner@chromium.org> Reviewed-by: Furquan Shaikh <furquan@google.com> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
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