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13 August 2024, 17:29:01 UTC
Revision b299cde245b0b76c977f4291162cf668e087b408 authored by Julius Werner on 12 May 2017, 21:42:58 UTC, committed by Greg Kroah-Hartman on 18 May 2017, 14:53:55 UTC 
drivers: char: mem: Check for address space wraparound with mmap()
 
/dev/mem currently allows mmap() mappings that wrap around the end of
the physical address space, which should probably be illegal. It
circumvents the existing STRICT_DEVMEM permission check because the loop
immediately terminates (as the start address is already higher than the
end address). On the x86_64 architecture it will then cause a panic
(from the BUG(start >= end) in arch/x86/mm/pat.c:reserve_memtype()).

This patch adds an explicit check to make sure offset + size will not
wrap around in the physical address type.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 parent 0d83539
History
Tip revision: b299cde245b0b76c977f4291162cf668e087b408 authored by Julius Werner on 12 May 2017, 21:42:58 UTC
drivers: char: mem: Check for address space wraparound with mmap()
Tip revision: b299cde
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