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05 April 2024, 19:05:47 UTC
Revision 4a23e56ad6549d0b8c0fac6d9eb752884379c391 authored by Ard Biesheuvel on 18 August 2017, 17:42:30 UTC, committed by Will Deacon on 22 August 2017, 17:15:42 UTC 
arm64: kaslr: ignore modulo offset when validating virtual displacement
 
In the KASLR setup routine, we ensure that the early virtual mapping
of the kernel image does not cover more than a single table entry at
the level above the swapper block level, so that the assembler routines
involved in setting up this mapping can remain simple.

In this calculation we add the proposed KASLR offset to the values of
the _text and _end markers, and reject it if they would end up falling
in different swapper table sized windows.

However, when taking the addresses of _text and _end, the modulo offset
(the physical displacement modulo 2 MB) is already accounted for, and
so adding it again results in incorrect results. So disregard the modulo
offset from the calculation.

Fixes: 08cdac619c81 ("arm64: relocatable: deal with physically misaligned ...")
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
1 parent 289d07a
History
Tip revision: 4a23e56ad6549d0b8c0fac6d9eb752884379c391 authored by Ard Biesheuvel on 18 August 2017, 17:42:30 UTC
arm64: kaslr: ignore modulo offset when validating virtual displacement
Tip revision: 4a23e56
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.cocciconfig -rw-r--r-- 59 bytes
.get_maintainer.ignore -rw-r--r-- 31 bytes
.gitattributes -rw-r--r-- 30 bytes
.gitignore -rw-r--r-- 1.3 KB
.mailmap -rw-r--r-- 8.1 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 96.2 KB
Kbuild -rw-r--r-- 2.2 KB
Kconfig -rw-r--r-- 252 bytes
MAINTAINERS -rw-r--r-- 411.0 KB
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README -rw-r--r-- 722 bytes

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