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author | Mark Rutland <mark.rutland@arm.com> | 2016-08-24 18:02:08 +0100 |
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committer | Amit Pundir <amit.pundir@linaro.org> | 2016-10-12 17:34:22 +0530 |
commit | feffbe70d5610268474c76f429fa9dc4e9696d70 (patch) | |
tree | 12ddb9abede28b09dcaa9bc1f533b8573caa9058 /README | |
parent | e54f34381d3ddb1947d17d937e9cf1b1515452c2 (diff) |
UPSTREAM: arm64: avoid TLB conflict with CONFIG_RANDOMIZE_BASE
When CONFIG_RANDOMIZE_BASE is selected, we modify the page tables to remap the
kernel at a newly-chosen VA range. We do this with the MMU disabled, but do not
invalidate TLBs prior to re-enabling the MMU with the new tables. Thus the old
mappings entries may still live in TLBs, and we risk violating
Break-Before-Make requirements, leading to TLB conflicts and/or other issues.
We invalidate TLBs when we uninsall the idmap in early setup code, but prior to
this we are subject to issues relating to the Break-Before-Make violation.
Avoid these issues by invalidating the TLBs before the new mappings can be
used by the hardware.
Fixes: f80fb3a3d508 ("arm64: add support for kernel ASLR")
Cc: <stable@vger.kernel.org> # 4.6+
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 30369029
Patchset: kaslr-arm64-4.4
(cherry picked from commit fd363bd417ddb6103564c69cfcbd92d9a7877431)
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
Change-Id: I6c23ce55cdd8b66587b6787b8f28df8535e39f24
Diffstat (limited to 'README')
0 files changed, 0 insertions, 0 deletions