diff options
author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2016-02-26 17:57:14 +0100 |
---|---|---|
committer | Jeff Vander Stoep <jeffv@google.com> | 2016-09-22 13:38:22 -0700 |
commit | ee97096e89bbb5f39614638bd32fded97eb08691 (patch) | |
tree | f75f56f9adff0fc9f7b53b650e920bcd5a8902d6 /arch/um/Kconfig.rest | |
parent | 09cbceb939d85d7d25b8e424445a2f83cac97c9d (diff) |
UPSTREAM: arm64: mm: treat memstart_addr as a signed quantity
Commit c031a4213c11 ("arm64: kaslr: randomize the linear region")
implements randomization of the linear region, by subtracting a random
multiple of PUD_SIZE from memstart_addr. This causes the virtual mapping
of system RAM to move upwards in the linear region, and at the same time
causes memstart_addr to assume a value which may be negative if the offset
of system RAM in the physical space is smaller than its offset relative to
PAGE_OFFSET in the virtual space.
Since memstart_addr is effectively an offset now, redefine its type as s64
so that expressions involving shifting or division preserve its sign.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 30369029
Patchset: kaslr-arm64-4.4
(cherry picked from commit 020d044f66874eba058ce8264fc550f3eca67879)
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
Change-Id: I0482ebc13baaa9005cf372795e656c2417be9d1c
Diffstat (limited to 'arch/um/Kconfig.rest')
0 files changed, 0 insertions, 0 deletions