tree 9708e8a748345dd8e073a081a3027a3a5858e487
parent e3b75b21e4d6cf5e6276ec0637c0429a9e2b5829
author Will Deacon <will.deacon@arm.com> 1512559442 +0000
committer Todd Kjos <tkjos@google.com> 1515432731 -0800

FROMLIST: arm64: kaslr: Put kernel vectors address in separate data page

The literal pool entry for identifying the vectors base is the only piece
of information in the trampoline page that identifies the true location
of the kernel.

This patch moves it into a page-aligned region of the .rodata section
and maps this adjacent to the trampoline text via an additional fixmap
entry, which protects against any accidental leakage of the trampoline
contents.

Suggested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Laura Abbott <labbott@redhat.com>
Tested-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
(cherry picked from git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git
 commit 6c27c4082f4f70b9f41df4d0adf51128b40351df)

Change-Id: Iffe72dc5e7ee171d83a7b916a16146e35ddf904e
[ghackmann@google.com:
 - adjust context
 - replace ARM64_WORKAROUND_QCOM_FALKOR_E1003 alternative with
   compile-time CONFIG_ARCH_MSM8996 check]
Signed-off-by: Greg Hackmann <ghackmann@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>