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

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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>

...

This commit is contained in:

Will Deacon 2017-12-06 11:24:02 +00:00

parent b519538dfe

commit 6c27c4082f

4 changed files with 28 additions and 2 deletions

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1

arch/arm64/include/asm/fixmap.h

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14

arch/arm64/kernel/entry.S

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5

arch/arm64/kernel/vmlinux.lds.S

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10

arch/arm64/mm/mmu.c

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