ARM: move vector stubs

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Move the machine vector stubs into the page above the vector page,
which we can prevent from being visible to userspace.  Also move
the reset stub, and place the swi vector at a location that the
'ldr' can get to it.

This hides pointers into the kernel which could give valuable
information to attackers, and reduces the number of exploitable
instructions at a fixed address.

Cc: <stable@vger.kernel.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

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This commit is contained in:

Russell King 2013-07-04 11:40:32 +01:00

parent 5b43e7a383

commit 19accfd373

4 changed files with 37 additions and 30 deletions

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3

arch/arm/Kconfig

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50

arch/arm/kernel/entry-armv.S

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4

arch/arm/kernel/traps.c

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10

arch/arm/mm/mmu.c

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