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linux/arch/arm64
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Mark Rutland e817a7fb2f arm64: uaccess: ensure extension of access_ok() addr 
commit a06040d7a7 upstream.

Our access_ok() simply hands its arguments over to __range_ok(), which
implicitly assummes that the addr parameter is 64 bits wide. This isn't
necessarily true for compat code, which might pass down a 32-bit address
parameter.

In these cases, we don't have a guarantee that the address has been zero
extended to 64 bits, and the upper bits of the register may contain
unknown values, potentially resulting in a suprious failure.

Avoid this by explicitly casting the addr parameter to an unsigned long
(as is done on other architectures), ensuring that the parameter is
widened appropriately.

Fixes: 0aea86a217 ("arm64: User access library functions")
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2017-05-25 15:44:45 +02:00
..
boot arm64: dts: hi6220: Reset the mmc hosts 2017-05-25 15:44:44 +02:00
configs ZTE arm64 defconfig updates for 4.9: 2016-09-19 22:35:21 +02:00
crypto crypto: arm64/aes-blk - honour iv_out requirement in CBC and CTR modes 2017-02-09 08:08:26 +01:00
include arm64: uaccess: ensure extension of access_ok() addr 2017-05-25 15:44:45 +02:00
kernel arm64: armv8_deprecated: ensure extension of addr 2017-05-25 15:44:45 +02:00
kvm arm64: KVM: Do not use stack-protector to compile EL2 code 2017-05-25 15:44:43 +02:00
lib Merge branch 'work.uaccess' into for-linus 2016-10-14 20:42:44 -04:00
mm arm64: mm: unaligned access by user-land should be received as SIGBUS 2017-04-12 12:41:11 +02:00
net bpf, arm64: fix jit branch offset related to ldimm64 2017-05-14 14:00:21 +02:00
xen arm/xen: add support for vm_assist hypercall 2016-07-06 10:42:14 +01:00
Kconfig irqchip/gicv3-its: Add workaround for QDF2400 ITS erratum 0065 2017-03-22 12:43:39 +01:00
Kconfig.debug arm64: always enable DEBUG_RODATA and remove the Kconfig option 2016-08-26 10:13:41 +01:00
Kconfig.platforms arm64: uniphier: select ARCH_HAS_RESET_CONTROLLER 2016-10-22 18:25:52 +09:00
Makefile arm64: kernel: force ET_DYN ELF type for CONFIG_RELOCATABLE=y 2016-10-20 11:37:25 +01:00