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author | Mark Rutland <mark.rutland@arm.com> | 2017-05-03 15:09:35 (GMT) |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-25 13:44:45 (GMT) |
commit | e817a7fb2f31c2fafc8e6e2dbf649bbd65b2f604 (patch) | |
tree | ea2e47d70acc038b2fb945b721daec15d3af7053 /lib/crc32.c | |
parent | 4775fbcc92d79be414046dd208beb767ed5168e2 (diff) | |
download | linux-e817a7fb2f31c2fafc8e6e2dbf649bbd65b2f604.tar.xz |
arm64: uaccess: ensure extension of access_ok() addr
commit a06040d7a791a9177581dcf7293941bd92400856 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: 0aea86a2176c ("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>
Diffstat (limited to 'lib/crc32.c')
0 files changed, 0 insertions, 0 deletions