linux_dsm_epyc7002/arch/arm64/include
Mark Rutland 76624175dc arm64: uaccess: consistently check object sizes
Currently in arm64's copy_{to,from}_user, we only check the
source/destination object size if access_ok() tells us the user access
is permissible.

However, in copy_from_user() we'll subsequently zero any remainder on
the destination object. If we failed the access_ok() check, that applies
to the whole object size, which we didn't check.

To ensure that we catch that case, this patch hoists check_object_size()
to the start of copy_from_user(), matching __copy_from_user() and
__copy_to_user(). To make all of our uaccess copy primitives consistent,
the same is done to copy_to_user().

Cc: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-02-08 19:32:54 +00:00
..
asm arm64: uaccess: consistently check object sizes 2017-02-08 19:32:54 +00:00
uapi/asm arm64: Advertise support for Rounding double multiply instructions 2017-01-12 17:19:06 +00:00