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author | James Hogan <james.hogan@imgtec.com> | 2017-03-31 11:14:02 +0100 |
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committer | James Hogan <james.hogan@imgtec.com> | 2017-04-05 15:25:02 +0100 |
commit | 563ddc1076109f2b3f88e6d355eab7b6fd4662cb (patch) | |
tree | a28dd6bc34d9b593aa275e0a90beccf574f7fe6d /README | |
parent | fb8ea062a8f2e85256e13f55696c5c5f0dfdcc8b (diff) | |
download | linux-563ddc1076109f2b3f88e6d355eab7b6fd4662cb.tar.bz2 |
metag/usercopy: Zero rest of buffer from copy_from_user
Currently we try to zero the destination for a failed read from userland
in fixup code in the usercopy.c macros. The rest of the destination
buffer is then zeroed from __copy_user_zeroing(), which is used for both
copy_from_user() and __copy_from_user().
Unfortunately we fail to zero in the fixup code as D1Ar1 is set to 0
before the fixup code entry labels, and __copy_from_user() shouldn't even
be zeroing the rest of the buffer.
Move the zeroing out into copy_from_user() and rename
__copy_user_zeroing() to raw_copy_from_user() since it no longer does
any zeroing. This also conveniently matches the name needed for
RAW_COPY_USER support in a later patch.
Fixes: 373cd784d0fc ("metag: Memory handling")
Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-metag@vger.kernel.org
Cc: stable@vger.kernel.org
Diffstat (limited to 'README')
0 files changed, 0 insertions, 0 deletions