tree 0d0ebe94545d165b8cb05ec8d4439bd36fbe3aa7
parent 49b4fce967a4721bd9617e455be4d51583f1aa1d
author Jerry Zhang <zhangjerry@google.com> 1520378827 -0800
committer Elliott Hughes <enh@google.com> 1520447460 -0800

Sign extend offset for pwritev/preadv.

Kernel expects a 64 bit offset, so if a
user's offset is 32 bit, the wrapper will
drop the sign. To fix, sign extend the
32 bit value before doing the syscall.

Bug: 31225071
Test: pwritev02 32 bit passes

(cherry picked from commit f55dbc05169ebfb67a4380741a94360b794f5ad9)

Change-Id: Ie81d29a37cf4e99c9279cffc89f4fa1b4da9a898