RE: Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move rw_copy_check_uvector() into lib/iov_iter.c"
From: David Laight <hidden>
Date: 2020-10-22 22:04:11
Also in:
io-uring, keyrings, linux-arch, linux-arm-kernel, linux-block, linux-fsdevel, linux-mips, linux-mm, linux-s390, linux-scsi, linux-security-module, lkml, netdev, sparclinux
From: Nick Desaulniers
Sent: 22 October 2020 20:05
...
Passing an `unsigned long` as an `unsigned int` does no such narrowing: https://godbolt.org/z/TvfMxe (same vice-versa, just tail calls, no masking instructions).
Right but is the called function going to use 32bit ops and/or mask the register? Certainly that is likely on x86-64. I've rather lost track of where the masking is expected to happen. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)