CVS commit: src/sys/arch

["Kamil Rytarowski" <kamil%netbsd.org@localhost>]

Module Name:    src
Committed By:   kamil
Date:           Mon Sep 23 23:06:26 UTC 2019

Modified Files:
        src/sys/arch/amd64/include: types.h
        src/sys/arch/i386/include: types.h

Log Message:
Disable __NO_STRICT_ALIGNMENT on amd64/i386 for UBSan builds

This change allows to pick code paths in the kernel that are tuned for
alignment sensitive (and stricted in C meaning) code paths. In particular
the IPv6 code uses this heavily and skips whenever possible the process
of aligning of networking data.

With this modification all ATF tests are executed on amd64 without
triggering any UBSan reports in dmesg.

In theory __NO_STRICT_ALIGNMENT could be tuned for vax and m68k, however
these machines are still unsupported in LLVM sanitizers and syzkaller.

sys/netinet6/scope6.c:404:6, member access within misaligned address 0xfffffaea81276086 for type 'struct in6_addr' which requires 4 byte alignment
Reported-by: syzbot+a86f58d17685317b3df9%syzkaller.appspotmail.com@localhost

sys/net/rtsock_shared.c:629:41, member access within misaligned address 0xffffddb5db3ff04c for type 'struct rt_msghdr50' which requires 8 byte alignment
Reported-by: syzbot+0a3a022bc9d2b8880c16%syzkaller.appspotmail.com@localhost


To generate a diff of this commit:
cvs rdiff -u -r1.61 -r1.62 src/sys/arch/amd64/include/types.h
cvs rdiff -u -r1.89 -r1.90 src/sys/arch/i386/include/types.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.