CVS commit: src/common/lib/libc/misc

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

Module Name:    src
Committed By:   kamil
Date:           Fri Aug  3 02:05:43 UTC 2018

Added Files:
        src/common/lib/libc/misc: ubsan.c

Log Message:
Import micro-UBSan (ubsan.c)

This is a reimplementation of the Undefined Behavior Sanitizer with the
following properties:
 - pure C implementation,
 - no -fsanitize=vpts support, as it requires RTTI support and C++
   low-level routies to validate whether C++ objects are compatible
 - designed to be used inside libc and known as uUBSan or user-UBSan
 - designed to be shared with kernel and known as kUBSan or kernel-UBSan
 - designed to be usable with ATF tests as a standalone runtime,
   reachable without any MK* switches
 - designed to be safer for hardening as it does not have side effects on
   executables like writing to a selected location on demand
 - controllable with environment variable LIBC_UBSAN with options:
   * a - abort on report
   * A - do not abort on a report (unless a failure is unrecoverable)
   * e - output report to stderr
   * E - do not output report on stderr
   * l - output report on syslog (LOG_DEBUG | LOG_USER)
   * L - do not output report on syslog
   * o - output report on stdout
   * O - do not output report on stdout
   The default options are: "AeLO".
 - compatible with Clang (3.8, 7.x) and GCC (6.x) code generation
 - all handlers (except =vptr) from Clang/LLVM up to 7svn are supported

This file does not follow the regular KNF style, due to potential licensing
concerns.

Tested with Clang amd64+i386 and GCC amd64+i386.


To generate a diff of this commit:
cvs rdiff -u -r0 -r1.1 src/common/lib/libc/misc/ubsan.c

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