Coverage of signal routines in the kernel in the context of ptrace(2)


June 01, 2018 posted by Kamil Rytarowski

During the past month I have been working on coverage of various corner cases in the signal subsystem in the kernel. I have also spent some time on improvements in the land of sanitizers. As a mentor I was able to, thanks to the fulltime focus on NetBSD work, actively help three Google Summer of Code students. Not every question would be answered by myself without code reading but at least I am available for active collaboration, especially when it's to improve code that I have already authored, like sanitizers. At the end of the month we have managed to catch two uninitialized memory reads in the top(1) utility, using the Memory Sanitizer feature and rebuilt part of the basesystem (i.e. library dependencies: libterminfo, libkvm, libutil) with dedicated sanitization flags. [Read More] [0 comments]

 

Forking fixes in the context of debuggers


May 02, 2018 posted by Kamil Rytarowski

For the past month I've been mostly working on improving the kernel code in the ptrace(2) API. Additionally, I've prepared support for reading NetBSD/aarch64 core(5) files. [Read More] [0 comments]

 

Struggling to fix a bohrbug in X86 Debug Registers


April 02, 2018 posted by Kamil Rytarowski

I've spent a month on fixes and debugging issues around the tracing facilities in the kernel.[Read More] [0 comments]

 

LLDB restoration and return to ptrace(2)


March 01, 2018 posted by Kamil Rytarowski

I've managed to unbreak the LLDB debugger as much as possible with the current kernel and hit problems with ptrace(2) that are causing issues with further work on proper NetBSD support. Meanwhile, I've upstreamed all the planned NetBSD patches to sanitizers and helped other BSDs to gain better or initial support.[Read More] [0 comments]

 

The LLVM Sanitizers stage accomplished


February 01, 2018 posted by Kamil Rytarowski

I've managed to get the Memory Sanitizer to work for the elementary base system utilities, like ps(1), awk(1) and ksh(1). This means that the toolchain is ready for tests and improvements. I've iterated over the base system utilities and I looked for bugs, both in programs and in sanitizers. The number of detected bugs in the userland programs was low, there merely was one reading of an uninitialized variable in ps(1).[Read More] [0 comments]

 

The LLVM Memory Sanitizer support work in progress


January 03, 2018 posted by Kamil Rytarowski

In the past 31 days, I've managed to get the core functionality of MSan to work. This is an uninitialized memory usage detector. MSan is a special sanitizer because it requires knowledge of every entry to the basesystem library and every entry to the kernel through public interfaces. This is mandatory in order to mark memory regions as initialized.[Read More] [0 comments]

 

The LLVM Thread Sanitizer has been ported to NetBSD


November 30, 2017 posted by Kamil Rytarowski

During the past month I've finished my work on TSan for NetBSD/amd64. There are still few minor issues, although the Sanitizer is already suitable for real applications and is stable. I was able to build real applications like LLDB against TSan and get it to work to find real threading problems.

The process of stabilization and fixing TSan was challenging as there are intermixed types of issues that resulted in one big random breakage bug that is difficult to analyze. Software debuggers need more work with threaded programs, so this was like a chicken-egg problem, to debug debugging utilities.[Read More] [0 comments]

 

One year checkpoint and Thread Sanitizer update


November 01, 2017 posted by Kamil Rytarowski

The past year has been started with bugfixes and the development of regression tests for ptrace(2) and related kernel features, as well as the continuation of bringing LLDB support and LLVM sanitizers (ASan + UBsan and partial TSan + Msan) to NetBSD.
My plan for the next year is to finish implementing TSan and MSan support, followed by a long run of bug fixes for LLDB, ptrace(2), and other related kernel subsystems[Read More] [1 comment]

 

2017 NetBSD Foundation Officers


October 04, 2017 posted by William J. Coldwell

By vote of The NetBSD Foundation Board of Directors, the officers for the 2017 term are:

President: William J. Coldwell <billc>
Vice President: Jeremy C. Reed <reed>
Secretary: Christos Zoulas <christos>
Treasurer: Christos Zoulas <christos>
Assistant Secretary: Thomas Klausner <wiz>
Assistant Treasurer: Taylor R. Campbell <riastradh>
[0 comments]

 

EuroBSDcon-2017 Paris


October 02, 2017 posted by Kamil Rytarowski

This year the annual EuroBSDcon event took place in Paris (September 21st-24th). There were BSD summits, tutorials and talks, including NetBSD & pkgsrc ones.[Read More] [0 comments]

 

The new TNF Board of Directors are installed and patched for 2017.


September 27, 2017 posted by William J. Coldwell

The slate of nominees was voted for and accepted by the members of the foundation. We'd like to our team of nomcom, voting coordinator, and voting validator for putting together the slate and managing the election process.

We welcome Pierre Pronchery and Makoto Fujiwara to the 2017 Board of Directors. We look forward to working with you!

We appreciate all of the wonderful work that S.P.Zeidler and Erik Berls have done on the board during their time as directors, and are grateful for their excellent service to the foundation.

Thank you to all members participating by nominating candidates and voting on the slate.



Respectfully submitted for The NetBSD Foundation,
William J. Coldwell
President/Chairperson
[0 comments]

 

NetBSD buildbot in the binutils-gdb project


September 14, 2017 posted by Kamil Rytarowski

The NetBSD Foundation supports projects that strive to ship the best possible support in developer oriented software. This is not exclusive to LLVM, but also includes the more traditional GNU toolchain.[Read More] [0 comments]