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GSoC 2018 Reports: Integrate libFuzze...
Prepared by Yang Zheng (tomsun.0.7 AT Gmail DOT com) as part of GSoC 2018
During the Google
Summer of Code 2018, I\'m working on the project
of integrating
libFuzzer for the userland
applications. The libFuzzer is a fuzzing engine
based on the coverage information provided by
the SanitizerCoverage
in LLVM. It can repeatedly ge [...]
Coverage of signal routines in the ke...
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 full-time focus on NetBSD work,
actively help three Google Summer of Code students.
Not every question (Read more. [...]
Forking fixes in the context of debug...
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.
LLDB
I\'ve rebased my old patches for handling NetBSD core(5) files to recent LLDB from HEAD (7.0svn).
I had to implement the support for aarch64, as requested by Joer [...]
Struggling to fix a bohrbug in X86 De...
I\'ve spent a month on fixes and debugging issues around the tracing facilities in the kernel.
Distribution cleanup
As planned in the previous month, I\'ve performed cleanup in the distribution:
Removal of unneeded PT_SET_SIGMASK and PT_GET_SIGMASK, followed by pullup to NetBSD-8.
regnsub(3) and regasub(3) API change has been abandoned as [...]
LLDB restoration and return to ptrace...
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.
LLDB
Since the last time [...]
The LLVM Sanitizers stage accomplishe...
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 basesystem utilities and I looked for bugs, both in programs and in sanitizers.
The number of detected bugs in the userland progra [...]
The LLVM Memory Sanitizer support wor...
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 initi [...]
The LLVM Memory Sanitizer support wor...
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 initi [...]
The LLVM Thread Sanitizer has been po...
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 [...]
The LLVM Thread Sanitizer has been po...
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 [...]
One year checkpoint and Thread Saniti...
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 lon [...]
One year checkpoint and Thread Saniti...
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 lon [...]
EuroBSDcon-2017 Paris
This year the annual EuroBSDcon event took place in Paris (September 21st-24th).
There were BSD summits, tutorials and talks, including NetBSD & pkgsrc ones.
Tutorials
I came to Paris on Wednesday in order to participate in tutorials:
Thursday - DTrace for Developers: no more printfs - by George Neville-Neil
Friday - How to untangle yo [...]
EuroBSDcon-2017 Paris
This year the annual EuroBSDcon event took place in Paris (September 21st-24th).
There were BSD summits, tutorials and talks, including NetBSD & pkgsrc ones.
Tutorials
I came to Paris on Wednesday in order to participate in tutorials:
Thursday - DTrace for Developers: no more printfs - by George Neville-Neil
Friday - How to untangle yo [...]
NetBSD buildbot in the binutils-gdb p...
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.
Traditionally, developers in distributions like NetBSD merge 3rd party sources upstream once in a while with major release bumps, like switc [...]
NetBSD buildbot in the binutils-gdb p...
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.
Traditionally, developers in distributions like NetBSD merge 3rd party sources upstream once in a while with major release bumps, like switc [...]
Mercurial mirror on Bitbucket
Joerg Sonnenberger has announced a new set of mirrored repositories.
You can find Mercurial versions of src, pkgsrc and xsrc under
https://bitbucket.org/netbsd/src
https://bitbucket.org/netbsd/pkgsrc
and
https://bitbucket.org/netbsd/xsrc
The same rules as for the fossil and github repositories apply, i.e.
there may be occasional glitch [...]
Mercurial mirror on Bitbucket
Joerg Sonnenberger has announced a new set of mirrored repositories.
You can find Mercurial versions of src, pkgsrc and xsrc under
https://bitbucket.org/netbsd/src
https://bitbucket.org/netbsd/pkgsrc
and
https://bitbucket.org/netbsd/xsrc
The same rules as for the fossil and github repositories apply, i.e.
there may be occasional glitch [...]
LLVM libFuzzer and SafeStack ported t...
This month I\'ve finally finished upstreaming NetBSD support in ASan and UBsan.
For better coverage of the sanitizers and on user request I\'ve ported libFuzzer and SafeStack.
There are mutual dependencies between the compiler-rt features.
NetBSD after sorting out msan and tsan shall get all the remaining ones enabled.
This is open topic afte [...]
LLVM libFuzzer and SafeStack ported t...
This month I\'ve finally finished upstreaming NetBSD support in ASan and UBsan.
For better coverage of the sanitizers and on user request I\'ve ported libFuzzer and SafeStack.
There are mutual dependencies between the compiler-rt features.
NetBSD after sorting out msan and tsan shall get all the remaining ones enabled.
This is open topic afte [...]
