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Towards backtracing through signal trampolines and fresh libc++
Upstream describes LLDB as a next generation, high-performance debugger. It is built on top of LLVM/Clang toolchain, and features great integration with it. At the moment, it primarily supports debugging C, C++ and ObjC code, and there is interest in extending it to more languages.
In February 2019, I have started working on LLDB, as contracted by the NetBSD Foundation. So far I've been working on reenabling continuous integration, squashing bugs, improving NetBSD core file support, extending NetBSD's ptrace interface to cover more register types and fix compat32 issues, fixing watchpoint and threading support, porting to i386.
During the last month, I've finally managed to create proper reproducers (and tests) for the remaining concurrent signal delivery problems. I have started working on backtracing through signal trampolines, and prepared a libc++ update.
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NetBSD 9.0 available!
Six months after the start of the release engineering process, NetBSD 9.0 is now available.
The NetBSD 9.0 release comes with many new features and lots of improvements over the NetBSD 8.1 release...
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Fundraising 2020
Fundraising drive 2020: trying to raise $50,000 for more funded development projects to fix itching issues.
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Approaching the end of work on ptrace(2)
This is one of my last reports on enhancements on
ptrace(2) and the surrounding code.
This month I complete a set of older pending tasks.[Read More]
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LLDB now works on i386
Upstream describes LLDB as a next generation, high-performance debugger. It is built on top of LLVM/Clang toolchain, and features great integration with it. At the moment, it primarily supports debugging C, C++ and ObjC code, and there is interest in extending it to more languages.
In February 2019, I have started working on LLDB, as contracted by the NetBSD Foundation. So far I've been working on reenabling continuous integration, squashing bugs, improving NetBSD core file support, extending NetBSD's ptrace interface to cover more register types and fix compat32 issues, fixing watchpoint and threading support.
The original NetBSD port of LLDB was focused on amd64 only. In January, I have extended it to support i386 executables. This includes both 32-bit builds of LLDB (running natively on i386 kernel or via compat32) and debugging 32-bit programs from 64-bit LLDB.
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Second (final) release candidate for NetBSD 9.0 available!
Six months after the start of the release engineering process for 9.0, the second (and most likely final) release candidate is now available.
The NetBSD 9.0 release comes with many new features and lots of improvements over the NetBSD 8.1 release...
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Improving the ptrace(2) API and preparing for LLVM-10.0
This month I have improved the NetBSD
ptrace(2) API, removing one legacy
interface with a few flaws and replacing it with two new calls with new
features, and removing technical debt.
As LLVM 10.0 is branching now soon (Jan 15th 2020), I worked on proper support of the LLVM features for NetBSD 9.0 (today RC1) and NetBSD HEAD (future 10.0).[Read More] [0 comments]
GSoC 2019 Final Report: Incorporating the memory-hard Argon2 hashing scheme into NetBSD
Introduction
We successfully incorporated the Argon2 reference implementation into NetBSD/amd64 for our 2019 Google Summer of Coding project. We introduced our project here and provided some hints on how to select parameters here. For our final report, we will provide an overview of what changes were made to complete the project.
Incorporating the Argon2 Reference Implementation
The Argon2 reference implementation, available here, is available under both the Creative Commons CC0 1.0 and the Apache Public License 2.0. To import the reference implementation into src/external, we chose to use the Apache 2.0 license for this project.During our initial phase 1, we focused on building the libargon2 library and integrating the functionality into the existing password management framework via libcrypt. Toward this end, we imported the reference implementation and created the "glue" to incorporate the changes into /usr/src/external/apache. The reference implementation is found in
m2$ ls /usr/src/external/apache2/argon2 Makefile dist lib usr.bin
_MKVARS.yes= \
...
MKARGON2 \
...
.if (defined(MKARGON2) && ${MKARGON2} != "no")
SUBDIR+= argon2
.endif
/usr/bin/argon2 /usr/lib/libargon2.a /usr/lib/libargon2.so /usr/lib/libargon2.so.1 /usr/lib/libargon2.so.1.0
.if (defined(MKARGON2) && ${MKARGON2} != "no")
HAVE_ARGON2=1
.endif
.if defined(HAVE_ARGON2) SRCS+= crypt-argon2.c CFLAGS+= -DHAVE_ARGON2 -I../../external/apache2/argon2/dist/phc-winner -argon2/include/ LDADD+= -largon2 .endif
Having completed the backend support, we pull Argon2 into userland tools, such as pwhash(1), in the same way as above
.if ( defined(MKARGON2) && ${MKARGON2} != "no" )
CPPFLAGS+= -DHAVE_ARGON2
.endif
m2# pwhash -A argon2id password $argon2id$v=19$m=4096,t=3,p=1$.SJJCiU575MDnA8s$+pjT4JsF2eLNQuLPEyhRA5LCFG QWAKsksIPl5ewTWNY
m1# grep -A1 testuser /etc/passwd.conf
testuser:
localcipher = argon2i,t=6,m=4096,p=1
m1# passwd testuser Changing password for testuser. New Password: Retype New Password: m1# grep testuser /etc/master.passwd testuser:$argon2i$v=19$m=4096,t=6,p=1$PDd65qr6JU0Pfnpr$8YOMYcwINuKHoxIV8Q0FJHG+ RP82xtmAuGep26brilU:1001:100::0:0::/home/testuser:/sbin/nologin
Testing
The argon2(1) binary allows us to easily validate parameters and encoding. This is most useful during performance testing, see here. With argon2(1), we can specify our parameterized values and evaluate both the resulting encoding and timing.m2# echo -n password|argon2 somesalt -id -p 3 -m 8 Type: Argon2id Iterations: 3 Memory: 256 KiB Parallelism: 3 Hash: 97f773f68715d27272490d3d2e74a2a9b06a5bca759b71eab7c02be8a453bfb9 Encoded: $argon2id$v=19$m=256,t=3,p=3$c29tZXNhbHQ$l/dz9ocV0nJySQ09LnSiqb BqW8p1m3Hqt8Ar6KRTv7k 0.000 seconds Verification ok
/usr/src/tests/usr.bin/argon2 tp: t_argon2_v10_hash tp: t_argon2_v10_verify tp: t_argon2_v13_hash tp: t_argon2_v13_verify cd /usr/src/tests/usr.bin/argon2 atf-run info: atf.version, Automated Testing Framework 0.20 (atf-0.20) info: tests.root, /usr/src/tests/usr.bin/argon2 .. tc-so:Executing command [ /bin/sh -c echo -n password | \ argon2 somesalt -v 13 -t 2 -m 8 -p 1 -r ] tc-end: 1567497383.571791, argon2_v13_t2_m8_p1, passed ...