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Ben Wiederhake 28e1da344d Kernel: Demonstrate race condition in clock_nanosleep 
This adds a test for the race condition in clock_nanosleep.
The crux is that clock_nanosleep verifies that the output buffer
is writable *before* sleeping, and writes to it *after* sleeping.
In the meantime, a concurrent thread can make the output buffer
unwritable, e.g. by deallocating it.

This testcase is needlessly complex because pthread_kill is
not implemented yet.  I tried to keep it as simple as possible.

Here is the relevant part of dmesg:
[nanosleep-race-outbuf-munmap(22:22)]: Unblock nanosleep-race-outbuf-munmap(20:20) due to signal
nanosleep-race-outbuf-munmap(20:20) Unrecoverable page fault, write to address 0x02130016
CRASH: Page Fault. Process: nanosleep-race-outbuf-munmap(20)
[nanosleep-race-outbuf-munmap(20:20)]: 0xc01160ff  memcpy +44
[nanosleep-race-outbuf-munmap(20:20)]: 0xc014de64  Kernel::Process::crash(int, unsigned int) +782
[nanosleep-race-outbuf-munmap(20:20)]: 0xc01191b5  illegal_instruction_handler +0
[nanosleep-race-outbuf-munmap(20:20)]: 0xc011965b  page_fault_handler +649
[nanosleep-race-outbuf-munmap(20:20)]: 0xc0117233  page_fault_asm_entry +22
[nanosleep-race-outbuf-munmap(20:20)]: 0xc011616b  copy_to_user +102
[nanosleep-race-outbuf-munmap(20:20)]: 0xc015911f  Kernel::Process::sys(Kernel::Syscall::SC_clock_nanosleep_params const*) +457
[nanosleep-race-outbuf-munmap(20:20)]: 0xc015daad  syscall_handler +1130
[nanosleep-race-outbuf-munmap(20:20)]: 0xc015d597  syscall_asm_entry +29
[nanosleep-race-outbuf-munmap(20:20)]: 0x08048437  main +146
[nanosleep-race-outbuf-munmap(20:20)]: 0x08048573  _start +94

Most importantly, note that it crashes *inside*
Kernel::Process::sys.
Instead, the correct behavior is to return -EFAULT.
2020-03-03 20:13:32 +01:00
.github Meta: Add GitHub Sponsors to funding options 2019-11-02 23:32:34 +01:00
AK AK: Make quick_sort() a little more ergonomic 2020-03-03 16:02:58 +01:00
Applications LibGUI: Remove Button& parameter from Button::on_click hook 2020-03-03 17:02:38 +01:00
Base Base: Add anon user to the phys group 2020-03-03 16:39:06 +01:00
Demos LibGUI: Remove Button& parameter from Button::on_click hook 2020-03-03 17:02:38 +01:00
DevTools LibGUI: Remove Button& parameter from Button::on_click hook 2020-03-03 17:02:38 +01:00
Documentation Build: Use ccache if it's available (#1315) 2020-02-27 11:44:29 +01:00
Games LibGUI: Remove Button& parameter from Button::on_click hook 2020-03-03 17:02:38 +01:00
Kernel AK: Make quick_sort() a little more ergonomic 2020-03-03 16:02:58 +01:00
Libraries LibGUI: Remove Button& parameter from Button::on_click hook 2020-03-03 17:02:38 +01:00
MenuApplets Build: Only look at SUBDIRS with Makefiles 2020-02-25 19:56:48 +01:00
Meta Meta: Integrate Shellcheck into Travis 2020-02-10 10:46:25 +01:00
Ports Ports: Update the C-ray renderer port 2020-02-27 09:53:36 +01:00
Servers LibGUI: Remove Button& parameter from Button::on_click hook 2020-03-03 17:02:38 +01:00
Shell AK: Make quick_sort() a little more ergonomic 2020-03-03 16:02:58 +01:00
Tests Kernel: Demonstrate race condition in clock_nanosleep 2020-03-03 20:13:32 +01:00
Toolchain Toolchain: Add x86_64 cross compiler build script 2020-02-27 13:00:03 +01:00
Userland AK: Make quick_sort() a little more ergonomic 2020-03-03 16:02:58 +01:00
.clang-format Meta: Tweak .clang-format to not wrap braces after enums. 2019-06-07 17:13:23 +02:00
.gitignore Demos: Add a dynamic linking demo to show off dlfcn methods 2020-01-01 17:48:41 +01:00
.travis.yml CI: Update .travis.yml (#1334) 2020-03-02 06:26:34 +01:00
CODE_OF_CONDUCT.md Meta: Move code of conduct (lol) to a separate file 2019-10-23 10:05:06 +02:00
CONTRIBUTING.md Meta: Reference CodingStyle doc in CONTRIBUTING.md 2020-01-08 19:41:20 +01:00
INSTALL.md Meta: Update link to build instructions in INSTALL.md 2020-01-01 17:33:32 +01:00
LICENSE Meta: Add license header to source files 2020-01-18 09:45:54 +01:00
Makefile Build: Use ccache if it's available (#1315) 2020-02-27 11:44:29 +01:00
Makefile.common Build: Build with -std=c++2a 2020-02-19 12:03:11 +01:00
Makefile.subdir Build: wrap make invocations with flock(1) 2019-12-28 21:09:33 +01:00
ReadMe.md Meta: Oops, remove duplicate mention of desktop games 2020-02-06 15:54:24 +01:00

ReadMe.md

SerenityOS

Graphical Unix-like operating system for x86 computers.

Travis CI status

About

SerenityOS is a love letter to '90s user interfaces with a custom Unix-like core. It flatters with sincerity by stealing beautiful ideas from various other systems.

Roughly speaking, the goal is a marriage between the aesthetic of late-1990s productivity software and the power-user accessibility of late-2000s *nix. This is a system by us, for us, based on the things we like.

I (Andreas) regularly post raw hacking sessions and demos on my YouTube channel.

Sometimes I write about the system on my github.io blog.

I'm also on Patreon and GitHub Sponsors if you would like to show some support that way.

Screenshot

Screenshot as of 1133aca

Kernel features

  • x86 (32-bit) kernel with pre-emptive multi-threading
  • Hardware protections (SMEP, SMAP, UMIP, NX, WP, TSD, ...)
  • IPv4 stack with ARP, TCP, UDP and ICMP protocols
  • ext2 filesystem
  • POSIX signals
  • Purgeable memory
  • /proc filesystem
  • Pseudoterminals (with /dev/pts filesystem)
  • Filesystem notifications
  • CPU and memory profiling
  • SoundBlaster 16 driver
  • VMWare/QEMU mouse integration

System services

  • Launch/session daemon (SystemServer)
  • Compositing window server (WindowServer)
  • DNS client (LookupServer)
  • Software-mixing sound daemon (AudioServer)

Libraries

  • C++ templates and containers (AK)
  • Event loop and utilities (LibCore)
  • 2D graphics library (LibGfx)
  • GUI toolkit (LibGUI)
  • Cross-process communication library (LibIPC)
  • HTML/CSS engine (LibHTML)
  • Markdown (LibMarkdown)
  • Audio (LibAudio)
  • PCI database (LibPCIDB)
  • Terminal emulation (LibVT)
  • Network protocols (HTTP) (LibProtocol)

Userland features

  • Unix-like libc and userland
  • Shell with pipes and I/O redirection
  • On-line help system (both terminal and GUI variants)
  • Web browser (Browser)
  • C++ IDE (HackStudio)
  • IRC client
  • Desktop synthesizer (Piano)
  • Various desktop apps & games
  • Color themes

How do I build and run this?

See the SerenityOS build instructions

Wanna chat?

Come hang out with us in #serenityos on the Freenode IRC network.

Author

Contributors

(And many more!) Feel free to append yourself here if you've made some sweet contributions. :)

License

SerenityOS is licensed under a 2-clause BSD license.