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README: merge existing Google Sites page to markdown

I didn't convert all of the syscall-filtering subpage because much of
the content already exists in Chromium OS's sandboxing document and our
minijail0.5 man page.

The navbar.md file provides consistent framing when viewing md files.

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  6. HACKING.md
  7. LICENSE
  8. MODULE_LICENSE_BSD
  9. Makefile
  10. NOTICE
  11. OWNERS
  12. PRESUBMIT.cfg
  13. PREUPLOAD.cfg
  14. README.md
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  45. parse_seccomp_policy.cc
  46. platform2_preinstall.sh
  47. scoped_minijail.h
  48. signal_handler.c
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  50. syscall_filter.c
  51. syscall_filter.h
  52. syscall_filter_unittest.cc
  53. syscall_filter_unittest_macros.h
  54. syscall_wrapper.c
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README.md

Minijail

The Minijail homepage & main repo is https://android.googlesource.com/platform/external/minijail/.

There might be other copies floating around, but this is the official one!

What is it?

Minijail is a sandboxing and containment tool used in Chrome OS, and Android. It provides an executable that can be used to launch and sandbox other programs, and a library that can be used by code to sandbox itself.

Getting The Code

You're one git clone away from happiness.

$ git clone https://android.googlesource.com/platform/external/minijail
$ cd minijail

Releases are tagged as linux-vXX: https://android.googlesource.com/platform/external/minijail/+refs

Building

See the HACKING.md document for more details.

Release Process

See the RELEASE.md document for more details.

Contact

We've got a couple of contact points.

Talks and Presentations

The following talk serves as a good introduction to Minijail and how it can be used.

Video, slides.

Example Usage

The Chromium OS project has a comprehensive sandboxing document that is largely based on Minijail.

After you play with the simple examples below, you should check that out.

Change root to any user

# id
uid=0(root) gid=0(root) groups=0(root),128(pkcs11)
# minijail0 -u jorgelo -g 5000 /usr/bin/id
uid=72178(jorgelo) gid=5000(eng) groups=5000(eng)

Drop root while keeping some capabilities

# minijail0 -u jorgelo -c 3000 -- /bin/cat /proc/self/status
Name: cat
...
CapInh: 0000000000003000
CapPrm: 0000000000003000
CapEff: 0000000000003000
CapBnd: 0000000000003000