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android / platform / external / minijail / 31adc6c9a4dbfd049a8648d1e09e2886e686034a
commit31adc6c9a4dbfd049a8648d1e09e2886e686034a[log] [tgz]
authorAnand K Mistry <[email protected]>Thu Nov 26 11:39:46 2020 +1100
committerJorge Lucangeli Obes <[email protected]>Wed Dec 09 09:52:30 2020 -0500
treec3fe06dd2cb40abb120f81dceb9ed478964cc7c3
parent0a5fe470e9f052f2082653da995080ded391683d [diff]
minijail0: Add flag to allow speculative execution on seccomp enabled processes

By default, speculative execution is disabled on seccomp processes to
mitigate against speculative execution based attacks. However, this
comes at a significant performance penalty on some CPUs. By adding a
flag to allow speculative execution, we can tune the
performance/security tradeoff for certain processes.

Bug: 170247420
Test: Deploy to grunt and add flag to cras. See reduced CPU usage of
      switch_mm_irqs_off() kernel function during meet call.

Change-Id: Id162a0ab9d8084b8023fa76e93ce91613e48f115
4 files changed
tree: c3fe06dd2cb40abb120f81dceb9ed478964cc7c3
  1. .github/
  2. examples/
  3. linux-x86/
  4. rust/
  5. test/
  6. tools/
  7. .clang-format
  8. .gitignore
  9. Android.bp
  10. arch.h
  11. bpf.c
  12. bpf.h
  13. CleanSpec.mk
  14. common.mk
  15. CPPLINT.cfg
  16. dump_constants.cc
  17. elfparse.c
  18. elfparse.h
  19. gen_constants-inl.h
  20. gen_constants.c
  21. gen_constants.sh
  22. gen_syscalls-inl.h
  23. gen_syscalls.c
  24. gen_syscalls.sh
  25. get_googletest.sh
  26. HACKING.md
  27. libconstants.h
  28. libminijail-private.h
  29. libminijail.c
  30. libminijail.h
  31. libminijail.pc.in
  32. libminijail_unittest.cc
  33. libminijailpreload.c
  34. libsyscalls.h
  35. LICENSE
  36. Makefile
  37. METADATA
  38. minijail0.1
  39. minijail0.5
  40. minijail0.c
  41. minijail0.sh
  42. minijail0_cli.c
  43. minijail0_cli.h
  44. minijail0_cli_unittest.cc
  45. MODULE_LICENSE_BSD
  46. navbar.md
  47. NOTICE
  48. OWNERS
  49. OWNERS.rust
  50. parse_seccomp_policy.cc
  51. platform2_preinstall.sh
  52. PRESUBMIT.cfg
  53. PREUPLOAD.cfg
  54. README.md
  55. RELEASE.md
  56. scoped_minijail.h
  57. setup.py
  58. signal_handler.c
  59. signal_handler.h
  60. syscall_filter.c
  61. syscall_filter.h
  62. syscall_filter_unittest.cc
  63. syscall_filter_unittest_macros.h
  64. syscall_wrapper.c
  65. syscall_wrapper.h
  66. system.c
  67. system.h
  68. system_unittest.cc
  69. TEST_MAPPING
  70. testrunner.cc
  71. util.c
  72. util.h
  73. util_unittest.cc
README.md

Minijail

The Minijail homepage is https://google.github.io/minijail/.

The main source 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.

Additional tools

See the tools/README.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