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chromium / chromiumos / platform / minijail / 238e67afe3e1f7a6c3de2d5531a5ec2844eb7083
commit238e67afe3e1f7a6c3de2d5531a5ec2844eb7083[log] [tgz]
authorBen Scarlato <akhna@google.com>Thu Apr 27 19:25:00 2023
committerChromeos LUCI <chromeos-scoped@luci-project-accounts.iam.gserviceaccount.com>Fri Apr 28 17:32:42 2023
tree85b181ce0de688ba42a637a00d917f73387d2e8e
parentb631ad7060eb3d781caa47e2d7ef098d249b60c5 [diff]
minijail: remove LANDLOCK_ACCESS_FS_REFER logs

These can be removed now, because LANDLOCK_ACCESS_FS_REFER is
now backported to all chromeOS kernels that support Landlock.

BUG=b:271154170
TEST=security.Minijail*

Change-Id: I74d2b2253375b432eef941bdb562030cafa148ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minijail/+/4481606
Auto-Submit: Ben Scarlato <akhna@google.com>
Tested-by: Ben Scarlato <akhna@google.com>
Reviewed-by: Allen Webb <allenwebb@google.com>
Commit-Queue: Ben Scarlato <akhna@google.com>
1 file changed
tree: 85b181ce0de688ba42a637a00d917f73387d2e8e
  1. .github/
  2. examples/
  3. linux-x86/
  4. policies/
  5. rust/
  6. test/
  7. tools/
  8. .clang-format
  9. .gitignore
  10. Android.bp
  11. arch.h
  12. bpf.c
  13. bpf.h
  14. CleanSpec.mk
  15. common.mk
  16. config_parser.c
  17. config_parser.h
  18. config_parser_unittest.cc
  19. CPPLINT.cfg
  20. DIR_METADATA
  21. dump_constants.cc
  22. elfparse.c
  23. elfparse.h
  24. gen_constants-inl.h
  25. gen_constants.c
  26. gen_constants.sh
  27. gen_syscalls-inl.h
  28. gen_syscalls.c
  29. gen_syscalls.sh
  30. get_googletest.sh
  31. HACKING.md
  32. landlock.h
  33. landlock_util.c
  34. landlock_util.h
  35. libconstants.h
  36. libminijail-private.h
  37. libminijail.c
  38. libminijail.h
  39. libminijail.pc.in
  40. libminijail_unittest.cc
  41. libminijailpreload.c
  42. libsyscalls.h
  43. LICENSE
  44. Makefile
  45. METADATA
  46. minijail0.1
  47. minijail0.5
  48. minijail0.c
  49. minijail0.sh
  50. minijail0_cli.c
  51. minijail0_cli.h
  52. minijail0_cli_unittest.cc
  53. MODULE_LICENSE_BSD
  54. navbar.md
  55. NOTICE
  56. OWNERS
  57. OWNERS_GENERAL
  58. parse_seccomp_policy.cc
  59. platform2_preinstall.sh
  60. PRESUBMIT.cfg
  61. PREUPLOAD.cfg
  62. README.md
  63. RELEASE.md
  64. scoped_minijail.h
  65. setup.py
  66. signal_handler.c
  67. signal_handler.h
  68. syscall_filter.c
  69. syscall_filter.h
  70. syscall_filter_unittest.cc
  71. syscall_filter_unittest_macros.h
  72. syscall_wrapper.c
  73. syscall_wrapper.h
  74. system.c
  75. system.h
  76. system_unittest.cc
  77. TEST_MAPPING
  78. test_util.cc
  79. test_util.h
  80. testrunner.cc
  81. unittest_util.h
  82. util.c
  83. util.h
  84. util_unittest.cc
README.md

Minijail

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

The main source repo is https://chromium.googlesource.com/chromiumos/platform/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 ChromeOS 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://chromium.googlesource.com/chromiumos/platform/minijail
$ cd minijail

Releases are tagged as linux-vXX: https://chromium.googlesource.com/chromiumos/platform/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 ChromiumOS 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

Historical notes

Q. “Why is it called minijail0?”

A. It is minijail0 because it was a rewrite of an earlier program named minijail, which was considerably less mini, and in particular had a dependency on libchrome (the ChromeOS packaged version of Chromium's //base). We needed a new name to not collide with the deprecated one.

We didn‘t want to call it minijail2 or something that would make people start using it before we were ready, and it was also concretely less since it dropped libbase, etc. Technically, we needed to be able to fork/preload with minimal extra syscall noise which was too hard with libbase at the time (onexit handlers, etc that called syscalls we didn’t want to allow). Also, Elly made a strong case that C would be the right choice for this for linking and ease of controlled surprise system call use.

https://crrev.com/c/4585/ added the original implementation.

Source: Conversations with original authors, ellyjones@ and wad@.