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llvm / scudo / 8f2b20bd35697c3651fe90e43cd6092606539b11
commit8f2b20bd35697c3651fe90e43cd6092606539b11[log] [tgz]
authorEvgenii Stepanov <eugeni.stepanov@gmail.com>Mon Jan 29 14:22:24 2024 -0800
committerCopybara-Service <copybara-worker@google.com>Mon Jan 29 14:32:14 2024 -0800
tree0263564c8afebbf7b696e857848e424289b42506
parentba1f5293b03e49471bf139e85a4a2697dafa9637 [diff]
[scudo] Add StackDepot lock to enable/disable. (#79670)

Scudo grabs all allocator locks in a pthread_atfork before the fork, and releases them after. This allows malloc to be used in a fork child of a multithreaded process, which is expressly forbidden by the standard, but very widely used. For example, Android's init uses std::string after fork when spawning services in android::init::EnterNamespaces and other places.

Any lock that is necessary to serve an allocator call must be handled this way. Otherwise there is a possibility that the lock is held during the call to fork, which results in it being held forever in the child process, and the next operation that needs it deadlocks.

GitOrigin-RevId: c82f3caf5683a443692162d9fbebc31019af7ce8
2 files changed
tree: 0263564c8afebbf7b696e857848e424289b42506
  1. benchmarks/
  2. fuzz/
  3. include/
  4. tests/
  5. tools/
  6. allocator_common.h
  7. allocator_config.h
  8. atomic_helpers.h
  9. bytemap.h
  10. checksum.cpp
  11. checksum.h
  12. chunk.h
  13. combined.h
  14. common.cpp
  15. common.h
  16. condition_variable.h
  17. condition_variable_base.h
  18. condition_variable_linux.cpp
  19. condition_variable_linux.h
  20. crc32_hw.cpp
  21. flags.cpp
  22. flags.h
  23. flags.inc
  24. flags_parser.cpp
  25. flags_parser.h
  26. fuchsia.cpp
  27. fuchsia.h
  28. internal_defs.h
  29. LICENSE.TXT
  30. linux.cpp
  31. linux.h
  32. list.h
  33. local_cache.h
  34. mem_map.cpp
  35. mem_map.h
  36. mem_map_base.h
  37. mem_map_fuchsia.cpp
  38. mem_map_fuchsia.h
  39. mem_map_linux.cpp
  40. mem_map_linux.h
  41. memtag.h
  42. mutex.h
  43. options.h
  44. platform.h
  45. primary32.h
  46. primary64.h
  47. quarantine.h
  48. release.cpp
  49. release.h
  50. report.cpp
  51. report.h
  52. report_linux.cpp
  53. report_linux.h
  54. secondary.h
  55. size_class_map.h
  56. stack_depot.h
  57. stats.h
  58. string_utils.cpp
  59. string_utils.h
  60. thread_annotations.h
  61. timing.cpp
  62. timing.h
  63. trusty.cpp
  64. trusty.h
  65. tsd.h
  66. tsd_exclusive.h
  67. tsd_shared.h
  68. vector.h
  69. wrappers_c.cpp
  70. wrappers_c.h
  71. wrappers_c.inc
  72. wrappers_c_bionic.cpp
  73. wrappers_c_checks.h
  74. wrappers_cpp.cpp