Google Git
Sign in
llvm / scudo / bf9b3fead310788099c376ed1c275c9338363419
commitbf9b3fead310788099c376ed1c275c9338363419[log] [tgz]
authorChiaHungDuan <chiahungduan@google.com>Thu Sep 28 13:05:35 2023 -0700
committerCopybara-Service <copybara-worker@google.com>Thu Sep 28 13:11:18 2023 -0700
treef9b5d1f687f03e5437f67bc8303468f72a3df1cf
parent869bb92aaaeb920a1495aeabeac1103f003114f4 [diff]
[scudo] Update header without read-modify-write operation (#66955)

We used to update the deallocated block with
atomic_compare_exchange_strong to ensure the concurrent double-free will
be detected. However, this operation incurs huge performance overhead
which takes over 50% execution time in deallocate(). Given that we
already have the checksum to guard the most double-free cases and other
block verifications in the primary allocator, use atomic-store instead.

GitOrigin-RevId: 54ddd0762bd0dac31c9e2732bf807cea1785f091
6 files changed
tree: f9b5d1f687f03e5437f67bc8303468f72a3df1cf
  1. benchmarks/
  2. fuzz/
  3. include/
  4. tests/
  5. tools/
  6. allocator_config.h
  7. atomic_helpers.h
  8. bytemap.h
  9. checksum.cpp
  10. checksum.h
  11. chunk.h
  12. combined.h
  13. common.cpp
  14. common.h
  15. crc32_hw.cpp
  16. flags.cpp
  17. flags.h
  18. flags.inc
  19. flags_parser.cpp
  20. flags_parser.h
  21. fuchsia.cpp
  22. fuchsia.h
  23. internal_defs.h
  24. LICENSE.TXT
  25. linux.cpp
  26. linux.h
  27. list.h
  28. local_cache.h
  29. mem_map.cpp
  30. mem_map.h
  31. mem_map_base.h
  32. mem_map_fuchsia.cpp
  33. mem_map_fuchsia.h
  34. mem_map_linux.cpp
  35. mem_map_linux.h
  36. memtag.h
  37. mutex.h
  38. options.h
  39. platform.h
  40. primary32.h
  41. primary64.h
  42. quarantine.h
  43. release.cpp
  44. release.h
  45. report.cpp
  46. report.h
  47. secondary.h
  48. size_class_map.h
  49. stack_depot.h
  50. stats.h
  51. string_utils.cpp
  52. string_utils.h
  53. thread_annotations.h
  54. timing.cpp
  55. timing.h
  56. trusty.cpp
  57. trusty.h
  58. tsd.h
  59. tsd_exclusive.h
  60. tsd_shared.h
  61. vector.h
  62. wrappers_c.cpp
  63. wrappers_c.h
  64. wrappers_c.inc
  65. wrappers_c_bionic.cpp
  66. wrappers_c_checks.h
  67. wrappers_cpp.cpp