[v4,bpf-next,0/2] introduce bpf_find_vma

Message

Song Liu Nov. 4, 2021, 9:31 p.m. UTC

Changes v3 => v4:
1. Move mmap_unlock_work to task_iter.c to fix build for .config without
   !CONFIG_PERF_EVENTS. (kernel test robot)

Changes v2 => v3:
1. Avoid using x86 only function in selftests. (Yonghong)
2. Add struct file and struct vm_area_struct to btf_task_struct_ids, and
   use it in bpf_find_vma and stackmap.c. (Yonghong)
3. Fix inaccurate comments. (Yonghong)

Changes v1 => v2:
1. Share irq_work with stackmap.c. (Daniel)
2. Add tests for illegal writes to task/vma from the callback function.
   (Daniel)
3. Other small fixes.

Add helper bpf_find_vma. This can be used in some profiling use cases. It
might also be useful for LSM.

Song Liu (2):
  bpf: introduce helper bpf_find_vma
  selftests/bpf: add tests for bpf_find_vma

 include/linux/bpf.h                           |   1 +
 include/uapi/linux/bpf.h                      |  20 +++
 kernel/bpf/btf.c                              |   5 +-
 kernel/bpf/mmap_unlock_work.h                 |  65 ++++++++++
 kernel/bpf/stackmap.c                         |  80 ++----------
 kernel/bpf/task_iter.c                        |  76 ++++++++++--
 kernel/bpf/verifier.c                         |  34 ++++++
 kernel/trace/bpf_trace.c                      |   2 +
 tools/include/uapi/linux/bpf.h                |  20 +++
 .../selftests/bpf/prog_tests/find_vma.c       | 115 ++++++++++++++++++
 tools/testing/selftests/bpf/progs/find_vma.c  |  69 +++++++++++
 .../selftests/bpf/progs/find_vma_fail1.c      |  29 +++++
 .../selftests/bpf/progs/find_vma_fail2.c      |  29 +++++
 13 files changed, 464 insertions(+), 81 deletions(-)
 create mode 100644 kernel/bpf/mmap_unlock_work.h
 create mode 100644 tools/testing/selftests/bpf/prog_tests/find_vma.c
 create mode 100644 tools/testing/selftests/bpf/progs/find_vma.c
 create mode 100644 tools/testing/selftests/bpf/progs/find_vma_fail1.c
 create mode 100644 tools/testing/selftests/bpf/progs/find_vma_fail2.c

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2.30.2