mbox series

[bpf-next,v2,0/7] bpf: Add probe_read_{kernel,user}_dynptr and copy_from_user_dynptr

Message ID 20250125-bpf_dynptr_probe-v2-0-c42c87f97afe@outlook.com (mailing list archive)
Headers show
Series bpf: Add probe_read_{kernel,user}_dynptr and copy_from_user_dynptr | expand

Message

Levi Zim via B4 Relay Jan. 25, 2025, 8:29 a.m. UTC 
This series introduce the dynptr counterpart of the
bpf_probe_read_{kernel,user} helpers and bpf_copy_from_user helper.

These helpers are helpful for reading variable-length data from kernel
memory into dynptr without going through an intermediate buffer.

Link: https://lore.kernel.org/bpf/MEYP282MB2312CFCE5F7712FDE313215AC64D2@MEYP282MB2312.AUSP282.PROD.OUTLOOK.COM/
Suggested-by: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Signed-off-by: Levi Zim <rsworktech@outlook.com>
---
Changes in v2:
- Add missing bpf-next prefix. I forgot it in the initial series. Sorry
  about that.
- Link to v1: https://lore.kernel.org/r/20250125-bpf_dynptr_probe-v1-0-c3cb121f6951@outlook.com

---
Levi Zim (7):
      bpf: Implement bpf_probe_read_kernel_dynptr helper
      bpf: Implement bpf_probe_read_user_dynptr helper
      bpf: Implement bpf_copy_from_user_dynptr helper
      tools headers UAPI: Update tools's copy of bpf.h header
      selftests/bpf: probe_read_kernel_dynptr test
      selftests/bpf: probe_read_user_dynptr test
      selftests/bpf: copy_from_user_dynptr test

 include/linux/bpf.h                                |   3 +
 include/uapi/linux/bpf.h                           |  49 ++++++++++
 kernel/bpf/helpers.c                               |  53 ++++++++++-
 kernel/trace/bpf_trace.c                           |  72 ++++++++++++++
 tools/include/uapi/linux/bpf.h                     |  49 ++++++++++
 tools/testing/selftests/bpf/prog_tests/dynptr.c    |  45 ++++++++-
 tools/testing/selftests/bpf/progs/dynptr_success.c | 106 +++++++++++++++++++++
 7 files changed, 374 insertions(+), 3 deletions(-)
---
base-commit: d0d106a2bd21499901299160744e5fe9f4c83ddb
change-id: 20250124-bpf_dynptr_probe-ab483c554f1a

Best regards,