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@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/
Suggested-by: Andrii Nakryiko <andrii.nakryiko@xxxxxxxxx>
Signed-off-by: Levi Zim <rsworktech@xxxxxxxxxxx>
---
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(-)
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base-commit: d0d106a2bd21499901299160744e5fe9f4c83ddb
change-id: 20250124-bpf_dynptr_probe-ab483c554f1a
Best regards,
--
Levi Zim <rsworktech@xxxxxxxxxxx>
