hi,
first version of this patchset added helper for this functionality,
but based Alexei's feedback [1], changing it to kfunc.
With the current build_id_parse function as kfunc we can't effectively
check buffer size provided by user. Therefore adding new function as
bpf kfunc:
int bpf_vma_build_id_parse(struct vm_area_struct *vma,
unsigned char *build_id,
size_t build_id__sz);
that triggers kfunc's verifier check for build_id/build_id__sz buffer
size and calls build_id_parse.
v3 changes:
- restrict bpf_vma_build_id_parse to bpf_find_vma callback
- move bpf_vma_build_id_parse to kernel/trace/bpf_trace.c
and add new tracing_kfunc_set
thanks,
jirka
[1] https://lore.kernel.org/bpf/CAADnVQKyT4Mm4EdTCYK8c070E-BwPZS_FOkWKLJC80riSGmLTg@xxxxxxxxxxxxxx/
---
Jiri Olsa (2):
bpf: Add bpf_vma_build_id_parse function and kfunc
selftests/bpf: Add bpf_vma_build_id_parse kfunc test
include/linux/bpf.h | 4 ++++
kernel/bpf/verifier.c | 26 ++++++++++++++++++++++++++
kernel/trace/bpf_trace.c | 31 +++++++++++++++++++++++++++++++
tools/testing/selftests/bpf/prog_tests/bpf_vma_build_id_parse.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
tools/testing/selftests/bpf/progs/bpf_vma_build_id_parse.c | 40 ++++++++++++++++++++++++++++++++++++++++
5 files changed, 189 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/bpf_vma_build_id_parse.c
create mode 100644 tools/testing/selftests/bpf/progs/bpf_vma_build_id_parse.c
