hi, this patchset is adding support for session uprobe attachment and using it through bpf link for bpf programs. The session means that the uprobe consumer is executed on entry and return of probed function with additional control: - entry callback can control execution of the return callback - entry and return callbacks can share data/cookie Uprobe changes (on top of perf/core [1] are posted in here [2]. This patchset is based on bpf-next/master and will be merged once we pull [2] in bpf-next/master. v8 changes: - split and sepatate only the bpf-next/master patches - rebased and reposted to proper ppl/lists thanks, jirka [1] git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git perf/core [2] https://lore.kernel.org/bpf/20241018202252.693462-1-jolsa@xxxxxxxxxx/T/#ma43c549c4bf684ca1b17fa638aa5e7cbb46893e9 --- Jiri Olsa (13): bpf: Allow return values 0 and 1 for kprobe session bpf: Force uprobe bpf program to always return 0 bpf: Add support for uprobe multi session attach bpf: Add support for uprobe multi session context libbpf: Add support for uprobe multi session attach selftests/bpf: Add uprobe session test selftests/bpf: Add uprobe session cookie test selftests/bpf: Add uprobe session recursive test selftests/bpf: Add uprobe session verifier test for return value selftests/bpf: Add kprobe session verifier test for return value selftests/bpf: Add uprobe session single consumer test selftests/bpf: Add uprobe sessions to consumer test selftests/bpf: Add threads to consumer test include/uapi/linux/bpf.h | 1 + kernel/bpf/syscall.c | 9 ++- kernel/bpf/verifier.c | 10 +++ kernel/trace/bpf_trace.c | 57 +++++++++++---- tools/include/uapi/linux/bpf.h | 1 + tools/lib/bpf/bpf.c | 1 + tools/lib/bpf/libbpf.c | 19 ++++- tools/lib/bpf/libbpf.h | 4 +- tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c | 2 + tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c | 336 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------- tools/testing/selftests/bpf/progs/kprobe_multi_verifier.c | 31 ++++++++ tools/testing/selftests/bpf/progs/uprobe_multi_consumers.c | 6 +- tools/testing/selftests/bpf/progs/uprobe_multi_session.c | 71 ++++++++++++++++++ tools/testing/selftests/bpf/progs/uprobe_multi_session_cookie.c | 48 ++++++++++++ tools/testing/selftests/bpf/progs/uprobe_multi_session_recursive.c | 44 +++++++++++ tools/testing/selftests/bpf/progs/uprobe_multi_session_single.c | 44 +++++++++++ tools/testing/selftests/bpf/progs/uprobe_multi_verifier.c | 31 ++++++++ 17 files changed, 654 insertions(+), 61 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/kprobe_multi_verifier.c create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_session.c create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_session_cookie.c create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_session_recursive.c create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_session_single.c create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_verifier.c
