hi, this patchset adds unique uprobe and support to change userspace task's registers from within bpf uprobe program. We recently had several requests for tetragon to be able to change user application function return value or divert its execution through instruction pointer change. v1 changes (from rfc [1]): - added unique probe support - added more tests thanks, jirka [1] https://lore.kernel.org/bpf/20250801210238.2207429-1-jolsa@xxxxxxxxxx/ --- Jiri Olsa (11): uprobes: Add unique flag to uprobe consumer uprobes: Skip emulate/sstep on unique uprobe when ip is changed perf: Add support to attach standard unique uprobe bpf: Add support to attach uprobe_multi unique uprobe bpf: Allow uprobe program to change context registers libbpf: Add support to attach unique uprobe_multi uprobe libbpf: Add support to attach generic unique uprobe selftests/bpf: Add uprobe multi context registers changes test selftests/bpf: Add uprobe multi context ip register change test selftests/bpf: Add uprobe multi unique attach test selftests/bpf: Add uprobe unique attach test include/linux/bpf.h | 1 + include/linux/trace_events.h | 2 +- include/linux/uprobes.h | 1 + include/uapi/linux/bpf.h | 3 +- kernel/events/core.c | 12 ++++- kernel/events/uprobes.c | 43 ++++++++++++++-- kernel/trace/bpf_trace.c | 7 +-- kernel/trace/trace_event_perf.c | 4 +- kernel/trace/trace_probe.h | 2 +- kernel/trace/trace_uprobe.c | 9 ++-- tools/include/uapi/linux/bpf.h | 3 +- tools/lib/bpf/libbpf.c | 36 +++++++++++--- tools/lib/bpf/libbpf.h | 8 ++- tools/testing/selftests/bpf/prog_tests/bpf_cookie.c | 1 + tools/testing/selftests/bpf/prog_tests/uprobe.c | 111 ++++++++++++++++++++++++++++++++++++++++- tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c | 248 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ tools/testing/selftests/bpf/progs/uprobe_multi.c | 38 ++++++++++++++ tools/testing/selftests/bpf/progs/uprobe_multi_unique.c | 34 +++++++++++++ 18 files changed, 534 insertions(+), 29 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/uprobe_multi_unique.c
