On Tue, Sep 9, 2025 at 8:39 AM Jiri Olsa <[email protected]> wrote: > > hi, > 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. > > This patchset adds support for uprobe program to change app's registers > including instruction pointer. > > v3 changes: > - deny attach of kprobe,multi with kprobe_write_ctx set [Alexei] > - added more tests for denied kprobe attachment > > thanks, > jirka > > > --- > Jiri Olsa (6): > bpf: Allow uprobe program to change context registers > uprobe: Do not emulate/sstep original instruction when ip is changed > selftests/bpf: Add uprobe context registers changes test > selftests/bpf: Add uprobe context ip register change test > selftests/bpf: Add kprobe write ctx attach test > selftests/bpf: Add kprobe multi write ctx attach test >
For the series: Acked-by: Andrii Nakryiko <[email protected]> Question is which tree will this go through? Most changes are in BPF, so probably bpf-next, right? > include/linux/bpf.h | 1 + > kernel/events/core.c | 4 +++ > kernel/events/uprobes.c | 7 +++++ > kernel/trace/bpf_trace.c | 7 +++-- > tools/testing/selftests/bpf/prog_tests/attach_probe.c | 28 > +++++++++++++++++ > tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c | 27 > ++++++++++++++++ > tools/testing/selftests/bpf/prog_tests/uprobe.c | 156 > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++- > tools/testing/selftests/bpf/progs/kprobe_write_ctx.c | 22 > +++++++++++++ > tools/testing/selftests/bpf/progs/test_uprobe.c | 38 > +++++++++++++++++++++++ > 9 files changed, 287 insertions(+), 3 deletions(-) > create mode 100644 tools/testing/selftests/bpf/progs/kprobe_write_ctx.c
