On Fri, Sep 12, 2025 at 01:28:55PM -0700, Ihor Solodrai wrote: > On 9/9/25 9:41 AM, Andrii Nakryiko wrote: > > On Tue, Sep 9, 2025 at 8:39 AM Jiri Olsa <jolsa@xxxxxxxxxx> 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 <andrii@xxxxxxxxxx> > > > > Question is which tree will this go through? Most changes are in BPF, > > so probably bpf-next, right? > > Hi Jiri. > > This series does not apply to current bpf-next, see below. > > Could you please respin it with bpf-next tag? > E.g. "[PATCH v4 bpf-next 0/6] ..." > hi, the uprobe change it needs to be on top of the optimized uprobes (tip/perf/core) but the bpf selftests patches could be applied on bpf-next/master and disabled in CI until tip/perf/core changes are merged in? thanks, jirka > Thanks! > > $ git log -1 --oneline > a578b54a8ad2 (HEAD -> master, origin/master, origin/HEAD, > kernel-patches/bpf-next) Merge branch > 'bpf-report-arena-faults-to-bpf-streams' > $ b4 am 20250909123857.315599-1-jolsa@xxxxxxxxxx > [...] > $ git am ./v3_20250909_jolsa_uprobe_bpf_allow_to_change_app_registers_from_uprobe_registers.mbx > Applying: bpf: Allow uprobe program to change context registers > Applying: uprobe: Do not emulate/sstep original instruction when ip is > changed > error: patch failed: kernel/events/uprobes.c:2768 > error: kernel/events/uprobes.c: patch does not apply > Patch failed at 0002 uprobe: Do not emulate/sstep original instruction when > ip is changed > [...] > > > > > > 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 >
