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. v2 changes: - moving back to original change without the uniqeu/exclusive flag as discussed in here [1] thanks, jirka [1] https://lore.kernel.org/bpf/CAEf4BzbxjRwxhJTLUgJNwR-vEbDybBpawNsRb+y+PiDsxzT=eA@xxxxxxxxxxxxxx/ --- Jiri Olsa (4): 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 include/linux/bpf.h | 1 + kernel/events/core.c | 4 +++ kernel/events/uprobes.c | 7 +++++ kernel/trace/bpf_trace.c | 3 +- tools/testing/selftests/bpf/prog_tests/uprobe.c | 156 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++- tools/testing/selftests/bpf/progs/test_uprobe.c | 38 +++++++++++++++++++++++++ 6 files changed, 206 insertions(+), 3 deletions(-)
