selftests/bpf: Add tests for pointer type merge at a shared load

Cover the ways in which the type recorded for a shared load used to lose
the BPF_PROBE_MEM rewrite which would then trigger a NULL deref if not
handled properly.

  # LDLIBS=-static PKG_CONFIG='pkg-config --static' ./vmtest.sh -- ./test_progs -t mem_rdonly_untrusted
  [...]
  #242/1   mem_rdonly_untrusted/btf_id_to_ptr_mem:OK
  #242/2   mem_rdonly_untrusted/ldx_is_ok_bad_addr:OK
  #242/3   mem_rdonly_untrusted/ldx_is_ok_good_addr:OK
  #242/4   mem_rdonly_untrusted/offset_not_tracked:OK
  #242/5   mem_rdonly_untrusted/stx_not_ok:OK
  #242/6   mem_rdonly_untrusted/atomic_not_ok:OK
  #242/7   mem_rdonly_untrusted/atomic_rmw_not_ok:OK
  #242/8   mem_rdonly_untrusted/kfunc_param_not_ok:OK
  #242/9   mem_rdonly_untrusted/mixed_mem_type:OK
  #242/10  mem_rdonly_untrusted/mixed_mem_untrusted_btf_id_type:OK
  #242/11  mem_rdonly_untrusted/mixed_mem_btf_id_type:OK
  #242/12  mem_rdonly_untrusted/mixed_rdonly_mem_btf_id_type:OK
  #242/13  mem_rdonly_untrusted/mixed_mem_mem_type:OK
  #242/14  mem_rdonly_untrusted/mixed_map_value_mem_type:OK
  #242/15  mem_rdonly_untrusted/mixed_stack_mem_type:OK
  #242/16  mem_rdonly_untrusted/diff_size_access:OK
  #242/17  mem_rdonly_untrusted/misaligned_access:OK
  #242/18  mem_rdonly_untrusted/null_check:OK
  #242/19  mem_rdonly_untrusted/ldx_is_ok_commuted_addr:OK
  #242/20  mem_rdonly_untrusted/helper_param_not_ok:OK
  #242     mem_rdonly_untrusted:OK
  Summary: 1/20 PASSED, 0 SKIPPED, 0/0 FAILED

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/bpf/20260817141015.878071-1-daniel@iogearbox.net
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

0 files changed, 0 insertions, 0 deletions