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| author | Dave Marchevsky <davemarchevsky@fb.com> | 2023-03-10 15:07:42 -0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2023-03-10 16:38:05 -0800 |
| commit | 738c96d5e2e3700b370f02ac84a9dc159ca81f25 (patch) | |
| tree | 8da5ca672f2f3e602ba1606a2d930b07aa537aa6 /tools/testing/selftests/bpf/prog_tests/linked_funcs.c | |
| parent | c8e18754091479fac3f5b6c053c6bc4be0b7fb11 (diff) | |
bpf: Allow local kptrs to be exchanged via bpf_kptr_xchg
The previous patch added necessary plumbing for verifier and runtime to
know what to do with non-kernel PTR_TO_BTF_IDs in map values, but didn't
provide any way to get such local kptrs into a map value. This patch
modifies verifier handling of bpf_kptr_xchg to allow MEM_ALLOC kptr
types.
check_reg_type is modified accept MEM_ALLOC-flagged input to
bpf_kptr_xchg despite such types not being in btf_ptr_types. This could
have been done with a MAYBE_MEM_ALLOC equivalent to MAYBE_NULL, but
bpf_kptr_xchg is the only helper that I can forsee using
MAYBE_MEM_ALLOC, so keep it special-cased for now.
The verifier tags bpf_kptr_xchg retval MEM_ALLOC if and only if the BTF
associated with the retval is not kernel BTF.
Signed-off-by: Dave Marchevsky <davemarchevsky@fb.com>
Link: https://lore.kernel.org/r/20230310230743.2320707-3-davemarchevsky@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/linked_funcs.c')
0 files changed, 0 insertions, 0 deletions