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bpf: save the start of functions in bpf_prog_aux

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Introduce a new subprog_start field in bpf_prog_aux. This field may
be used by JIT compilers wanting to know the real absolute xlated
offset of the function being jitted. The func_info[func_id] may have
served this purpose, but func_info may be NULL, so JIT compilers
can't rely on it.

Signed-off-by: Anton Protopopov <a.s.protopopov@gmail.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20251019202145.3944697-3-a.s.protopopov@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Anton Protopopov 2025-10-19 20:21:30 +00:00 committed by Alexei Starovoitov
parent 6ea5fc92a0
commit f7d72d0b3f
2 changed files with 2 additions and 0 deletions
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1
include/linux/bpf.h
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@ -1623,6 +1623,7 @@ struct bpf_prog_aux {
u32 ctx_arg_info_size;
u32 max_rdonly_access;
u32 max_rdwr_access;
u32 subprog_start;
struct btf *attach_btf;
struct bpf_ctx_arg_aux *ctx_arg_info;
void __percpu *priv_stack_ptr;

1
kernel/bpf/verifier.c
View File

@ -21607,6 +21607,7 @@ static int jit_subprogs(struct bpf_verifier_env *env)
func[i]->aux->func_idx = i;
/* Below members will be freed only at prog->aux */
func[i]->aux->btf = prog->aux->btf;
func[i]->aux->subprog_start = subprog_start;
func[i]->aux->func_info = prog->aux->func_info;
func[i]->aux->func_info_cnt = prog->aux->func_info_cnt;
func[i]->aux->poke_tab = prog->aux->poke_tab;