diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c index e835164189f160bbbc0da247fed68a835d5f6944..4b951458c9fc990d278bdb957360e02355024f8c 100644 --- a/arch/x86/net/bpf_jit_comp.c +++ b/arch/x86/net/bpf_jit_comp.c @@ -570,6 +570,9 @@ static void bpf_tail_call_direct_fixup(struct bpf_prog *prog) for (i = 0; i < prog->aux->size_poke_tab; i++) { poke = &prog->aux->poke_tab[i]; + if (poke->aux && poke->aux != prog->aux) + continue; + WARN_ON_ONCE(READ_ONCE(poke->tailcall_target_stable)); if (poke->reason != BPF_POKE_REASON_TAIL_CALL) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index f309fc1509f2cbbe9ece2ee55df6f28a29b69165..e8e2b0393ca93409c057511cd26feb0aea3a95c8 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -780,6 +780,7 @@ struct bpf_jit_poke_descriptor { void *tailcall_target; void *tailcall_bypass; void *bypass_addr; + void *aux; union { struct { struct bpf_map *map; diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c index 034ad93a1ad717485641855b0f4f8eb6c841bfb8..9b15774983738db74e13786fcb66adf450140378 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -2236,8 +2236,14 @@ static void bpf_prog_free_deferred(struct work_struct *work) #endif if (aux->dst_trampoline) bpf_trampoline_put(aux->dst_trampoline); - for (i = 0; i < aux->func_cnt; i++) + for (i = 0; i < aux->func_cnt; i++) { + /* We can just unlink the subprog poke descriptor table as + * it was originally linked to the main program and is also + * released along with it. + */ + aux->func[i]->aux->poke_tab = NULL; bpf_jit_free(aux->func[i]); + } if (aux->func_cnt) { kfree(aux->func); bpf_prog_unlock_free(aux->prog); diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index be38bb930bf1e084a059485f2049bdd0418c2814..42a4063de7cd24d5f946f0c95815501fef3019e2 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -12121,33 +12121,19 @@ static int jit_subprogs(struct bpf_verifier_env *env) goto out_free; func[i]->is_func = 1; func[i]->aux->func_idx = i; - /* the btf and func_info will be freed only at prog->aux */ + /* Below members will be freed only at prog->aux */ func[i]->aux->btf = prog->aux->btf; func[i]->aux->func_info = prog->aux->func_info; + func[i]->aux->poke_tab = prog->aux->poke_tab; + func[i]->aux->size_poke_tab = prog->aux->size_poke_tab; for (j = 0; j < prog->aux->size_poke_tab; j++) { - u32 insn_idx = prog->aux->poke_tab[j].insn_idx; - int ret; + struct bpf_jit_poke_descriptor *poke; - if (!(insn_idx >= subprog_start && - insn_idx <= subprog_end)) - continue; - - ret = bpf_jit_add_poke_descriptor(func[i], - &prog->aux->poke_tab[j]); - if (ret < 0) { - verbose(env, "adding tail call poke descriptor failed\n"); - goto out_free; - } - - func[i]->insnsi[insn_idx - subprog_start].imm = ret + 1; - - map_ptr = func[i]->aux->poke_tab[ret].tail_call.map; - ret = map_ptr->ops->map_poke_track(map_ptr, func[i]->aux); - if (ret < 0) { - verbose(env, "tracking tail call prog failed\n"); - goto out_free; - } + poke = &prog->aux->poke_tab[j]; + if (poke->insn_idx < subprog_end && + poke->insn_idx >= subprog_start) + poke->aux = func[i]->aux; } /* Use bpf_prog_F_tag to indicate functions in stack traces. @@ -12178,18 +12164,6 @@ static int jit_subprogs(struct bpf_verifier_env *env) cond_resched(); } - /* Untrack main program's aux structs so that during map_poke_run() - * we will not stumble upon the unfilled poke descriptors; each - * of the main program's poke descs got distributed across subprogs - * and got tracked onto map, so we are sure that none of them will - * be missed after the operation below - */ - for (i = 0; i < prog->aux->size_poke_tab; i++) { - map_ptr = prog->aux->poke_tab[i].tail_call.map; - - map_ptr->ops->map_poke_untrack(map_ptr, prog->aux); - } - /* at this point all bpf functions were successfully JITed * now populate all bpf_calls with correct addresses and * run last pass of JIT @@ -12267,14 +12241,22 @@ static int jit_subprogs(struct bpf_verifier_env *env) bpf_prog_jit_attempt_done(prog); return 0; out_free: + /* We failed JIT'ing, so at this point we need to unregister poke + * descriptors from subprogs, so that kernel is not attempting to + * patch it anymore as we're freeing the subprog JIT memory. + */ + for (i = 0; i < prog->aux->size_poke_tab; i++) { + map_ptr = prog->aux->poke_tab[i].tail_call.map; + map_ptr->ops->map_poke_untrack(map_ptr, prog->aux); + } + /* At this point we're guaranteed that poke descriptors are not + * live anymore. We can just unlink its descriptor table as it's + * released with the main prog. + */ for (i = 0; i < env->subprog_cnt; i++) { if (!func[i]) continue; - - for (j = 0; j < func[i]->aux->size_poke_tab; j++) { - map_ptr = func[i]->aux->poke_tab[j].tail_call.map; - map_ptr->ops->map_poke_untrack(map_ptr, func[i]->aux); - } + func[i]->aux->poke_tab = NULL; bpf_jit_free(func[i]); } kfree(func);