linux-kernel - [PATCH 5.15 07/33] bpf: Convert PTR_TO_MEM_OR

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Date:   Fri, 29 Apr 2022 12:41:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hao Luo <haoluo@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>
Subject: [PATCH 5.15 07/33] bpf: Convert PTR_TO_MEM_OR_NULL to composable types.

From: Hao Luo <haoluo@...gle.com>

commit cf9f2f8d62eca810afbd1ee6cc0800202b000e57 upstream.

Remove PTR_TO_MEM_OR_NULL and replace it with PTR_TO_MEM combined with
flag PTR_MAYBE_NULL.

Signed-off-by: Hao Luo <haoluo@...gle.com>
Signed-off-by: Alexei Starovoitov <ast@...nel.org>
Link: https://lore.kernel.org/bpf/20211217003152.48334-7-haoluo@google.com
Cc: stable@...r.kernel.org # 5.15.x
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/linux/bpf.h   |    1 -
 kernel/bpf/btf.c      |    2 +-
 kernel/bpf/verifier.c |    2 +-
 3 files changed, 2 insertions(+), 3 deletions(-)

--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -502,7 +502,6 @@ enum bpf_reg_type {
 	PTR_TO_SOCK_COMMON_OR_NULL	= PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
 	PTR_TO_TCP_SOCK_OR_NULL		= PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
 	PTR_TO_BTF_ID_OR_NULL		= PTR_MAYBE_NULL | PTR_TO_BTF_ID,
-	PTR_TO_MEM_OR_NULL		= PTR_MAYBE_NULL | PTR_TO_MEM,
 
 	/* This must be the last entry. Its purpose is to ensure the enum is
 	 * wide enough to hold the higher bits reserved for bpf_type_flag.
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -5719,7 +5719,7 @@ int btf_prepare_func_args(struct bpf_ver
 				return -EINVAL;
 			}
 
-			reg->type = PTR_TO_MEM_OR_NULL;
+			reg->type = PTR_TO_MEM | PTR_MAYBE_NULL;
 			reg->id = ++env->id_gen;
 
 			continue;
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -13135,7 +13135,7 @@ static int do_check_common(struct bpf_ve
 				mark_reg_known_zero(env, regs, i);
 			else if (regs[i].type == SCALAR_VALUE)
 				mark_reg_unknown(env, regs, i);
-			else if (regs[i].type == PTR_TO_MEM_OR_NULL) {
+			else if (base_type(regs[i].type) == PTR_TO_MEM) {
 				const u32 mem_size = regs[i].mem_size;
 
 				mark_reg_known_zero(env, regs, i);