linux-kernel - [PATCH 5.10 031/158] bpf: Check the validity of max_rdwr_access for sock local storage map iterator

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Message-Id: <20220823080047.340687367@linuxfoundation.org>
Date:   Tue, 23 Aug 2022 10:26:03 +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, Hou Tao <houtao1@...wei.com>,
        Yonghong Song <yhs@...com>, Martin KaFai Lau <kafai@...com>,
        Alexei Starovoitov <ast@...nel.org>
Subject: [PATCH 5.10 031/158] bpf: Check the validity of max_rdwr_access for sock local storage map iterator

From: Hou Tao <houtao1@...wei.com>

commit 52bd05eb7c88e1ad8541a48873188ccebca9da26 upstream.

The value of sock local storage map is writable in map iterator, so check
max_rdwr_access instead of max_rdonly_access.

Fixes: 5ce6e77c7edf ("bpf: Implement bpf iterator for sock local storage map")
Signed-off-by: Hou Tao <houtao1@...wei.com>
Acked-by: Yonghong Song <yhs@...com>
Acked-by: Martin KaFai Lau <kafai@...com>
Link: https://lore.kernel.org/r/20220810080538.1845898-6-houtao@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/core/bpf_sk_storage.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/core/bpf_sk_storage.c
+++ b/net/core/bpf_sk_storage.c
@@ -823,7 +823,7 @@ static int bpf_iter_attach_map(struct bp
 	if (map->map_type != BPF_MAP_TYPE_SK_STORAGE)
 		goto put_map;
 
-	if (prog->aux->max_rdonly_access > map->value_size) {
+	if (prog->aux->max_rdwr_access > map->value_size) {
 		err = -EACCES;
 		goto put_map;
 	}