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Tue, 26 Sep 2023 05:51:26 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEEVI/pC34D6pyrHS7ZQQ482FSTT8zWu5lwWdl1pSWAmn+Ta/fvn4yAahbasCU3vyRvqUqqPA== X-Received: by 2002:a05:6a21:3381:b0:160:d030:ae9 with SMTP id yy1-20020a056a21338100b00160d0300ae9mr2043347pzb.25.1695732686492; Tue, 26 Sep 2023 05:51:26 -0700 (PDT) Received: from kernel-devel.local ([240d:1a:c0d:9f00:245e:16ff:fe87:c960]) by smtp.gmail.com with ESMTPSA id a5-20020a170902ee8500b001c62d63b817sm1701166pld.179.2023.09.26.05.51.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 Sep 2023 05:51:26 -0700 (PDT) From: Shigeru Yoshida To: jmaloy@redhat.com, ying.xue@windriver.com Cc: netdev@vger.kernel.org, tipc-discussion@lists.sourceforge.net, linux-kernel@vger.kernel.org, Shigeru Yoshida , syzbot+9425c47dccbcb4c17d51@syzkaller.appspotmail.com Subject: [PATCH] tipc: Fix uninit-value access in __tipc_nl_bearer_enable() Date: Tue, 26 Sep 2023 21:51:20 +0900 Message-ID: <20230926125120.152133-1-syoshida@redhat.com> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" syzbot reported the following uninit-value access issue: =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D BUG: KMSAN: uninit-value in strscpy+0xc4/0x160 strscpy+0xc4/0x160 bearer_name_validate net/tipc/bearer.c:147 [inline] tipc_enable_bearer net/tipc/bearer.c:259 [inline] __tipc_nl_bearer_enable+0x634/0x2220 net/tipc/bearer.c:1043 tipc_nl_bearer_enable+0x3c/0x70 net/tipc/bearer.c:1052 genl_family_rcv_msg_doit net/netlink/genetlink.c:971 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1051 [inline] genl_rcv_msg+0x11ec/0x1290 net/netlink/genetlink.c:1066 netlink_rcv_skb+0x371/0x650 net/netlink/af_netlink.c:2545 genl_rcv+0x40/0x60 net/netlink/genetlink.c:1075 netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline] netlink_unicast+0xf47/0x1250 net/netlink/af_netlink.c:1368 netlink_sendmsg+0x1238/0x13d0 net/netlink/af_netlink.c:1910 sock_sendmsg_nosec net/socket.c:730 [inline] sock_sendmsg net/socket.c:753 [inline] ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2540 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2594 __sys_sendmsg net/socket.c:2623 [inline] __do_sys_sendmsg net/socket.c:2632 [inline] __se_sys_sendmsg net/socket.c:2630 [inline] __x64_sys_sendmsg+0x307/0x490 net/socket.c:2630 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Uninit was created at: slab_post_alloc_hook+0x12f/0xb70 mm/slab.h:767 slab_alloc_node mm/slub.c:3478 [inline] kmem_cache_alloc_node+0x577/0xa80 mm/slub.c:3523 kmalloc_reserve+0x148/0x470 net/core/skbuff.c:559 __alloc_skb+0x318/0x740 net/core/skbuff.c:644 alloc_skb include/linux/skbuff.h:1286 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1214 [inline] netlink_sendmsg+0xb34/0x13d0 net/netlink/af_netlink.c:1885 sock_sendmsg_nosec net/socket.c:730 [inline] sock_sendmsg net/socket.c:753 [inline] ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2540 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2594 __sys_sendmsg net/socket.c:2623 [inline] __do_sys_sendmsg net/socket.c:2632 [inline] __se_sys_sendmsg net/socket.c:2630 [inline] __x64_sys_sendmsg+0x307/0x490 net/socket.c:2630 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Bearer names must be null-terminated strings. If a bearer name which is not null-terminated is passed through netlink, strcpy() and similar functions can cause buffer overrun. This causes the above issue. This patch fixes this issue by returning -EINVAL if a non-null-terminated bearer name is passed. Fixes: 0655f6a8635b ("tipc: add bearer disable/enable to new netlink api") Reported-and-tested-by: syzbot+9425c47dccbcb4c17d51@syzkaller.appspotmail.c= om Closes: https://syzkaller.appspot.com/bug?extid=3D9425c47dccbcb4c17d51 Signed-off-by: Shigeru Yoshida Reviewed-by: Simon Horman --- net/tipc/bearer.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c index 2cde375477e3..62047d20e14d 100644 --- a/net/tipc/bearer.c +++ b/net/tipc/bearer.c @@ -1025,6 +1025,10 @@ int __tipc_nl_bearer_enable(struct sk_buff *skb, str= uct genl_info *info) =20 bearer =3D nla_data(attrs[TIPC_NLA_BEARER_NAME]); =20 + if (bearer[strnlen(bearer, + nla_len(attrs[TIPC_NLA_BEARER_NAME]))] !=3D '\0') + return -EINVAL; + if (attrs[TIPC_NLA_BEARER_DOMAIN]) domain =3D nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]); =20 --=20 2.41.0