netdev - RE: [PATCH net] tipc: fix one byte leak in tipc_sk_set_orig

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Date:   Wed, 9 May 2018 17:19:27 +0000
From:   Jon Maloy <jon.maloy@...csson.com>
To:     Eric Dumazet <edumazet@...gle.com>,
        "David S . Miller" <davem@...emloft.net>
CC:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Ying Xue <ying.xue@...driver.com>
Subject: RE: [PATCH net] tipc: fix one byte leak in tipc_sk_set_orig_addr()

Acked-by: Jon Maloy <jon.maloy@...csson.com>

Thank you Eric.

> -----Original Message-----
> From: Eric Dumazet [mailto:edumazet@...gle.com]
> Sent: Wednesday, May 09, 2018 09:50
> To: David S . Miller <davem@...emloft.net>
> Cc: netdev <netdev@...r.kernel.org>; Eric Dumazet
> <edumazet@...gle.com>; Eric Dumazet <eric.dumazet@...il.com>; Jon
> Maloy <jon.maloy@...csson.com>; Ying Xue <ying.xue@...driver.com>
> Subject: [PATCH net] tipc: fix one byte leak in tipc_sk_set_orig_addr()
> 
> sysbot/KMSAN reported an uninit-value in recvmsg() that I tracked down to
> tipc_sk_set_orig_addr(), missing
> srcaddr->member.scope initialization.
> 
> This patches moves srcaddr->sock.scope init to follow fields order and ease
> future verifications.
> 
> BUG: KMSAN: uninit-value in copy_to_user include/linux/uaccess.h:184
> [inline]
> BUG: KMSAN: uninit-value in move_addr_to_user+0x32e/0x530
> net/socket.c:226
> CPU: 0 PID: 4549 Comm: syz-executor287 Not tainted 4.17.0-rc3+ #88
> Hardware name: Google Google Compute Engine/Google Compute Engine,
> BIOS Google 01/01/2011 Call Trace:
>  __dump_stack lib/dump_stack.c:77 [inline]
>  dump_stack+0x185/0x1d0 lib/dump_stack.c:113
>  kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
>  kmsan_internal_check_memory+0x135/0x1e0 mm/kmsan/kmsan.c:1157
>  kmsan_copy_to_user+0x69/0x160 mm/kmsan/kmsan.c:1199  copy_to_user
> include/linux/uaccess.h:184 [inline]
>  move_addr_to_user+0x32e/0x530 net/socket.c:226
>  ___sys_recvmsg+0x4e2/0x810 net/socket.c:2285  __sys_recvmsg
> net/socket.c:2328 [inline]  __do_sys_recvmsg net/socket.c:2338 [inline]
> __se_sys_recvmsg net/socket.c:2335 [inline]
>  __x64_sys_recvmsg+0x325/0x460 net/socket.c:2335
>  do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
>  entry_SYSCALL_64_after_hwframe+0x44/0xa9
> RIP: 0033:0x4455e9
> RSP: 002b:00007fe3bd36ddb8 EFLAGS: 00000246 ORIG_RAX:
> 000000000000002f
> RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 00000000004455e9
> RDX: 0000000000002002 RSI: 0000000020000400 RDI: 0000000000000003
> RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 00007fff98ce4b6f R14: 00007fe3bd36e9c0 R15: 0000000000000003
> 
> Local variable description: ----addr@...sys_recvmsg Variable was created
> at:
>  ___sys_recvmsg+0xd5/0x810 net/socket.c:2246  __sys_recvmsg
> net/socket.c:2328 [inline]  __do_sys_recvmsg net/socket.c:2338 [inline]
> __se_sys_recvmsg net/socket.c:2335 [inline]
>  __x64_sys_recvmsg+0x325/0x460 net/socket.c:2335
> 
> Byte 19 of 32 is uninitialized
> 
> Fixes: 31c82a2d9d51 ("tipc: add second source address to
> recvmsg()/recvfrom()")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: syzbot <syzkaller@...glegroups.com>
> Cc: Jon Maloy <jon.maloy@...csson.com>
> Cc: Ying Xue <ying.xue@...driver.com>
> ---
>  net/tipc/socket.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/tipc/socket.c b/net/tipc/socket.c index
> 252a52ae0893261fc6f146ad81111c59f375fdce..6be21575503aa532014e7aa141
> 5b2bf294757308 100644
> --- a/net/tipc/socket.c
> +++ b/net/tipc/socket.c
> @@ -1516,10 +1516,10 @@ static void tipc_sk_set_orig_addr(struct msghdr
> *m, struct sk_buff *skb)
> 
>  	srcaddr->sock.family = AF_TIPC;
>  	srcaddr->sock.addrtype = TIPC_ADDR_ID;
> +	srcaddr->sock.scope = 0;
>  	srcaddr->sock.addr.id.ref = msg_origport(hdr);
>  	srcaddr->sock.addr.id.node = msg_orignode(hdr);
>  	srcaddr->sock.addr.name.domain = 0;
> -	srcaddr->sock.scope = 0;
>  	m->msg_namelen = sizeof(struct sockaddr_tipc);
> 
>  	if (!msg_in_group(hdr))
> @@ -1528,6 +1528,7 @@ static void tipc_sk_set_orig_addr(struct msghdr
> *m, struct sk_buff *skb)
>  	/* Group message users may also want to know sending member's id
> */
>  	srcaddr->member.family = AF_TIPC;
>  	srcaddr->member.addrtype = TIPC_ADDR_NAME;
> +	srcaddr->member.scope = 0;
>  	srcaddr->member.addr.name.name.type = msg_nametype(hdr);
>  	srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)-
> >orig_member;
>  	srcaddr->member.addr.name.domain = 0;
> --
> 2.17.0.441.gb46fe60e1d-goog