Patch "tipc: Fix kernel-infoleak due to uninitialized TLV value" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    tipc: Fix kernel-infoleak due to uninitialized TLV value

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     tipc-fix-kernel-infoleak-due-to-uninitialized-tlv-va.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit d260ed57d89c7977a00bd36cef986bb011b07556
Author: Shigeru Yoshida <syoshida@xxxxxxxxxx>
Date:   Sat Nov 11 01:39:47 2023 +0900

    tipc: Fix kernel-infoleak due to uninitialized TLV value
    
    [ Upstream commit fb317eb23b5ee4c37b0656a9a52a3db58d9dd072 ]
    
    KMSAN reported the following kernel-infoleak issue:
    
    =====================================================
    BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline]
    BUG: KMSAN: kernel-infoleak in copy_to_user_iter lib/iov_iter.c:24 [inline]
    BUG: KMSAN: kernel-infoleak in iterate_ubuf include/linux/iov_iter.h:29 [inline]
    BUG: KMSAN: kernel-infoleak in iterate_and_advance2 include/linux/iov_iter.h:245 [inline]
    BUG: KMSAN: kernel-infoleak in iterate_and_advance include/linux/iov_iter.h:271 [inline]
    BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x4ec/0x2bc0 lib/iov_iter.c:186
     instrument_copy_to_user include/linux/instrumented.h:114 [inline]
     copy_to_user_iter lib/iov_iter.c:24 [inline]
     iterate_ubuf include/linux/iov_iter.h:29 [inline]
     iterate_and_advance2 include/linux/iov_iter.h:245 [inline]
     iterate_and_advance include/linux/iov_iter.h:271 [inline]
     _copy_to_iter+0x4ec/0x2bc0 lib/iov_iter.c:186
     copy_to_iter include/linux/uio.h:197 [inline]
     simple_copy_to_iter net/core/datagram.c:532 [inline]
     __skb_datagram_iter.5+0x148/0xe30 net/core/datagram.c:420
     skb_copy_datagram_iter+0x52/0x210 net/core/datagram.c:546
     skb_copy_datagram_msg include/linux/skbuff.h:3960 [inline]
     netlink_recvmsg+0x43d/0x1630 net/netlink/af_netlink.c:1967
     sock_recvmsg_nosec net/socket.c:1044 [inline]
     sock_recvmsg net/socket.c:1066 [inline]
     __sys_recvfrom+0x476/0x860 net/socket.c:2246
     __do_sys_recvfrom net/socket.c:2264 [inline]
     __se_sys_recvfrom net/socket.c:2260 [inline]
     __x64_sys_recvfrom+0x130/0x200 net/socket.c:2260
     do_syscall_x64 arch/x86/entry/common.c:51 [inline]
     do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
     entry_SYSCALL_64_after_hwframe+0x63/0x6b
    
    Uninit was created at:
     slab_post_alloc_hook+0x103/0x9e0 mm/slab.h:768
     slab_alloc_node mm/slub.c:3478 [inline]
     kmem_cache_alloc_node+0x5f7/0xb50 mm/slub.c:3523
     kmalloc_reserve+0x13c/0x4a0 net/core/skbuff.c:560
     __alloc_skb+0x2fd/0x770 net/core/skbuff.c:651
     alloc_skb include/linux/skbuff.h:1286 [inline]
     tipc_tlv_alloc net/tipc/netlink_compat.c:156 [inline]
     tipc_get_err_tlv+0x90/0x5d0 net/tipc/netlink_compat.c:170
     tipc_nl_compat_recv+0x1042/0x15d0 net/tipc/netlink_compat.c:1324
     genl_family_rcv_msg_doit net/netlink/genetlink.c:972 [inline]
     genl_family_rcv_msg net/netlink/genetlink.c:1052 [inline]
     genl_rcv_msg+0x1220/0x12c0 net/netlink/genetlink.c:1067
     netlink_rcv_skb+0x4a4/0x6a0 net/netlink/af_netlink.c:2545
     genl_rcv+0x41/0x60 net/netlink/genetlink.c:1076
     netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]
     netlink_unicast+0xf4b/0x1230 net/netlink/af_netlink.c:1368
     netlink_sendmsg+0x1242/0x1420 net/netlink/af_netlink.c:1910
     sock_sendmsg_nosec net/socket.c:730 [inline]
     __sock_sendmsg net/socket.c:745 [inline]
     ____sys_sendmsg+0x997/0xd60 net/socket.c:2588
     ___sys_sendmsg+0x271/0x3b0 net/socket.c:2642
     __sys_sendmsg net/socket.c:2671 [inline]
     __do_sys_sendmsg net/socket.c:2680 [inline]
     __se_sys_sendmsg net/socket.c:2678 [inline]
     __x64_sys_sendmsg+0x2fa/0x4a0 net/socket.c:2678
     do_syscall_x64 arch/x86/entry/common.c:51 [inline]
     do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
     entry_SYSCALL_64_after_hwframe+0x63/0x6b
    
    Bytes 34-35 of 36 are uninitialized
    Memory access of size 36 starts at ffff88802d464a00
    Data copied to user address 00007ff55033c0a0
    
    CPU: 0 PID: 30322 Comm: syz-executor.0 Not tainted 6.6.0-14500-g1c41041124bd #10
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-1.fc38 04/01/2014
    =====================================================
    
    tipc_add_tlv() puts TLV descriptor and value onto `skb`. This size is
    calculated with TLV_SPACE() macro. It adds the size of struct tlv_desc and
    the length of TLV value passed as an argument, and aligns the result to a
    multiple of TLV_ALIGNTO, i.e., a multiple of 4 bytes.
    
    If the size of struct tlv_desc plus the length of TLV value is not aligned,
    the current implementation leaves the remaining bytes uninitialized. This
    is the cause of the above kernel-infoleak issue.
    
    This patch resolves this issue by clearing data up to an aligned size.
    
    Fixes: d0796d1ef63d ("tipc: convert legacy nl bearer dump to nl compat")
    Signed-off-by: Shigeru Yoshida <syoshida@xxxxxxxxxx>
    Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
    Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/tipc/netlink_compat.c b/net/tipc/netlink_compat.c
index 5bc076f2fa74a..c763008a8adba 100644
--- a/net/tipc/netlink_compat.c
+++ b/net/tipc/netlink_compat.c
@@ -102,6 +102,7 @@ static int tipc_add_tlv(struct sk_buff *skb, u16 type, void *data, u16 len)
 		return -EMSGSIZE;
 
 	skb_put(skb, TLV_SPACE(len));
+	memset(tlv, 0, TLV_SPACE(len));
 	tlv->tlv_type = htons(type);
 	tlv->tlv_len = htons(TLV_LENGTH(len));
 	if (len && data)



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