TLDRVuln - Cybersecurity Vulnerabilities Made Simple

In the Linux kernel, the following vulnerability has been resolved:

dccp: fix dccp_v4_err()/dccp_v6_err() again

dh->dccph_x is the 9th byte (offset 8) in "struct dccp_hdr",

not in the "byte 7" as Jann claimed.

We need to make sure the ICMP messages are big enough,

using more standard ways (no more assumptions).

syzbot reported:

BUG: KMSAN: uninit-value in pskb_may_pull_reason include/linux/skbuff.h:2667 [inline]

BUG: KMSAN: uninit-value in pskb_may_pull include/linux/skbuff.h:2681 [inline]

BUG: KMSAN: uninit-value in dccp_v6_err+0x426/0x1aa0 net/dccp/ipv6.c:94

pskb_may_pull_reason include/linux/skbuff.h:2667 [inline]

pskb_may_pull include/linux/skbuff.h:2681 [inline]

dccp_v6_err+0x426/0x1aa0 net/dccp/ipv6.c:94

icmpv6_notify+0x4c7/0x880 net/ipv6/icmp.c:867

icmpv6_rcv+0x19d5/0x30d0

ip6_protocol_deliver_rcu+0xda6/0x2a60 net/ipv6/ip6_input.c:438

ip6_input_finish net/ipv6/ip6_input.c:483 [inline]

NF_HOOK include/linux/netfilter.h:304 [inline]

ip6_input+0x15d/0x430 net/ipv6/ip6_input.c:492

ip6_mc_input+0xa7e/0xc80 net/ipv6/ip6_input.c:586

dst_input include/net/dst.h:468 [inline]

ip6_rcv_finish+0x5db/0x870 net/ipv6/ip6_input.c:79

NF_HOOK include/linux/netfilter.h:304 [inline]

ipv6_rcv+0xda/0x390 net/ipv6/ip6_input.c:310

__netif_receive_skb_one_core net/core/dev.c:5523 [inline]

__netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5637

netif_receive_skb_internal net/core/dev.c:5723 [inline]

netif_receive_skb+0x58/0x660 net/core/dev.c:5782

tun_rx_batched+0x83b/0x920

tun_get_user+0x564c/0x6940 drivers/net/tun.c:2002

tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048

call_write_iter include/linux/fs.h:1985 [inline]

new_sync_write fs/read_write.c:491 [inline]

vfs_write+0x8ef/0x15c0 fs/read_write.c:584

ksys_write+0x20f/0x4c0 fs/read_write.c:637

__do_sys_write fs/read_write.c:649 [inline]

__se_sys_write fs/read_write.c:646 [inline]

__x64_sys_write+0x93/0xd0 fs/read_write.c:646

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+0x13d/0x4a0 net/core/skbuff.c:559

__alloc_skb+0x318/0x740 net/core/skbuff.c:650

alloc_skb include/linux/skbuff.h:1286 [inline]

alloc_skb_with_frags+0xc8/0xbd0 net/core/skbuff.c:6313

sock_alloc_send_pskb+0xa80/0xbf0 net/core/sock.c:2795

tun_alloc_skb drivers/net/tun.c:1531 [inline]

tun_get_user+0x23cf/0x6940 drivers/net/tun.c:1846