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linux-stable/net/dccp
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Eric Dumazet 6af289746a 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
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

CPU: 0 PID: 4995 Comm: syz-executor153 Not tainted 6.6.0-rc1-syzkaller-00014-ga747acc0b752 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023

Fixes: 977ad86c2a ("dccp: Fix out of bounds access in DCCP error handler")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Jann Horn <jannh@google.com>
Reviewed-by: Jann Horn <jannh@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2023-09-18 07:10:31 +01:00
..
ccids dccp: tfrc: fix doc warnings in tfrc_equation.c 2021-06-10 14:08:49 -07:00
Kconfig dccp: Replace HTTP links with HTTPS ones 2020-07-13 11:54:07 -07:00
Makefile
…
ackvec.c net: dccp: Fix most of the kerneldoc warnings 2020-10-30 12:08:54 -07:00
ackvec.h
…
ccid.c net: dccp: Add __printf() markup to fix -Wsuggest-attribute=format 2020-10-30 11:31:46 -07:00
ccid.h net: dccp: Replace zero-length array with flexible-array member 2020-02-28 12:08:37 -08:00
dccp.h net: ioctl: Use kernel memory on protocol ioctl callbacks 2023-06-15 22:33:26 -07:00
diag.c inet_diag: Move the INET_DIAG_REQ_BYTECODE nlattr to cb->data 2020-02-27 18:50:19 -08:00
feat.c dccp: Return the correct errno code 2021-02-06 11:15:28 -08:00
feat.h dccp: Remove unused declaration dccp_feat_initialise_sysctls() 2023-07-27 17:16:26 -07:00
input.c net: dccp: Convert to use the preferred fallthrough macro 2020-08-22 12:38:34 -07:00
ipv4.c dccp: fix dccp_v4_err()/dccp_v6_err() again 2023-09-18 07:10:31 +01:00
ipv6.c dccp: fix dccp_v4_err()/dccp_v6_err() again 2023-09-18 07:10:31 +01:00
ipv6.h ipv6: remove hard coded limitation on ipv6_pinfo 2023-07-24 09:39:31 +01:00
minisocks.c tcp: allocate tcp_death_row outside of struct netns_ipv4 2022-01-26 19:00:31 -08:00
options.c net: dccp: Convert to use the preferred fallthrough macro 2020-08-22 12:38:34 -07:00
output.c dccp: fix data-race around dp->dccps_mss_cache 2023-08-04 18:27:58 -07:00
proto.c dccp: annotate data-races in dccp_poll() 2023-08-18 19:30:24 -07:00
qpolicy.c net: dccp: Fix most of the kerneldoc warnings 2020-10-30 12:08:54 -07:00
sysctl.c
…
timer.c dccp: annotate lockless accesses to sk->sk_err_soft 2023-03-17 08:25:05 +00:00
trace.h net: dccp: Use memset_startat() for TP zeroing 2021-11-19 11:22:49 +00:00