In the Linux kernel, the following vulnerability has been resolved:
kcm: Serialise kcm_sendmsg() for the same socket.
syzkaller reported UAF in kcm_release(). [0]
The scenario is
Thread A builds a skb with MSGMORE and sets kcm->seqskb.
Thread A resumes building skb from kcm->seqskb but is blocked by skstreamwaitmemory()
Thread B calls sendmsg() concurrently, finishes building kcm->seq_skb and puts the skb to the write queue
Thread A faces an error and finally frees skb that is already in the write queue
kcm_release() does double-free the skb in the write queue
When a thread is building a MSG_MORE skb, another thread must not touch it.
Let's add a per-sk mutex and serialise kcm_sendmsg().
BUG: KASAN: slab-use-after-free in _skbdequeue include/linux/skbuff.h:2385 [inline] BUG: KASAN: slab-use-after-free in _skbqueuepurgereason include/linux/skbuff.h:3175 [inline] BUG: KASAN: slab-use-after-free in _skbqueuepurge include/linux/skbuff.h:3181 [inline] BUG: KASAN: slab-use-after-free in kcmrelease+0x170/0x4c8 net/kcm/kcmsock.c:1691 Read of size 8 at addr ffff0000ced0fc80 by task syz-executor329/6167
CPU: 1 PID: 6167 Comm: syz-executor329 Tainted: G B 6.8.0-rc5-syzkaller-g9abbc24128bc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call trace: dumpbacktrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291 showstack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298 dumpstack lib/dumpstack.c:88 [inline] dumpstacklvl+0xd0/0x124 lib/dumpstack.c:106 printaddressdescription mm/kasan/report.c:377 [inline] printreport+0x178/0x518 mm/kasan/report.c:488 kasanreport+0xd8/0x138 mm/kasan/report.c:601 _asanreportload8noabort+0x20/0x2c mm/kasan/reportgeneric.c:381 _skbunlink include/linux/skbuff.h:2366 [inline] _skbdequeue include/linux/skbuff.h:2385 [inline] _skbqueuepurgereason include/linux/skbuff.h:3175 [inline] _skbqueuepurge include/linux/skbuff.h:3181 [inline] kcmrelease+0x170/0x4c8 net/kcm/kcmsock.c:1691 _sockrelease net/socket.c:659 [inline] sockclose+0xa4/0x1e8 net/socket.c:1421 _fput+0x30c/0x738 fs/filetable.c:376 _fput+0x20/0x30 fs/filetable.c:404 taskworkrun+0x230/0x2e0 kernel/taskwork.c:180 exittaskwork include/linux/taskwork.h:38 [inline] doexit+0x618/0x1f64 kernel/exit.c:871 dogroupexit+0x194/0x22c kernel/exit.c:1020 getsignal+0x1500/0x15ec kernel/signal.c:2893 dosignal+0x23c/0x3b44 arch/arm64/kernel/signal.c:1249 donotifyresume+0x74/0x1f4 arch/arm64/kernel/entry-common.c:148 exittousermodeprepare arch/arm64/kernel/entry-common.c:169 [inline] exittousermode arch/arm64/kernel/entry-common.c:178 [inline] el0svc+0xac/0x168 arch/arm64/kernel/entry-common.c:713 el0t64synchandler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
Allocated by task 6166: kasansavestack mm/kasan/common.c:47 [inline] kasansavetrack+0x40/0x78 mm/kasan/common.c:68 kasansaveallocinfo+0x70/0x84 mm/kasan/generic.c:626 unpoisonslabobject mm/kasan/common.c:314 [inline] _kasanslaballoc+0x74/0x8c mm/kasan/common.c:340 kasanslaballoc include/linux/kasan.h:201 [inline] slabpostallochook mm/slub.c:3813 [inline] slaballocnode mm/slub.c:3860 [inline] kmemcacheallocnode+0x204/0x4c0 mm/slub.c:3903 _allocskb+0x19c/0x3d8 net/core/skbuff.c:641 allocskb include/linux/skbuff.h:1296 [inline] kcmsendmsg+0x1d3c/0x2124 net/kcm/kcmsock.c:783 socksendmsgnosec net/socket.c:730 [inline] _socksendmsg net/socket.c:745 [inline] socksendmsg+0x220/0x2c0 net/socket.c:768 splicetosocket+0x7cc/0xd58 fs/splice.c:889 dosplicefrom fs/splice.c:941 [inline] directspliceactor+0xec/0x1d8 fs/splice.c:1164 splicedirecttoactor+0x438/0xa0c fs/splice.c:1108 dosplicedirect_actor ---truncated---
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