KASAN: use-after-free Read in unix_stream_read

Date	Name	Commit	Repro	Result
2023/11/11	linux-6.1.y (ToT)	fb2635ac69ab	C	[report] KASAN: use-after-free Read in __skb_datagram_iter
2023/11/11	upstream (ToT)	3ca112b71f35	C	Didn't crash

Date

Name

Commit

Repro

Result

2023/11/11

linux-6.1.y (ToT)

fb2635ac69ab

[report] KASAN: use-after-free Read in __skb_datagram_iter

2023/11/11

upstream (ToT)

3ca112b71f35

Didn't crash

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
android-6-1	KASAN: use-after-free Read in unix_stream_read_actor missing-backport origin:upstream	C	done	done	2	103d	178d	0/2	auto-obsoleted due to no activity on 2024/05/03 09:45
linux-5.15	KASAN: use-after-free Read in unix_stream_read_actor origin:lts-only	C		done	1	176d	177d	3/3	fixed on 2023/12/13 18:20
android-5-15	KASAN: use-after-free Read in unix_stream_read_actor origin:upstream	C			1	177d	177d	0/2	auto-obsoleted due to no activity on 2024/02/19 03:43
upstream	KASAN: slab-use-after-free Read in unix_stream_read_actor net	C	error		6	161d	177d	25/26	fixed on 2024/01/20 21:18

Created	Duration	User	Patch	Repo	Result
2023/12/15 07:47	3h51m	bisect fix		linux-6.1.y	job log (1)
2023/11/15 04:46	2h19m	fix candidate		upstream	job log (0) log

Created

Duration

User

Patch

Repo

Result

2023/12/15 07:47

3h51m

bisect fix

linux-6.1.y

job log (1)

2023/11/15 04:46

2h19m

fix candidate

upstream

job log (0) log

================================================================== BUG: KASAN: use-after-free in unix_stream_read_actor+0x9e/0xa0 net/unix/af_unix.c:2920 Read of size 4 at addr ffff888078cd9184 by task syz-executor293/4250 CPU: 0 PID: 4250 Comm: syz-executor293 Not tainted 6.1.62-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:395 kasan_report+0x136/0x160 mm/kasan/report.c:495 unix_stream_read_actor+0x9e/0xa0 net/unix/af_unix.c:2920 unix_stream_recv_urg+0x1bb/0x300 net/unix/af_unix.c:2647 unix_stream_read_generic+0x2104/0x21e0 net/unix/af_unix.c:2726 unix_stream_recvmsg+0x222/0x2b0 net/unix/af_unix.c:2957 ____sys_recvmsg+0x285/0x530 ___sys_recvmsg net/socket.c:2760 [inline] __sys_recvmsg+0x2e9/0x3d0 net/socket.c:2790 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4e215024e9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4e21481228 EFLAGS: 00000246 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 0000000000000024 RCX: 00007f4e215024e9 RDX: 0000000040010083 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 00007f4e2158c348 R08: 00007f4e214816c0 R09: 00007f4e214816c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4e2158c340 R13: 00007f4e2158c34c R14: 00007fff157e2d70 R15: 00007fff157e2e58 </TASK> Allocated by task 4249: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] kmem_cache_alloc_node+0x136/0x310 mm/slub.c:3443 __alloc_skb+0xde/0x670 net/core/skbuff.c:505 alloc_skb include/linux/skbuff.h:1276 [inline] alloc_skb_with_frags+0xa4/0x740 net/core/skbuff.c:6153 sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2738 sock_alloc_send_skb include/net/sock.h:1907 [inline] queue_oob+0x102/0x8e0 net/unix/af_unix.c:2114 unix_stream_sendmsg+0xe10/0x1070 net/unix/af_unix.c:2251 sock_sendmsg_nosec net/socket.c:716 [inline] __sock_sendmsg net/socket.c:728 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2499 ___sys_sendmsg net/socket.c:2553 [inline] __sys_sendmsg+0x2a9/0x390 net/socket.c:2582 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 4249: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] kmem_cache_free+0x292/0x510 mm/slub.c:3683 queue_oob+0x52c/0x8e0 net/unix/af_unix.c:2145 unix_stream_sendmsg+0xe10/0x1070 net/unix/af_unix.c:2251 sock_sendmsg_nosec net/socket.c:716 [inline] __sock_sendmsg net/socket.c:728 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2499 ___sys_sendmsg net/socket.c:2553 [inline] __sys_sendmsg+0x2a9/0x390 net/socket.c:2582 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888078cd9140 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 68 bytes inside of 240-byte region [ffff888078cd9140, ffff888078cd9230) The buggy address belongs to the physical page: page:ffffea0001e33640 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x78cd9 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000122 ffff888141e54500 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 4249, tgid 4247 (syz-executor293), ts 70820582570, free_ts 70763899994 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513 prep_new_page mm/page_alloc.c:2520 [inline] get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5545 alloc_slab_page+0x6a/0x150 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] kmem_cache_alloc_node+0x1cf/0x310 mm/slub.c:3443 __alloc_skb+0xde/0x670 net/core/skbuff.c:505 alloc_skb include/linux/skbuff.h:1276 [inline] alloc_skb_with_frags+0xa4/0x740 net/core/skbuff.c:6153 sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2738 sock_alloc_send_skb include/net/sock.h:1907 [inline] queue_oob+0x102/0x8e0 net/unix/af_unix.c:2114 unix_stream_sendmsg+0xe10/0x1070 net/unix/af_unix.c:2251 sock_sendmsg_nosec net/socket.c:716 [inline] __sock_sendmsg net/socket.c:728 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2499 ___sys_sendmsg net/socket.c:2553 [inline] __sys_sendmsg+0x2a9/0x390 net/socket.c:2582 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1440 [inline] free_pcp_prepare mm/page_alloc.c:1490 [inline] free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3358 free_unref_page_list+0x663/0x900 mm/page_alloc.c:3499 release_pages+0x2836/0x2b40 mm/swap.c:1055 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline] tlb_flush_mmu_free mm/mmu_gather.c:254 [inline] tlb_flush_mmu+0xfc/0x210 mm/mmu_gather.c:261 tlb_finish_mmu+0xce/0x1f0 mm/mmu_gather.c:361 exit_mmap+0x3c3/0x9f0 mm/mmap.c:3239 __mmput+0x115/0x3c0 kernel/fork.c:1199 exit_mm+0x226/0x300 kernel/exit.c:563 do_exit+0x9f6/0x26a0 kernel/exit.c:856 do_group_exit+0x202/0x2b0 kernel/exit.c:1019 get_signal+0x16f7/0x17d0 kernel/signal.c:2862 arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 Memory state around the buggy address: ffff888078cd9080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ffff888078cd9100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff888078cd9180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888078cd9200: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc ffff888078cd9280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2023/11/11 07:38	linux-6.1.y	fb2635ac69ab	d80eec66	.config	console log	report	syz	C			ci2-linux-6-1-kasan-perf	KASAN: use-after-free Read in unix_stream_read_actor

Crashes (1):

Assets (help?)