KASAN: use-after-free Read in unix_stream_read

Date	Name	Commit	Repro	Result
2023/11/11	lts (merge base)	12952a23a5da	C	[report] KASAN: use-after-free Read in unix_stream_read_actor
2023/11/11	upstream (ToT)	3ca112b71f35	C	[report] KASAN: slab-use-after-free Read in __skb_datagram_iter
2023/12/26	upstream (ToT)	fbafc3e621c3	C	Didn't crash

Date

Name

Commit

Repro

Result

2023/11/11

lts (merge base)

12952a23a5da

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

2023/11/11

upstream (ToT)

3ca112b71f35

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

2023/12/26

upstream (ToT)

fbafc3e621c3

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	98d	172d	0/2	upstream: reported C repro on 2023/11/11 01:48
linux-5.15	KASAN: use-after-free Read in unix_stream_read_actor origin:lts-only	C		done	1	170d	172d	3/3	fixed on 2023/12/13 18:20
linux-6.1	KASAN: use-after-free Read in unix_stream_read_actor origin:lts-only	C		done	1	168d	172d	3/3	fixed on 2023/12/18 16:47
upstream	KASAN: slab-use-after-free Read in unix_stream_read_actor net	C	error		6	156d	172d	25/26	fixed on 2024/01/20 21:18

Created	Duration	User	Patch	Repo	Result
2023/11/25 03:47	11m	retest repro		android13-5.15-lts	report log

Created

Duration

User

Patch

Repo

Result

2023/11/25 03:47

11m

retest repro

android13-5.15-lts

report log

================================================================== BUG: KASAN: use-after-free in unix_stream_read_actor+0xa3/0xb0 net/unix/af_unix.c:2809 Read of size 4 at addr ffff88811ed1ce04 by task syz-executor396/943 CPU: 0 PID: 943 Comm: syz-executor396 Not tainted 5.15.137-syzkaller-01792-g61cfd264993d #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+0x151/0x1b7 lib/dump_stack.c:106 print_address_description+0x87/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:444 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 unix_stream_read_actor+0xa3/0xb0 net/unix/af_unix.c:2809 unix_stream_recv_urg+0x1b4/0x2f0 net/unix/af_unix.c:2535 unix_stream_read_generic+0x2147/0x2240 net/unix/af_unix.c:2615 unix_stream_recvmsg+0x22d/0x2c0 net/unix/af_unix.c:2847 ____sys_recvmsg+0x286/0x530 ___sys_recvmsg+0x1ec/0x690 net/socket.c:2690 __sys_recvmsg net/socket.c:2720 [inline] __do_sys_recvmsg net/socket.c:2730 [inline] __se_sys_recvmsg net/socket.c:2727 [inline] __x64_sys_recvmsg+0x1dc/0x2b0 net/socket.c:2727 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+0x61/0xcb RIP: 0033:0x7f01363844e9 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:00007f0136303228 EFLAGS: 00000246 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 0000000000000028 RCX: 00007f01363844e9 RDX: 0000000040010083 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 00007f013640e348 R08: 00007f01363036c0 R09: 00007f01363036c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f013640e340 R13: 00007f013640e34c R14: 00007ffca2664350 R15: 00007ffca2664438 </TASK> Allocated by task 942: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] __kasan_slab_alloc+0xb1/0xe0 mm/kasan/common.c:466 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550 slab_alloc_node mm/slub.c:3240 [inline] slab_alloc mm/slub.c:3248 [inline] kmem_cache_alloc+0xf5/0x200 mm/slub.c:3253 kmem_cache_alloc_node include/linux/slab.h:474 [inline] __alloc_skb+0xbe/0x550 net/core/skbuff.c:416 alloc_skb include/linux/skbuff.h:1183 [inline] alloc_skb_with_frags+0xa6/0x680 net/core/skbuff.c:6156 sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2518 sock_alloc_send_skb+0x32/0x40 net/core/sock.c:2535 queue_oob+0xfd/0x8c0 net/unix/af_unix.c:1980 unix_stream_sendmsg+0xe06/0x1060 net/unix/af_unix.c:2117 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2429 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2483 __sys_sendmsg net/socket.c:2512 [inline] __do_sys_sendmsg net/socket.c:2521 [inline] __se_sys_sendmsg+0x19a/0x260 net/socket.c:2519 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2519 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+0x61/0xcb Freed by task 942: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749 slab_free mm/slub.c:3519 [inline] kmem_cache_free+0x116/0x2e0 mm/slub.c:3535 kfree_skbmem+0x104/0x170 __kfree_skb net/core/skbuff.c:758 [inline] consume_skb+0xb4/0x250 net/core/skbuff.c:930 queue_oob+0x522/0x8c0 net/unix/af_unix.c:2011 unix_stream_sendmsg+0xe06/0x1060 net/unix/af_unix.c:2117 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2429 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2483 __sys_sendmsg net/socket.c:2512 [inline] __do_sys_sendmsg net/socket.c:2521 [inline] __se_sys_sendmsg+0x19a/0x260 net/socket.c:2519 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2519 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+0x61/0xcb The buggy address belongs to the object at ffff88811ed1cdc0 which belongs to the cache skbuff_head_cache of size 248 The buggy address is located 68 bytes inside of 248-byte region [ffff88811ed1cdc0, ffff88811ed1ceb8) The buggy address belongs to the page: page:ffffea00047b4700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11ed1c flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 0000000000000000 dead000000000122 ffff888100351b00 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 938, ts 42766038655, free_ts 42713201046 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2602 prep_new_page+0x1b/0x110 mm/page_alloc.c:2608 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4482 __alloc_pages+0x206/0x5e0 mm/page_alloc.c:5773 allocate_slab mm/slub.c:1932 [inline] new_slab+0x9a/0x4e0 mm/slub.c:1995 ___slab_alloc+0x39e/0x830 mm/slub.c:3028 __slab_alloc+0x4a/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3248 [inline] kmem_cache_alloc+0x134/0x200 mm/slub.c:3253 kmem_cache_alloc_node include/linux/slab.h:474 [inline] __alloc_skb+0xbe/0x550 net/core/skbuff.c:416 alloc_skb include/linux/skbuff.h:1183 [inline] alloc_skb_with_frags+0xa6/0x680 net/core/skbuff.c:6156 sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2518 sock_alloc_send_skb+0x32/0x40 net/core/sock.c:2535 queue_oob+0xfd/0x8c0 net/unix/af_unix.c:1980 unix_stream_sendmsg+0xe06/0x1060 net/unix/af_unix.c:2117 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2429 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2483 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1469 [inline] free_pcp_prepare mm/page_alloc.c:1541 [inline] free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3531 free_unref_page+0xe6/0x730 mm/page_alloc.c:3613 free_the_page mm/page_alloc.c:802 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:5849 free_pages+0x7c/0x90 mm/page_alloc.c:5860 tlb_batch_list_free mm/mmu_gather.c:61 [inline] tlb_finish_mmu+0x253/0x320 mm/mmu_gather.c:341 exit_mmap+0x3ef/0x6f0 mm/mmap.c:3211 __mmput+0x95/0x310 kernel/fork.c:1179 mmput+0x5b/0x170 kernel/fork.c:1202 exit_mm kernel/exit.c:551 [inline] do_exit+0xbb4/0x2b60 kernel/exit.c:862 do_group_exit+0x141/0x310 kernel/exit.c:997 get_signal+0x7a3/0x1630 kernel/signal.c:2891 arch_do_signal_or_restart+0xbd/0x1680 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop+0xa0/0xe0 kernel/entry/common.c:172 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:301 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 Memory state around the buggy address: ffff88811ed1cd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc ffff88811ed1cd80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff88811ed1ce00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811ed1ce80: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc ffff88811ed1cf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2023/11/11 03:42	android13-5.15-lts	61cfd264993d	d80eec66	.config	console log	report	syz	C			ci2-android-5-15-perf	KASAN: use-after-free Read in unix_stream_read_actor

Crashes (1):

Assets (help?)