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KASAN: slab-out-of-bounds Read in tc_setup_flow_action

Status: upstream: reported C repro on 2025/01/04 22:41
Bug presence: origin:lts
[Documentation on labels]
Reported-by: syzbot+04a3bfe287000b1a5529@syzkaller.appspotmail.com
First crash: 189d, last: 3h38m
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/01/06 lts (merge base) a08241812f21 C [report] KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/01/06 upstream (ToT) 9d89551994a4 C Didn't crash
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action 17 C 1096 3h38m 189d 0/2 upstream: reported C repro on 2025/01/04 22:42

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in is_tcf_tunnel_set include/net/tc_act/tc_tunnel_key.h:33 [inline]
BUG: KASAN: slab-out-of-bounds in tc_setup_flow_action+0xb9d/0x3430 net/sched/cls_api.c:3625
Read of size 8 at addr ffff88810c65a1c0 by task syz-executor339/294

CPU: 1 PID: 294 Comm: syz-executor339 Not tainted 5.15.178-syzkaller-00496-g610bd6013c81 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1c0 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_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309
 is_tcf_tunnel_set include/net/tc_act/tc_tunnel_key.h:33 [inline]
 tc_setup_flow_action+0xb9d/0x3430 net/sched/cls_api.c:3625
 mall_replace_hw_filter+0x394/0xc20 net/sched/cls_matchall.c:100
 mall_change+0x56e/0x780 net/sched/cls_matchall.c:235
 tc_new_tfilter+0x151a/0x1c00 net/sched/cls_api.c:2131
 rtnetlink_rcv_msg+0x776/0xc40 net/core/rtnetlink.c:5638
 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2493
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5665
 netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline]
 netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1341
 netlink_sendmsg+0xa0a/0xd20 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2436
 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2490
 __sys_sendmsg net/socket.c:2519 [inline]
 __do_sys_sendmsg net/socket.c:2528 [inline]
 __se_sys_sendmsg+0x19a/0x260 net/socket.c:2526
 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2526
 x64_sys_call+0x16a/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f7e5b5c87a9
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe6d62ff08 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ffe6d6300d8 RCX: 00007f7e5b5c87a9
RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000004
RBP: 00007f7e5b63b610 R08: 0000000000000004 R09: 00007ffe6d6300d8
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe6d6300c8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>

Allocated by task 294:
 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_kmalloc+0xdb/0x110 mm/kasan/common.c:512
 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:521
 kasan_kmalloc include/linux/kasan.h:227 [inline]
 __kmalloc+0x13f/0x2c0 mm/slub.c:4431
 kmalloc include/linux/slab.h:608 [inline]
 kzalloc include/linux/slab.h:733 [inline]
 tcf_idr_create+0x5f/0x780 net/sched/act_api.c:478
 tcf_idr_create_from_flags+0x5f/0x70 net/sched/act_api.c:536
 tcf_gact_init+0x3cd/0x6e0 net/sched/act_gact.c:102
 tcf_action_init_1+0x50f/0x7f0 net/sched/act_api.c:1071
 tcf_action_init+0x306/0x840 net/sched/act_api.c:1130
 tcf_exts_validate+0x236/0x520 net/sched/cls_api.c:3073
 mall_set_parms+0x44/0x4b0 net/sched/cls_matchall.c:171
 mall_change+0x495/0x780 net/sched/cls_matchall.c:229
 tc_new_tfilter+0x151a/0x1c00 net/sched/cls_api.c:2131
 rtnetlink_rcv_msg+0x776/0xc40 net/core/rtnetlink.c:5638
 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2493
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5665
 netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline]
 netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1341
 netlink_sendmsg+0xa0a/0xd20 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2436
 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2490
 __sys_sendmsg net/socket.c:2519 [inline]
 __do_sys_sendmsg net/socket.c:2528 [inline]
 __se_sys_sendmsg+0x19a/0x260 net/socket.c:2526
 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2526
 x64_sys_call+0x16a/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff88810c65a100
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 0 bytes to the right of
 192-byte region [ffff88810c65a100, ffff88810c65a1c0)
The buggy address belongs to the page:
page:ffffea0004319680 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10c65a
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea00042b4000 0000000b0000000b ffff888100042c00
raw: 0000000000000000 0000000080100010 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 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 3718510070, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485
 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5780
 alloc_slab_page mm/slub.c:-1 [inline]
 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:3250 [inline]
 __kmalloc+0x172/0x2c0 mm/slub.c:4427
 kmalloc_array include/linux/slab.h:643 [inline]
 kcalloc include/linux/slab.h:672 [inline]
 security_get_permissions+0x9f/0x370 security/selinux/ss/services.c:3475
 sel_make_perm_files security/selinux/selinuxfs.c:1876 [inline]
 sel_make_class_dir_entries security/selinux/selinuxfs.c:1937 [inline]
 sel_make_classes security/selinux/selinuxfs.c:1968 [inline]
 sel_make_policy_nodes+0x116a/0x1b30 security/selinux/selinuxfs.c:572
 sel_write_load+0x3b0/0x5a0 security/selinux/selinuxfs.c:652
 vfs_write+0x406/0x1110 fs/read_write.c:592
 ksys_write+0x199/0x2c0 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:656
 x64_sys_call+0x2f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88810c65a080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88810c65a100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88810c65a180: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                           ^
 ffff88810c65a200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88810c65a280: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
=======================================================

Crashes (1104):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/04/15 13:25 android13-5.15-lts 610bd6013c81 23b969b7 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/01/05 06:43 android13-5.15-lts af461d0249a8 f3558dbf .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/01/04 22:36 android13-5.15-lts af461d0249a8 f3558dbf .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/13 02:46 android13-5.15-lts 32c443bd6d40 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/13 00:06 android13-5.15-lts 32c443bd6d40 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/12 23:36 android13-5.15-lts 32c443bd6d40 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/12 14:24 android13-5.15-lts 32c443bd6d40 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/12 13:14 android13-5.15-lts 32c443bd6d40 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/12 10:05 android13-5.15-lts 32c443bd6d40 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/12 05:14 android13-5.15-lts 32c443bd6d40 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/11 20:45 android13-5.15-lts 32c443bd6d40 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/11 20:43 android13-5.15-lts 32c443bd6d40 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/11 04:23 android13-5.15-lts 32c443bd6d40 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/11 02:43 android13-5.15-lts 32c443bd6d40 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/11 00:01 android13-5.15-lts 32c443bd6d40 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/10 20:51 android13-5.15-lts 32c443bd6d40 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/10 05:43 android13-5.15-lts 32c443bd6d40 956bd956 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/10 00:22 android13-5.15-lts 32c443bd6d40 f4e5e155 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/09 19:58 android13-5.15-lts 32c443bd6d40 f4e5e155 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/09 14:07 android13-5.15-lts 32c443bd6d40 f4e5e155 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/09 05:06 android13-5.15-lts 32c443bd6d40 4d9fdfa4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/08 16:56 android13-5.15-lts 32c443bd6d40 4d9fdfa4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/08 08:27 android13-5.15-lts 32c443bd6d40 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/06 12:56 android13-5.15-lts 5cf73bface18 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/06 06:06 android13-5.15-lts 5cf73bface18 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/06 00:36 android13-5.15-lts 5cf73bface18 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/05 22:37 android13-5.15-lts 5cf73bface18 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/04 21:45 android13-5.15-lts 5cf73bface18 d869b261 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/04 03:41 android13-5.15-lts 41b0e17cc2ca 76ad128c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/02 16:11 android13-5.15-lts 0d918fa8e88d bc80e4f0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/02 06:58 android13-5.15-lts 0d918fa8e88d bc80e4f0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/01 21:03 android13-5.15-lts 0d918fa8e88d 091a06cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/07/01 17:29 android13-5.15-lts 0d918fa8e88d 091a06cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/06/30 20:09 android13-5.15-lts 0d918fa8e88d 6e83b42d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/06/30 07:39 android13-5.15-lts 0d918fa8e88d fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/06/30 03:09 android13-5.15-lts 0d918fa8e88d fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/06/29 13:59 android13-5.15-lts 0d918fa8e88d fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/06/29 12:59 android13-5.15-lts 0d918fa8e88d fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/06/29 11:39 android13-5.15-lts 0d918fa8e88d fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/06/29 07:32 android13-5.15-lts 0d918fa8e88d fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/06/29 00:58 android13-5.15-lts 0d918fa8e88d fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/06/28 04:58 android13-5.15-lts 0d918fa8e88d fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/06/28 02:09 android13-5.15-lts 0d918fa8e88d fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/06/27 18:00 android13-5.15-lts 0d918fa8e88d 803ce19b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/06/27 16:59 android13-5.15-lts 0d918fa8e88d 803ce19b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/06/26 23:48 android13-5.15-lts 0d918fa8e88d 803ce19b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/01/04 22:20 android13-5.15-lts af461d0249a8 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
* Struck through repros no longer work on HEAD.