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

Status: upstream: reported C repro on 2025/01/04 22:42
Reported-by: syzbot+7a1c3b8c6950bb246cfc@syzkaller.appspotmail.com
First crash: 135d, last: 1d03h
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-15 KASAN: slab-out-of-bounds Read in tc_setup_flow_action origin:lts C 702 1d03h 135d 0/2 upstream: reported C repro on 2025/01/04 22:41

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+0xbb8/0x3630 net/sched/cls_api.c:3639
Read of size 8 at addr ffff88810c1c7fc0 by task syz-executor175/291

CPU: 1 PID: 291 Comm: syz-executor175 Not tainted 5.10.234-syzkaller-00033-g094fc3778d6b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:452
 __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+0xbb8/0x3630 net/sched/cls_api.c:3639
 mall_replace_hw_filter+0x394/0xc10 net/sched/cls_matchall.c:100
 mall_change+0x573/0x7a0 net/sched/cls_matchall.c:236
 tc_new_tfilter+0x168e/0x1dc0 net/sched/cls_api.c:2134
 rtnetlink_rcv_msg+0x77a/0xc50 net/core/rtnetlink.c:5598
 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2485
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5625
 netlink_unicast_kernel net/netlink/af_netlink.c:1307 [inline]
 netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1333
 netlink_sendmsg+0xa46/0xd00 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:652 [inline]
 __sock_sendmsg net/socket.c:664 [inline]
 ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2376
 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2430
 __sys_sendmsg net/socket.c:2459 [inline]
 __do_sys_sendmsg net/socket.c:2468 [inline]
 __se_sys_sendmsg+0x1b1/0x280 net/socket.c:2466
 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2466
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:-1
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fa7462d27a9
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:00007fff741f0708 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fff741f08d8 RCX: 00007fa7462d27a9
RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000003
RBP: 00007fa746345610 R08: 0000000000000004 R09: 00007fff741f08d8
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff741f08c8 R14: 0000000000000001 R15: 0000000000000001

Allocated by task 291:
 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:430 [inline]
 ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:509
 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:518
 kasan_kmalloc include/linux/kasan.h:254 [inline]
 __kmalloc+0x1aa/0x330 mm/slub.c:4033
 kmalloc include/linux/slab.h:557 [inline]
 kzalloc include/linux/slab.h:664 [inline]
 tcf_idr_create+0x5f/0x770 net/sched/act_api.c:430
 tcf_idr_create_from_flags+0x5f/0x70 net/sched/act_api.c:488
 tcf_gact_init+0x373/0x6e0 net/sched/act_gact.c:102
 tcf_action_init_1+0x584/0x830 net/sched/act_api.c:1052
 tcf_action_init+0x2b5/0x800 net/sched/act_api.c:1109
 tcf_exts_validate+0x232/0x540 net/sched/cls_api.c:3086
 mall_set_parms+0x4b/0x440 net/sched/cls_matchall.c:171
 mall_change+0x49e/0x7a0 net/sched/cls_matchall.c:230
 tc_new_tfilter+0x168e/0x1dc0 net/sched/cls_api.c:2134
 rtnetlink_rcv_msg+0x77a/0xc50 net/core/rtnetlink.c:5598
 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2485
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5625
 netlink_unicast_kernel net/netlink/af_netlink.c:1307 [inline]
 netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1333
 netlink_sendmsg+0xa46/0xd00 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:652 [inline]
 __sock_sendmsg net/socket.c:664 [inline]
 ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2376
 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2430
 __sys_sendmsg net/socket.c:2459 [inline]
 __do_sys_sendmsg net/socket.c:2468 [inline]
 __se_sys_sendmsg+0x1b1/0x280 net/socket.c:2466
 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2466
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:-1
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

The buggy address belongs to the object at ffff88810c1c7f00
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 0 bytes to the right of
 192-byte region [ffff88810c1c7f00, ffff88810c1c7fc0)
The buggy address belongs to the page:
page:ffffea00043071c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10c1c7
flags: 0x4000000000000200(slab)
raw: 4000000000000200 ffffea00042fb9c0 0000000b0000000b ffff888100043380
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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 64, ts 4863819174, free_ts 4746967728
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x166/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1808 [inline]
 new_slab+0x80/0x400 mm/slub.c:1869
 new_slab_objects mm/slub.c:2627 [inline]
 ___slab_alloc+0x302/0x4b0 mm/slub.c:2791
 __slab_alloc+0x63/0xa0 mm/slub.c:2831
 slab_alloc_node mm/slub.c:2913 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc_trace+0x1bd/0x2e0 mm/slub.c:2972
 kmalloc include/linux/slab.h:552 [inline]
 kzalloc include/linux/slab.h:664 [inline]
 alloc_fs_context+0x64/0x680 fs/fs_context.c:234
 fs_context_for_mount+0x24/0x30 fs/fs_context.c:281
 do_new_mount+0x15c/0xb30 fs/namespace.c:2896
 path_mount+0x56f/0xcb0 fs/namespace.c:3247
 do_mount fs/namespace.c:3260 [inline]
 __do_sys_mount fs/namespace.c:3468 [inline]
 __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3445
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3445
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:-1
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1349 [inline]
 free_pcp_prepare mm/page_alloc.c:1421 [inline]
 free_unref_page_prepare+0x2ae/0x2d0 mm/page_alloc.c:3336
 free_unref_page mm/page_alloc.c:3391 [inline]
 free_the_page+0x9e/0x370 mm/page_alloc.c:5407
 __free_pages+0x67/0xc0 mm/page_alloc.c:5418
 __vunmap+0x7c1/0x940 mm/vmalloc.c:2301
 __vfree mm/vmalloc.c:2350 [inline]
 vfree+0x5c/0x80 mm/vmalloc.c:2381
 sel_write_load+0x247/0x550 security/selinux/selinuxfs.c:668
 vfs_write+0x36a/0xe70 fs/read_write.c:603
 ksys_write+0x199/0x2c0 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:667
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:-1
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Memory state around the buggy address:
 ffff88810c1c7e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88810c1c7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88810c1c7f80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                           ^
 ffff88810c1c8000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88810c1c8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
==================================================================

Crashes (727):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/04/05 17:32 android13-5.10-lts 094fc3778d6b c53ea9c9 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/01/04 22:55 android13-5.10-lts 49e8ba0a684f f3558dbf .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/01/04 22:39 android13-5.10-lts 49e8ba0a684f f3558dbf .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/19 18:16 android13-5.10-lts 7e2543346ff7 b84f0537 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/19 10:17 android13-5.10-lts 7e2543346ff7 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/19 06:54 android13-5.10-lts 7e2543346ff7 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/19 02:08 android13-5.10-lts 7e2543346ff7 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/18 05:32 android13-5.10-lts 7e2543346ff7 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/18 02:22 android13-5.10-lts 7e2543346ff7 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/17 23:31 android13-5.10-lts 7e2543346ff7 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/17 12:52 android13-5.10-lts 7e2543346ff7 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/17 11:01 android13-5.10-lts 7e2543346ff7 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/17 04:26 android13-5.10-lts 7e2543346ff7 f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/16 03:08 android13-5.10-lts 7e2543346ff7 cfde8269 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/15 12:06 android13-5.10-lts 7e2543346ff7 d6b2ee52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/15 08:21 android13-5.10-lts 7e2543346ff7 d6b2ee52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/15 08:21 android13-5.10-lts 7e2543346ff7 d6b2ee52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/15 04:01 android13-5.10-lts 7e2543346ff7 d6b2ee52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/14 11:42 android13-5.10-lts 7e2543346ff7 7344edeb .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/13 11:54 android13-5.10-lts 7e2543346ff7 f6671af7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/13 08:18 android13-5.10-lts 7e2543346ff7 f6671af7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/12 19:08 android13-5.10-lts 7e2543346ff7 f6671af7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/12 00:17 android13-5.10-lts 7e2543346ff7 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/11 21:57 android13-5.10-lts 7e2543346ff7 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/11 14:47 android13-5.10-lts 7e2543346ff7 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/11 04:07 android13-5.10-lts 7e2543346ff7 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/11 02:06 android13-5.10-lts 7e2543346ff7 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/10 19:15 android13-5.10-lts 7e2543346ff7 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/10 00:00 android13-5.10-lts 7e2543346ff7 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/09 19:29 android13-5.10-lts 7e2543346ff7 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/09 16:09 android13-5.10-lts 7e2543346ff7 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/09 06:25 android13-5.10-lts 7e2543346ff7 bb813bcc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/09 04:59 android13-5.10-lts 7e2543346ff7 bb813bcc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/09 02:26 android13-5.10-lts 7e2543346ff7 bb813bcc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/08 20:59 android13-5.10-lts 7e2543346ff7 dbf35fa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/08 16:28 android13-5.10-lts 7e2543346ff7 dbf35fa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/07 20:08 android13-5.10-lts 7e2543346ff7 dbf35fa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/07 15:21 android13-5.10-lts 7e2543346ff7 350f4ffc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/07 06:36 android13-5.10-lts ab07aeb2c93d 350f4ffc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/07 03:26 android13-5.10-lts ab07aeb2c93d 350f4ffc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/06 19:58 android13-5.10-lts ab07aeb2c93d 350f4ffc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/06 03:40 android13-5.10-lts ab07aeb2c93d ae98e6b9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/05 21:14 android13-5.10-lts ab07aeb2c93d 6ca47dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/05 13:44 android13-5.10-lts ab07aeb2c93d 6ca47dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/05 05:46 android13-5.10-lts ab07aeb2c93d b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/05 04:36 android13-5.10-lts ab07aeb2c93d b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/05 01:26 android13-5.10-lts ab07aeb2c93d b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/05/02 14:09 android13-5.10-lts ab07aeb2c93d d7f099d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
2025/01/04 22:20 android13-5.10-lts 49e8ba0a684f f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: slab-out-of-bounds Read in tc_setup_flow_action
* Struck through repros no longer work on HEAD.