KASAN: use-after-free Write in tcindex_set

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.14	KASAN: use-after-free Write in tcindex_set_parms	C		done	3	1489d	1490d	1/1	fixed on 2020/04/18 14:50
upstream	KASAN: use-after-free Write in tcindex_set_parms net	C	done		13	1478d	1497d	15/26	fixed on 2020/05/10 10:42

audit: type=1400 audit(1583984978.463:38): avc: denied { write } for pid=8174 comm="syz-executor469" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 ================================================================== audit: type=1400 audit(1583984978.463:39): avc: denied { read } for pid=8174 comm="syz-executor469" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 BUG: KASAN: use-after-free in tcindex_set_parms+0x17d0/0x19d0 net/sched/cls_tcindex.c:455 Write of size 16 at addr ffff8880a7b8cb30 by task syz-executor469/8174 CPU: 0 PID: 8174 Comm: syz-executor469 Not tainted 4.19.109-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 print_address_description.cold+0x7c/0x212 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x88/0x2b9 mm/kasan/report.c:396 tcindex_set_parms+0x17d0/0x19d0 net/sched/cls_tcindex.c:455 tcindex_change+0x200/0x2d3 net/sched/cls_tcindex.c:517 tc_new_tfilter+0xa6b/0x1450 net/sched/cls_api.c:1320 rtnetlink_rcv_msg+0x453/0xaf0 net/core/rtnetlink.c:4777 netlink_rcv_skb+0x160/0x410 net/netlink/af_netlink.c:2455 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x4d7/0x6a0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x80b/0xcd0 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:632 ___sys_sendmsg+0x803/0x920 net/socket.c:2115 __sys_sendmsg+0xec/0x1b0 net/socket.c:2153 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x442799 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 5b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffee099d978 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ffee099d9b0 RCX: 0000000000442799 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000020003 R09: 0000000000020003 R10: 0000000000020003 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000004 R14: 00007ffee099da60 R15: 0000000000000000 Allocated by task 1: set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:531 kmem_cache_alloc_trace+0x14d/0x7a0 mm/slab.c:3625 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] call_usermodehelper_setup+0x77/0x2f0 kernel/umh.c:381 kobject_uevent_env+0xc92/0x1160 lib/kobject_uevent.c:611 tty_register_device_attr+0x46e/0x6f0 drivers/tty/tty_io.c:3020 tty_register_device drivers/tty/tty_io.c:2933 [inline] tty_register_driver+0x42d/0x800 drivers/tty/tty_io.c:3204 vty_init+0x3ac/0x3e7 drivers/tty/vt/vt.c:3437 tty_init+0x187/0x18b drivers/tty/tty_io.c:3363 chr_dev_init+0x141/0x151 drivers/char/mem.c:965 do_one_initcall+0xf1/0x734 init/main.c:883 do_initcall_level init/main.c:951 [inline] do_initcalls init/main.c:959 [inline] do_basic_setup init/main.c:977 [inline] kernel_init_freeable+0x4c9/0x5bb init/main.c:1144 kernel_init+0xd/0x1c0 init/main.c:1061 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Freed by task 1310: set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/kasan.c:521 __cache_free mm/slab.c:3503 [inline] kfree+0xce/0x220 mm/slab.c:3822 call_usermodehelper_freeinfo kernel/umh.c:45 [inline] umh_complete kernel/umh.c:59 [inline] umh_complete+0x81/0x90 kernel/umh.c:48 call_usermodehelper_exec_async+0x542/0x630 kernel/umh.c:117 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 The buggy address belongs to the object at ffff8880a7b8cb00 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 48 bytes inside of 192-byte region [ffff8880a7b8cb00, ffff8880a7b8cbc0) The buggy address belongs to the page: page:ffffea00029ee300 count:1 mapcount:0 mapping:ffff88812c3dc040 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffffea000296e148 ffffea0002975448 ffff88812c3dc040 raw: 0000000000000000 ffff8880a7b8c000 0000000100000010 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a7b8ca00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a7b8ca80: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880a7b8cb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a7b8cb80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880a7b8cc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================

Crashes (3):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Manager
2020/03/12 03:52	linux-4.19.y	569209711609	d850e9d0	.config	console log	report	syz	C	ci2-linux-4-19
2020/03/08 09:29	linux-4.19.y	7472c4028e23	2e9971bb	.config	console log	report	syz	C	ci2-linux-4-19
2020/03/11 07:35	linux-4.19.y	7472c4028e23	35f53e45	.config	console log	report	syz		ci2-linux-4-19

Crashes (3):

Assets (help?)