Messages in this thread | | | From | Palash Oswal <> | Date | Wed, 12 Apr 2023 21:38:14 -0700 | Subject | KASAN: slab-out-of-bounds Read in taprio_dequeue_from_txq |
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Hello, I found the following issue using syzkaller with enriched corpus on: HEAD commit : 0bcc4025550403ae28d2984bddacafbca0a2f112 git tree: linux
C Reproducer : I do not have a C reproducer yet. I will update this thread when I get one. Kernel .config : https://gist.github.com/oswalpalash/d9580b0bfce202b37445fa5fd426e41f
Console log : ================================================================== BUG: KASAN: slab-out-of-bounds in taprio_dequeue_from_txq+0x7e3/0x8e0 Read of size 8 at addr ffff888110ad3380 by task syz-executor.1/18757
CPU: 1 PID: 18757 Comm: syz-executor.1 Not tainted 6.3.0-rc6-pasta-00035-g0bcc40255504 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Call Trace: <IRQ> dump_stack_lvl+0xd9/0x150 print_address_description.constprop.0+0x2c/0x3c0 kasan_report+0x11c/0x130 taprio_dequeue_from_txq+0x7e3/0x8e0 taprio_dequeue_tc_priority+0x272/0x440 taprio_dequeue+0x12c/0x5e0 __qdisc_run+0x1b2/0x1620 net_tx_action+0x6e3/0xc20 __do_softirq+0x1d4/0x905 __irq_exit_rcu+0x114/0x190 irq_exit_rcu+0x9/0x20 sysvec_apic_timer_interrupt+0x97/0xc0 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:__sanitizer_cov_trace_pc+0xb/0x70 Code: 0f 1e fa 48 8b be a8 01 00 00 e8 b0 ff ff ff 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 65 8b 05 fd c2 81 7e <89> c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 c0 b8 03 00 a9 RSP: 0018:ffffc9000308fbf0 EFLAGS: 00000246 RAX: 0000000080000000 RBX: 000000000080ce08 RCX: ffffffff81713a44 RDX: ffff88811187e340 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffff888135c2b880 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffc9000308fd98 R14: dffffc0000000000 R15: ffff88811187e340 hrtimer_active+0xda/0x1f0 hrtimer_try_to_cancel+0x25/0x4b0 do_nanosleep+0x161/0x4f0 hrtimer_nanosleep+0x19b/0x430 common_nsleep+0xa6/0xd0 __x64_sys_clock_nanosleep+0x32e/0x480 do_syscall_64+0x39/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f5750abbe1f Code: 44 00 00 b8 16 00 00 00 eb b2 90 89 7c 24 08 e8 77 e1 ff ff 8b 7c 24 08 4d 89 ea 4c 89 e2 41 89 c0 89 ee b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 44 24 08 e8 b4 e1 ff ff 48 8b 44 24 08 e9 5e ff ff RSP: 002b:00007ffc798ee300 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6 RAX: ffffffffffffffda RBX: 0000000000000e01 RCX: 00007f5750abbe1f RDX: 00007ffc798ee380 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffc79957080 R10: 0000000000000000 R11: 0000000000000293 R12: 00007ffc798ee380 R13: 0000000000000000 R14: 00007ffc798ee3fc R15: 0000000000000032 </TASK>
Allocated by task 10073: kasan_save_stack+0x22/0x40 kasan_set_track+0x25/0x30 __kasan_kmalloc+0xa3/0xb0 __kmalloc+0x5e/0x190 taprio_init+0x319/0x8c0 qdisc_create+0x4d1/0x1040 tc_modify_qdisc+0x488/0x1a40 rtnetlink_rcv_msg+0x43d/0xd50 netlink_rcv_skb+0x165/0x440 netlink_unicast+0x547/0x7f0 netlink_sendmsg+0x926/0xe30 sock_sendmsg+0xde/0x190 ____sys_sendmsg+0x71c/0x900 ___sys_sendmsg+0x110/0x1b0 __sys_sendmsg+0xf7/0x1c0 do_syscall_64+0x39/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd
The buggy address belongs to the object at ffff888110ad3300 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 0 bytes to the right of allocated 128-byte region [ffff888110ad3300, ffff888110ad3380)
The buggy address belongs to the physical page: page:ffffea000442b4c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x110ad3 flags: 0x57ff00000000200(slab|node=1|zone=2|lastcpupid=0x7ff) raw: 057ff00000000200 ffff888012440400 ffffea0004432050 ffffea0004d34490 raw: 0000000000000000 ffff888110ad3000 0000000100000010 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 0x242020(__GFP_HIGH|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 10056, tgid 10053 (syz-executor.0), ts 1299225545953, free_ts 1297773239495 get_page_from_freelist+0x1190/0x2e20 __alloc_pages+0x1cb/0x4a0 cache_grow_begin+0x9b/0x3b0 cache_alloc_refill+0x27f/0x380 __kmem_cache_alloc_node+0x360/0x3f0 kmalloc_trace+0x26/0xe0 __hw_addr_add_ex+0x22d/0x7f0 dev_addr_init+0x13e/0x220 alloc_netdev_mqs+0x2f8/0x1250 rtnl_create_link+0xbeb/0xee0 __rtnl_newlink+0xfd2/0x1840 rtnl_newlink+0x68/0xa0 rtnetlink_rcv_msg+0x43d/0xd50 netlink_rcv_skb+0x165/0x440 netlink_unicast+0x547/0x7f0 netlink_sendmsg+0x926/0xe30 page last free stack trace: free_pcp_prepare+0x5d5/0xa50 free_unref_page+0x1d/0x490 slabs_destroy+0x85/0xc0 ___cache_free+0x204/0x3d0 qlist_free_all+0x4f/0x1a0 kasan_quarantine_reduce+0x192/0x220 __kasan_slab_alloc+0x63/0x90 kmem_cache_alloc+0x1bd/0x3f0 __alloc_file+0x21/0x270 alloc_empty_file+0x71/0x190 alloc_file+0x5e/0x800 alloc_file_pseudo+0x169/0x250 sock_alloc_file+0x53/0x190 __sys_socket+0x1a8/0x250 __x64_sys_socket+0x73/0xb0 do_syscall_64+0x39/0xb0
Memory state around the buggy address: ffff888110ad3280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888110ad3300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888110ad3380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888110ad3400: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ffff888110ad3480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess): 0: 0f 1e fa nop %edx 3: 48 8b be a8 01 00 00 mov 0x1a8(%rsi),%rdi a: e8 b0 ff ff ff callq 0xffffffbf f: 31 c0 xor %eax,%eax 11: c3 retq 12: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) 19: 00 00 00 00 1d: 66 90 xchg %ax,%ax 1f: f3 0f 1e fa endbr64 23: 65 8b 05 fd c2 81 7e mov %gs:0x7e81c2fd(%rip),%eax # 0x7e81c327 * 2a: 89 c1 mov %eax,%ecx <-- trapping instruction 2c: 48 8b 34 24 mov (%rsp),%rsi 30: 81 e1 00 01 00 00 and $0x100,%ecx 36: 65 48 8b 14 25 c0 b8 mov %gs:0x3b8c0,%rdx 3d: 03 00 3f: a9 .byte 0xa9
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