+syzkal...@googlegroups.com
On Sat, Dec 3, 2016 at 1:56 PM, Andrey Konovalov <andreyk...@google.com> wrote: > Hi! > > I'm seeing lots of the following error reports while running the > syzkaller fuzzer. > > Reports appeared when I updated to 3c49de52 (Dec 2) from 2caceb32 (Dec 1). > > ================================================================== > BUG: KASAN: use-after-free in worker_thread+0x17d8/0x18a0 > Read of size 8 at addr ffff880067f3ecd8 by task kworker/3:1/774 > > page:ffffea00019fce00 count:1 mapcount:0 mapping: (null) > index:0xffff880067f39c10 compound_mapcount: 0 > flags: 0x500000000004080(slab|head) > page dumped because: kasan: bad access detected > > CPU: 3 PID: 774 Comm: kworker/3:1 Not tainted 4.9.0-rc7+ #66 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > ffff88006c267838 ffffffff81f882da ffffffff6c25e338 1ffff1000d84ce9a > ffffed000d84ce92 ffff88006c25e340 0000000041b58ab3 ffffffff8541e198 > ffffffff81f88048 0000000100000000 0000000041b58ab3 ffffffff853d3ee8 > Call Trace: > [< inline >] __dump_stack lib/dump_stack.c:15 > [<ffffffff81f882da>] dump_stack+0x292/0x398 lib/dump_stack.c:51 > [< inline >] describe_address mm/kasan/report.c:262 > [<ffffffff817e50d1>] kasan_report_error+0x121/0x560 mm/kasan/report.c:368 > [< inline >] kasan_report mm/kasan/report.c:390 > [<ffffffff817e560e>] __asan_report_load8_noabort+0x3e/0x40 > mm/kasan/report.c:411 > [<ffffffff81329b88>] worker_thread+0x17d8/0x18a0 kernel/workqueue.c:2228 > [<ffffffff8133ebf3>] kthread+0x323/0x3e0 kernel/kthread.c:209 > [<ffffffff84a2a22a>] ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:433 > > The buggy address belongs to the object at ffff880067f3e6d0 > which belongs to the cache kmalloc-2048 of size 2048 > The buggy address ffff880067f3ecd8 is located 1544 bytes inside > of 2048-byte region [ffff880067f3e6d0, ffff880067f3eed0) > > Freed by task 0: > [<ffffffff81203526>] save_stack_trace+0x16/0x20 > arch/x86/kernel/stacktrace.c:57 > [<ffffffff817e4173>] save_stack+0x43/0xd0 mm/kasan/kasan.c:495 > [< inline >] set_track mm/kasan/kasan.c:507 > [<ffffffff817e4a53>] kasan_slab_free+0x73/0xc0 mm/kasan/kasan.c:571 > [< inline >] slab_free_hook mm/slub.c:1352 > [< inline >] slab_free_freelist_hook mm/slub.c:1374 > [< inline >] slab_free mm/slub.c:2951 > [<ffffffff817e0eb7>] kfree+0xe7/0x2b0 mm/slub.c:3871 > [< inline >] sk_prot_free net/core/sock.c:1372 > [<ffffffff831ea1c7>] __sk_destruct+0x5c7/0x6e0 net/core/sock.c:1445 > [<ffffffff831f3517>] sk_destruct+0x47/0x80 net/core/sock.c:1453 > [<ffffffff831f35a7>] __sk_free+0x57/0x230 net/core/sock.c:1461 > [<ffffffff831f37a3>] sk_free+0x23/0x30 net/core/sock.c:1472 > [< inline >] sock_put include/net/sock.h:1591 > [<ffffffff8348ca9c>] deferred_put_nlk_sk+0x2c/0x40 > net/netlink/af_netlink.c:671 > [< inline >] __rcu_reclaim kernel/rcu/rcu.h:118 > [<ffffffff8146d42f>] rcu_do_batch.isra.67+0x8ff/0xc50 kernel/rcu/tree.c:2776 > [< inline >] invoke_rcu_callbacks kernel/rcu/tree.c:3040 > [< inline >] __rcu_process_callbacks kernel/rcu/tree.c:3007 > [<ffffffff8146e097>] rcu_process_callbacks+0x2b7/0xba0 kernel/rcu/tree.c:3024 > [<ffffffff84a2d08b>] __do_softirq+0x2fb/0xb63 kernel/softirq.c:284 > > Allocated by task 10748: > [<ffffffff81203526>] save_stack_trace+0x16/0x20 > arch/x86/kernel/stacktrace.c:57 > [<ffffffff817e4173>] save_stack+0x43/0xd0 mm/kasan/kasan.c:495 > [< inline >] set_track mm/kasan/kasan.c:507 > [<ffffffff817e43fd>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:598 > [<ffffffff817e0050>] __kmalloc+0xa0/0x2d0 mm/slub.c:3734 > [< inline >] kmalloc include/linux/slab.h:495 > [<ffffffff831e4c01>] sk_prot_alloc+0x101/0x2a0 net/core/sock.c:1333 > [<ffffffff831efd15>] sk_alloc+0x105/0x1000 net/core/sock.c:1389 > [<ffffffff8348ad46>] __netlink_create+0x66/0x1d0 net/netlink/af_netlink.c:588 > [<ffffffff8348cdab>] netlink_create+0x2fb/0x500 net/netlink/af_netlink.c:647 > [<ffffffff831dd1d6>] __sock_create+0x4f6/0x880 net/socket.c:1168 > [< inline >] sock_create net/socket.c:1208 > [< inline >] SYSC_socket net/socket.c:1238 > [<ffffffff831dd799>] SyS_socket+0xf9/0x230 net/socket.c:1218 > [<ffffffff84a29fc1>] entry_SYSCALL_64_fastpath+0x1f/0xc2 > > Memory state around the buggy address: > ffff880067f3eb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff880067f3ec00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >>ffff880067f3ec80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff880067f3ed00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff880067f3ed80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ==================================================================
