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KASAN: use-after-free Read in __bpf_prog_put | 3 (4) | 2018/01/31 01:52 |
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KASAN: use-after-free Read in __bpf_prog_put | 3 (4) | 2018/01/31 01:52 |
netlink: 3 bytes leftover after parsing attributes in process `syz-executor5'. ================================================================== BUG: KASAN: use-after-free in __bpf_prog_put+0x5e8/0x640 kernel/bpf/syscall.c:944 netlink: 'syz-executor5': attribute type 5 has an invalid length. Read of size 8 at addr ffff8801d3619658 by task syz-executor0/12398 CPU: 1 PID: 12398 Comm: syz-executor0 Not tainted 4.15.0-rc7-mm1+ #53 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report+0x23b/0x360 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __bpf_prog_put+0x5e8/0x640 kernel/bpf/syscall.c:944 bpf_prog_put+0x1a/0x20 kernel/bpf/syscall.c:961 prog_fd_array_put_ptr+0x15/0x20 kernel/bpf/arraymap.c:446 fd_array_map_delete_elem+0xc8/0x110 kernel/bpf/arraymap.c:420 map_delete_elem kernel/bpf/syscall.c:737 [inline] SYSC_bpf kernel/bpf/syscall.c:1814 [inline] SyS_bpf+0x22ea/0x4400 kernel/bpf/syscall.c:1782 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452ac9 RSP: 002b:00007fb70df60c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9 RDX: 0000000000000010 RSI: 0000000020f02ff0 RDI: 0000000000000003 RBP: 00000000000003aa R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3890 R13: 00000000ffffffff R14: 00007fb70df616d4 R15: 0000000000000000 Allocated by task 11996: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3541 kmem_cache_zalloc include/linux/slab.h:694 [inline] get_empty_filp+0xfb/0x4f0 fs/file_table.c:122 path_openat+0xed/0x3530 fs/namei.c:3514 do_filp_open+0x25b/0x3b0 fs/namei.c:3572 do_sys_open+0x502/0x6d0 fs/open.c:1059 SYSC_open fs/open.c:1077 [inline] SyS_open+0x2d/0x40 fs/open.c:1072 entry_SYSCALL_64_fastpath+0x29/0xa0 Freed by task 11994: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527 __cache_free mm/slab.c:3485 [inline] kmem_cache_free+0x86/0x2b0 mm/slab.c:3743 file_free_rcu+0x5c/0x70 fs/file_table.c:49 __rcu_reclaim kernel/rcu/rcu.h:172 [inline] rcu_do_batch kernel/rcu/tree.c:2675 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2934 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2901 [inline] rcu_process_callbacks+0xd6c/0x17f0 kernel/rcu/tree.c:2918 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285 The buggy address belongs to the object at ffff8801d36195c0 which belongs to the cache filp of size 456 The buggy address is located 152 bytes inside of 456-byte region [ffff8801d36195c0, ffff8801d3619788) The buggy address belongs to the page: page:ffffea00074d8640 count:1 mapcount:0 mapping:ffff8801d36190c0 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801d36190c0 0000000000000000 0000000100000006 raw: ffffea00074c49a0 ffffea000747a160 ffff8801dae30180 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d3619500: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801d3619580: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff8801d3619600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801d3619680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d3619700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
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2018/01/11 10:02 | mmots | 4147d50978df | 02a19b64 | .config | console log | report | ci-upstream-mmots-kasan-gce |