INIT: Entering runlevel: 2 [[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-android-49-kasan-gce-5,10.128.0.32' (ECDSA) to the list of known hosts. 2017/08/12 17:14:01 parsed 1 programs 2017/08/12 17:14:01 executed programs: 0 syzkaller login: [ 30.058796] ================================================================== [ 30.060161] BUG: KASAN: use-after-free in bio_copy_user_iov+0xe61/0xea0 at addr ffff8801c8a21b40 [ 30.061505] Read of size 8 by task syz-executor6/3403 [ 30.062226] CPU: 1 PID: 3403 Comm: syz-executor6 Not tainted 4.9.42-g02f29ab #24 [ 30.063429] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.065060] ffff8801c6e874c0 ffffffff81d92909 ffff8801da0013c0 ffff8801c8a21b40 [ 30.066412] ffff8801c8a21c40 ffffed0039144368 ffff8801c8a21b40 ffff8801c6e874e8 [ 30.067796] ffffffff8153c51c ffffed0039144368 ffff8801da0013c0 0000000000000000 [ 30.069187] Call Trace: [ 30.069727] [] dump_stack+0xc1/0x128 [ 30.070483] [] kasan_object_err+0x1c/0x70 [ 30.071262] [] kasan_report.part.1+0x21c/0x500 [ 30.072094] [] ? bio_copy_user_iov+0xe61/0xea0 [ 30.073145] [] __asan_report_load8_noabort+0x29/0x30 [ 30.074208] [] bio_copy_user_iov+0xe61/0xea0 [ 30.075236] [] ? bio_uncopy_user+0x600/0x600 [ 30.076271] [] ? __sbitmap_queue_get+0xfb/0x230 [ 30.077170] [] ? __bt_get+0x199/0x1f0 [ 30.077925] [] blk_rq_map_user_iov+0x237/0x790 [ 30.078763] [] ? blk_rq_append_bio+0x1a0/0x1a0 [ 30.083659] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 30.090640] [] ? kvm_sched_clock_read+0x9/0x20 [ 30.096838] [] ? import_single_range+0x1d4/0x2b0 [ 30.103216] [] blk_rq_map_user+0x111/0x1a0 [ 30.109063] [] ? blk_rq_map_user_iov+0x790/0x790 [ 30.115441] [] ? sg_res_in_use+0x1f/0x130 [ 30.121203] [] ? sg_res_in_use+0xea/0x130 [ 30.126971] [] ? _raw_read_unlock_irqrestore+0x45/0x70 [ 30.133858] [] sg_common_write.isra.24+0xc1a/0x17c0 [ 30.140522] [] ? sg_open+0x15a0/0x15a0 [ 30.146026] [] ? __might_fault+0xe4/0x1d0 [ 30.151794] [] ? check_stack_object+0x68/0x140 [ 30.158006] [] ? __check_object_size+0x174/0x3a9 [ 30.164391] [] sg_write+0x688/0xad0 [ 30.169645] [] ? sg_ioctl+0x29f0/0x29f0 [ 30.175236] [] ? sock_alloc_inode+0x66/0x250 [ 30.181258] [] ? sock_alloc+0x41/0x270 [ 30.186759] [] ? __sock_create+0xa5/0x640 [ 30.192520] [] ? SyS_socket+0xf0/0x1b0 [ 30.198023] [] ? entry_SYSCALL_64_fastpath+0x23/0xc6 [ 30.204743] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 30.211722] [] ? do_futex+0x3e8/0x1640 [ 30.217225] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 30.224202] [] ? kasan_unpoison_shadow+0x35/0x50 [ 30.230577] [] ? kasan_kmalloc+0xad/0xe0 [ 30.236256] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 30.243257] [] ? sg_ioctl+0x29f0/0x29f0 [ 30.248878] [] __vfs_write+0x103/0x680 [ 30.254382] [] ? default_llseek+0x290/0x290 [ 30.260319] [] ? __might_sleep+0x95/0x1a0 [ 30.266094] [] ? __inode_security_revalidate+0xd9/0x130 [ 30.273076] [] ? avc_policy_seqno+0x9/0x20 [ 30.278928] [] ? selinux_file_permission+0x82/0x460 [ 30.285562] [] ? security_file_permission+0x89/0x1e0 [ 30.292282] [] ? rw_verify_area+0xe5/0x2b0 [ 30.298157] [] vfs_write+0x170/0x4e0 [ 30.303500] [] SyS_write+0xd9/0x1b0 [ 30.308743] [] ? SyS_read+0x1b0/0x1b0 [ 30.314156] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 30.320707] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 30.327252] Object at ffff8801c8a21b40, in cache kmalloc-256 size: 256 [ 30.333876] Allocated: [ 30.336350] PID = 3406 [ 30.338830] save_stack_trace+0x16/0x20 [ 30.342770] save_stack+0x43/0xd0 [ 30.346189] kasan_kmalloc+0xad/0xe0 [ 30.349862] __kmalloc+0x11d/0x310 [ 30.353366] sg_build_indirect.isra.23+0x8b/0x550 [ 30.358173] sg_build_reserve+0x8d/0xb0 [ 30.362107] sg_open+0x946/0x15a0 [ 30.365525] chrdev_open+0x22b/0x4c0 [ 30.369201] do_dentry_open+0x607/0xc60 [ 30.373138] vfs_open+0x105/0x220 [ 30.376570] path_openat+0x64c/0x2a60 [ 30.380336] do_filp_open+0x197/0x290 [ 30.384105] do_sys_open+0x352/0x4c0 [ 30.387787] SyS_open+0x2d/0x40 [ 30.391033] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 30.395747] Freed: [ 30.397858] PID = 3406 [ 30.400341] save_stack_trace+0x16/0x20 [ 30.404279] save_stack+0x43/0xd0 [ 30.407711] kasan_slab_free+0x73/0xc0 [ 30.411560] kfree+0xf0/0x2f0 [ 30.414634] sg_remove_scat.isra.20+0x212/0x2d0 [ 30.419263] sg_ioctl+0x12d0/0x29f0 [ 30.422858] do_vfs_ioctl+0x1aa/0x10c0 [ 30.426708] SyS_ioctl+0x8f/0xc0 [ 30.430040] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 30.434756] Memory state around the buggy address: [ 30.439649] ffff8801c8a21a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 30.446971] ffff8801c8a21a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 30.454295] >ffff8801c8a21b00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 30.461617] ^ [ 30.467030] ffff8801c8a21b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.474359] ffff8801c8a21c00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 30.481680] ================================================================== [ 30.490441] ================================================================== [ 30.497813] BUG: KASAN: wild-memory-access on address ffe7087636e78000 [ 30.504443] Write of size 2 by task syz-executor6/3403 [ 30.509685] CPU: 0 PID: 3403 Comm: syz-executor6 Tainted: G B 4.9.42-g02f29ab #24 [ 30.518395] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.527714] ffff8801c6e87448 ffffffff81d92909 ffff8801c6e87618 0000000000000002 [ 30.535680] 0000000000000001 ffff8801c6e87840 ffe7087636e78000 ffff8801c6e874d0 [ 30.543627] ffffffff8153c9cf 0000000000000000 0000000000000001 ffffffff81ddc1c4 [ 30.551561] Call Trace: [ 30.554117] [] dump_stack+0xc1/0x128 [ 30.559462] [] kasan_report.part.1+0x40f/0x500 [ 30.565677] [] ? copy_page_from_iter+0x1a4/0x5d0 [ 30.572051] [] ? __might_fault+0xe4/0x1d0 [ 30.577832] [] kasan_report+0x20/0x30 [ 30.583244] [] check_memory_region+0x137/0x190 [ 30.589439] [] kasan_check_write+0x14/0x20 [ 30.595295] [] copy_page_from_iter+0x1a4/0x5d0 [ 30.601496] [] bio_copy_user_iov+0xb05/0xea0 [ 30.607516] [] ? bio_uncopy_user+0x600/0x600 [ 30.613541] [] ? __bt_get+0x199/0x1f0 [ 30.618969] [] blk_rq_map_user_iov+0x237/0x790 [ 30.625166] [] ? blk_rq_append_bio+0x1a0/0x1a0 [ 30.631366] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 30.638344] [] ? kvm_sched_clock_read+0x9/0x20 [ 30.644549] [] ? import_single_range+0x1d4/0x2b0 [ 30.650943] [] blk_rq_map_user+0x111/0x1a0 [ 30.656792] [] ? blk_rq_map_user_iov+0x790/0x790 [ 30.663159] [] ? sg_res_in_use+0x1f/0x130 [ 30.668950] [] ? sg_res_in_use+0xea/0x130 [ 30.674712] [] ? _raw_read_unlock_irqrestore+0x45/0x70 [ 30.681616] [] sg_common_write.isra.24+0xc1a/0x17c0 [ 30.688243] [] ? sg_open+0x15a0/0x15a0 [ 30.693760] [] ? __might_fault+0xe4/0x1d0 [ 30.699536] [] ? check_stack_object+0x68/0x140 [ 30.705741] [] ? __check_object_size+0x174/0x3a9 [ 30.712109] [] sg_write+0x688/0xad0 [ 30.717348] [] ? sg_ioctl+0x29f0/0x29f0 [ 30.722937] [] ? sock_alloc_inode+0x66/0x250 [ 30.728955] [] ? sock_alloc+0x41/0x270 [ 30.734463] [] ? __sock_create+0xa5/0x640 [ 30.740223] [] ? SyS_socket+0xf0/0x1b0 [ 30.745728] [] ? entry_SYSCALL_64_fastpath+0x23/0xc6 [ 30.752446] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 30.759422] [] ? do_futex+0x3e8/0x1640 [ 30.764924] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 30.771914] [] ? kasan_unpoison_shadow+0x35/0x50 [ 30.778283] [] ? kasan_kmalloc+0xad/0xe0 [ 30.783957] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 30.790946] [] ? sg_ioctl+0x29f0/0x29f0 [ 30.796530] [] __vfs_write+0x103/0x680 [ 30.802030] [] ? default_llseek+0x290/0x290 [ 30.807972] [] ? __might_sleep+0x95/0x1a0 [ 30.813740] [] ? __inode_security_revalidate+0xd9/0x130 [ 30.820718] [] ? avc_policy_seqno+0x9/0x20 [ 30.826567] [] ? selinux_file_permission+0x82/0x460 [ 30.833200] [] ? security_file_permission+0x89/0x1e0 [ 30.839917] [] ? rw_verify_area+0xe5/0x2b0 [ 30.845764] [] vfs_write+0x170/0x4e0 [ 30.851086] [] SyS_write+0xd9/0x1b0 [ 30.856323] [] ? SyS_read+0x1b0/0x1b0 [ 30.861740] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 30.868317] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 30.874874] ================================================================== [ 30.884504] ================================================================== [ 30.891880] BUG: KASAN: wild-memory-access on address ffe7087636e78000 [ 30.898504] Write of size 2 by task syz-executor6/3403 [ 30.903743] CPU: 1 PID: 3403 Comm: syz-executor6 Tainted: G B 4.9.42-g02f29ab #24 [ 30.912452] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.921781] ffff8801c6e873f8 ffffffff81d92909 ffe7087636e78000 0000000000000002 [ 30.929715] 0000000000000001 00000000205cbf9f ffe7087636e78000 ffff8801c6e87480 [ 30.937693] ffffffff8153c9cf 0000000000000000 0000000000000000 ffffffff81dc6014 [ 30.945636] Call Trace: [ 30.948186] [] dump_stack+0xc1/0x128 [ 30.953535] [] kasan_report.part.1+0x40f/0x500 [ 30.959731] [] ? copy_user_handle_tail+0xb4/0xd0 [ 30.966101] [] ? retint_kernel+0x2d/0x2d [ 30.971774] [] kasan_report+0x20/0x30 [ 30.977185] [] check_memory_region+0x137/0x190 [ 30.983377] [] memset+0x23/0x40 [ 30.988270] [] copy_user_handle_tail+0xb4/0xd0 [ 30.994463] [] copy_page_from_iter+0x1c0/0x5d0 [ 31.000659] [] bio_copy_user_iov+0xb05/0xea0 [ 31.006679] [] ? bio_uncopy_user+0x600/0x600 [ 31.012701] [] ? __bt_get+0x199/0x1f0 [ 31.018122] [] blk_rq_map_user_iov+0x237/0x790 [ 31.024323] [] ? blk_rq_append_bio+0x1a0/0x1a0 [ 31.030534] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 31.037522] [] ? kvm_sched_clock_read+0x9/0x20 [ 31.043731] [] ? import_single_range+0x1d4/0x2b0 [ 31.050116] [] blk_rq_map_user+0x111/0x1a0 [ 31.055968] [] ? blk_rq_map_user_iov+0x790/0x790