[....] Starting enhanced syslogd: rsyslogd[ 10.822784] audit: type=1400 audit(1515109405.205:5): avc: denied { syslog } for pid=3310 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.970579] audit: type=1400 audit(1515109410.353:6): avc: denied { map } for pid=3449 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.15.226' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 26.949099] audit: type=1400 audit(1515109421.331:7): avc: denied { map } for pid=3465 comm="syzkaller455771" path="/root/syzkaller455771126" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.187493] ================================================================== [ 27.194900] BUG: KASAN: null-ptr-deref in linear_transfer+0x64a/0x900 [ 27.201458] Write of size 2 at addr (null) by task syzkaller455771/3786 [ 27.209044] [ 27.210641] CPU: 1 PID: 3786 Comm: syzkaller455771 Not tainted 4.15.0-rc6-next-20180103+ #87 [ 27.219181] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.228503] Call Trace: [ 27.231063] dump_stack+0x137/0x198 executing program executing program executing program executing program [ 27.234660] ? linear_transfer+0x64a/0x900 [ 27.238866] kasan_report+0x13f/0x360 [ 27.242640] check_memory_region+0x137/0x190 [ 27.247018] memcpy+0x37/0x50 [ 27.250094] linear_transfer+0x64a/0x900 [ 27.254138] ? snd_pcm_plugin_build_copy+0x360/0x360 [ 27.259222] snd_pcm_plug_write_transfer+0x20b/0x390 [ 27.264311] ? snd_pcm_plug_client_channels_buf+0x3f0/0x3f0 [ 27.270000] ? snd_pcm_format_physical_width+0x5b/0x70 [ 27.275248] ? snd_pcm_plug_client_channels_buf+0x1db/0x3f0 [ 27.280934] snd_pcm_oss_write2+0x22e/0x3c0 [ 27.285226] ? snd_pcm_oss_write3+0x1b0/0x1b0 [ 27.289687] ? snd_pcm_kernel_ioctl+0x9e/0x240 [ 27.294244] snd_pcm_oss_write+0x4c1/0x690 [ 27.298471] do_iter_write+0x3ca/0x540 [ 27.302327] ? dup_iter+0x260/0x260 [ 27.305932] vfs_writev+0x158/0x2d0 [ 27.309530] ? vfs_iter_write+0xb0/0xb0 [ 27.313478] ? __fget+0x202/0x390 [ 27.316913] ? __fget+0x22b/0x390 [ 27.320350] ? __fget_light+0x188/0x1e0 [ 27.324303] do_writev+0xe1/0x240 [ 27.327725] ? do_writev+0xe1/0x240 [ 27.331326] ? vfs_writev+0x2d0/0x2d0 [ 27.335100] ? entry_SYSCALL_64_fastpath+0x5/0x9a [ 27.339917] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.344922] SyS_writev+0x27/0x30 [ 27.348364] entry_SYSCALL_64_fastpath+0x23/0x9a [ 27.353090] RIP: 0033:0x449c49 [ 27.356248] RSP: 002b:00007fe3b0f20da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 27.363925] RAX: ffffffffffffffda RBX: 00000000006dbc3c RCX: 0000000000449c49 [ 27.371801] RDX: 0000000000000001 RSI: 000000002000bff8 RDI: 0000000000000006 [ 27.379056] RBP: 00000000006dbc38 R08: 0000000000000000 R09: 0000000000000000 [ 27.386305] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 27.393546] R13: 78756e696c65732f R14: 7073642f7665642f R15: 000000000000000d [ 27.400799] ================================================================== [ 27.408129] Disabling lock debugging due to kernel taint [ 27.413623] Kernel panic - not syncing: panic_on_warn set ... [ 27.413623] [ 27.420955] CPU: 1 PID: 3786 Comm: syzkaller455771 Tainted: G B 4.15.0-rc6-next-20180103+ #87 [ 27.430799] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.440124] Call Trace: [ 27.442683] dump_stack+0x137/0x198 [ 27.446281] ? linear_transfer+0x620/0x900 [ 27.450493] panic+0x1e4/0x41c [ 27.453652] ? refcount_error_report+0x214/0x214 [ 27.458377] ? add_taint+0x1c/0x50 [ 27.461884] ? add_taint+0x1c/0x50 [ 27.465390] ? linear_transfer+0x64a/0x900 [ 27.469591] kasan_end_report+0x50/0x50 [ 27.473533] kasan_report+0x148/0x360 [ 27.477302] check_memory_region+0x137/0x190 [ 27.481677] memcpy+0x37/0x50 [ 27.484747] linear_transfer+0x64a/0x900 [ 27.488791] ? snd_pcm_plugin_build_copy+0x360/0x360 [ 27.493867] snd_pcm_plug_write_transfer+0x20b/0x390 [ 27.498940] ? snd_pcm_plug_client_channels_buf+0x3f0/0x3f0 [ 27.504629] ? snd_pcm_format_physical_width+0x5b/0x70 [ 27.509880] ? snd_pcm_plug_client_channels_buf+0x1db/0x3f0 [ 27.515574] snd_pcm_oss_write2+0x22e/0x3c0 [ 27.519874] ? snd_pcm_oss_write3+0x1b0/0x1b0 [ 27.524338] ? snd_pcm_kernel_ioctl+0x9e/0x240 [ 27.528900] snd_pcm_oss_write+0x4c1/0x690 [ 27.533111] do_iter_write+0x3ca/0x540 [ 27.536969] ? dup_iter+0x260/0x260 [ 27.540568] vfs_writev+0x158/0x2d0 [ 27.544164] ? vfs_iter_write+0xb0/0xb0 [ 27.548108] ? __fget+0x202/0x390 [ 27.551540] ? __fget+0x22b/0x390 [ 27.554963] ? __fget_light+0x188/0x1e0 [ 27.558906] do_writev+0xe1/0x240 [ 27.562336] ? do_writev+0xe1/0x240 [ 27.565935] ? vfs_writev+0x2d0/0x2d0 [ 27.569704] ? entry_SYSCALL_64_fastpath+0x5/0x9a [ 27.574528] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.579513] SyS_writev+0x27/0x30 [ 27.582937] entry_SYSCALL_64_fastpath+0x23/0x9a [ 27.587667] RIP: 0033:0x449c49 [ 27.590823] RSP: 002b:00007fe3b0f20da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 27.598496] RAX: ffffffffffffffda RBX: 00000000006dbc3c RCX: 0000000000449c49 [ 27.605732] RDX: 0000000000000001 RSI: 000000002000bff8 RDI: 0000000000000006 [ 27.612970] RBP: 00000000006dbc38 R08: 0000000000000000 R09: 0000000000000000 [ 27.620211] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 27.627450] R13: 78756e696c65732f R14: 7073642f7665642f R15: 000000000000000d [ 27.635028] Dumping ftrace buffer: [ 27.638541] (ftrace buffer empty) [ 27.642221] Kernel Offset: disabled [ 27.645817] Rebooting in 86400 seconds..