[....] Starting enhanced syslogd: rsyslogd[ 11.436944] audit: type=1400 audit(1514261324.928:5): avc: denied { syslog } for pid=2996 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 periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] 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: [ 16.679335] audit: type=1400 audit(1514261330.171:6): avc: denied { map } for pid=3135 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 'ci-upstream-kasan-gce-386-2,10.128.0.41' (ECDSA) to the list of known hosts. executing program [ 22.840616] audit: type=1400 audit(1514261336.332:7): avc: denied { map } for pid=3149 comm="syzkaller578789" path="/root/syzkaller578789583" 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 [ 22.867632] ================================================================== [ 22.875003] BUG: KASAN: stack-out-of-bounds in rds_sendmsg+0x1f02/0x1f90 [ 22.881808] Read of size 8 at addr ffff8801cf9479e0 by task syzkaller578789/3149 [ 22.889304] [ 22.890912] CPU: 1 PID: 3149 Comm: syzkaller578789 Not tainted 4.15.0-rc5+ #147 [ 22.898330] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.907653] Call Trace: [ 22.910215] dump_stack+0x194/0x257 [ 22.913812] ? arch_local_irq_restore+0x53/0x53 [ 22.918447] ? show_regs_print_info+0x18/0x18 [ 22.922918] ? _raw_spin_unlock_bh+0x30/0x40 [ 22.927295] ? rds_sendmsg+0x1f02/0x1f90 [ 22.931326] print_address_description+0x73/0x250 [ 22.936136] ? rds_sendmsg+0x1f02/0x1f90 [ 22.940164] kasan_report+0x25b/0x340 [ 22.943937] __asan_report_load8_noabort+0x14/0x20 [ 22.948832] rds_sendmsg+0x1f02/0x1f90 [ 22.952700] ? rds_send_drop_to+0x19d0/0x19d0 [ 22.957171] ? lock_downgrade+0x980/0x980 [ 22.961302] ? sock_has_perm+0x2a4/0x420 [ 22.965333] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 22.970665] ? __might_sleep+0x95/0x190 [ 22.974613] ? kasan_check_write+0x14/0x20 [ 22.978814] ? _copy_from_user+0x99/0x110 [ 22.982941] ? selinux_socket_sendmsg+0x36/0x40 [ 22.987579] ? security_socket_sendmsg+0x89/0xb0 [ 22.992306] ? rds_send_drop_to+0x19d0/0x19d0 [ 22.996776] sock_sendmsg+0xca/0x110 [ 23.000460] ___sys_sendmsg+0x320/0x8b0 [ 23.004409] ? copy_msghdr_from_user+0x590/0x590 [ 23.009134] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 23.014139] ? trace_hardirqs_on+0xd/0x10 [ 23.018267] ? _raw_spin_unlock_irq+0x27/0x70 [ 23.022736] ? finish_task_switch+0x1d3/0x740 [ 23.027198] ? finish_task_switch+0x1aa/0x740 [ 23.031664] ? copy_overflow+0x20/0x20 [ 23.035523] ? __fget_light+0x297/0x380 [ 23.039468] ? check_noncircular+0x20/0x20 [ 23.043682] ? check_noncircular+0x20/0x20 [ 23.047884] ? __pmd_alloc+0x4e0/0x4e0 [ 23.051749] ? __fdget+0x18/0x20 [ 23.055090] __sys_sendmmsg+0x31b/0x620 [ 23.059035] ? __sys_sendmmsg+0x31b/0x620 [ 23.063156] ? SyS_sendmsg+0x50/0x50 [ 23.066843] ? __do_page_fault+0x5f7/0xc90 [ 23.071051] ? lock_downgrade+0x980/0x980 [ 23.075179] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 23.079727] ? vmacache_find+0x5f/0x280 [ 23.083675] ? up_read+0x1a/0x40 [ 23.087009] ? __do_page_fault+0x3d6/0xc90 [ 23.091221] compat_SyS_sendmmsg+0x32/0x40 [ 23.095427] ? compat_SyS_sendmsg+0x40/0x40 [ 23.099720] do_fast_syscall_32+0x3ee/0xf9d [ 23.104015] ? do_int80_syscall_32+0x9d0/0x9d0 [ 23.108565] ? kasan_check_read+0x11/0x20 [ 23.112684] ? syscall_return_slowpath+0x550/0x550 [ 23.117582] ? SyS_rt_sigaction+0x94/0x1b0 [ 23.121784] ? SyS_sigprocmask+0x4b0/0x4b0 [ 23.125984] ? SyS_read+0x184/0x220 [ 23.129582] ? retint_user+0x18/0x18 [ 23.133272] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 23.138090] entry_SYSENTER_compat+0x54/0x63 [ 23.142467] RIP: 0023:0xf7fa0c79 [ 23.145795] RSP: 002b:00000000ffe9d17c EFLAGS: 00000286 ORIG_RAX: 0000000000000159 [ 23.153469] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020573000 [ 23.160710] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000015 [ 23.167947] RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000 [ 23.175182] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 23.182418] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 23.189670] [ 23.191262] The buggy address belongs to the page: [ 23.196157] page:00000000b18a2d0f count:0 mapcount:0 mapping: (null) index:0x0 [ 23.204267] flags: 0x2fffc0000000000() [ 23.208121] raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff [ 23.215966] raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000 [ 23.223816] page dumped because: kasan: bad access detected [ 23.229487] [ 23.231095] Memory state around the buggy address: [ 23.235997] ffff8801cf947880: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 [ 23.243323] ffff8801cf947900: f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00 00 [ 23.250648] >ffff8801cf947980: 00 00 00 00 f2 f2 f2 f2 00 00 00 00 04 f2 f2 f2 [ 23.257973] ^ [ 23.264430] ffff8801cf947a00: f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00 00 [ 23.271755] ffff8801cf947a80: 00 00 00 00 f3 f3 f3 f3 00 00 00 00 00 00 00 00 [ 23.279084] ================================================================== [ 23.286411] Disabling lock debugging due to kernel taint [ 23.291890] Kernel panic - not syncing: panic_on_warn set ... [ 23.291890] [ 23.299233] CPU: 1 PID: 3149 Comm: syzkaller578789 Tainted: G B 4.15.0-rc5+ #147 [ 23.307948] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.317267] Call Trace: [ 23.319822] dump_stack+0x194/0x257 [ 23.323414] ? arch_local_irq_restore+0x53/0x53 [ 23.328049] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 23.332768] ? vsnprintf+0x1ed/0x1900 [ 23.336534] ? rds_sendmsg+0x1e50/0x1f90 [ 23.340560] panic+0x1e4/0x41c [ 23.343716] ? refcount_error_report+0x214/0x214 [ 23.348437] ? add_taint+0x1c/0x50 [ 23.351942] ? add_taint+0x1c/0x50 [ 23.355448] ? rds_sendmsg+0x1f02/0x1f90 [ 23.359474] kasan_end_report+0x50/0x50 [ 23.363413] kasan_report+0x144/0x340 [ 23.367180] __asan_report_load8_noabort+0x14/0x20 [ 23.372073] rds_sendmsg+0x1f02/0x1f90 [ 23.375938] ? rds_send_drop_to+0x19d0/0x19d0 [ 23.380410] ? lock_downgrade+0x980/0x980 [ 23.384527] ? sock_has_perm+0x2a4/0x420 [ 23.388555] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 23.393884] ? __might_sleep+0x95/0x190 [ 23.397828] ? kasan_check_write+0x14/0x20 [ 23.402031] ? _copy_from_user+0x99/0x110 [ 23.406146] ? selinux_socket_sendmsg+0x36/0x40 [ 23.410781] ? security_socket_sendmsg+0x89/0xb0 [ 23.415502] ? rds_send_drop_to+0x19d0/0x19d0 [ 23.419965] sock_sendmsg+0xca/0x110 [ 23.423644] ___sys_sendmsg+0x320/0x8b0 [ 23.427595] ? copy_msghdr_from_user+0x590/0x590 [ 23.432323] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 23.437304] ? trace_hardirqs_on+0xd/0x10 [ 23.441418] ? _raw_spin_unlock_irq+0x27/0x70 [ 23.445884] ? finish_task_switch+0x1d3/0x740 [ 23.450341] ? finish_task_switch+0x1aa/0x740 [ 23.454805] ? copy_overflow+0x20/0x20 [ 23.458663] ? __fget_light+0x297/0x380 [ 23.462604] ? check_noncircular+0x20/0x20 [ 23.466809] ? check_noncircular+0x20/0x20 [ 23.471011] ? __pmd_alloc+0x4e0/0x4e0 [ 23.474870] ? __fdget+0x18/0x20 [ 23.478206] __sys_sendmmsg+0x31b/0x620 [ 23.482147] ? __sys_sendmmsg+0x31b/0x620 [ 23.486263] ? SyS_sendmsg+0x50/0x50 [ 23.489946] ? __do_page_fault+0x5f7/0xc90 [ 23.494147] ? lock_downgrade+0x980/0x980 [ 23.498279] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 23.502826] ? vmacache_find+0x5f/0x280 [ 23.506767] ? up_read+0x1a/0x40 [ 23.510100] ? __do_page_fault+0x3d6/0xc90 [ 23.514307] compat_SyS_sendmmsg+0x32/0x40 [ 23.518508] ? compat_SyS_sendmsg+0x40/0x40 [ 23.522797] do_fast_syscall_32+0x3ee/0xf9d [ 23.527087] ? do_int80_syscall_32+0x9d0/0x9d0 [ 23.531634] ? kasan_check_read+0x11/0x20 [ 23.535746] ? syscall_return_slowpath+0x550/0x550 [ 23.540641] ? SyS_rt_sigaction+0x94/0x1b0 [ 23.544842] ? SyS_sigprocmask+0x4b0/0x4b0 [ 23.549047] ? SyS_read+0x184/0x220 [ 23.552644] ? retint_user+0x18/0x18 [ 23.556330] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 23.561143] entry_SYSENTER_compat+0x54/0x63 [ 23.565515] RIP: 0023:0xf7fa0c79 [ 23.568845] RSP: 002b:00000000ffe9d17c EFLAGS: 00000286 ORIG_RAX: 0000000000000159 [ 23.576527] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020573000 [ 23.583768] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000015 [ 23.591005] RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000 [ 23.598251] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 23.605491] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 23.613114] Dumping ftrace buffer: [ 23.616619] (ftrace buffer empty) [ 23.620295] Kernel Offset: disabled [ 23.623886] Rebooting in 86400 seconds..