Messages in this thread | | | Date | Tue, 24 Oct 2017 19:46:16 -0400 | From | Dave Jones <> | Subject | out of bounds strscpy from seccomp_actions_logged_handler |
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(Triggered with trinity, but it seems just a 'cat /proc/sys/kernel/seccomp/actions_logged' reproduces just as easily).
BUG: KASAN: global-out-of-bounds in strscpy+0x133/0x2d0 Read of size 8 at addr ffffffff824b0028 by task trinity-c63/6883
CPU: 3 PID: 6883 Comm: trinity-c63 Not tainted 4.14.0-rc6-think+ #1 Call Trace: dump_stack+0xbc/0x145 ? dma_virt_map_sg+0xfb/0xfb print_address_description+0x2d/0x260 kasan_report+0x277/0x360 ? strscpy+0x133/0x2d0 strscpy+0x133/0x2d0 ? strcasecmp+0xb0/0xb0 seccomp_actions_logged_handler+0x2c5/0x440 ? seccomp_send_sigsys+0xd0/0xd0 ? lock_downgrade+0x310/0x310 ? lock_release+0x890/0x890 ? do_raw_spin_unlock+0x147/0x220 ? do_raw_spin_trylock+0x100/0x100 ? do_raw_spin_trylock+0x40/0x100 ? do_raw_spin_lock+0x110/0x110 proc_sys_call_handler+0x1b1/0x1f0 ? seccomp_send_sigsys+0xd0/0xd0 ? proc_sys_readdir+0x6d0/0x6d0 do_iter_read+0x23b/0x280 vfs_readv+0x107/0x180 ? compat_rw_copy_check_uvector+0x1d0/0x1d0 ? native_sched_clock+0xf9/0x1a0 ? cyc2ns_read_end+0x10/0x10 ? __fget_light+0x181/0x200 ? fget_raw+0x10/0x10 ? __lock_is_held+0x2e/0xd0 ? rcu_read_lock_sched_held+0x90/0xa0 ? __context_tracking_exit.part.4+0x223/0x290 ? context_tracking_recursion_enter+0x50/0x50 ? __task_pid_nr_ns+0x1c4/0x300 ? do_preadv+0xb0/0xf0 do_preadv+0xb0/0xf0 ? SyS_preadv+0x10/0x10 do_syscall_64+0x182/0x400 ? syscall_return_slowpath+0x270/0x270 ? rcu_read_lock_sched_held+0x90/0xa0 ? __context_tracking_exit.part.4+0x223/0x290 ? mark_held_locks+0x1b/0xa0 ? return_from_SYSCALL_64+0x2d/0x7a ? trace_hardirqs_on_caller+0x17a/0x250 ? trace_hardirqs_on_thunk+0x1a/0x1c entry_SYSCALL64_slow_path+0x25/0x25 RIP: 0033:0x7f52d5f45219 RSP: 002b:00007fff8a422838 EFLAGS: 00000246 ORIG_RAX: 0000000000000147 RAX: ffffffffffffffda RBX: 0000000000000147 RCX: 00007f52d5f45219 RDX: 00000000000000f3 RSI: 000055d6d5b413d0 RDI: 00000000000000b2 RBP: 00007fff8a4228e0 R08: 0000316c1272491c R09: 0000000000000000 R10: 00000000725c3dd7 R11: 0000000000000246 R12: 0000000000000002 R13: 00007f52d645b058 R14: 00007f52d661b698 R15: 00007f52d645b000
The buggy address belongs to the variable: kdb_rwtypes+0x1268/0x1320
Memory state around the buggy address: ffffffff824aff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffffff824aff80: 00 00 00 00 00 00 00 00 00 00 00 00 07 fa fa fa >ffffffff824b0000: fa fa fa fa 00 05 fa fa fa fa fa fa 02 fa fa fa ^ ffffffff824b0080: fa fa fa fa 00 00 01 fa fa fa fa fa 00 00 04 fa ffffffff824b0100: fa fa fa fa 00 06 fa fa fa fa fa fa 00 07 fa fa ================================================================== Disabling lock debugging due to kernel taint
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