================================================================== BUG: KASAN: stack-out-of-bounds in _copy_to_iter+0x493/0x1420 Read of size 4094 at addr ffff888044a57b12 by task syz-executor.5/6518 CPU: 1 PID: 6518 Comm: syz-executor.5 Not tainted 5.19.0-rc6-next-20220715 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: dump_stack_lvl+0x8b/0xb3 print_report.cold+0x5e/0x5e5 kasan_report+0xb1/0x1c0 kasan_check_range+0x35/0x1c0 memcpy+0x20/0x60 _copy_to_iter+0x493/0x1420 tty_read+0x29a/0x5d0 generic_file_splice_read+0x187/0x4d0 do_splice_to+0x1bc/0x240 splice_file_to_pipe+0x104/0x120 do_sendfile+0x42a/0x1280 __x64_sys_sendfile64+0x1d1/0x210 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f5cb0409b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5cad97f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f5cb051cf60 RCX: 00007f5cb0409b19 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004 RBP: 00007f5cb0463f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffc152dd2f R14: 00007f5cad97f300 R15: 0000000000022000 The buggy address belongs to stack of task syz-executor.5/6518 and is located at offset 66 in frame: tty_read+0x0/0x5d0 This frame has 2 objects: [32, 40) 'cookie' [64, 128) 'kernel_buf' The buggy address belongs to the physical page: page:00000000b8e13450 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x44a57 flags: 0x100000000000000(node=0|zone=1) raw: 0100000000000000 0000000000000000 ffffea00011295c8 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888044a57a00: 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 ffff888044a57a80: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 >ffff888044a57b00: f2 f2 00 00 00 00 00 00 00 00 f3 f3 f3 f3 00 00 ^ ffff888044a57b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 ffff888044a57c00: f1 f1 f1 00 00 00 00 00 f2 f2 f2 f2 f2 00 00 00 ================================================================== sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. kernel write not supported for file /vcsa1 (pid: 51 comm: kworker/0:2) kernel write not supported for file /vcsa1 (pid: 51 comm: kworker/0:2) audit: type=1400 audit(1657906990.751:18): avc: denied { map } for pid=6640 comm="syz-executor.4" path="pipe:[22207]" dev="pipefs" ino=22207 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=fifo_file permissive=1 syz-executor.1 calls setitimer() with new_value NULL pointer. Misfeature support will be removed devpts: called with bogus options devpts: called with bogus options sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s sr 1:0:0:0: [sr0] tag#0 Sense Key : Not Ready [current] sr 1:0:0:0: [sr0] tag#0 Add. Sense: Medium not present sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 00 00 00 00 00 08 00 blk_print_req_error: 7 callbacks suppressed I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 2 sr 1:0:0:0: [sr0] tag#0 unaligned transfer I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 buffer_io_error: 6 callbacks suppressed Buffer I/O error on dev sr0, logical block 0, async page read sr 1:0:0:0: [sr0] tag#0 unaligned transfer I/O error, dev sr0, sector 1 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 Buffer I/O error on dev sr0, logical block 1, async page read sr 1:0:0:0: [sr0] tag#0 unaligned transfer I/O error, dev sr0, sector 2 op 0x0:(READ) flags 0x0 phys_seg 2 prio class 2 Buffer I/O error on dev sr0, logical block 2, async page read Buffer I/O error on dev sr0, logical block 3, async page read sr 1:0:0:0: [sr0] tag#0 unaligned transfer I/O error, dev sr0, sector 4 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 Buffer I/O error on dev sr0, logical block 4, async page read sr 1:0:0:0: [sr0] tag#0 unaligned transfer I/O error, dev sr0, sector 5 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 Buffer I/O error on dev sr0, logical block 5, async page read sr 1:0:0:0: [sr0] tag#0 unaligned transfer I/O error, dev sr0, sector 6 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 Buffer I/O error on dev sr0, logical block 6, async page read sr 1:0:0:0: [sr0] tag#0 unaligned transfer I/O error, dev sr0, sector 7 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 Buffer I/O error on dev sr0, logical block 7, async page read UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16