===================================================== BUG: KMSAN: kernel-infoleak in kmsan_copy_to_user+0x81/0x90 mm/kmsan/kmsan_hooks.c:253 CPU: 0 PID: 27359 Comm: syz-executor.2 Not tainted 5.9.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x21c/0x280 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:122 kmsan_internal_check_memory+0x238/0x3d0 mm/kmsan/kmsan.c:424 kmsan_copy_to_user+0x81/0x90 mm/kmsan/kmsan_hooks.c:253 instrument_copy_to_user include/linux/instrumented.h:91 [inline] _copy_to_user+0x18e/0x260 lib/usercopy.c:30 scsi_put_cdrom_generic_arg include/linux/uaccess.h:177 [inline] scsi_cdrom_send_packet block/scsi_ioctl.c:770 [inline] scsi_cmd_ioctl+0x2422/0x25a0 block/scsi_ioctl.c:827 scsi_cmd_blk_ioctl+0x1f6/0x240 block/scsi_ioctl.c:876 sd_ioctl_common+0x50a/0x5c0 drivers/scsi/sd.c:1531 sd_compat_ioctl+0xc5/0x220 drivers/scsi/sd.c:1733 compat_blkdev_ioctl+0x74b/0x1200 block/ioctl.c:691 __do_compat_sys_ioctl fs/ioctl.c:842 [inline] __se_compat_sys_ioctl+0x55f/0x1100 fs/ioctl.c:793 __ia32_compat_sys_ioctl+0x4a/0x70 fs/ioctl.c:793 do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline] __do_fast_syscall_32+0x129/0x180 arch/x86/entry/common.c:139 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:162 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:205 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f4e549 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f55480cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000005393 RDX: 0000000020006400 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Local variable ----cgc32.i42.i@scsi_cmd_ioctl created at: scsi_put_cdrom_generic_arg block/scsi_ioctl.c:695 [inline] scsi_cdrom_send_packet block/scsi_ioctl.c:770 [inline] scsi_cmd_ioctl+0x2257/0x25a0 block/scsi_ioctl.c:827 scsi_put_cdrom_generic_arg block/scsi_ioctl.c:695 [inline] scsi_cdrom_send_packet block/scsi_ioctl.c:770 [inline] scsi_cmd_ioctl+0x2257/0x25a0 block/scsi_ioctl.c:827 Bytes 29-31 of 44 are uninitialized Memory access of size 44 starts at ffff888109c57ac8 Data copied to user address 0000000020006400 =====================================================