===================================================== BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:121 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_user+0xc0/0x100 lib/usercopy.c:33 instrument_copy_to_user include/linux/instrumented.h:121 [inline] _copy_to_user+0xc0/0x100 lib/usercopy.c:33 copy_to_user include/linux/uaccess.h:169 [inline] iommufd_vfio_iommu_get_info drivers/iommu/iommufd/vfio_compat.c:437 [inline] iommufd_vfio_ioctl+0x1b8c/0x2190 drivers/iommu/iommufd/vfio_compat.c:462 iommufd_fops_ioctl+0x13a/0x870 drivers/iommu/iommufd/main.c:315 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0x222/0x400 fs/ioctl.c:856 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Local variable info.i created at: iommufd_vfio_iommu_get_info drivers/iommu/iommufd/vfio_compat.c:384 [inline] iommufd_vfio_ioctl+0x247/0x2190 drivers/iommu/iommufd/vfio_compat.c:462 iommufd_fops_ioctl+0x13a/0x870 drivers/iommu/iommufd/main.c:315 Bytes 20-23 of 24 are uninitialized Memory access of size 24 starts at ffff8880a5e93d10 Data copied to user address 0000000020000140 CPU: 1 PID: 5680 Comm: syz-executor.1 Not tainted 6.2.0-syzkaller-81152-g97e36f4aa06f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 =====================================================