================================================================== BUG: KMSAN: kernel-infoleak in copyout lib/iov_iter.c:140 [inline] BUG: KMSAN: kernel-infoleak in copy_page_to_iter_iovec lib/iov_iter.c:212 [inline] BUG: KMSAN: kernel-infoleak in copy_page_to_iter+0x754/0x1b70 lib/iov_iter.c:716 CPU: 0 PID: 7204 Comm: blkid Not tainted 4.17.0+ #9 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+0x185/0x1d0 lib/dump_stack.c:113 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:1125 kmsan_internal_check_memory+0x17e/0x1f0 mm/kmsan/kmsan.c:1238 kmsan_copy_to_user+0x7a/0x160 mm/kmsan/kmsan.c:1261 copyout lib/iov_iter.c:140 [inline] copy_page_to_iter_iovec lib/iov_iter.c:212 [inline] copy_page_to_iter+0x754/0x1b70 lib/iov_iter.c:716 generic_file_buffered_read mm/filemap.c:2185 [inline] generic_file_read_iter+0x2ef8/0x44d0 mm/filemap.c:2362 blkdev_read_iter+0x20d/0x280 fs/block_dev.c:1930 call_read_iter include/linux/fs.h:1778 [inline] new_sync_read fs/read_write.c:406 [inline] __vfs_read+0x775/0x9d0 fs/read_write.c:418 vfs_read+0x36c/0x6b0 fs/read_write.c:452 ksys_read fs/read_write.c:578 [inline] __do_sys_read fs/read_write.c:588 [inline] __se_sys_read fs/read_write.c:586 [inline] __x64_sys_read+0x1bf/0x3e0 fs/read_write.c:586 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f1c98000310 RSP: 002b:00007ffc71ee83e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1c98000310 RDX: 0000000000000100 RSI: 0000000002097df8 RDI: 0000000000000003 RBP: 0000000002097dd0 R08: 0000000000000028 R09: 0000000001680000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000002097030 R13: 0000000000000100 R14: 0000000002097080 R15: 0000000002097de8 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:282 [inline] kmsan_alloc_meta_for_pages+0x161/0x3a0 mm/kmsan/kmsan.c:819 kmsan_alloc_page+0x82/0xe0 mm/kmsan/kmsan.c:889 __alloc_pages_nodemask+0xf7b/0x5cc0 mm/page_alloc.c:4402 alloc_pages_current+0x6b1/0x970 mm/mempolicy.c:2093 alloc_pages include/linux/gfp.h:494 [inline] __page_cache_alloc+0x95/0x320 mm/filemap.c:946 pagecache_get_page+0x52b/0x1450 mm/filemap.c:1577 grab_cache_page_write_begin+0x10d/0x190 mm/filemap.c:3089 block_write_begin+0xf9/0x3a0 fs/buffer.c:2068 blkdev_write_begin+0xf5/0x110 fs/block_dev.c:584 generic_perform_write+0x438/0x9d0 mm/filemap.c:3139 __generic_file_write_iter+0x43b/0xa10 mm/filemap.c:3264 blkdev_write_iter+0x3a8/0x5f0 fs/block_dev.c:1910 do_iter_readv_writev+0x81c/0xa20 include/linux/fs.h:1778 do_iter_write+0x30d/0xd50 fs/read_write.c:959 vfs_writev fs/read_write.c:1004 [inline] do_writev+0x3be/0x820 fs/read_write.c:1039 __do_sys_writev fs/read_write.c:1112 [inline] __se_sys_writev fs/read_write.c:1109 [inline] __x64_sys_writev+0xe1/0x120 fs/read_write.c:1109 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Bytes 4-255 of 256 are uninitialized Memory access starts at ffff88012bde2000 ==================================================================