================================================================== 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: 1 PID: 657 Comm: syz-executor3 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 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_pread64 fs/read_write.c:626 [inline] __do_sys_pread64 fs/read_write.c:636 [inline] __se_sys_pread64 fs/read_write.c:633 [inline] __x64_sys_pread64+0x2f2/0x390 fs/read_write.c:633 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x455a99 RSP: 002b:00007f6dfc740c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000011 RAX: ffffffffffffffda RBX: 00007f6dfc7416d4 RCX: 0000000000455a99 RDX: 00000000000000e3 RSI: 0000000020000200 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000027 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c06cc R14: 00000000004d00c8 R15: 0000000000000000 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 page_cache_alloc include/linux/pagemap.h:234 [inline] generic_file_buffered_read mm/filemap.c:2273 [inline] generic_file_read_iter+0x22a4/0x44d0 mm/filemap.c:2362 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_pread64 fs/read_write.c:626 [inline] __do_sys_pread64 fs/read_write.c:636 [inline] __se_sys_pread64 fs/read_write.c:633 [inline] __x64_sys_pread64+0x2f2/0x390 fs/read_write.c:633 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Bytes 0-226 of 227 are uninitialized Memory access starts at ffff88009e54f027 ==================================================================