================================================================== 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: 24698 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 do_iter_readv_writev+0x81c/0xa20 include/linux/fs.h:1778 do_iter_read+0x303/0xd80 fs/read_write.c:922 vfs_readv fs/read_write.c:986 [inline] do_readv+0x295/0x5f0 fs/read_write.c:1019 __do_sys_readv fs/read_write.c:1106 [inline] __se_sys_readv fs/read_write.c:1103 [inline] __x64_sys_readv+0xe1/0x120 fs/read_write.c:1103 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x455a99 RSP: 002b:00007fb47341ec68 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 00007fb47341f6d4 RCX: 0000000000455a99 RDX: 0000000000000004 RSI: 0000000020000440 RDI: 0000000000000015 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c06f0 R14: 00000000004d0398 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 do_iter_readv_writev+0x81c/0xa20 include/linux/fs.h:1778 do_iter_read+0x303/0xd80 fs/read_write.c:922 vfs_readv fs/read_write.c:986 [inline] do_readv+0x295/0x5f0 fs/read_write.c:1019 __do_sys_readv fs/read_write.c:1106 [inline] __se_sys_readv fs/read_write.c:1103 [inline] __x64_sys_readv+0xe1/0x120 fs/read_write.c:1103 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Bytes 0-222 of 223 are uninitialized Memory access starts at ffff88015c803000 ==================================================================