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KMSAN: uninit-value in copy_page_to_iter

Status: closed as invalid on 2018/04/22 15:44
Subsystems: fs
[Documentation on labels]
First crash: 2223d, last: 2208d
▶ ▼ Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in copy_page_to_iter (3) fs C 23 1387d 1391d 0/26 closed as invalid on 2020/07/22 14:02
upstream KMSAN: uninit-value in copy_page_to_iter (2) mm C 4710 2161d 2208d 0/26 closed as invalid on 2018/06/29 16:18

Sample crash report:
==================================================================
BUG: KMSAN: uninit-value in copyout lib/iov_iter.c:140 [inline]
BUG: KMSAN: uninit-value in copy_page_to_iter_iovec lib/iov_iter.c:212 [inline]
BUG: KMSAN: uninit-value in copy_page_to_iter+0x754/0x1b70 lib/iov_iter.c:716
CPU: 1 PID: 4518 Comm: blkid Not tainted 4.16.0+ #85
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:53
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 kmsan_internal_check_memory+0x174/0x1e0 mm/kmsan/kmsan.c:1176
 kmsan_copy_to_user+0x69/0x160 mm/kmsan/kmsan.c:1199
 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:2187 [inline]
 generic_file_read_iter+0x2ee8/0x4440 mm/filemap.c:2364
 blkdev_read_iter+0x20d/0x280 fs/block_dev.c:1928
 call_read_iter include/linux/fs.h:1776 [inline]
 new_sync_read fs/read_write.c:401 [inline]
 __vfs_read+0x7dd/0x9b0 fs/read_write.c:413
 vfs_read+0x36c/0x6c0 fs/read_write.c:447
 SYSC_read+0x172/0x360 fs/read_write.c:573
 SyS_read+0x55/0x80 fs/read_write.c:566
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x7f06ee0a5310
RSP: 002b:00007ffc67b48068 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000001c00 RCX: 00007f06ee0a5310
RDX: 0000000000000400 RSI: 00000000021376e8 RDI: 0000000000000003
RBP: 00000000021376c0 R08: 0000000000000028 R09: 0000000001680000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000002136030
R13: 0000000000000400 R14: 0000000002136080 R15: 00000000021376d8

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:293 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:684
 kmsan_memcpy_origins+0x11d/0x170 mm/kmsan/kmsan.c:526
 __msan_memcpy+0x109/0x160 mm/kmsan/kmsan_instr.c:477
 memcpy_from_page lib/iov_iter.c:459 [inline]
 iov_iter_copy_from_user_atomic+0xb04/0x17d0 lib/iov_iter.c:792
 generic_perform_write+0x4c6/0x990 mm/filemap.c:3146
 __generic_file_write_iter+0x64d/0xa10 mm/filemap.c:3231
 blkdev_write_iter+0x3a8/0x5f0 fs/block_dev.c:1908
 do_iter_readv_writev+0x84d/0xa00 include/linux/fs.h:1776
 do_iter_write+0x30d/0xd40 fs/read_write.c:932
 vfs_iter_write+0x118/0x180 fs/read_write.c:945
 iter_file_splice_write+0xbc3/0x1710 fs/splice.c:749
 do_splice_from fs/splice.c:851 [inline]
 direct_splice_actor+0x19b/0x200 fs/splice.c:1018
 splice_direct_to_actor+0x764/0x1040 fs/splice.c:973
 do_splice_direct+0x335/0x540 fs/splice.c:1061
 do_sendfile+0x1067/0x1e40 fs/read_write.c:1413
 SYSC_sendfile64+0x1b3/0x300 fs/read_write.c:1468
 SyS_sendfile64+0x64/0x90 fs/read_write.c:1460
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
 kmsan_alloc_meta_for_pages+0x161/0x3a0 mm/kmsan/kmsan.c:814
 kmsan_alloc_page+0x82/0xe0 mm/kmsan/kmsan.c:868
 __alloc_pages_nodemask+0xf5b/0x5dc0 mm/page_alloc.c:4283
 alloc_pages_vma+0xcc8/0x1800 mm/mempolicy.c:2019
 shmem_alloc_page mm/shmem.c:1471 [inline]
 shmem_alloc_and_acct_page+0x6d5/0x1000 mm/shmem.c:1496
 shmem_getpage_gfp+0x35db/0x5770 mm/shmem.c:1771
 shmem_getpage mm/shmem.c:131 [inline]
 shmem_file_read_iter+0x508/0x1180 mm/shmem.c:2456
 call_read_iter include/linux/fs.h:1776 [inline]
 generic_file_splice_read+0x5d2/0x900 fs/splice.c:307
 do_splice_to fs/splice.c:880 [inline]
 splice_direct_to_actor+0x4c6/0x1040 fs/splice.c:952
 do_splice_direct+0x335/0x540 fs/splice.c:1061
 do_sendfile+0x1067/0x1e40 fs/read_write.c:1413
 SYSC_sendfile64+0x1b3/0x300 fs/read_write.c:1468
 SyS_sendfile64+0x64/0x90 fs/read_write.c:1460
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2

Bytes 0-1023 of 1024 are uninitialized
==================================================================

Crashes (2911):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/04/21 15:50 https://github.com/google/kmsan.git master a7f95e9c8a95 d23fcf6c .config console log report syz C ci-upstream-kmsan-gce
2018/04/20 18:03 https://github.com/google/kmsan.git master 48c6a2b0ab1b cc402841 .config console log report syz C ci-upstream-kmsan-gce
2018/04/19 22:07 https://github.com/google/kmsan.git master 48c6a2b0ab1b 3642839c .config console log report syz C ci-upstream-kmsan-gce
2018/04/19 19:28 https://github.com/google/kmsan.git master 48c6a2b0ab1b 3642839c .config console log report syz C ci-upstream-kmsan-gce
2018/04/19 17:28 https://github.com/google/kmsan.git master 48c6a2b0ab1b 3642839c .config console log report syz C ci-upstream-kmsan-gce
2018/04/19 16:05 https://github.com/google/kmsan.git master 48c6a2b0ab1b 3642839c .config console log report syz C ci-upstream-kmsan-gce
2018/04/17 18:51 https://github.com/google/kmsan.git master 48c6a2b0ab1b b80fd3b5 .config console log report syz C ci-upstream-kmsan-gce
2018/04/17 08:24 https://github.com/google/kmsan.git master 48c6a2b0ab1b b80fd3b5 .config console log report syz C ci-upstream-kmsan-gce
2018/04/16 18:42 https://github.com/google/kmsan.git master 48c6a2b0ab1b 802ac912 .config console log report syz C ci-upstream-kmsan-gce
2018/04/15 08:47 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report syz C ci-upstream-kmsan-gce
2018/04/07 20:52 https://github.com/google/kmsan.git master e2ab7e8abba4 66f22a7f .config console log report syz C ci-upstream-kmsan-gce
2018/04/22 15:30 https://github.com/google/kmsan.git master a7f95e9c8a95 d23fcf6c .config console log report ci-upstream-kmsan-gce
2018/04/22 04:21 https://github.com/google/kmsan.git master a7f95e9c8a95 d23fcf6c .config console log report ci-upstream-kmsan-gce
2018/04/21 23:34 https://github.com/google/kmsan.git master a7f95e9c8a95 d23fcf6c .config console log report ci-upstream-kmsan-gce
2018/04/21 19:15 https://github.com/google/kmsan.git master a7f95e9c8a95 d23fcf6c .config console log report ci-upstream-kmsan-gce
2018/04/21 15:14 https://github.com/google/kmsan.git master a7f95e9c8a95 d23fcf6c .config console log report ci-upstream-kmsan-gce
2018/04/20 16:30 https://github.com/google/kmsan.git master 48c6a2b0ab1b cc402841 .config console log report ci-upstream-kmsan-gce
2018/04/20 07:48 https://github.com/google/kmsan.git master 48c6a2b0ab1b eae05cb0 .config console log report ci-upstream-kmsan-gce
2018/04/19 13:03 https://github.com/google/kmsan.git master 48c6a2b0ab1b 3642839c .config console log report ci-upstream-kmsan-gce
2018/04/18 15:19 https://github.com/google/kmsan.git master 48c6a2b0ab1b 52643b44 .config console log report ci-upstream-kmsan-gce
2018/04/16 10:50 https://github.com/google/kmsan.git master 48c6a2b0ab1b 802ac912 .config console log report ci-upstream-kmsan-gce
2018/04/13 21:26 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report ci-upstream-kmsan-gce
2018/04/13 17:40 https://github.com/google/kmsan.git master 35ff515e4bda 0a0c5db6 .config console log report ci-upstream-kmsan-gce
2018/04/13 16:13 https://github.com/google/kmsan.git master 35ff515e4bda 0a0c5db6 .config console log report ci-upstream-kmsan-gce
2018/04/13 13:01 https://github.com/google/kmsan.git master 35ff515e4bda 0a0c5db6 .config console log report ci-upstream-kmsan-gce
2018/04/13 09:01 https://github.com/google/kmsan.git master 35ff515e4bda 0a0c5db6 .config console log report ci-upstream-kmsan-gce
2018/04/12 19:11 https://github.com/google/kmsan.git master 35ff515e4bda eb2295de .config console log report ci-upstream-kmsan-gce
2018/04/12 17:55 https://github.com/google/kmsan.git master 35ff515e4bda eb2295de .config console log report ci-upstream-kmsan-gce
2018/04/11 12:33 https://github.com/google/kmsan.git master 35ff515e4bda 8b8de427 .config console log report ci-upstream-kmsan-gce
2018/04/10 11:06 https://github.com/google/kmsan.git master 35ff515e4bda b9f65507 .config console log report ci-upstream-kmsan-gce
2018/04/09 20:51 https://github.com/google/kmsan.git master e2ab7e8abba4 b9f65507 .config console log report ci-upstream-kmsan-gce
2018/04/09 17:55 https://github.com/google/kmsan.git master e2ab7e8abba4 f13fb445 .config console log report ci-upstream-kmsan-gce
2018/04/09 16:18 https://github.com/google/kmsan.git master e2ab7e8abba4 f13fb445 .config console log report ci-upstream-kmsan-gce
2018/04/09 05:24 https://github.com/google/kmsan.git master e2ab7e8abba4 77bd5117 .config console log report ci-upstream-kmsan-gce
2018/04/08 21:41 https://github.com/google/kmsan.git master e2ab7e8abba4 77bd5117 .config console log report ci-upstream-kmsan-gce
2018/04/08 11:19 https://github.com/google/kmsan.git master e2ab7e8abba4 66f22a7f .config console log report ci-upstream-kmsan-gce
2018/04/07 23:51 https://github.com/google/kmsan.git master e2ab7e8abba4 66f22a7f .config console log report ci-upstream-kmsan-gce
2018/04/07 17:29 https://github.com/google/kmsan.git master e2ab7e8abba4 66f22a7f .config console log report ci-upstream-kmsan-gce
2018/04/07 15:51 https://github.com/google/kmsan.git master e2ab7e8abba4 66f22a7f .config console log report ci-upstream-kmsan-gce
2018/04/06 23:50 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
2018/04/06 23:47 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
2018/04/06 23:47 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
2018/04/06 23:44 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
2018/04/06 23:44 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
2018/04/06 23:41 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
2018/04/06 23:41 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
2018/04/06 23:41 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
2018/04/06 23:33 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
2018/04/06 23:31 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
2018/04/06 23:31 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
2018/04/06 23:31 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
2018/04/06 23:00 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.