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KMSAN: kernel-infoleak in copy_page_to_iter

Status: closed as invalid on 2018/06/29 17:28
Subsystems: fs
[Documentation on labels]
First crash: 2426d, last: 2405d
▶ ▼ Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: kernel-infoleak in copy_page_to_iter (3) block 2 1157d 1159d 0/28 auto-closed as invalid on 2022/02/26 03:22
upstream KMSAN: kernel-infoleak in copy_page_to_iter (2) fs mm C 2099 1271d 2329d 20/28 fixed on 2021/11/10 00:50
upstream KMSAN: kernel-infoleak in _copy_to_iter (8) mm C 21180 600d 694d 22/28 fixed on 2023/06/08 14:41
upstream KMSAN: kernel-infoleak in copy_page_to_iter (4) block 252 512d 591d 0/28 auto-obsoleted due to no activity on 2023/11/13 05:38

Sample crash report:
random: sshd: uninitialized urandom read (32 bytes read)
==================================================================
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: 4533 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: 0033:0x7fc139011310
RSP: 002b:00007ffecd6f1018 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc139011310
RDX: 0000000000000100 RSI: 00000000017ffdf8 RDI: 0000000000000003
RBP: 00000000017ffdd0 R08: 0000000000000028 R09: 0000000001680000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000017ff030
R13: 0000000000000100 R14: 00000000017ff080 R15: 00000000017ffde8

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_pwritev+0x480/0x7a0 fs/read_write.c:1093
 __do_sys_pwritev fs/read_write.c:1140 [inline]
 __se_sys_pwritev fs/read_write.c:1135 [inline]
 __x64_sys_pwritev+0x120/0x170 fs/read_write.c:1135
 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 ffff8801c6718000
==================================================================

Crashes (364):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/06/26 19:10 https://github.com/google/kmsan.git master 123906095e30 b0294c53 .config console log report syz C ci-upstream-kmsan-gce
2018/06/22 14:38 https://github.com/google/kmsan.git master 123906095e30 095ef806 .config console log report syz C ci-upstream-kmsan-gce
2018/06/08 14:34 https://github.com/google/kmsan.git master 6456f940990e f7b27b7a .config console log report syz C ci-upstream-kmsan-gce
2018/06/29 17:24 https://github.com/google/kmsan.git master 123906095e30 dba0b50e .config console log report ci-upstream-kmsan-gce
2018/06/29 14:59 https://github.com/google/kmsan.git master 123906095e30 dba0b50e .config console log report ci-upstream-kmsan-gce
2018/06/29 13:05 https://github.com/google/kmsan.git master 123906095e30 dba0b50e .config console log report ci-upstream-kmsan-gce
2018/06/29 06:38 https://github.com/google/kmsan.git master 123906095e30 dba0b50e .config console log report ci-upstream-kmsan-gce
2018/06/29 05:30 https://github.com/google/kmsan.git master 123906095e30 dba0b50e .config console log report ci-upstream-kmsan-gce
2018/06/29 03:40 https://github.com/google/kmsan.git master 123906095e30 dba0b50e .config console log report ci-upstream-kmsan-gce
2018/06/29 00:08 https://github.com/google/kmsan.git master 123906095e30 dba0b50e .config console log report ci-upstream-kmsan-gce
2018/06/28 20:51 https://github.com/google/kmsan.git master 123906095e30 dba0b50e .config console log report ci-upstream-kmsan-gce
2018/06/28 18:34 https://github.com/google/kmsan.git master 123906095e30 dba0b50e .config console log report ci-upstream-kmsan-gce
2018/06/28 14:29 https://github.com/google/kmsan.git master 123906095e30 dba0b50e .config console log report ci-upstream-kmsan-gce
2018/06/28 11:29 https://github.com/google/kmsan.git master 123906095e30 dba0b50e .config console log report ci-upstream-kmsan-gce
2018/06/28 09:57 https://github.com/google/kmsan.git master 123906095e30 dba0b50e .config console log report ci-upstream-kmsan-gce
2018/06/28 07:35 https://github.com/google/kmsan.git master 123906095e30 43e60f7e .config console log report ci-upstream-kmsan-gce
2018/06/28 03:24 https://github.com/google/kmsan.git master 123906095e30 43e60f7e .config console log report ci-upstream-kmsan-gce
2018/06/28 01:37 https://github.com/google/kmsan.git master 123906095e30 43e60f7e .config console log report ci-upstream-kmsan-gce
2018/06/28 00:37 https://github.com/google/kmsan.git master 123906095e30 43e60f7e .config console log report ci-upstream-kmsan-gce
2018/06/27 23:16 https://github.com/google/kmsan.git master 123906095e30 43e60f7e .config console log report ci-upstream-kmsan-gce
2018/06/27 20:07 https://github.com/google/kmsan.git master 123906095e30 43e60f7e .config console log report ci-upstream-kmsan-gce
2018/06/27 17:55 https://github.com/google/kmsan.git master 123906095e30 43e60f7e .config console log report ci-upstream-kmsan-gce
2018/06/27 15:57 https://github.com/google/kmsan.git master 123906095e30 43e60f7e .config console log report ci-upstream-kmsan-gce
2018/06/27 13:47 https://github.com/google/kmsan.git master 123906095e30 43e60f7e .config console log report ci-upstream-kmsan-gce
2018/06/27 11:08 https://github.com/google/kmsan.git master 123906095e30 43e60f7e .config console log report ci-upstream-kmsan-gce
2018/06/27 08:53 https://github.com/google/kmsan.git master 123906095e30 43e60f7e .config console log report ci-upstream-kmsan-gce
2018/06/27 07:46 https://github.com/google/kmsan.git master 123906095e30 b0294c53 .config console log report ci-upstream-kmsan-gce
2018/06/27 03:43 https://github.com/google/kmsan.git master 123906095e30 b0294c53 .config console log report ci-upstream-kmsan-gce
2018/06/27 01:11 https://github.com/google/kmsan.git master 123906095e30 b0294c53 .config console log report ci-upstream-kmsan-gce
2018/06/26 21:11 https://github.com/google/kmsan.git master 123906095e30 b0294c53 .config console log report ci-upstream-kmsan-gce
2018/06/26 19:06 https://github.com/google/kmsan.git master 123906095e30 b0294c53 .config console log report ci-upstream-kmsan-gce
2018/06/26 17:30 https://github.com/google/kmsan.git master 123906095e30 b0294c53 .config console log report ci-upstream-kmsan-gce
2018/06/26 15:50 https://github.com/google/kmsan.git master 123906095e30 b0294c53 .config console log report ci-upstream-kmsan-gce
2018/06/26 10:33 https://github.com/google/kmsan.git master 123906095e30 2064fc5c .config console log report ci-upstream-kmsan-gce
2018/06/26 07:42 https://github.com/google/kmsan.git master 123906095e30 2064fc5c .config console log report ci-upstream-kmsan-gce
2018/06/26 06:30 https://github.com/google/kmsan.git master 123906095e30 2064fc5c .config console log report ci-upstream-kmsan-gce
2018/06/26 05:24 https://github.com/google/kmsan.git master 123906095e30 2064fc5c .config console log report ci-upstream-kmsan-gce
2018/06/26 03:33 https://github.com/google/kmsan.git master 123906095e30 2064fc5c .config console log report ci-upstream-kmsan-gce
2018/06/25 22:23 https://github.com/google/kmsan.git master 123906095e30 2064fc5c .config console log report ci-upstream-kmsan-gce
2018/06/25 19:47 https://github.com/google/kmsan.git master 123906095e30 2064fc5c .config console log report ci-upstream-kmsan-gce
2018/06/25 04:52 https://github.com/google/kmsan.git master 123906095e30 2064fc5c .config console log report ci-upstream-kmsan-gce
2018/06/24 21:21 https://github.com/google/kmsan.git master 123906095e30 2064fc5c .config console log report ci-upstream-kmsan-gce
2018/06/24 15:16 https://github.com/google/kmsan.git master 123906095e30 2064fc5c .config console log report ci-upstream-kmsan-gce
2018/06/24 13:16 https://github.com/google/kmsan.git master 123906095e30 2064fc5c .config console log report ci-upstream-kmsan-gce
2018/06/24 09:43 https://github.com/google/kmsan.git master 123906095e30 2064fc5c .config console log report ci-upstream-kmsan-gce
2018/06/24 08:26 https://github.com/google/kmsan.git master 123906095e30 2064fc5c .config console log report ci-upstream-kmsan-gce
2018/06/08 13:16 https://github.com/google/kmsan.git master 6456f940990e f7b27b7a .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.