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KMSAN: kernel-infoleak in snd_pcm_oss_read (2)

Status: closed as invalid on 2018/09/12 11:11
Subsystems: sound
[Documentation on labels]
First crash: 2112d, last: 2112d
▶ ▼ Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: kernel-infoleak in snd_pcm_oss_read sound C 922 2112d 2123d 0/26 closed as invalid on 2018/07/13 10:28
upstream KMSAN: kernel-infoleak in snd_pcm_oss_read (3) sound C 14 1880d 1930d 0/26 closed as invalid on 2019/03/28 15:13

Sample crash report:
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
==================================================================
BUG: KMSAN: kernel-infoleak in copy_to_user include/linux/uaccess.h:184 [inline]
BUG: KMSAN: kernel-infoleak in snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1522 [inline]
BUG: KMSAN: kernel-infoleak in snd_pcm_oss_read+0x7cf/0x1b80 sound/core/oss/pcm_oss.c:2752
CPU: 1 PID: 4616 Comm: syz-executor518 Not tainted 4.18.0-rc4+ #26
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+0x185/0x1e0 lib/dump_stack.c:113
 kmsan_report+0x195/0x2c0 mm/kmsan/kmsan.c:1092
 kmsan_internal_check_memory+0x18e/0x210 mm/kmsan/kmsan.c:1156
 kmsan_copy_to_user+0x83/0xe0 mm/kmsan/kmsan_hooks.c:479
 copy_to_user include/linux/uaccess.h:184 [inline]
 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1522 [inline]
 snd_pcm_oss_read+0x7cf/0x1b80 sound/core/oss/pcm_oss.c:2752
 do_loop_readv_writev fs/read_write.c:700 [inline]
 do_iter_read+0xb87/0xd80 fs/read_write.c:924
 vfs_readv fs/read_write.c:986 [inline]
 do_readv+0x2aa/0x630 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:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x440099
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007fff7c36cd08 EFLAGS: 00000213 ORIG_RAX: 0000000000000013
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440099
RDX: 0000000000000005 RSI: 00000000200011c0 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401920
R13: 00000000004019b0 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline]
 kmsan_internal_alloc_meta_for_pages+0x157/0x730 mm/kmsan/kmsan.c:804
 kmsan_alloc_page+0x80/0xe0 mm/kmsan/kmsan_hooks.c:250
 __alloc_pages_nodemask+0x105b/0x6320 mm/page_alloc.c:4409
 alloc_pages_current+0x6b1/0x970 mm/mempolicy.c:2093
 alloc_pages include/linux/gfp.h:494 [inline]
 __vmalloc_area_node mm/vmalloc.c:1689 [inline]
 __vmalloc_node_range+0x8bf/0x1170 mm/vmalloc.c:1754
 __vmalloc_node mm/vmalloc.c:1799 [inline]
 __vmalloc_node_flags mm/vmalloc.c:1813 [inline]
 vmalloc+0xd8/0xf0 mm/vmalloc.c:1835
 snd_pcm_oss_change_params_locked+0x6597/0x6bf0 sound/core/oss/pcm_oss.c:1066
 snd_pcm_oss_make_ready_locked sound/core/oss/pcm_oss.c:1183 [inline]
 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1507 [inline]
 snd_pcm_oss_read+0x4d0/0x1b80 sound/core/oss/pcm_oss.c:2752
 do_loop_readv_writev fs/read_write.c:700 [inline]
 do_iter_read+0x884/0xd80 fs/read_write.c:924
 vfs_readv fs/read_write.c:986 [inline]
 do_readv+0x2aa/0x630 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:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Bytes 0-60 of 61 are uninitialized
Memory access starts at ffffc900018ab000
==================================================================

Crashes (26):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/07/13 12:14 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report syz C ci-upstream-kmsan-gce
2018/07/13 23:53 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 23:42 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 22:54 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 22:00 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 21:33 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 20:47 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 19:18 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 19:03 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 18:49 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 17:37 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 17:16 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 17:10 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 17:10 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 16:46 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 16:12 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 16:07 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 14:40 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 14:19 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 13:26 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 13:12 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 12:41 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 12:40 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 12:31 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 12:03 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 11:53 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.