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KMSAN: uninit-value in move_addr_to_user (2)

Status: fixed on 2018/05/17 10:02
Subsystems: net
[Documentation on labels]
Fix commit: 09c8b9718a7a tipc: fix one byte leak in tipc_sk_set_orig_addr()
First crash: 2171d, last: 2164d
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in move_addr_to_user net C 74 2172d 2203d 5/26 fixed on 2018/05/08 18:30

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: uninit-value in copy_to_user include/linux/uaccess.h:184 [inline]
BUG: KMSAN: uninit-value in move_addr_to_user+0x32e/0x530 net/socket.c:226
CPU: 0 PID: 4549 Comm: syz-executor287 Not tainted 4.17.0-rc3+ #88
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+0x142/0x240 mm/kmsan/kmsan.c:1067
 kmsan_internal_check_memory+0x135/0x1e0 mm/kmsan/kmsan.c:1157
 kmsan_copy_to_user+0x69/0x160 mm/kmsan/kmsan.c:1199
 copy_to_user include/linux/uaccess.h:184 [inline]
 move_addr_to_user+0x32e/0x530 net/socket.c:226
 ___sys_recvmsg+0x4e2/0x810 net/socket.c:2285
 __sys_recvmsg net/socket.c:2328 [inline]
 __do_sys_recvmsg net/socket.c:2338 [inline]
 __se_sys_recvmsg net/socket.c:2335 [inline]
 __x64_sys_recvmsg+0x325/0x460 net/socket.c:2335
 do_syscall_64+0x154/0x220 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4455e9
RSP: 002b:00007fe3bd36ddb8 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 00000000004455e9
RDX: 0000000000002002 RSI: 0000000020000400 RDI: 0000000000000003
RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff98ce4b6f R14: 00007fe3bd36e9c0 R15: 0000000000000003

Local variable description: ----addr@___sys_recvmsg
Variable was created at:
 ___sys_recvmsg+0xd5/0x810 net/socket.c:2246
 __sys_recvmsg net/socket.c:2328 [inline]
 __do_sys_recvmsg net/socket.c:2338 [inline]
 __se_sys_recvmsg net/socket.c:2335 [inline]
 __x64_sys_recvmsg+0x325/0x460 net/socket.c:2335

Byte 19 of 32 is uninitialized
==================================================================

Crashes (44):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/05/09 07:03 https://github.com/google/kmsan.git master 74ee2200b89f b88872ba .config console log report syz C ci-upstream-kmsan-gce
2018/05/16 07:30 https://github.com/google/kmsan.git master 06b2df0593a8 68ce85f1 .config console log report ci-upstream-kmsan-gce
2018/05/15 22:31 https://github.com/google/kmsan.git master 06b2df0593a8 68ce85f1 .config console log report ci-upstream-kmsan-gce
2018/05/15 19:51 https://github.com/google/kmsan.git master 1df165c8d2d6 661fd7b9 .config console log report ci-upstream-kmsan-gce
2018/05/15 19:48 https://github.com/google/kmsan.git master 1df165c8d2d6 661fd7b9 .config console log report ci-upstream-kmsan-gce
2018/05/15 19:47 https://github.com/google/kmsan.git master 1df165c8d2d6 661fd7b9 .config console log report ci-upstream-kmsan-gce
2018/05/15 19:47 https://github.com/google/kmsan.git master 1df165c8d2d6 661fd7b9 .config console log report ci-upstream-kmsan-gce
2018/05/15 19:47 https://github.com/google/kmsan.git master 1df165c8d2d6 661fd7b9 .config console log report ci-upstream-kmsan-gce
2018/05/15 18:18 https://github.com/google/kmsan.git master 1df165c8d2d6 661fd7b9 .config console log report ci-upstream-kmsan-gce
2018/05/15 17:37 https://github.com/google/kmsan.git master 1df165c8d2d6 661fd7b9 .config console log report ci-upstream-kmsan-gce
2018/05/15 17:36 https://github.com/google/kmsan.git master 1df165c8d2d6 661fd7b9 .config console log report ci-upstream-kmsan-gce
2018/05/15 05:33 https://github.com/google/kmsan.git master 450487484278 d2284dda .config console log report ci-upstream-kmsan-gce
2018/05/15 00:34 https://github.com/google/kmsan.git master 450487484278 d2284dda .config console log report ci-upstream-kmsan-gce
2018/05/14 20:38 https://github.com/google/kmsan.git master 450487484278 d2284dda .config console log report ci-upstream-kmsan-gce
2018/05/14 16:48 https://github.com/google/kmsan.git master 9bad779decc0 9467cacb .config console log report ci-upstream-kmsan-gce
2018/05/14 05:50 https://github.com/google/kmsan.git master 9bad779decc0 481f030c .config console log report ci-upstream-kmsan-gce
2018/05/14 05:21 https://github.com/google/kmsan.git master 9bad779decc0 481f030c .config console log report ci-upstream-kmsan-gce
2018/05/13 14:21 https://github.com/google/kmsan.git master 9bad779decc0 c05b619d .config console log report ci-upstream-kmsan-gce
2018/05/13 09:13 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/12 23:28 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/12 22:28 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/12 18:41 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/12 18:06 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/12 18:04 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/12 13:55 https://github.com/google/kmsan.git master 74ee2200b89f e726f42b .config console log report ci-upstream-kmsan-gce
2018/05/12 04:55 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/12 04:53 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/12 03:37 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 19:43 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 12:07 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 08:07 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 05:15 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/11 00:53 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/10 22:28 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/10 22:05 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/10 19:59 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/10 17:10 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/10 16:29 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/10 12:19 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/10 01:55 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/10 01:04 https://github.com/google/kmsan.git master 74ee2200b89f 12c7428a .config console log report ci-upstream-kmsan-gce
2018/05/09 06:41 https://github.com/google/kmsan.git master 74ee2200b89f b88872ba .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.