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KMSAN: uninit-value in csum_partial_copy_to_user

Status: closed as invalid on 2018/06/27 15:08
Subsystems: kernel
[Documentation on labels]
First crash: 2705d, last: 2691d

Sample crash report:
==================================================================
BUG: KMSAN: uninit-value in add32_with_carry arch/x86/include/asm/checksum_64.h:185 [inline]
BUG: KMSAN: uninit-value in csum_partial_copy_to_user+0x450/0x500 arch/x86/lib/csum-wrappers_64.c:101
CPU: 1 PID: 9100 Comm: syz-executor0 Not tainted 4.16.0+ #84
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
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676
 add32_with_carry arch/x86/include/asm/checksum_64.h:185 [inline]
 csum_partial_copy_to_user+0x450/0x500 arch/x86/lib/csum-wrappers_64.c:101
 csum_and_copy_to_iter+0x3dc/0x2140 lib/iov_iter.c:1283
 skb_copy_and_csum_datagram+0x6d2/0x1080 net/core/datagram.c:685
 skb_copy_and_csum_datagram_msg+0x557/0x960 net/core/datagram.c:802
 udpv6_recvmsg+0xc65/0x29e0 net/ipv6/udp.c:374
 inet_recvmsg+0x4c2/0x5f0 net/ipv4/af_inet.c:796
 sock_recvmsg_nosec net/socket.c:803 [inline]
 sock_recvmsg net/socket.c:810 [inline]
 sock_read_iter+0x405/0x480 net/socket.c:887
 do_iter_readv_writev+0x7bb/0x970 include/linux/fs.h:1776
 do_iter_read+0x303/0xd70 fs/read_write.c:895
 vfs_readv fs/read_write.c:959 [inline]
 do_readv+0x295/0x5f0 fs/read_write.c:992
 SYSC_readv+0x9b/0xb0 fs/read_write.c:1079
 SyS_readv+0x56/0x80 fs/read_write.c:1076
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x455389
RSP: 002b:00007f654ef60c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000013
RAX: ffffffffffffffda RBX: 00007f654ef616d4 RCX: 0000000000455389
RDX: 0000000000000001 RSI: 0000000020000b00 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000495 R14: 00000000006f9e98 R15: 0000000000000000

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_current+0x6b5/0x970 mm/mempolicy.c:2055
 alloc_pages include/linux/gfp.h:494 [inline]
 skb_page_frag_refill+0x3ba/0x5e0 net/core/sock.c:2208
 sk_page_frag_refill+0xa4/0x340 net/core/sock.c:2228
 __ip6_append_data+0x1a20/0x4bb0 net/ipv6/ip6_output.c:1503
 ip6_append_data+0x40e/0x6b0 net/ipv6/ip6_output.c:1576
 udpv6_sendmsg+0xfd5/0x45b0 net/ipv6/udp.c:1337
 inet_sendmsg+0x48d/0x740 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg net/socket.c:640 [inline]
 ___sys_sendmsg+0xec0/0x1310 net/socket.c:2046
 __sys_sendmsg net/socket.c:2080 [inline]
 SYSC_sendmsg+0x2a3/0x3d0 net/socket.c:2091
 SyS_sendmsg+0x54/0x80 net/socket.c:2087
 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x3d/0xa2
==================================================================

Crashes (49):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/04/21 06:18 https://github.com/google/kmsan.git master 48c6a2b0ab1b ca03d688 .config console log report ci-upstream-kmsan-gce
2018/04/20 20:40 https://github.com/google/kmsan.git master 48c6a2b0ab1b cc402841 .config console log report ci-upstream-kmsan-gce
2018/04/20 18:01 https://github.com/google/kmsan.git master 48c6a2b0ab1b cc402841 .config console log report ci-upstream-kmsan-gce
2018/04/20 16:57 https://github.com/google/kmsan.git master 48c6a2b0ab1b cc402841 .config console log report ci-upstream-kmsan-gce
2018/04/20 15:17 https://github.com/google/kmsan.git master 48c6a2b0ab1b cc402841 .config console log report ci-upstream-kmsan-gce
2018/04/20 13:18 https://github.com/google/kmsan.git master 48c6a2b0ab1b cc402841 .config console log report ci-upstream-kmsan-gce
2018/04/19 14:24 https://github.com/google/kmsan.git master 48c6a2b0ab1b 3642839c .config console log report ci-upstream-kmsan-gce
2018/04/19 09:33 https://github.com/google/kmsan.git master 48c6a2b0ab1b d1b2ef69 .config console log report ci-upstream-kmsan-gce
2018/04/18 16:01 https://github.com/google/kmsan.git master 48c6a2b0ab1b 52643b44 .config console log report ci-upstream-kmsan-gce
2018/04/18 13:57 https://github.com/google/kmsan.git master 48c6a2b0ab1b 52643b44 .config console log report ci-upstream-kmsan-gce
2018/04/18 06:02 https://github.com/google/kmsan.git master 48c6a2b0ab1b b80fd3b5 .config console log report ci-upstream-kmsan-gce
2018/04/16 23:07 https://github.com/google/kmsan.git master 48c6a2b0ab1b b80fd3b5 .config console log report ci-upstream-kmsan-gce
2018/04/16 23:03 https://github.com/google/kmsan.git master 48c6a2b0ab1b b80fd3b5 .config console log report ci-upstream-kmsan-gce
2018/04/16 16:59 https://github.com/google/kmsan.git master 48c6a2b0ab1b 802ac912 .config console log report ci-upstream-kmsan-gce
2018/04/16 15:35 https://github.com/google/kmsan.git master 48c6a2b0ab1b 802ac912 .config console log report ci-upstream-kmsan-gce
2018/04/16 11:11 https://github.com/google/kmsan.git master 48c6a2b0ab1b 802ac912 .config console log report ci-upstream-kmsan-gce
2018/04/16 06:51 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report ci-upstream-kmsan-gce
2018/04/16 06:48 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report ci-upstream-kmsan-gce
2018/04/16 00:21 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report ci-upstream-kmsan-gce
2018/04/14 14:11 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report ci-upstream-kmsan-gce
2018/04/14 07:34 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report ci-upstream-kmsan-gce
2018/04/14 04:39 https://github.com/google/kmsan.git master 35ff515e4bda 7a67784c .config console log report ci-upstream-kmsan-gce
2018/04/13 18:42 https://github.com/google/kmsan.git master 35ff515e4bda 0a0c5db6 .config console log report ci-upstream-kmsan-gce
2018/04/13 16:04 https://github.com/google/kmsan.git master 35ff515e4bda 0a0c5db6 .config console log report ci-upstream-kmsan-gce
2018/04/13 14:39 https://github.com/google/kmsan.git master 35ff515e4bda 0a0c5db6 .config console log report ci-upstream-kmsan-gce
2018/04/13 12:02 https://github.com/google/kmsan.git master 35ff515e4bda 0a0c5db6 .config console log report ci-upstream-kmsan-gce
2018/04/13 10:19 https://github.com/google/kmsan.git master 35ff515e4bda 0a0c5db6 .config console log report ci-upstream-kmsan-gce
2018/04/12 13:07 https://github.com/google/kmsan.git master 35ff515e4bda 9cd56d71 .config console log report ci-upstream-kmsan-gce
2018/04/12 13:06 https://github.com/google/kmsan.git master 35ff515e4bda 9cd56d71 .config console log report ci-upstream-kmsan-gce
2018/04/11 22:05 https://github.com/google/kmsan.git master 35ff515e4bda 9cd56d71 .config console log report ci-upstream-kmsan-gce
2018/04/11 22:01 https://github.com/google/kmsan.git master 35ff515e4bda 9cd56d71 .config console log report ci-upstream-kmsan-gce
2018/04/11 19:48 https://github.com/google/kmsan.git master 35ff515e4bda 8b8de427 .config console log report ci-upstream-kmsan-gce
2018/04/11 13:57 https://github.com/google/kmsan.git master 35ff515e4bda 8b8de427 .config console log report ci-upstream-kmsan-gce
2018/04/11 12:52 https://github.com/google/kmsan.git master 35ff515e4bda 8b8de427 .config console log report ci-upstream-kmsan-gce
2018/04/11 11:46 https://github.com/google/kmsan.git master 35ff515e4bda 8b8de427 .config console log report ci-upstream-kmsan-gce
2018/04/09 20:52 https://github.com/google/kmsan.git master e2ab7e8abba4 b9f65507 .config console log report ci-upstream-kmsan-gce
2018/04/08 13:27 https://github.com/google/kmsan.git master e2ab7e8abba4 77bd5117 .config console log report ci-upstream-kmsan-gce
2018/04/08 05:52 https://github.com/google/kmsan.git master e2ab7e8abba4 66f22a7f .config console log report ci-upstream-kmsan-gce
2018/04/07 21:42 https://github.com/google/kmsan.git master e2ab7e8abba4 66f22a7f .config console log report ci-upstream-kmsan-gce
2018/04/07 21:40 https://github.com/google/kmsan.git master e2ab7e8abba4 66f22a7f .config console log report ci-upstream-kmsan-gce
2018/04/07 21:39 https://github.com/google/kmsan.git master e2ab7e8abba4 66f22a7f .config console log report ci-upstream-kmsan-gce
2018/04/07 06:50 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
2018/04/07 06:01 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
2018/04/07 02:55 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
2018/04/07 02:22 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
2018/04/07 00:46 https://github.com/google/kmsan.git master e2ab7e8abba4 d613535f .config console log report ci-upstream-kmsan-gce
2018/04/07 00:37 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.