linux-kernel - KMSAN: uninit-value in tipc_nl_compat_name_table

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Date:   Thu, 28 Mar 2019 09:25:05 -0700
From:   syzbot <syzbot+3ce8520484b0d4e260a5@...kaller.appspotmail.com>
To:     davem@...emloft.net, glider@...gle.com, jon.maloy@...csson.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com,
        tipc-discussion@...ts.sourceforge.net, ying.xue@...driver.com
Subject: KMSAN: uninit-value in tipc_nl_compat_name_table_dump (2)

Hello,

syzbot found the following crash on:

HEAD commit:    a695dc5e kmsan: fixup mm/sl[au]b.[ch] after rebase
git tree:       kmsan
console output: https://syzkaller.appspot.com/x/log.txt?x=1683e04d200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a5675814e8eae69e
dashboard link: https://syzkaller.appspot.com/bug?extid=3ce8520484b0d4e260a5
compiler:       clang version 8.0.0 (trunk 350509)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15bdf95f200000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11b5a4cf200000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+3ce8520484b0d4e260a5@...kaller.appspotmail.com

sshd (11234) used greatest stack depth: 54160 bytes left
==================================================================
BUG: KMSAN: uninit-value in __arch_swab32  
arch/x86/include/uapi/asm/swab.h:10 [inline]
BUG: KMSAN: uninit-value in __fswab32 include/uapi/linux/swab.h:59 [inline]
BUG: KMSAN: uninit-value in tipc_nl_compat_name_table_dump+0x54f/0xcd0  
net/tipc/netlink_compat.c:872
CPU: 1 PID: 11248 Comm: syz-executor646 Not tainted 5.0.0+ #11
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+0x173/0x1d0 lib/dump_stack.c:113
  kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:600
  __msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:313
  __arch_swab32 arch/x86/include/uapi/asm/swab.h:10 [inline]
  __fswab32 include/uapi/linux/swab.h:59 [inline]
  tipc_nl_compat_name_table_dump+0x54f/0xcd0 net/tipc/netlink_compat.c:872
  __tipc_nl_compat_dumpit+0x59e/0xda0 net/tipc/netlink_compat.c:215
  tipc_nl_compat_dumpit+0x63a/0x820 net/tipc/netlink_compat.c:280
  tipc_nl_compat_handle net/tipc/netlink_compat.c:1226 [inline]
  tipc_nl_compat_recv+0x1b5f/0x2750 net/tipc/netlink_compat.c:1265
  genl_family_rcv_msg net/netlink/genetlink.c:601 [inline]
  genl_rcv_msg+0x185f/0x1a60 net/netlink/genetlink.c:626
  netlink_rcv_skb+0x431/0x620 net/netlink/af_netlink.c:2477
  genl_rcv+0x63/0x80 net/netlink/genetlink.c:637
  netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
  netlink_unicast+0xf3e/0x1020 net/netlink/af_netlink.c:1336
  netlink_sendmsg+0x127f/0x1300 net/netlink/af_netlink.c:1917
  sock_sendmsg_nosec net/socket.c:622 [inline]
  sock_sendmsg net/socket.c:632 [inline]
  ___sys_sendmsg+0xdb9/0x11b0 net/socket.c:2115
  __sys_sendmsg net/socket.c:2153 [inline]
  __do_sys_sendmsg net/socket.c:2162 [inline]
  __se_sys_sendmsg+0x305/0x460 net/socket.c:2160
  __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2160
  do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
  entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x444069
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 1b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffda17b3718 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444069
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 00000000006ce018 R08: 0000000000000000 R09: 00000000004002e0
R10: 0000000000001900 R11: 0000000000000246 R12: 0000000000401d10
R13: 0000000000401da0 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
  kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline]
  kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:159
  kmsan_kmalloc+0xa6/0x130 mm/kmsan/kmsan_hooks.c:176
  kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:185
  slab_post_alloc_hook mm/slab.h:445 [inline]
  slab_alloc_node mm/slub.c:2773 [inline]
  __kmalloc_node_track_caller+0xe9e/0xff0 mm/slub.c:4398
  __kmalloc_reserve net/core/skbuff.c:140 [inline]
  __alloc_skb+0x309/0xa20 net/core/skbuff.c:208
  alloc_skb include/linux/skbuff.h:1012 [inline]
  netlink_alloc_large_skb net/netlink/af_netlink.c:1182 [inline]
  netlink_sendmsg+0xb82/0x1300 net/netlink/af_netlink.c:1892
  sock_sendmsg_nosec net/socket.c:622 [inline]
  sock_sendmsg net/socket.c:632 [inline]
  ___sys_sendmsg+0xdb9/0x11b0 net/socket.c:2115
  __sys_sendmsg net/socket.c:2153 [inline]
  __do_sys_sendmsg net/socket.c:2162 [inline]
  __se_sys_sendmsg+0x305/0x460 net/socket.c:2160
  __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2160
  do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
  entry_SYSCALL_64_after_hwframe+0x63/0xe7
==================================================================


---
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