Hello,
syzbot found the following crash on:
HEAD commit: e132c8d7 Linux 4.14.149
git tree: linux-4.14.y
console output:
https://syzkaller.appspot.com/x/log.txt?x=12ce133b600000
kernel config:
https://syzkaller.appspot.com/x/.config?x=65c18705ca007f2
dashboard link:
https://syzkaller.appspot.com/bug?extid=f4c424b510a718452d72
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:
https://syzkaller.appspot.com/x/repro.syz?x=11cd26d7600000
C reproducer:
https://syzkaller.appspot.com/x/repro.c?x=15b0fa30e00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by:
syzbot+f4c424...@syzkaller.appspotmail.com
random: sshd: uninitialized urandom read (32 bytes read)
audit: type=1400 audit(1571043757.987:36): avc: denied { map } for
pid=6969 comm="syz-executor323" path="/root/syz-executor323863313"
dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
==================================================================
BUG: unable to handle kernel NULL pointer dereference
BUG: KASAN: null-ptr-deref in memcpy include/linux/string.h:347 [inline]
BUG: KASAN: null-ptr-deref in llcp_sock_getname+0x38f/0x4a0
net/nfc/llcp_sock.c:532
Read of size 3 at addr (null) by task syz-executor323/6978
at (null)
IP: memcpy_erms+0x6/0x10 arch/x86/lib/memcpy_64.S:54
CPU: 0 PID: 6978 Comm: syz-executor323 Not tainted 4.14.149 #0
PGD 92f8b067
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
P4D 92f8b067
Call Trace:
PUD a63a2067
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x138/0x197 lib/dump_stack.c:53
PMD 0
kasan_report_error mm/kasan/report.c:349 [inline]
kasan_report mm/kasan/report.c:409 [inline]
kasan_report.cold+0x127/0x2af mm/kasan/report.c:393
Oops: 0000 [#1] PREEMPT SMP KASAN
check_memory_region_inline mm/kasan/kasan.c:260 [inline]
check_memory_region+0x123/0x190 mm/kasan/kasan.c:267
Modules linked in:
memcpy+0x24/0x50 mm/kasan/kasan.c:302
CPU: 1 PID: 6976 Comm: syz-executor323 Not tainted 4.14.149 #0
memcpy include/linux/string.h:347 [inline]
llcp_sock_getname+0x38f/0x4a0 net/nfc/llcp_sock.c:532
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
task: ffff8880938dc080 task.stack: ffff888099a30000
SYSC_getpeername+0x120/0x270 net/socket.c:1715
RIP: 0010:memcpy_erms+0x6/0x10 arch/x86/lib/memcpy_64.S:54
RSP: 0018:ffff888099a37d20 EFLAGS: 00010246
RAX: ffff888099a37e0a RBX: ffff888099a37df8 RCX: 0000000000000003
RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffff888099a37e0a
RBP: ffff888099a37d40 R08: 1ffff11013346fc1 R09: ffffed1013346fc2
R10: ffffed1013346fc1 R11: ffff888099a37e0c R12: 0000000000000003
R13: ffff888099a37e0a R14: 0000000000000000 R15: ffffffff87068700
FS: 0000000001b9d880(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000009bc15000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
memcpy include/linux/string.h:347 [inline]
llcp_sock_getname+0x38f/0x4a0 net/nfc/llcp_sock.c:532
SYSC_getpeername+0x120/0x270 net/socket.c:1715
SyS_getpeername+0x24/0x30 net/socket.c:1699
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
SyS_getpeername+0x24/0x30 net/socket.c:1699
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x441299
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
RSP: 002b:00007ffe6da2e4d8 EFLAGS: 00000246
ORIG_RAX: 0000000000000034
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441299
RIP: 0033:0x441299
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RSP: 002b:00007ffe6da2e4d8 EFLAGS: 00000246
RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8
ORIG_RAX: 0000000000000034
R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000402010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441299
R13: 00000000004020a0 R14: 0000000000000000 R15: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
Code:
RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8
90
R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000402010
90
R13: 00000000004020a0 R14: 0000000000000000 R15: 0000000000000000
90
==================================================================
90 90 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1
f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 <f3> a4 c3 0f 1f 80 00 00 00
00 48 89 f8 48 83 fa 20 72 7e 40 38
RIP: memcpy_erms+0x6/0x10 arch/x86/lib/memcpy_64.S:54 RSP: ffff888099a37d20
CR2: 0000000000000000
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: memcpy_erms+0x6/0x10 arch/x86/lib/memcpy_64.S:54
PGD 9bd05067 P4D 9bd05067 PUD a61c2067 PMD 0
Oops: 0000 [#2] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 7017 Comm: syz-executor323 Tainted: G B D 4.14.149 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
task: ffff8880a962a240 task.stack: ffff888098ad8000
RIP: 0010:memcpy_erms+0x6/0x10 arch/x86/lib/memcpy_64.S:54
RSP: 0018:ffff888098adfd20 EFLAGS: 00010246
RAX: ffff888098adfe0a RBX: ffff888098adfdf8 RCX: 0000000000000003
RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffff888098adfe0a
RBP: ffff888098adfd40 R08: 1ffff1101315bfc1 R09: ffffed101315bfc2
R10: ffffed101315bfc1 R11: ffff888098adfe0c R12: 0000000000000003
R13: ffff888098adfe0a R14: 0000000000000000 R15: ffffffff87068700
FS: 0000000001b9d880(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000009f4c3000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
memcpy include/linux/string.h:347 [inline]
llcp_sock_getname+0x38f/0x4a0 net/nfc/llcp_sock.c:532
SYSC_getpeername+0x120/0x270 net/socket.c:1715
SyS_getpeername+0x24/0x30 net/socket.c:1699
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x441299
RSP: 002b:00007ffe6da2e4d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000034
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441299
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 000000000000a209 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000402010
R13: 00000000004020a0 R14: 0000000000000000 R15: 0000000000000000
Code: 90 90 90 90 90 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07
f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 <f3> a4 c3 0f
1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38
RIP: memcpy_erms+0x6/0x10 arch/x86/lib/memcpy_64.S:54 RSP: ffff888098adfd20
CR2: 0000000000000000
BUG: unable to handle kernel NULL pointer dereference at (null)
---
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