Messages in this thread | | | From | Dmitry Vyukov <> | Date | Mon, 13 Feb 2017 16:14:39 +0100 | Subject | net/kcm: GPF in kcm_sendmsg |
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Hello,
The following program triggers GPF in kcm_sendmsg:
// autogenerated by syzkaller (http://github.com/google/syzkaller) #define _GNU_SOURCE #include <sys/socket.h> #include <sys/types.h> #include <sys/stat.h> #include <stddef.h> #include <string.h> #include <unistd.h>
int main() { int sock = socket(41 /*AF_KCM*/, SOCK_SEQPACKET, 0); struct mmsghdr msg; memset(&msg, 0, sizeof(msg)); sendmmsg(sock, &msg, 1, 0); return 0; }
general protection fault: 0000 [#1] SMP KASAN Modules linked in: CPU: 2 PID: 2935 Comm: a.out Not tainted 4.10.0-rc8+ #218 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff88006b506440 task.stack: ffff8800662b8000 RIP: 0010:kcm_sendmsg+0x92e/0x2240 net/kcm/kcmsock.c:1048 RSP: 0018:ffff8800662bf720 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000008 RSI: ffff88006b506c38 RDI: 0000000000000040 RBP: ffff8800662bfa00 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000006 R11: 0000000000000000 R12: 7fffffffffffffff R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88006af12040 FS: 0000000001077880(0000) GS:ffff88006d100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004b2140 CR3: 00000000651b7000 CR4: 00000000001406e0 Call Trace: sock_sendmsg_nosec net/socket.c:635 [inline] sock_sendmsg+0xca/0x110 net/socket.c:645 ___sys_sendmsg+0x4a3/0x9f0 net/socket.c:1985 __sys_sendmmsg+0x25c/0x750 net/socket.c:2075 SYSC_sendmmsg net/socket.c:2106 [inline] SyS_sendmmsg+0x35/0x60 net/socket.c:2101 entry_SYSCALL_64_fastpath+0x1f/0xc2 RIP: 0033:0x436dc9 RSP: 002b:00007ffe84e1a938 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000401730 RCX: 0000000000436dc9 RDX: 0000000000000001 RSI: 00007ffe84e1a950 RDI: 0000000000000003 RBP: 0000000000000000 R08: 000000000000000b R09: 0000000000000004 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004002b0 R13: 00007ffe84e1aa88 R14: 0000000000000002 R15: 0000000000000000 Code: 02 00 0f 85 d4 14 00 00 48 8b 85 c0 fd ff ff 48 8d 78 40 49 89 87 30 05 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 9d 14 00 00 48 8b 85 c0 fd ff ff 4c 89 70 40 RIP: kcm_sendmsg+0x92e/0x2240 net/kcm/kcmsock.c:1048 RSP: ffff8800662bf720 ---[ end trace 62093774c8609871 ]---
On commit 7089db84e356562f8ba737c29e472cc42d530dbc (4.10-rc8).
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