syzkaller login: [ 19.547699] kasan: CONFIG_KASAN_INLINE enabled executing program [ 19.548322] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.549458] general protection fault: 0000 [#1] SMP KASAN [ 19.550230] Dumping ftrace buffer: [ 19.550658] (ftrace buffer empty) [ 19.551089] Modules linked in: [ 19.551469] CPU: 3 PID: 2994 Comm: syzkaller383450 Not tainted 4.14.0-rc7-next-20171103+ #10 [ 19.554653] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 19.555570] task: ffff88003a7a43c0 task.stack: ffff88003d3f0000 [ 19.556221] RIP: 0010:asn1_ber_decoder+0x41e/0x1af0 [ 19.556677] RSP: 0018:ffff88003d3f78d0 EFLAGS: 00010246 [ 19.557265] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 19.557894] RDX: 0000000000000000 RSI: ffff88006ca17000 RDI: ffffffff853f1920 [ 19.558584] RBP: ffff88003d3f7b88 R08: 0000000000000060 R09: 0000000000000000 [ 19.559747] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 19.560408] R13: 0000000000000000 R14: ffff88003d3f7b60 R15: dffffc0000000000 [ 19.561029] FS: 0000000000940880(0000) GS:ffff88006df00000(0000) knlGS:0000000000000000 [ 19.561751] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 19.562299] CR2: 0000000020000000 CR3: 0000000069a0e000 CR4: 00000000000006e0 [ 19.562915] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.563604] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.564233] Call Trace: [ 19.564474] ? pkcs7_parse_message+0x18a/0x730 [ 19.564866] ? verify_pkcs7_signature+0x8d/0x290 [ 19.565303] ? pkcs7_preparse+0x7b/0xc0 [ 19.565652] ? depot_save_stack+0x490/0x490 [ 19.566030] ? __lock_is_held+0xbc/0x140 [ 19.566533] ? __lock_is_held+0xbc/0x140 [ 19.566898] ? pkcs7_parse_message+0x18a/0x730 [ 19.567337] ? rcu_read_lock_sched_held+0x108/0x120 [ 19.567791] ? kmem_cache_alloc_trace+0x459/0x750 [ 19.568231] ? lock_release+0xd70/0xd70 [ 19.568603] pkcs7_parse_message+0x2b3/0x730 [ 19.568999] ? key_task_permission+0x330/0x330 [ 19.569442] ? pkcs7_supply_detached_data+0x90/0x90 [ 19.569887] verify_pkcs7_signature+0x8d/0x290 [ 19.570412] ? restrict_link_by_builtin_and_secondary_trusted+0x80/0x80 [ 19.570984] ? __down_interruptible+0x6b0/0x6b0 [ 19.571416] ? trace_hardirqs_on+0xd/0x10 [ 19.571770] ? current_kernel_time64+0x1d4/0x2f0 [ 19.572196] ? pkcs7_supply_detached_data+0x90/0x90 [ 19.572642] pkcs7_preparse+0x7b/0xc0 [ 19.572966] ? pkcs7_preparse+0xc0/0xc0 [ 19.573332] key_create_or_update+0x533/0x1040 [ 19.573741] ? key_type_lookup+0xd0/0xd0 [ 19.574101] ? join_session_keyring+0x300/0x300 [ 19.574646] ? mem_cgroup_commit_charge+0x111/0x750 [ 19.575112] ? memdup_user+0x5e/0x90 [ 19.575460] SyS_add_key+0x18a/0x340 [ 19.575791] ? key_get_type_from_user.constprop.10+0xd0/0xd0 [ 19.576311] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 19.576776] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 19.577205] RIP: 0033:0x434e89 [ 19.577505] RSP: 002b:00007ffcaa59a408 EFLAGS: 00000217 ORIG_RAX: 00000000000000f8 [ 19.578320] RAX: ffffffffffffffda RBX: 00000000004002b0 RCX: 0000000000434e89 [ 19.579135] RDX: 0000000020000000 RSI: 0000000020000ffb RDI: 0000000020000000 [ 19.579785] RBP: 0000000000000086 R08: fffffffffffffffc R09: 0000000000000000 [ 19.580415] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000000000 [ 19.581062] R13: 0000000000401800 R14: 0000000000401890 R15: 0000000000000000 [ 19.581693] Code: 19 ff 48 8d 43 01 49 89 86 80 fe ff ff 48 89 85 a8 fd ff ff 48 8b 85 c0 fd ff ff 48 01 d8 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 <42> 0f b6 14 3a 38 ca 7f 08 84 d2 0f 85 cd 0f 00 00 0f b6 00 88 [ 19.584456] RIP: asn1_ber_decoder+0x41e/0x1af0 RSP: ffff88003d3f78d0 [ 19.585252] ---[ end trace 8b801baf46dc5868 ]--- [ 19.585822] Kernel panic - not syncing: Fatal exception [ 19.587456] Dumping ftrace buffer: [ 19.587898] (ftrace buffer empty) [ 19.588357] Kernel Offset: disabled [ 19.588804] Rebooting in 86400 seconds..