syzbot


general protection fault in strncpy_from_user

Status: closed as dup on 2017/12/31 08:14
Reported-by: syzbot+4407b50097e2449f5defd27ea4773d6fbd2cb8b2@syzkaller.appspotmail.com
First crash: 1818d, last: 1818d
Duplicate of (1):
Title Repro Cause bisect Fix bisect Count Last Reported
KASAN: use-after-free Read in __list_del_entry_valid (2) C 11 1815d 1817d

Sample crash report:
R13: 0000000000a6f7ff R14: 00007f99fe4069c0 R15: 000000000000000f
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 5026 Comm: syz-executor7 Not tainted 4.15.0-rc3+ #225
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
FAULT_FLAG_ALLOW_RETRY missing 30
CPU: 0 PID: 5038 Comm: syz-executor1 Not tainted 4.15.0-rc3+ #225
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+0x194/0x257 lib/dump_stack.c:53
 handle_userfault+0x12fa/0x24c0 fs/userfaultfd.c:427
 do_anonymous_page mm/memory.c:3121 [inline]
 handle_pte_fault mm/memory.c:3935 [inline]
 __handle_mm_fault+0x32a3/0x3ce0 mm/memory.c:4061
 handle_mm_fault+0x334/0x8d0 mm/memory.c:4098
 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1429
 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1504
 page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1094
RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:45 [inline]
RIP: 0010:strncpy_from_user+0x185/0x430 lib/strncpy_from_user.c:118
RSP: 0018:ffff880191c4fd78 EFLAGS: 00010246
RAX: 0000000000010000 RBX: ffff880191c4fe10 RCX: ffffffff8259ab43
RDX: 0000000000000000 RSI: ffffc900028be000 RDI: ffff880191c4fdd8
RBP: ffff880191c4fe38 R08: ffff8801db21a780 R09: ffff8801c4632640
R10: 0000000000000000 R11: ffffed00388c66c7 R12: 0000000000000fe4
R13: 0000000000000fe4 R14: 0000000020012000 R15: 8080808080808080
 getname_flags+0x10e/0x580 fs/namei.c:149
 getname fs/namei.c:209 [inline]
 SYSC_symlinkat fs/namei.c:4121 [inline]
 SyS_symlinkat fs/namei.c:4112 [inline]
 SYSC_symlink fs/namei.c:4145 [inline]
 SyS_symlink+0x7d/0x240 fs/namei.c:4143
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a39
RSP: 002b:00007f99fe447c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 00000000007580d8 RCX: 0000000000452a39
RDX: 0000000000000000 RSI: 0000000020001000 RDI: 0000000020012000
RBP: 000000000000039b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3728
R13: 00000000ffffffff R14: 00007f99fe4486d4 R15: 000000000000000a
FAULT_FLAG_ALLOW_RETRY missing 30
CPU: 0 PID: 5057 Comm: syz-executor1 Not tainted 4.15.0-rc3+ #225
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+0x194/0x257 lib/dump_stack.c:53
 handle_userfault+0x12fa/0x24c0 fs/userfaultfd.c:427
 do_anonymous_page mm/memory.c:3121 [inline]
 handle_pte_fault mm/memory.c:3935 [inline]
 __handle_mm_fault+0x32a3/0x3ce0 mm/memory.c:4061
 handle_mm_fault+0x334/0x8d0 mm/memory.c:4098
 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1429
 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1504
 page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1094
RIP: 0010:copy_user_generic_unrolled+0x9e/0xc0 arch/x86/lib/copy_user_64.S:74
RSP: 0018:ffff8801c9d9fe78 EFLAGS: 00010202
RAX: 0000000000000004 RBX: 0000000020013000 RCX: 0000000000000004
RDX: 0000000000000004 RSI: 0000000020013000 RDI: ffff8801c9d9fed8
RBP: ffff8801c9d9fea8 R08: ffffed00393b3fdb R09: ffffed00393b3fdb
R10: 0000000000000001 R11: ffffed00393b3fdb R12: 0000000000000004
R13: ffff8801c9d9fed8 R14: 00007ffffffff000 R15: 0000000020013004
 copy_from_user include/linux/uaccess.h:147 [inline]
 do_sched_setscheduler+0x7b/0x1e0 kernel/sched/core.c:4325
 SYSC_sched_setscheduler kernel/sched/core.c:4421 [inline]
 SyS_sched_setscheduler+0xd/0x20 kernel/sched/core.c:4416
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a39
RSP: 002b:00007f99fe3e4c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000090
RAX: ffffffffffffffda RBX: 0000000000758300 RCX: 0000000000452a39
RDX: 0000000020013000 RSI: 0000000000000000 RDI: 0000000000000089
RBP: 0000000000000447 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4748
R13: 00000000ffffffff R14: 00007f99fe3e56d4 R15: 0000000000000010
FAULT_FLAG_ALLOW_RETRY missing 30
CPU: 0 PID: 5055 Comm: syz-executor1 Not tainted 4.15.0-rc3+ #225
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+0x194/0x257 lib/dump_stack.c:53
 handle_userfault+0x12fa/0x24c0 fs/userfaultfd.c:427
 do_anonymous_page mm/memory.c:3121 [inline]
 handle_pte_fault mm/memory.c:3935 [inline]
 __handle_mm_fault+0x32a3/0x3ce0 mm/memory.c:4061
 handle_mm_fault+0x334/0x8d0 mm/memory.c:4098
 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1429
 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1504
 page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1094
RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:61 [inline]
RIP: 0010:strncpy_from_user+0x25c/0x430 lib/strncpy_from_user.c:118
RSP: 0018:ffff8801c685fd78 EFLAGS: 00010246
RAX: 0000000000010000 RBX: 0000000000000000 RCX: ffffffff8259ac1a
RDX: 0000000000000000 RSI: ffffc900029c0000 RDI: ffff8801c685fdd8
RBP: ffff8801c685fe38 R08: ffff8801db21a780 R09: ffff8801c4f26540
R10: 0000000000000000 R11: ffffed00389e4ea7 R12: 0000000000000000
R13: 0000000020012000 R14: 0000000020012000 R15: 8080808080808080
 getname_flags+0x10e/0x580 fs/namei.c:149
 getname fs/namei.c:209 [inline]
 SYSC_symlinkat fs/namei.c:4121 [inline]
 SyS_symlinkat fs/namei.c:4112 [inline]
 SYSC_symlink fs/namei.c:4145 [inline]
 SyS_symlink+0x7d/0x240 fs/namei.c:4143
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a39
RSP: 002b:00007f99fe405c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 00007f99fe406700 RCX: 0000000000452a39
RDX: 0000000000000000 RSI: 0000000020001000 RDI: 0000000020012000
RBP: 0000000000a6f880 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000a6f7ff R14: 00007f99fe4069c0 R15: 000000000000000f
FAULT_FLAG_ALLOW_RETRY missing 30
CPU: 0 PID: 5029 Comm: syz-executor1 Not tainted 4.15.0-rc3+ #225
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+0x194/0x257 lib/dump_stack.c:53
 handle_userfault+0x12fa/0x24c0 fs/userfaultfd.c:427
 do_anonymous_page mm/memory.c:3121 [inline]
 handle_pte_fault mm/memory.c:3935 [inline]
 __handle_mm_fault+0x32a3/0x3ce0 mm/memory.c:4061
 handle_mm_fault+0x334/0x8d0 mm/memory.c:4098
 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1429
 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1504
 page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1094
RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:180
RSP: 0018:ffff88019240f6f8 EFLAGS: 00010202
RAX: ffffed0038956d8d RBX: 0000000020012f18 RCX: 00000000000000e8
RDX: 00000000000000e8 RSI: 0000000020012f18 RDI: ffff8801c4ab6b80
RBP: ffff88019240f728 R08: ffffed0038956d8d R09: ffffed0038956d8d
R10: 000000000000001d R11: ffffed0038956d8c R12: 00000000000000e8
R13: ffff8801c4ab6b80 R14: 00007ffffffff000 R15: 0000000020013000
 copy_from_user include/linux/uaccess.h:147 [inline]
 memdup_user+0x54/0x90 mm/util.c:168
 xfrm_user_policy+0xcf/0x6d0 net/xfrm/xfrm_state.c:2054
 do_ip_setsockopt.isra.12+0xfb0/0x31f0 net/ipv4/ip_sockglue.c:1161
 ip_setsockopt+0x3a/0xb0 net/ipv4/ip_sockglue.c:1248
 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2872
 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968
 SYSC_setsockopt net/socket.c:1829 [inline]
 SyS_setsockopt+0x189/0x360 net/socket.c:1808
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a39
RSP: 002b:00007f99fe468c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452a39
RDX: 0000000000000010 RSI: 0000000000000000 RDI: 0000000000000017
RBP: 00000000000000e1 R08: 00000000000000e8 R09: 0000000000000000
R10: 0000000020012f18 R11: 0000000000000212 R12: 00000000006ef5b8
R13: 00000000ffffffff R14: 00007f99fe4696d4 R15: 0000000000000000
RIP: 0010:native_write_cr4+0x4/0x10 arch/x86/include/asm/special_insns.h:76
RSP: 0018:ffff8801c5bcf5a0 EFLAGS: 00010093
RAX: ffff8801c5714000 RBX: 00000000001606e0 RCX: ffffffff811a2a92
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000001606e0
RBP: ffff8801c5bcf5a0 R08: 1ffff10038b79e0f R09: 0000000000000004
R10: ffff8801c5bcf510 R11: 0000000000000004 R12: 0000000000000093
R13: ffff8801c5714000 R14: ffff8801db514850 R15: ffff8801db514850
FS:  0000000001296940(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f99fe4276d4 CR3: 0000000005e22006 CR4: 00000000001626e0
Call Trace:
 __write_cr4 arch/x86/include/asm/paravirt.h:76 [inline]
 __cr4_set arch/x86/include/asm/tlbflush.h:180 [inline]
 cr4_clear_bits arch/x86/include/asm/tlbflush.h:203 [inline]
 kvm_cpu_vmxoff arch/x86/kvm/vmx.c:3582 [inline]
 hardware_disable+0x34a/0x4b0 arch/x86/kvm/vmx.c:3588
 kvm_arch_hardware_disable+0x35/0xd0 arch/x86/kvm/x86.c:7982
 hardware_disable_nolock+0x30/0x40 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3310
 on_each_cpu+0xca/0x1b0 kernel/smp.c:604
 hardware_disable_all_nolock+0x3e/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3328
 hardware_disable_all arch/x86/kvm/../../../virt/kvm/kvm_main.c:3334 [inline]
 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:742 [inline]
 kvm_put_kvm+0x956/0xdf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:755
 kvm_vm_release+0x42/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:766
 __fput+0x327/0x7e0 fs/file_table.c:210
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9bb/0x1ad0 kernel/exit.c:865
 do_group_exit+0x149/0x400 kernel/exit.c:968
 SYSC_exit_group kernel/exit.c:979 [inline]
 SyS_exit_group+0x1d/0x20 kernel/exit.c:977
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a39
RSP: 002b:0000000000a6fa08 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000758048 RCX: 0000000000452a39
RDX: 0000000000452a39 RSI: 000000000076bd10 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000029 R09: 0000000000000000
R10: 000000000076bd08 R11: 0000000000000202 R12: 0000000000a6f9b0
R13: 0000000000758020 R14: 000000000000021e R15: 000000000000001d
Code: 0f 1f 80 00 00 00 00 55 48 89 e5 0f 20 d8 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 0f 22 df 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 <0f> 22 e7 5d c3 0f 1f 80 00 00 00 00 55 48 89 e5 44 0f 20 c0 5d 
RIP: native_write_cr4+0x4/0x10 arch/x86/include/asm/special_insns.h:76 RSP: ffff8801c5bcf5a0
---[ end trace da73006052b376dc ]---

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce 2017/12/17 10:08 upstream f3b5ad89de16 b6f0c91b .config log report
* Struck through repros no longer work on HEAD.