syzbot


BUG: unable to handle kernel paging request in cap_capable

Status: fixed on 2021/11/10 00:50
Reported-by: syzbot+79f4a8692e267bdb7227@syzkaller.appspotmail.com
Fix commit: 9384eacd80f3 net: core: don't call SIOCBRADD/DELIF for non-bridge devices
First crash: 374d, last: 374d

Cause bisection: introduced by (bisect log) [no-op commit]:
commit b9fc8b4a591811546fec2dbef7e9f809362100c9
Author: Grant Seltzer <grantseltzer@gmail.com>
Date: Mon Feb 22 19:58:46 2021 +0000

  bpf: Add kernel/modules BTF presence checks to bpftool feature command

Crash: WARNING in kvm_wait (log)
Repro: C syz .config

Sample crash report:
netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
BUG: unable to handle page fault for address: fffff3008f71a93b
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8445 Comm: syz-executor610 Not tainted 5.14.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:cap_capable+0xa0/0x280 security/commoncap.c:83
Code: 0f 8e d3 01 00 00 41 8b ad e0 00 00 00 49 bc 00 00 00 00 00 fc ff df e8 ce ef da fd 48 8d bb e0 00 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 74 08 3c 03 0f 8e 64 01 00 00 44 8b bb e0 00
RSP: 0018:ffffc90001c3f9d8 EFLAGS: 00010a02
RAX: 1ffff7008f71a93b RBX: ffffb8047b8d48f8 RCX: 0000000000000000
RDX: ffff88802dad54c0 RSI: ffffffff839aad82 RDI: ffffb8047b8d49d8
RBP: 0000000000000000 R08: 0000000000000028 R09: ffffffff87f70fe6
R10: ffffffff814731be R11: 00000000000089a2 R12: dffffc0000000000
R13: ffffffff8b83b660 R14: ffff8880155fa500 R15: ffff8880155fa500
FS:  000000000105d300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff3008f71a93b CR3: 000000002789f000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 security_capable+0x5c/0xc0 security/security.c:805
 ns_capable_common kernel/capability.c:375 [inline]
 ns_capable+0x6f/0x100 kernel/capability.c:396
 add_del_if+0x9b/0x140 net/bridge/br_ioctl.c:89
 br_ioctl_stub+0x1c6/0x7f0 net/bridge/br_ioctl.c:397
 br_ioctl_call+0x5e/0xa0 net/socket.c:1092
 dev_ifsioc+0xc1f/0xf60 net/core/dev_ioctl.c:382
 dev_ioctl+0x1b9/0xee0 net/core/dev_ioctl.c:580
 sock_do_ioctl+0x18b/0x210 net/socket.c:1129
 sock_ioctl+0x2f1/0x640 net/socket.c:1232
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl fs/ioctl.c:1055 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:1055
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4430a9
Code: 28 c3 e8 4a 15 00 00 66 2e 0f 1f 84 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe266e8a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffe266e8a58 RCX: 00000000004430a9
RDX: 0000000020000080 RSI: 00000000000089a2 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe266e8a60
R13: 00007ffe266e8a80 R14: 00000000004b8018 R15: 00000000004004b8
Modules linked in:
CR2: fffff3008f71a93b
---[ end trace 5ec5ff62110878d2 ]---
RIP: 0010:cap_capable+0xa0/0x280 security/commoncap.c:83
Code: 0f 8e d3 01 00 00 41 8b ad e0 00 00 00 49 bc 00 00 00 00 00 fc ff df e8 ce ef da fd 48 8d bb e0 00 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 74 08 3c 03 0f 8e 64 01 00 00 44 8b bb e0 00
RSP: 0018:ffffc90001c3f9d8 EFLAGS: 00010a02
RAX: 1ffff7008f71a93b RBX: ffffb8047b8d48f8 RCX: 0000000000000000
RDX: ffff88802dad54c0 RSI: ffffffff839aad82 RDI: ffffb8047b8d49d8
RBP: 0000000000000000 R08: 0000000000000028 R09: ffffffff87f70fe6
R10: ffffffff814731be R11: 00000000000089a2 R12: dffffc0000000000
R13: ffffffff8b83b660 R14: ffff8880155fa500 R15: ffff8880155fa500
FS:  000000000105d300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff3008f71a93b CR3: 000000002789f000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (4):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-net-kasan-gce 2021/08/04 10:56 net-next b820c114eba7 6c236867 .config log report syz C BUG: unable to handle kernel paging request in cap_capable
ci-upstream-linux-next-kasan-gce-root 2021/08/04 10:23 linux-next 8d4b477da1a8 6c236867 .config log report syz C BUG: unable to handle kernel paging request in cap_capable
ci-upstream-linux-next-kasan-gce-root 2021/08/05 03:34 linux-next 8d4b477da1a8 b97d64c9 .config log report info BUG: unable to handle kernel paging request in cap_capable
ci-upstream-linux-next-kasan-gce-root 2021/08/04 10:03 linux-next 8d4b477da1a8 6c236867 .config log report info BUG: unable to handle kernel paging request in cap_capable