8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read
[00000000] *pgd=850dc003, *pmd=fe73d003
Internal error: Oops: 205 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 1 PID: 6589 Comm: syz-executor.0 Not tainted 6.10.0-rc2-syzkaller #0
Hardware name: ARM-Versatile Express
PC is at page_zonenum include/linux/mmzone.h:1103 [inline]
PC is at __kmap_local_page_prot+0xc/0x74 mm/highmem.c:573
LR is at kmap_local_page include/linux/highmem-internal.h:73 [inline]
LR is at copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360
pc : [<80481540>] lr : [<80806998>] psr: 60000013
sp : dfe5dca0 ip : dfe5dcb0 fp : dfe5dcac
r10: 00000018 r9 : 8285f4e8 r8 : 00000000
r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8432f800
r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000
Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
Control: 30c5387d Table: 84f7c940 DAC: 00000000
Register r0 information: NULL pointer
Register r1 information: NULL pointer
Register r2 information: non-paged memory
Register r3 information: non-paged memory
Register r4 information: slab kmalloc-1k start 8432f800 pointer offset 0 size 1024
Register r5 information: NULL pointer
Register r6 information: NULL pointer
Register r7 information: NULL pointer
Register r8 information: NULL pointer
Register r9 information: non-slab/vmalloc memory
Register r10 information: non-paged memory
Register r11 information: 2-page vmalloc region starting at 0xdfe5c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797
Register r12 information: 2-page vmalloc region starting at 0xdfe5c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797
Process syz-executor.0 (pid: 6589, stack limit = 0xdfe5c000)
Stack: (0xdfe5dca0 to 0xdfe5e000)
dca0: dfe5dce4 dfe5dcb0 80806998 80481540 dfe5dcd4 dfe5df48 8024d2c4 8432f800
dcc0: 8432f800 00000000 00000000 00000000 000000b3 00000018 dfe5dd34 dfe5dce8
dce0: 8146162c 808068ac 40000013 84a07440 8405a200 8405a2e0 8464c600 8405a2e8
dd00: dfe5df48 00000000 dfe5dd34 8464c600 000000b3 8405a200 84170000 00000001
dd20: 00000000 00000000 dfe5dda4 dfe5dd38 81688d74 81461548 00000000 00000000
dd40: 00000000 8405a2e0 8405a2d0 7fffffff 8464c688 8405a2fc 8464c834 dfe5df38
dd60: 00000000 84170000 802a4894 00000100 00000122 ee814d94 dfe5df38 81688c24
dd80: dfe5df38 84a07400 00000000 00000000 00000000 dfe5ddf4 dfe5ddc4 dfe5dda8
dda0: 81687abc 81688c30 00000000 00000000 00000000 81687a84 dfe5dde4 dfe5ddc8
ddc0: 813d0894 81687a90 dfe5df38 200004c0 84a07400 00000000 dfe5dea4 dfe5dde8
dde0: 813d0a98 813d0850 00000001 00000000 dfe5de34 00000000 00000000 00000000
de00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
de20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
de40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
de60: 00000000 00000000 00000000 00000000 00000000 ee814d94 00000000 00000000
de80: dfe5df38 200004c0 00000000 84a07400 84170000 00000129 dfe5df24 dfe5dea8
dea0: 813d3b7c 813d0a14 00000000 00000000 80287344 00000000 00000000 200006c0
dec0: 000000b3 00000000 00000000 00000000 00000000 00000000 00000000 00000000
dee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 ee814d94
df00: dfe5df24 84a07400 00000000 200004c0 00000000 8020029c dfe5dfa4 dfe5df28
df20: 813d435c 813d3b00 00000000 dfe5df38 00000001 fffffff7 dfe5ddf4 00000000
df40: 00000000 00000000 00000000 00000000 200006c0 000000b3 00000001 00000000
df60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000
df80: 8020c910 ee814d94 00000000 00000000 001542c8 00000129 00000000 dfe5dfa8
dfa0: 80200060 813d42f4 00000000 00000000 00000003 200004c0 00000000 00000000
dfc0: 00000000 00000000 001542c8 00000129 7ea08336 7ea08337 003d0f00 76beb0fc
dfe0: 76beaf08 76beaef8 00016ed0 000515c0 60000010 00000003 00000000 00000000
Call trace:
[<80481534>] (__kmap_local_page_prot) from [<80806998>] (kmap_local_page include/linux/highmem-internal.h:73 [inline])
[<80481534>] (__kmap_local_page_prot) from [<80806998>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360)
[<808068a0>] (copy_page_to_iter) from [<8146162c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437)
r10:00000018 r9:000000b3 r8:00000000 r7:00000000 r6:00000000 r5:8432f800
r4:8432f800
[<8146153c>] (sk_msg_recvmsg) from [<81688d74>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline])
[<8146153c>] (sk_msg_recvmsg) from [<81688d74>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50)
r10:00000000 r9:00000000 r8:00000001 r7:84170000 r6:8405a200 r5:000000b3
r4:8464c600
[<81688c24>] (unix_bpf_recvmsg) from [<81687abc>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2489)
r10:dfe5ddf4 r9:00000000 r8:00000000 r7:00000000 r6:84a07400 r5:dfe5df38
r4:81688c24
[<81687a84>] (unix_dgram_recvmsg) from [<813d0894>] (sock_recvmsg_nosec net/socket.c:1046 [inline])
[<81687a84>] (unix_dgram_recvmsg) from [<813d0894>] (sock_recvmsg+0x50/0x78 net/socket.c:1068)
r4:81687a84
[<813d0844>] (sock_recvmsg) from [<813d0a98>] (____sys_recvmsg+0x90/0x184 net/socket.c:2804)
r7:00000000 r6:84a07400 r5:200004c0 r4:dfe5df38
[<813d0a08>] (____sys_recvmsg) from [<813d3b7c>] (___sys_recvmsg+0x88/0xbc net/socket.c:2846)
r10:00000129 r9:84170000 r8:84a07400 r7:00000000 r6:200004c0 r5:dfe5df38
r4:00000000
[<813d3af4>] (___sys_recvmsg) from [<813d435c>] (__sys_recvmsg net/socket.c:2876 [inline])
[<813d3af4>] (___sys_recvmsg) from [<813d435c>] (__do_sys_recvmsg net/socket.c:2886 [inline])
[<813d3af4>] (___sys_recvmsg) from [<813d435c>] (sys_recvmsg+0x74/0xb8 net/socket.c:2883)
r8:8020029c r7:00000000 r6:200004c0 r5:00000000 r4:84a07400
[<813d42e8>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfe5dfa8 to 0xdfe5dff0)
dfa0: 00000000 00000000 00000003 200004c0 00000000 00000000
dfc0: 00000000 00000000 001542c8 00000129 7ea08336 7ea08337 003d0f00 76beb0fc
dfe0: 76beaf08 76beaef8 00016ed0 000515c0
r7:00000129 r6:001542c8 r5:00000000 r4:00000000
Code: eaffffe8 e1a0c00d e92dd800 e24cb004 (e5901000)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: eaffffe8 b 0xffffffa8
4: e1a0c00d mov ip, sp
8: e92dd800 push {fp, ip, lr, pc}
c: e24cb004 sub fp, ip, #4
* 10: e5901000 ldr r1, [r0] <-- trapping instruction