8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8467d003, *pmd=fe59c003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 6966 Comm: syz-executor.0 Not tainted 6.9.0-rc1-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1100 [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 : [<80479e00>] lr : [<807eb304>] psr: 60000013 sp : dfb0dca0 ip : dfb0dcb0 fp : dfb0dcac r10: 00000018 r9 : 828584e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84f8cc00 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8509ed40 DAC: fffffffd 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 84f8cc00 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 0xdfb0c000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Register r12 information: 2-page vmalloc region starting at 0xdfb0c000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796 Process syz-executor.0 (pid: 6966, stack limit = 0xdfb0c000) Stack: (0xdfb0dca0 to 0xdfb0e000) dca0: dfb0dce4 dfb0dcb0 807eb304 80479e00 dfb0dcd4 dfb0df48 8024c880 84f8cc00 dcc0: 84f8cc00 00000000 00000001 00000000 000000cf 00000018 dfb0dd34 dfb0dce8 dce0: 8140bd2c 807eb218 00000000 9fa9e1e2 83f83800 83f838d0 84f74300 83f838d8 dd00: dfb0df48 00000002 dfb0dd8c 84f74300 000000cf 83f83800 83e0b000 00000000 dd20: 00000102 00000000 dfb0dda4 dfb0dd38 8162e758 8140bc48 00000102 00000000 dd40: 00000000 00000000 00000000 00000000 84f74388 83f838ec 84f74534 dfb0df38 dd60: 00000000 9fa9e1e2 8189bb08 8219b848 00000102 9fa9e1e2 dfb0df38 8162e608 dd80: dfb0df38 8482d900 00000102 00000000 00000102 dfb0ddf4 dfb0ddc4 dfb0dda8 dda0: 8162d7f4 8162e614 00000000 00000102 00000000 8162d7bc dfb0dde4 dfb0ddc8 ddc0: 8137b318 8162d7c8 dfb0df38 8482d900 200004c0 00000000 dfb0dea4 dfb0dde8 dde0: 8137b518 8137b2d4 00000000 00000000 00000001 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 9fa9e1e2 00000000 00000000 de80: dfb0df38 200004c0 00000102 8482d900 83e0b000 00000129 dfb0df24 dfb0dea8 dea0: 8137e45c 8137b494 00000102 00000000 00000008 00000000 00000000 20000100 dec0: 000000cf 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9fa9e1e2 df00: dfb0df24 8482d900 00000000 200004c0 00000102 80200288 dfb0dfa4 dfb0df28 df20: 8137ebd8 8137e3e0 00000000 dfb0df38 00000001 fffffff7 dfb0ddf4 00000000 df40: 00000000 00000000 00000000 00000001 20000100 000000ce 00000001 00000000 df60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 df80: 8020ca6c 9fa9e1e2 00000000 00000000 0014c2c8 00000129 00000000 dfb0dfa8 dfa0: 80200060 8137eb70 00000000 00000000 00000003 200004c0 00000102 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7eba832e 7eba832f 003d0f00 76b4f0fc dfe0: 76b4ef08 76b4eef8 000167f8 00050bc0 60000010 00000003 00000000 00000000 Call trace: [<80479df4>] (__kmap_local_page_prot) from [<807eb304>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<80479df4>] (__kmap_local_page_prot) from [<807eb304>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360) [<807eb20c>] (copy_page_to_iter) from [<8140bd2c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000cf r8:00000000 r7:00000001 r6:00000000 r5:84f8cc00 r4:84f8cc00 [<8140bc3c>] (sk_msg_recvmsg) from [<8162e758>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<8140bc3c>] (sk_msg_recvmsg) from [<8162e758>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000102 r8:00000000 r7:83e0b000 r6:83f83800 r5:000000cf r4:84f74300 [<8162e608>] (unix_bpf_recvmsg) from [<8162d7f4>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2529) r10:dfb0ddf4 r9:00000102 r8:00000000 r7:00000102 r6:8482d900 r5:dfb0df38 r4:8162e608 [<8162d7bc>] (unix_dgram_recvmsg) from [<8137b318>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<8162d7bc>] (unix_dgram_recvmsg) from [<8137b318>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:8162d7bc [<8137b2c8>] (sock_recvmsg) from [<8137b518>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:200004c0 r5:8482d900 r4:dfb0df38 [<8137b488>] (____sys_recvmsg) from [<8137e45c>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:83e0b000 r8:8482d900 r7:00000102 r6:200004c0 r5:dfb0df38 r4:00000000 [<8137e3d4>] (___sys_recvmsg) from [<8137ebd8>] (__sys_recvmsg net/socket.c:2875 [inline]) [<8137e3d4>] (___sys_recvmsg) from [<8137ebd8>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<8137e3d4>] (___sys_recvmsg) from [<8137ebd8>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000102 r6:200004c0 r5:00000000 r4:8482d900 [<8137eb64>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdfb0dfa8 to 0xdfb0dff0) dfa0: 00000000 00000000 00000003 200004c0 00000102 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7eba832e 7eba832f 003d0f00 76b4f0fc dfe0: 76b4ef08 76b4eef8 000167f8 00050bc0 r7:00000129 r6:0014c2c8 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