8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=975f1003, *pmd=fe608003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 448 Comm: syz-executor.1 Not tainted 6.8.0-rc3-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1097 [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:379 pc : [<8046d074>] lr : [<807d2848>] psr: 60000013 sp : e090dca0 ip : e090dcb0 fp : e090dcac r10: 00000018 r9 : 8284f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84e32400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84d90180 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 84e32400 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 0xe090c000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Register r12 information: 2-page vmalloc region starting at 0xe090c000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Process syz-executor.1 (pid: 448, stack limit = 0xe090c000) Stack: (0xe090dca0 to 0xe090e000) dca0: e090dce4 e090dcb0 807d2848 8046d074 e090dcd4 e090df48 8024c824 84e32400 dcc0: 84e32400 00000000 00000000 00000000 00001000 00000018 e090dd34 e090dce8 dce0: 813d805c 807d275c 40000013 8323a040 84452800 844528d0 97499500 844528d8 dd00: e090df48 00000000 e090dd34 97499500 00001000 84452800 82e79800 00000001 dd20: 00000000 00000000 e090dda4 e090dd38 815f63b0 813d7f78 00000000 00000000 dd40: 00000000 844528d0 844528c0 7fffffff 974995a8 844528ec 97499734 e090df38 dd60: 00000000 82e79800 802a158c 00000100 00000122 165a47c4 e090df38 815f6260 dd80: e090df38 8323a000 00000000 00000000 00000000 e090ddf4 e090ddc4 e090dda8 dda0: 815f56f0 815f626c 00000000 00000000 00000000 815f56b8 e090dde4 e090ddc8 ddc0: 8134b118 815f56c4 e090df38 8323a000 20000180 00000000 e090dea4 e090dde8 dde0: 8134b31c 8134b0d4 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 165a47c4 00000000 00000000 de80: e090df38 20000180 00000000 8323a000 82e79800 00000129 e090df24 e090dea8 dea0: 8134e234 8134b298 00000000 00000000 00000008 00000000 00000000 200008c0 dec0: 00001000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 165a47c4 df00: e090df24 8323a000 00000000 20000180 00000000 80200288 e090dfa4 e090df28 df20: 8134e9ec 8134e1b8 00000000 e090df38 00000001 fffffff7 e090ddf4 00000000 df40: 00000000 00000000 00000000 00000000 200008c0 00001000 00000001 00000000 df60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 df80: 8020ca34 165a47c4 00000000 00000000 0014c2c8 00000129 00000000 e090dfa8 dfa0: 80200060 8134e984 00000000 00000000 00000003 20000180 00000000 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7e80432e 7e80432f 003d0f00 76b1c0fc dfe0: 76b1bf08 76b1bef8 000167e8 00050bb0 60000010 00000003 00000000 00000000 Backtrace: [<8046d068>] (__kmap_local_page_prot) from [<807d2848>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046d068>] (__kmap_local_page_prot) from [<807d2848>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807d2750>] (copy_page_to_iter) from [<813d805c>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00001000 r8:00000000 r7:00000000 r6:00000000 r5:84e32400 r4:84e32400 [<813d7f6c>] (sk_msg_recvmsg) from [<815f63b0>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d7f6c>] (sk_msg_recvmsg) from [<815f63b0>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:82e79800 r6:84452800 r5:00001000 r4:97499500 [<815f6260>] (unix_bpf_recvmsg) from [<815f56f0>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2481) r10:e090ddf4 r9:00000000 r8:00000000 r7:00000000 r6:8323a000 r5:e090df38 r4:815f6260 [<815f56b8>] (unix_dgram_recvmsg) from [<8134b118>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f56b8>] (unix_dgram_recvmsg) from [<8134b118>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f56b8 [<8134b0c8>] (sock_recvmsg) from [<8134b31c>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:20000180 r5:8323a000 r4:e090df38 [<8134b28c>] (____sys_recvmsg) from [<8134e234>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:82e79800 r8:8323a000 r7:00000000 r6:20000180 r5:e090df38 r4:00000000 [<8134e1ac>] (___sys_recvmsg) from [<8134e9ec>] (__sys_recvmsg net/socket.c:2875 [inline]) [<8134e1ac>] (___sys_recvmsg) from [<8134e9ec>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<8134e1ac>] (___sys_recvmsg) from [<8134e9ec>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000000 r6:20000180 r5:00000000 r4:8323a000 [<8134e978>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xe090dfa8 to 0xe090dff0) dfa0: 00000000 00000000 00000003 20000180 00000000 00000000 dfc0: 00000000 00000000 0014c2c8 00000129 7e80432e 7e80432f 003d0f00 76b1c0fc dfe0: 76b1bf08 76b1bef8 000167e8 00050bb0 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