8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=889ce003, *pmd=ea985003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 30573 Comm: syz-executor.1 Not tainted 6.8.0-rc6-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 : [<8046d124>] lr : [<807d2c68>] psr: 60000013 sp : eb301ca0 ip : eb301cb0 fp : eb301cac r10: 00000018 r9 : 828504e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84ca0000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 92426380 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 84ca0000 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 0xeb300000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Register r12 information: 2-page vmalloc region starting at 0xeb300000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Process syz-executor.1 (pid: 30573, stack limit = 0xeb300000) Stack: (0xeb301ca0 to 0xeb302000) 1ca0: eb301ce4 eb301cb0 807d2c68 8046d124 eb301cd4 eb301f48 8024c7e8 84ca0000 1cc0: 84ca0000 00000000 00000000 00000000 00040000 00000018 eb301d34 eb301ce8 1ce0: 813d9570 807d2b7c 40000013 84498cc0 8579b800 8579b8d0 83438f00 8579b8d8 1d00: eb301f48 00000000 eb301d34 83438f00 00040000 8579b800 83e29800 00000001 1d20: 00000000 00000000 eb301da4 eb301d38 815f7e80 813d948c 00000000 00000000 1d40: 00000000 8579b8d0 8579b8c0 7fffffff 83438fa8 8579b8ec 83439134 eb301f38 1d60: 00000000 83e29800 802a154c 00000100 00000122 bc201ca4 eb301f38 815f7d30 1d80: eb301f38 84498c80 00000000 00000000 00000000 eb301df4 eb301dc4 eb301da8 1da0: 815f71a4 815f7d3c 00000000 00000000 00000000 815f716c eb301de4 eb301dc8 1dc0: 8134c5e0 815f7178 eb301f38 84498c80 20003780 00000000 eb301ea4 eb301de8 1de0: 8134c7e4 8134c59c 00000000 00000000 00000001 00000000 00000000 00000000 1e00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e60: 00000000 00000000 00000000 00000000 00000000 bc201ca4 00000000 00000000 1e80: eb301f38 20003780 00000000 84498c80 83e29800 00000129 eb301f24 eb301ea8 1ea0: 8134f6fc 8134c760 00000000 00000000 00000008 00000000 00000000 20001f00 1ec0: 00040000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1ee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 bc201ca4 1f00: eb301f24 84498c80 00000000 20003780 00000000 80200288 eb301fa4 eb301f28 1f20: 8134feb4 8134f680 00000000 eb301f38 00000001 fffffff7 eb301df4 00000000 1f40: 00000000 00000000 00000000 00000000 20001f00 00040000 00000001 00000000 1f60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 1f80: 8020ca34 bc201ca4 00000000 00000000 0014c2c8 00000129 00000000 eb301fa8 1fa0: 80200060 8134fe4c 00000000 00000000 00000003 20003780 00000000 00000000 1fc0: 00000000 00000000 0014c2c8 00000129 7ebce32e 7ebce32f 003d0f00 76b6b0fc 1fe0: 76b6af08 76b6aef8 000167e8 00050bb0 60000010 00000003 00000000 00000000 Backtrace: [<8046d118>] (__kmap_local_page_prot) from [<807d2c68>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046d118>] (__kmap_local_page_prot) from [<807d2c68>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807d2b70>] (copy_page_to_iter) from [<813d9570>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00040000 r8:00000000 r7:00000000 r6:00000000 r5:84ca0000 r4:84ca0000 [<813d9480>] (sk_msg_recvmsg) from [<815f7e80>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d9480>] (sk_msg_recvmsg) from [<815f7e80>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:83e29800 r6:8579b800 r5:00040000 r4:83438f00 [<815f7d30>] (unix_bpf_recvmsg) from [<815f71a4>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2468) r10:eb301df4 r9:00000000 r8:00000000 r7:00000000 r6:84498c80 r5:eb301f38 r4:815f7d30 [<815f716c>] (unix_dgram_recvmsg) from [<8134c5e0>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f716c>] (unix_dgram_recvmsg) from [<8134c5e0>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f716c [<8134c590>] (sock_recvmsg) from [<8134c7e4>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:20003780 r5:84498c80 r4:eb301f38 [<8134c754>] (____sys_recvmsg) from [<8134f6fc>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000129 r9:83e29800 r8:84498c80 r7:00000000 r6:20003780 r5:eb301f38 r4:00000000 [<8134f674>] (___sys_recvmsg) from [<8134feb4>] (__sys_recvmsg net/socket.c:2875 [inline]) [<8134f674>] (___sys_recvmsg) from [<8134feb4>] (__do_sys_recvmsg net/socket.c:2885 [inline]) [<8134f674>] (___sys_recvmsg) from [<8134feb4>] (sys_recvmsg+0x74/0xb8 net/socket.c:2882) r8:80200288 r7:00000000 r6:20003780 r5:00000000 r4:84498c80 [<8134fe40>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xeb301fa8 to 0xeb301ff0) 1fa0: 00000000 00000000 00000003 20003780 00000000 00000000 1fc0: 00000000 00000000 0014c2c8 00000129 7ebce32e 7ebce32f 003d0f00 76b6b0fc 1fe0: 76b6af08 76b6aef8 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