8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=98333003, *pmd=dfc9b003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 12737 Comm: syz-executor.0 Not tainted 6.7.0-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1109 [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 : [<8046aac8>] lr : [<807e2350>] psr: 60000013 sp : e0451c00 ip : e0451c10 fp : e0451c0c r10: 00000018 r9 : 828574e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8d29d400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84fd3180 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 8d29d400 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 0xe0450000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Register r12 information: 2-page vmalloc region starting at 0xe0450000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Process syz-executor.0 (pid: 12737, stack limit = 0xe0450000) Stack: (0xe0451c00 to 0xe0452000) 1c00: e0451c44 e0451c10 807e2350 8046aac8 e0451c34 e0451ef0 8024c5d8 8d29d400 1c20: 8d29d400 00000000 00000000 00000000 00022fe0 00000018 e0451c94 e0451c48 1c40: 813dbff8 807e2264 40000013 8482ecc0 84732c00 84732cd0 82f8f600 84732cd8 1c60: e0451ef0 00000000 e0451c94 82f8f600 00022fe0 84732c00 84133000 00000001 1c80: 00000000 00000000 e0451d04 e0451c98 815f8fbc 813dbf14 00000000 00000002 1ca0: e0451cac 84732cd0 84732cc0 7fffffff 82f8f6a8 84732cec 82f8f83c e0451ee0 1cc0: 00000000 84133000 802a0bd4 00000100 00000122 0350b6a2 00000000 815f8e6c 1ce0: e0451ee0 8482ec80 00000000 00000000 00000000 e0451d54 e0451d24 e0451d08 1d00: 815f82fc 815f8e78 00000000 00000000 00000000 815f82c4 e0451d44 e0451d28 1d20: 813511fc 815f82d0 e0451ee0 8482ec80 20006000 00000000 e0451e04 e0451d48 1d40: 81351400 813511b8 00000000 00000000 00000001 00000000 00000000 00000000 1d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1da0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1dc0: 00000000 00000000 00000000 00000000 00000000 0350b6a2 00000000 00000000 1de0: e0451ee0 20006000 00000000 8482ec80 84133000 00000002 e0451e84 e0451e08 1e00: 81354318 8135137c 00000000 00000000 81a02a80 00000000 00000000 20000040 1e20: 00022fe0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 0350b6a2 1e60: e0451e84 e0451ec0 20006000 00000000 00000000 00000000 e0451f5c e0451e88 1e80: 81354440 8135429c 00000000 e0451e98 80893814 8482ec80 00000001 00000000 1ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1ec0: 000f4240 e0451ed8 00050b40 00000000 00000000 00000000 e0451f04 e0451ee8 1ee0: e0451d54 00000000 00000000 00000000 00000000 00000000 20000040 00022fe0 1f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 1f20: 00000000 00000000 e0451f44 0350b6a2 81854328 00000003 20006000 00000000 1f40: 00000000 00000002 84133000 0000016d e0451fa4 e0451f60 81354e10 81354358 1f60: 00000000 e0451fb0 00000000 00000000 00000000 00000000 e0451fac 0350b6a2 1f80: 8020c9bc 00000000 00000000 0014c2d0 0000016d 80200288 00000000 e0451fa8 1fa0: 80200060 81354d58 00000000 00000000 00000003 20006000 00000002 00000000 1fc0: 00000000 00000000 0014c2d0 0000016d 7efaa32e 7efaa32f 003d0f00 76b0a0fc 1fe0: 76b09f08 76b09ef8 000167d0 00050b40 60000010 00000003 00000000 00000000 Backtrace: [<8046aabc>] (__kmap_local_page_prot) from [<807e2350>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046aabc>] (__kmap_local_page_prot) from [<807e2350>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807e2258>] (copy_page_to_iter) from [<813dbff8>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00022fe0 r8:00000000 r7:00000000 r6:00000000 r5:8d29d400 r4:8d29d400 [<813dbf08>] (sk_msg_recvmsg) from [<815f8fbc>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813dbf08>] (sk_msg_recvmsg) from [<815f8fbc>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:84133000 r6:84732c00 r5:00022fe0 r4:82f8f600 [<815f8e6c>] (unix_bpf_recvmsg) from [<815f82fc>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2483) r10:e0451d54 r9:00000000 r8:00000000 r7:00000000 r6:8482ec80 r5:e0451ee0 r4:815f8e6c [<815f82c4>] (unix_dgram_recvmsg) from [<813511fc>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f82c4>] (unix_dgram_recvmsg) from [<813511fc>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f82c4 [<813511ac>] (sock_recvmsg) from [<81351400>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:20006000 r5:8482ec80 r4:e0451ee0 [<81351370>] (____sys_recvmsg) from [<81354318>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000002 r9:84133000 r8:8482ec80 r7:00000000 r6:20006000 r5:e0451ee0 r4:00000000 [<81354290>] (___sys_recvmsg) from [<81354440>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000000 r5:20006000 r4:e0451ec0 [<8135434c>] (do_recvmmsg) from [<81354e10>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<8135434c>] (do_recvmmsg) from [<81354e10>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<8135434c>] (do_recvmmsg) from [<81354e10>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:84133000 r8:00000002 r7:00000000 r6:00000000 r5:20006000 r4:00000003 [<81354d4c>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xe0451fa8 to 0xe0451ff0) 1fa0: 00000000 00000000 00000003 20006000 00000002 00000000 1fc0: 00000000 00000000 0014c2d0 0000016d 7efaa32e 7efaa32f 003d0f00 76b0a0fc 1fe0: 76b09f08 76b09ef8 000167d0 00050b40 r8:80200288 r7:0000016d r6:0014c2d0 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