8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=86688003, *pmd=fe148003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 15213 Comm: syz-executor.0 Not tainted 6.6.0-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1105 [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 : [<8046ad00>] lr : [<807e0824>] psr: 60000013 sp : df9c9c20 ip : df9c9c30 fp : df9c9c2c r10: 00000018 r9 : 828574e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8a08c800 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86692e00 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 8a08c800 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 0xdf9c8000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Register r12 information: 2-page vmalloc region starting at 0xdf9c8000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Process syz-executor.0 (pid: 15213, stack limit = 0xdf9c8000) Stack: (0xdf9c9c20 to 0xdf9ca000) 9c20: df9c9c64 df9c9c30 807e0824 8046ad00 df9c9c54 df9c9ef0 8024c610 8a08c800 9c40: 8a08c800 00000000 00000000 00000000 00000041 00000018 df9c9cb4 df9c9c68 9c60: 813d8b90 807e0738 00000002 f3b0051b 84754200 847542d0 8b747600 847542d8 9c80: df9c9ef0 00000000 845e0000 8b747600 00000041 84754200 845e0000 00000000 9ca0: 00000000 00000000 df9c9d24 df9c9cb8 815f5074 813d8aac 00000000 df9c9ee0 9cc0: 00000000 00000000 815f437c df9c9ee0 8b7476a8 847542ec 8b74783c df9c9ee0 9ce0: df9c9ee0 833b7900 00000000 00000000 00000000 f3b0051b df9c9d24 815f4f24 9d00: 833b7900 20000d60 815f437c 00000000 00000000 df9c9d54 df9c9d44 df9c9d28 9d20: 815f43b4 815f4f30 00000000 833b7900 20000d40 df9c9ee0 df9c9e04 df9c9d48 9d40: 8134e4c4 815f4388 00000000 00000000 00000001 00000000 00000000 00000000 9d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9da0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9dc0: 00000000 00000000 00000000 00000000 00000000 f3b0051b 00000000 00000000 9de0: df9c9ee0 20000d60 00000000 833b7900 845e0000 00000002 df9c9e84 df9c9e08 9e00: 81351354 8134e39c 00000000 00000001 80314400 00000000 00000000 20000500 9e20: 00000041 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 f3b0051b 9e60: df9c9e84 df9c9ec0 20000d60 00000001 00000000 00000000 df9c9f5c df9c9e88 9e80: 8135147c 813512d8 00000001 df9c9e98 80891c34 833b7900 00000001 00000000 9ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9ec0: 00000000 00000000 000509d0 00000000 00000000 00000000 df9c9f04 df9c9ee8 9ee0: df9c9d54 00000000 00000000 00000000 00000000 00000000 20000500 00000041 9f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 9f20: 00000000 00000000 df9c9f44 f3b0051b 8185067c 00000003 20000d40 00000000 9f40: 00000000 00000002 845e0000 0000016d df9c9fa4 df9c9f60 81351e4c 81351394 9f60: 00000000 df9c9fb0 00000000 00000000 00000000 00000000 df9c9fac f3b0051b 9f80: 8020c9bc 00000000 00000000 0014c2c8 0000016d 80200288 00000000 df9c9fa8 9fa0: 80200060 81351d94 00000000 00000000 00000003 20000d40 00000002 00000000 9fc0: 00000000 00000000 0014c2c8 0000016d 7e80c32e 7e80c32f 003d0f00 76bbb0fc 9fe0: 76bbaf08 76bbaef8 00016680 000509d0 60000010 00000003 00000000 00000000 Backtrace: [<8046acf4>] (__kmap_local_page_prot) from [<807e0824>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046acf4>] (__kmap_local_page_prot) from [<807e0824>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807e072c>] (copy_page_to_iter) from [<813d8b90>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000041 r8:00000000 r7:00000000 r6:00000000 r5:8a08c800 r4:8a08c800 [<813d8aa0>] (sk_msg_recvmsg) from [<815f5074>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d8aa0>] (sk_msg_recvmsg) from [<815f5074>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:845e0000 r6:84754200 r5:00000041 r4:8b747600 [<815f4f24>] (unix_bpf_recvmsg) from [<815f43b4>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2485) r10:df9c9d54 r9:00000000 r8:00000000 r7:815f437c r6:20000d60 r5:833b7900 r4:815f4f24 [<815f437c>] (unix_dgram_recvmsg) from [<8134e4c4>] (sock_recvmsg_nosec net/socket.c:1044 [inline]) [<815f437c>] (unix_dgram_recvmsg) from [<8134e4c4>] (____sys_recvmsg+0x134/0x158 net/socket.c:2805) r4:df9c9ee0 [<8134e390>] (____sys_recvmsg) from [<81351354>] (___sys_recvmsg+0x88/0xbc net/socket.c:2849) r10:00000002 r9:845e0000 r8:833b7900 r7:00000000 r6:20000d60 r5:df9c9ee0 r4:00000000 [<813512cc>] (___sys_recvmsg) from [<8135147c>] (do_recvmmsg+0xf4/0x298 net/socket.c:2943) r8:00000000 r7:00000000 r6:00000001 r5:20000d60 r4:df9c9ec0 [<81351388>] (do_recvmmsg) from [<81351e4c>] (__sys_recvmmsg net/socket.c:3022 [inline]) [<81351388>] (do_recvmmsg) from [<81351e4c>] (__do_sys_recvmmsg_time32 net/socket.c:3056 [inline]) [<81351388>] (do_recvmmsg) from [<81351e4c>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3049) r10:0000016d r9:845e0000 r8:00000002 r7:00000000 r6:00000000 r5:20000d40 r4:00000003 [<81351d88>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xdf9c9fa8 to 0xdf9c9ff0) 9fa0: 00000000 00000000 00000003 20000d40 00000002 00000000 9fc0: 00000000 00000000 0014c2c8 0000016d 7e80c32e 7e80c32f 003d0f00 76bbb0fc 9fe0: 76bbaf08 76bbaef8 00016680 000509d0 r8:80200288 r7:0000016d 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