8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=89f76003, *pmd=e15ef003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 3372 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 : [<8046ae80>] lr : [<807e0a4c>] psr: 60000013 sp : e0625c00 ip : e0625c10 fp : e0625c0c r10: 00000018 r9 : 828574e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8647f000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 89542480 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 8647f000 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 0xe0624000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Register r12 information: 2-page vmalloc region starting at 0xe0624000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907 Process syz-executor.0 (pid: 3372, stack limit = 0xe0624000) Stack: (0xe0625c00 to 0xe0626000) 5c00: e0625c44 e0625c10 807e0a4c 8046ae80 e0625c34 e0625ef0 8024c610 8647f000 5c20: 8647f000 00000000 00000001 00000000 00033fe0 00000018 e0625c94 e0625c48 5c40: 813d9160 807e0960 00010440 84614000 89ff6000 89ff60d0 83e34c00 89ff60d8 5c60: e0625ef0 00000000 00000000 83e34c00 00033fe0 89ff6000 83cf6c00 00000000 5c80: 00000000 00000000 e0625d04 e0625c98 815f5644 813d907c 00000000 00000002 5ca0: e0625cac 00000000 00000000 00000000 83e34ca8 89ff60ec 83e34e3c e0625ee0 5cc0: 00000000 00000000 00000000 00000000 00000000 ab703d9d 00000000 815f54f4 5ce0: e0625ee0 833dea00 00000000 00000000 00000000 e0625d54 e0625d24 e0625d08 5d00: 815f4984 815f5500 00000000 00000000 00000000 815f494c e0625d44 e0625d28 5d20: 8134e7ec 815f4958 e0625ee0 833dea00 200033c0 00000000 e0625e04 e0625d48 5d40: 8134e9f0 8134e7a8 00000000 00000000 00000001 00000000 00000000 00000000 5d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5da0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5dc0: 00000000 00000000 00000000 00000000 00000000 ab703d9d 00000000 00000000 5de0: e0625ee0 200033c0 00000000 833dea00 83cf6c00 00000001 e0625e84 e0625e08 5e00: 81351924 8134e96c 00000000 00000000 80314580 00000000 00000000 200003c0 5e20: 00033fe0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 ab703d9d 5e60: e0625e84 e0625ec0 200033c0 00000000 00000000 00000000 e0625f5c e0625e88 5e80: 81351a4c 813518a8 00000000 e0625e98 80891e5c 833dea00 00000001 00000000 5ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 5ec0: 00000000 00000000 000509d0 00000000 00000000 00000000 e0625f04 e0625ee8 5ee0: e0625d54 00000000 00000000 00000000 00000000 00000001 200003c0 00033fdf 5f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 5f20: 00000000 00000000 e0625f44 ab703d9d 81850e44 00000003 200033c0 00000000 5f40: 00000000 00000001 83cf6c00 0000016d e0625fa4 e0625f60 8135241c 81351964 5f60: 00000000 e0625fb0 00000000 00000000 00000000 00000000 e0625fac ab703d9d 5f80: 8020c9bc 00000000 00000000 0014c2c8 0000016d 80200288 00000000 e0625fa8 5fa0: 80200060 81352364 00000000 00000000 00000003 200033c0 00000001 00000000 5fc0: 00000000 00000000 0014c2c8 0000016d 7ef8f32e 7ef8f32f 003d0f00 76b2d0fc 5fe0: 76b2cf08 76b2cef8 00016680 000509d0 60000010 00000003 00000000 00000000 Backtrace: [<8046ae74>] (__kmap_local_page_prot) from [<807e0a4c>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046ae74>] (__kmap_local_page_prot) from [<807e0a4c>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807e0954>] (copy_page_to_iter) from [<813d9160>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00033fe0 r8:00000000 r7:00000001 r6:00000000 r5:8647f000 r4:8647f000 [<813d9070>] (sk_msg_recvmsg) from [<815f5644>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d9070>] (sk_msg_recvmsg) from [<815f5644>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:83cf6c00 r6:89ff6000 r5:00033fe0 r4:83e34c00 [<815f54f4>] (unix_bpf_recvmsg) from [<815f4984>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2485) r10:e0625d54 r9:00000000 r8:00000000 r7:00000000 r6:833dea00 r5:e0625ee0 r4:815f54f4 [<815f494c>] (unix_dgram_recvmsg) from [<8134e7ec>] (sock_recvmsg_nosec net/socket.c:1044 [inline]) [<815f494c>] (unix_dgram_recvmsg) from [<8134e7ec>] (sock_recvmsg+0x50/0x78 net/socket.c:1066) r4:815f494c [<8134e79c>] (sock_recvmsg) from [<8134e9f0>] (____sys_recvmsg+0x90/0x158 net/socket.c:2807) r7:00000000 r6:200033c0 r5:833dea00 r4:e0625ee0 [<8134e960>] (____sys_recvmsg) from [<81351924>] (___sys_recvmsg+0x88/0xbc net/socket.c:2849) r10:00000001 r9:83cf6c00 r8:833dea00 r7:00000000 r6:200033c0 r5:e0625ee0 r4:00000000 [<8135189c>] (___sys_recvmsg) from [<81351a4c>] (do_recvmmsg+0xf4/0x298 net/socket.c:2943) r8:00000000 r7:00000000 r6:00000000 r5:200033c0 r4:e0625ec0 [<81351958>] (do_recvmmsg) from [<8135241c>] (__sys_recvmmsg net/socket.c:3022 [inline]) [<81351958>] (do_recvmmsg) from [<8135241c>] (__do_sys_recvmmsg_time32 net/socket.c:3056 [inline]) [<81351958>] (do_recvmmsg) from [<8135241c>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3049) r10:0000016d r9:83cf6c00 r8:00000001 r7:00000000 r6:00000000 r5:200033c0 r4:00000003 [<81352358>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xe0625fa8 to 0xe0625ff0) 5fa0: 00000000 00000000 00000003 200033c0 00000001 00000000 5fc0: 00000000 00000000 0014c2c8 0000016d 7ef8f32e 7ef8f32f 003d0f00 76b2d0fc 5fe0: 76b2cf08 76b2cef8 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