8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=8d061003, *pmd=e17b3003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 28836 Comm: syz-executor.1 Not tainted 6.6.0-rc5-syzkaller #0 Hardware name: ARM-Versatile Express PC is at page_zonenum include/linux/mmzone.h:1086 [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:479 pc : [<804640ec>] lr : [<807da85c>] psr: 60000013 sp : eaae9c18 ip : eaae9c28 fp : eaae9c24 r10: 00000018 r9 : 828544e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8a2c1000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8d89c100 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 8a2c1000 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 0xeaae8000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Register r12 information: 2-page vmalloc region starting at 0xeaae8000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Process syz-executor.1 (pid: 28836, stack limit = 0xeaae8000) Stack: (0xeaae9c18 to 0xeaaea000) 9c00: eaae9c5c eaae9c28 9c20: 807da85c 804640ec eaae9c4c eaae9ee8 8024bc7c 8a2c1000 8a2c1000 00000000 9c40: 00000000 00000000 00000130 00000018 eaae9cac eaae9c60 813c9a60 807da770 9c60: 40000013 848751c0 83906a00 83906ad0 87e3db00 83906ad8 eaae9ee8 00000000 9c80: eaae9cac 87e3db00 00000130 83906a00 82e7d240 00000001 00000000 00000000 9ca0: eaae9d1c eaae9cb0 815e3d08 813c997c 00000000 eaae9ed8 00000000 83906ad0 9cc0: 83906ac0 7fffffff 87e3dba8 83906aec 87e3dd3c eaae9ed8 00000000 82e7d240 9ce0: 8029fc50 00000100 00000122 842bec78 eaae9d1c 815e3bb8 84875180 20000fe0 9d00: 815e3010 20000cc0 00000000 eaae9d4c eaae9d3c eaae9d20 815e3048 815e3bc4 9d20: 00000000 eaae9e14 eaae9d5c eaae9ed8 eaae9dfc eaae9d40 8134083c 815e301c 9d40: 00000002 20000ec0 00000000 00000000 00000000 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 842bec78 20000ec0 00000000 eaae9ed8 20000fe0 9de0: 00000000 84875180 82e7d240 00000002 eaae9e7c eaae9e00 813434d0 81340714 9e00: 00000000 00000001 eaae9e6c 00000000 20000cc0 20000d40 000000da 20001040 9e20: 00000056 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e40: 00000000 00000000 00000000 00000000 00000000 842bec78 eaae9e7c eaae9eb8 9e60: 20000fe0 00000001 00000000 00000000 eaae9f5c eaae9e80 813435f8 81343454 9e80: 00000001 eaae9e90 80889dc8 84875180 00000001 00000000 00000000 00000000 9ea0: 00000000 00000000 00000000 00000000 00000000 00000000 eaae9eb4 82e7d240 9ec0: 00000000 00000000 892c0600 000509d0 00000000 00000000 eaae9d4c 00000000 9ee0: 00000000 00000000 00000000 00000001 00000000 eaae9e14 00000130 00000000 9f00: 00000002 00000000 20000ec0 00000001 00000000 000000f6 00000000 00000000 9f20: 00000000 00000000 eaae9f44 842bec78 8183cda4 00000003 20000fc0 00000000 9f40: 00000000 00000002 82e7d240 0000016d eaae9fa4 eaae9f60 81343fc8 81343510 9f60: 00000000 eaae9fb0 00000000 00000000 00000000 00000000 eaae9fac 842bec78 9f80: 8020c8d0 00000000 00000000 0014c2c8 0000016d 80200288 00000000 eaae9fa8 9fa0: 80200060 81343f10 00000000 00000000 00000003 20000fc0 00000002 00000000 9fc0: 00000000 00000000 0014c2c8 0000016d 7edd332e 7edd332f 003d0f00 76b0b0fc 9fe0: 76b0af08 76b0aef8 00016680 000509d0 60000010 00000003 00000000 00000000 Backtrace: [<804640e0>] (__kmap_local_page_prot) from [<807da85c>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<804640e0>] (__kmap_local_page_prot) from [<807da85c>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:479) [<807da764>] (copy_page_to_iter) from [<813c9a60>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00000130 r8:00000000 r7:00000000 r6:00000000 r5:8a2c1000 r4:8a2c1000 [<813c9970>] (sk_msg_recvmsg) from [<815e3d08>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813c9970>] (sk_msg_recvmsg) from [<815e3d08>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000001 r7:82e7d240 r6:83906a00 r5:00000130 r4:87e3db00 [<815e3bb8>] (unix_bpf_recvmsg) from [<815e3048>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2457) r10:eaae9d4c r9:00000000 r8:20000cc0 r7:815e3010 r6:20000fe0 r5:84875180 r4:815e3bb8 [<815e3010>] (unix_dgram_recvmsg) from [<8134083c>] (sock_recvmsg_nosec net/socket.c:1044 [inline]) [<815e3010>] (unix_dgram_recvmsg) from [<8134083c>] (____sys_recvmsg+0x134/0x158 net/socket.c:2775) r4:eaae9ed8 [<81340708>] (____sys_recvmsg) from [<813434d0>] (___sys_recvmsg+0x88/0xbc net/socket.c:2819) r10:00000002 r9:82e7d240 r8:84875180 r7:00000000 r6:20000fe0 r5:eaae9ed8 r4:00000000 [<81343448>] (___sys_recvmsg) from [<813435f8>] (do_recvmmsg+0xf4/0x298 net/socket.c:2913) r8:00000000 r7:00000000 r6:00000001 r5:20000fe0 r4:eaae9eb8 [<81343504>] (do_recvmmsg) from [<81343fc8>] (__sys_recvmmsg net/socket.c:2992 [inline]) [<81343504>] (do_recvmmsg) from [<81343fc8>] (__do_sys_recvmmsg_time32 net/socket.c:3026 [inline]) [<81343504>] (do_recvmmsg) from [<81343fc8>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3019) r10:0000016d r9:82e7d240 r8:00000002 r7:00000000 r6:00000000 r5:20000fc0 r4:00000003 [<81343f04>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xeaae9fa8 to 0xeaae9ff0) 9fa0: 00000000 00000000 00000003 20000fc0 00000002 00000000 9fc0: 00000000 00000000 0014c2c8 0000016d 7edd332e 7edd332f 003d0f00 76b0b0fc 9fe0: 76b0af08 76b0aef8 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