8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=853cf003, *pmd=fbf55003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 7520 Comm: syz-executor.0 Not tainted 6.8.0-rc1-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 : [<8046d03c>] lr : [<807d3670>] psr: 60000013 sp : eb19dc00 ip : eb19dc10 fp : eb19dc0c r10: 00000018 r9 : 8284f4e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 84f4d400 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85116a00 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 84f4d400 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 0xeb19c000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Register r12 information: 2-page vmalloc region starting at 0xeb19c000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Process syz-executor.0 (pid: 7520, stack limit = 0xeb19c000) Stack: (0xeb19dc00 to 0xeb19e000) dc00: eb19dc44 eb19dc10 807d3670 8046d03c eb19dc34 eb19def0 8024c824 84f4d400 dc20: 84f4d400 00000000 00000001 00000000 000000b0 00000018 eb19dc94 eb19dc48 dc40: 813d8bac 807d3584 00000000 88885736 851c8000 851c80d0 84936d00 851c80d8 dc60: eb19def0 00000002 eb19dcec 84936d00 000000b0 851c8000 853d5400 00000000 dc80: 40000142 00000040 eb19dd04 eb19dc98 815f6df0 813d8ac8 40000142 00000000 dca0: 00000000 00000000 00000000 00000000 84936da8 851c80ec 84936f34 eb19dee0 dcc0: 00000000 88885736 01afc258 821907f4 40000142 88885736 eb19dee0 815f6ca0 dce0: eb19dee0 8328e500 40000142 00000000 40000142 eb19dd54 eb19dd24 eb19dd08 dd00: 815f6130 815f6cac 00000000 40000142 00000000 815f60f8 eb19dd44 eb19dd28 dd20: 8134bc68 815f6104 eb19dee0 8328e500 200033c0 00000000 eb19de04 eb19dd48 dd40: 8134be6c 8134bc24 00000000 00000000 00000001 00000000 00000000 00000000 dd60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dd80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dda0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 ddc0: 00000000 00000000 00000000 00000000 00000000 88885736 00000000 00000000 dde0: eb19dee0 200033c0 40000142 8328e500 853d5400 0000006e eb19de84 eb19de08 de00: 8134ed84 8134bde8 40000142 00000000 80314d50 00000000 00000000 200003c0 de20: 000000b0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 de40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 88885736 de60: eb19de84 eb19dec0 200033c0 00000000 40010142 00000000 eb19df5c eb19de88 de80: 8134eeac 8134ed08 00000000 eb19de98 80884bd0 8328e500 00000001 00000000 dea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dec0: 00000000 00000000 00050bd0 00000000 00000000 00000000 eb19df04 eb19dee8 dee0: eb19dd54 00000000 00000000 00000000 00000000 00000001 200003c0 000000af df00: 00000001 00000000 00000000 00000001 40000000 00000000 00000000 00000000 df20: 00000000 00000000 eb19df44 88885736 818550f8 00000003 200033c0 00000000 df40: 40010142 0000006e 853d5400 0000016d eb19dfa4 eb19df60 8134f87c 8134edc4 df60: 00000000 eb19dfb0 00000000 00000000 00000000 00000000 eb19dfac 88885736 df80: 8020ca34 00000000 00000000 0014c2d0 0000016d 80200288 00000000 eb19dfa8 dfa0: 80200060 8134f7c4 00000000 00000000 00000003 200033c0 0000006e 40010142 dfc0: 00000000 00000000 0014c2d0 0000016d 7ef5b326 7ef5b327 003d0f00 76b350fc dfe0: 76b34f08 76b34ef8 000167e8 00050bd0 60000010 00000003 00000000 00000000 Backtrace: [<8046d030>] (__kmap_local_page_prot) from [<807d3670>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046d030>] (__kmap_local_page_prot) from [<807d3670>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807d3578>] (copy_page_to_iter) from [<813d8bac>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:000000b0 r8:00000000 r7:00000001 r6:00000000 r5:84f4d400 r4:84f4d400 [<813d8abc>] (sk_msg_recvmsg) from [<815f6df0>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d8abc>] (sk_msg_recvmsg) from [<815f6df0>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000040 r9:40000142 r8:00000000 r7:853d5400 r6:851c8000 r5:000000b0 r4:84936d00 [<815f6ca0>] (unix_bpf_recvmsg) from [<815f6130>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2483) r10:eb19dd54 r9:40000142 r8:00000000 r7:40000142 r6:8328e500 r5:eb19dee0 r4:815f6ca0 [<815f60f8>] (unix_dgram_recvmsg) from [<8134bc68>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f60f8>] (unix_dgram_recvmsg) from [<8134bc68>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f60f8 [<8134bc18>] (sock_recvmsg) from [<8134be6c>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:200033c0 r5:8328e500 r4:eb19dee0 [<8134bddc>] (____sys_recvmsg) from [<8134ed84>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:0000006e r9:853d5400 r8:8328e500 r7:40000142 r6:200033c0 r5:eb19dee0 r4:00000000 [<8134ecfc>] (___sys_recvmsg) from [<8134eeac>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:40010142 r6:00000000 r5:200033c0 r4:eb19dec0 [<8134edb8>] (do_recvmmsg) from [<8134f87c>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<8134edb8>] (do_recvmmsg) from [<8134f87c>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<8134edb8>] (do_recvmmsg) from [<8134f87c>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:853d5400 r8:0000006e r7:40010142 r6:00000000 r5:200033c0 r4:00000003 [<8134f7b8>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xeb19dfa8 to 0xeb19dff0) dfa0: 00000000 00000000 00000003 200033c0 0000006e 40010142 dfc0: 00000000 00000000 0014c2d0 0000016d 7ef5b326 7ef5b327 003d0f00 76b350fc dfe0: 76b34f08 76b34ef8 000167e8 00050bd0 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