8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=90627003, *pmd=e2ed7003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 3607 Comm: syz-executor.0 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 : [<804640f4>] lr : [<807da864>] psr: 60000013 sp : eaf89bf8 ip : eaf89c08 fp : eaf89c04 r10: 00000018 r9 : 828544e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 85db9000 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 90753b80 DAC: 00000000 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 85db9000 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 0xeaf88000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Register r12 information: 2-page vmalloc region starting at 0xeaf88000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909 Process syz-executor.0 (pid: 3607, stack limit = 0xeaf88000) Stack: (0xeaf89bf8 to 0xeaf8a000) 9be0: eaf89c3c eaf89c08 9c00: 807da864 804640f4 eaf89c2c eaf89ee8 8024bc7c 85db9000 85db9000 00000000 9c20: 00000000 00000000 00040000 00000018 eaf89c8c eaf89c40 813c9b00 807da778 9c40: 813c9050 802dcd0c 8614f800 8614f8d0 85fbb600 8614f8d8 eaf89ee8 00000000 9c60: 00000000 85fbb600 00040000 8614f800 83df5e00 00000000 00000000 00000000 9c80: eaf89cfc eaf89c90 815e3da8 813c9a1c 00000000 00000002 eaf89ca4 00000000 9ca0: 00000000 00000000 85fbb6a8 8614f8ec 85fbb83c eaf89ed8 00000000 00000000 9cc0: 00000000 00000000 00000000 c6e3a23f 00000000 815e3c58 eaf89ed8 8dc5ea00 9ce0: 00000000 00000000 00000000 eaf89d4c eaf89d1c eaf89d00 815e30e8 815e3c64 9d00: 00000000 00000000 00000000 815e30b0 eaf89d3c eaf89d20 81340630 815e30bc 9d20: eaf89ed8 8dc5ea00 200033c0 00000000 eaf89dfc eaf89d40 81340834 813405ec 9d40: 00000000 00000000 00000001 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 c6e3a23f 00000000 00000000 eaf89ed8 200033c0 9de0: 00000000 8dc5ea00 83df5e00 00000001 eaf89e7c eaf89e00 8134356c 813407b0 9e00: 00000000 00000000 eaf89e6c 00000000 00000000 200003c0 00040000 00000000 9e20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9e40: 00000000 00000000 00000000 00000000 00000000 c6e3a23f eaf89e7c eaf89eb8 9e60: 200033c0 00000000 00000000 00000000 eaf89f5c eaf89e80 81343694 813434f0 9e80: 00000000 eaf89e90 80889dd0 8dc5ea00 00000001 00000000 00000000 00000000 9ea0: 00000000 00000000 00000000 00000000 00000000 00000000 eaf89eb4 83df5e00 9ec0: 00000000 00000000 861e3000 000509d0 00000000 00000000 eaf89d4c 00000000 9ee0: 00000000 00000000 00000005 00000001 00000000 200003c0 00040000 00000000 9f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 9f20: 00000000 00000000 eaf89f44 c6e3a23f 8183ce44 00000003 200033c0 00000000 9f40: 00000000 00000001 83df5e00 0000016d eaf89fa4 eaf89f60 81344064 813435ac 9f60: 00000000 eaf89fb0 00000000 00000000 00000000 00000000 eaf89fac c6e3a23f 9f80: 8020c8d0 00000000 00000000 0014c2c8 0000016d 80200288 00000000 eaf89fa8 9fa0: 80200060 81343fac 00000000 00000000 00000003 200033c0 00000001 00000000 9fc0: 00000000 00000000 0014c2c8 0000016d 7e88132e 7e88132f 003d0f00 76b850fc 9fe0: 76b84f08 76b84ef8 00016680 000509d0 60000010 00000003 00000000 00000000 Backtrace: [<804640e8>] (__kmap_local_page_prot) from [<807da864>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<804640e8>] (__kmap_local_page_prot) from [<807da864>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:479) [<807da76c>] (copy_page_to_iter) from [<813c9b00>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00040000 r8:00000000 r7:00000000 r6:00000000 r5:85db9000 r4:85db9000 [<813c9a10>] (sk_msg_recvmsg) from [<815e3da8>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813c9a10>] (sk_msg_recvmsg) from [<815e3da8>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:83df5e00 r6:8614f800 r5:00040000 r4:85fbb600 [<815e3c58>] (unix_bpf_recvmsg) from [<815e30e8>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2457) r10:eaf89d4c r9:00000000 r8:00000000 r7:00000000 r6:8dc5ea00 r5:eaf89ed8 r4:815e3c58 [<815e30b0>] (unix_dgram_recvmsg) from [<81340630>] (sock_recvmsg_nosec net/socket.c:1044 [inline]) [<815e30b0>] (unix_dgram_recvmsg) from [<81340630>] (sock_recvmsg+0x50/0x78 net/socket.c:1066) r4:815e30b0 [<813405e0>] (sock_recvmsg) from [<81340834>] (____sys_recvmsg+0x90/0x158 net/socket.c:2777) r7:00000000 r6:200033c0 r5:8dc5ea00 r4:eaf89ed8 [<813407a4>] (____sys_recvmsg) from [<8134356c>] (___sys_recvmsg+0x88/0xbc net/socket.c:2819) r10:00000001 r9:83df5e00 r8:8dc5ea00 r7:00000000 r6:200033c0 r5:eaf89ed8 r4:00000000 [<813434e4>] (___sys_recvmsg) from [<81343694>] (do_recvmmsg+0xf4/0x298 net/socket.c:2913) r8:00000000 r7:00000000 r6:00000000 r5:200033c0 r4:eaf89eb8 [<813435a0>] (do_recvmmsg) from [<81344064>] (__sys_recvmmsg net/socket.c:2992 [inline]) [<813435a0>] (do_recvmmsg) from [<81344064>] (__do_sys_recvmmsg_time32 net/socket.c:3026 [inline]) [<813435a0>] (do_recvmmsg) from [<81344064>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3019) r10:0000016d r9:83df5e00 r8:00000001 r7:00000000 r6:00000000 r5:200033c0 r4:00000003 [<81343fa0>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xeaf89fa8 to 0xeaf89ff0) 9fa0: 00000000 00000000 00000003 200033c0 00000001 00000000 9fc0: 00000000 00000000 0014c2c8 0000016d 7e88132e 7e88132f 003d0f00 76b850fc 9fe0: 76b84f08 76b84ef8 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