8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [00000000] *pgd=960ca003, *pmd=feb87003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 9217 Comm: syz-executor.0 Not tainted 6.8.0-rc6-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 : [<8046d124>] lr : [<807d2c88>] psr: 60000013 sp : ecca1c00 ip : ecca1c10 fp : ecca1c0c r10: 00000018 r9 : 828504e8 r8 : 00000000 r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 8511ac00 r3 : 00c00000 r2 : 0000071f r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8563cc00 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 8511ac00 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 0xecca0000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Register r12 information: 2-page vmalloc region starting at 0xecca0000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2902 Process syz-executor.0 (pid: 9217, stack limit = 0xecca0000) Stack: (0xecca1c00 to 0xecca2000) 1c00: ecca1c44 ecca1c10 807d2c88 8046d124 00000000 ecca1ef0 00000000 8511ac00 1c20: 8511ac00 00000000 00000000 00000000 00022fe0 00000018 ecca1c94 ecca1c48 1c40: 813d95c8 807d2b9c 00000000 fc410453 850dc400 850dc4d0 837fc900 850dc4d8 1c60: ecca1ef0 00000000 ecca1cec 837fc900 00022fe0 850dc400 834b1800 00000000 1c80: 00000000 00000000 ecca1d04 ecca1c98 815f7ed8 813d94e4 00000000 00000000 1ca0: 00000000 00000000 00000000 00000000 837fc9a8 850dc4ec 837fcb34 ecca1ee0 1cc0: 00000000 fc410453 01b0f577 821907f4 00000000 fc410453 ecca1ee0 815f7d88 1ce0: ecca1ee0 848c0780 00000000 00000000 00000000 ecca1d54 ecca1d24 ecca1d08 1d00: 815f71fc 815f7d94 00000000 00000000 00000000 815f71c4 ecca1d44 ecca1d28 1d20: 8134c638 815f71d0 ecca1ee0 848c0780 200033c0 00000000 ecca1e04 ecca1d48 1d40: 8134c83c 8134c5f4 00000000 00000000 00000001 00000000 00000000 00000000 1d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1d80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1da0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1dc0: 00000000 00000000 00000000 00000000 00000000 fc410453 00000000 00000000 1de0: ecca1ee0 200033c0 00000000 848c0780 834b1800 00000001 ecca1e84 ecca1e08 1e00: 8134f754 8134c7b8 00000000 00000000 80314db0 00000000 00000000 200003c0 1e20: 00022fe0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 fc410453 1e60: ecca1e84 ecca1ec0 200033c0 00000000 00000000 00000000 ecca1f5c ecca1e88 1e80: 8134f87c 8134f6d8 00000000 ecca1e98 808841e8 848c0780 00000001 00000000 1ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1ec0: 00000000 00000000 00050bb0 00000000 00000000 00000000 ecca1f04 ecca1ee8 1ee0: ecca1d54 00000000 00000000 00000000 00000000 00000000 200003c0 00022fe0 1f00: 00000001 00000000 00000000 00000001 00000000 00000000 00000000 00000000 1f20: 00000000 00000000 ecca1f44 fc410453 81856d20 00000003 200033c0 00000000 1f40: 00000000 00000001 834b1800 0000016d ecca1fa4 ecca1f60 8135024c 8134f794 1f60: 00000000 ecca1fb0 00000000 00000000 00000000 00000000 ecca1fac fc410453 1f80: 8020ca34 00000000 00000000 0014c2d0 0000016d 80200288 00000000 ecca1fa8 1fa0: 80200060 81350194 00000000 00000000 00000003 200033c0 00000001 00000000 1fc0: 00000000 00000000 0014c2d0 0000016d 7ef8832e 7ef8832f 003d0f00 76b090fc 1fe0: 76b08f08 76b08ef8 000167e8 00050bb0 60000010 00000003 00000000 00000000 Backtrace: [<8046d118>] (__kmap_local_page_prot) from [<807d2c88>] (kmap_local_page include/linux/highmem-internal.h:73 [inline]) [<8046d118>] (__kmap_local_page_prot) from [<807d2c88>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:379) [<807d2b90>] (copy_page_to_iter) from [<813d95c8>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437) r10:00000018 r9:00022fe0 r8:00000000 r7:00000000 r6:00000000 r5:8511ac00 r4:8511ac00 [<813d94d8>] (sk_msg_recvmsg) from [<815f7ed8>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline]) [<813d94d8>] (sk_msg_recvmsg) from [<815f7ed8>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50) r10:00000000 r9:00000000 r8:00000000 r7:834b1800 r6:850dc400 r5:00022fe0 r4:837fc900 [<815f7d88>] (unix_bpf_recvmsg) from [<815f71fc>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2468) r10:ecca1d54 r9:00000000 r8:00000000 r7:00000000 r6:848c0780 r5:ecca1ee0 r4:815f7d88 [<815f71c4>] (unix_dgram_recvmsg) from [<8134c638>] (sock_recvmsg_nosec net/socket.c:1046 [inline]) [<815f71c4>] (unix_dgram_recvmsg) from [<8134c638>] (sock_recvmsg+0x50/0x78 net/socket.c:1068) r4:815f71c4 [<8134c5e8>] (sock_recvmsg) from [<8134c83c>] (____sys_recvmsg+0x90/0x158 net/socket.c:2803) r7:00000000 r6:200033c0 r5:848c0780 r4:ecca1ee0 [<8134c7ac>] (____sys_recvmsg) from [<8134f754>] (___sys_recvmsg+0x88/0xbc net/socket.c:2845) r10:00000001 r9:834b1800 r8:848c0780 r7:00000000 r6:200033c0 r5:ecca1ee0 r4:00000000 [<8134f6cc>] (___sys_recvmsg) from [<8134f87c>] (do_recvmmsg+0xf4/0x298 net/socket.c:2939) r8:00000000 r7:00000000 r6:00000000 r5:200033c0 r4:ecca1ec0 [<8134f788>] (do_recvmmsg) from [<8135024c>] (__sys_recvmmsg net/socket.c:3018 [inline]) [<8134f788>] (do_recvmmsg) from [<8135024c>] (__do_sys_recvmmsg_time32 net/socket.c:3052 [inline]) [<8134f788>] (do_recvmmsg) from [<8135024c>] (sys_recvmmsg_time32+0xc4/0xd8 net/socket.c:3045) r10:0000016d r9:834b1800 r8:00000001 r7:00000000 r6:00000000 r5:200033c0 r4:00000003 [<81350188>] (sys_recvmmsg_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66) Exception stack(0xecca1fa8 to 0xecca1ff0) 1fa0: 00000000 00000000 00000003 200033c0 00000001 00000000 1fc0: 00000000 00000000 0014c2d0 0000016d 7ef8832e 7ef8832f 003d0f00 76b090fc 1fe0: 76b08f08 76b08ef8 000167e8 00050bb0 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