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Message-ID: <000000000000df5f630620a63b03@google.com> Date: Tue, 27 Aug 2024 01:43:21 -0700 From: syzbot <syzbot+7449cfb801474783f727@...kaller.appspotmail.com> To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, daniel@...earbox.net, davem@...emloft.net, edumazet@...gle.com, jakub@...udflare.com, john.fastabend@...il.com, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com Subject: [syzbot] [bpf?] [net?] BUG: unable to handle kernel NULL pointer dereference in tcp_bpf_sendmsg Hello, syzbot found the following issue on: HEAD commit: 7eb61cc674ee Merge tag 'input-for-v6.11-rc4' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1415747b980000 kernel config: https://syzkaller.appspot.com/x/.config?x=8eee190eab0ebaf5 dashboard link: https://syzkaller.appspot.com/bug?extid=7449cfb801474783f727 compiler: aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/384ffdcca292/non_bootable_disk-7eb61cc6.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/da1f81d9a714/vmlinux-7eb61cc6.xz kernel image: https://storage.googleapis.com/syzbot-assets/18292fa70148/Image-7eb61cc6.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7449cfb801474783f727@...kaller.appspotmail.com Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 user pgtable: 4k pages, 52-bit VAs, pgdp=0000000043fd4f00 [0000000000000000] pgd=080000004882a003, p4d=080000005bba7003, pud=080000004a4bd003, pmd=0000000000000000 Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 0 UID: 0 PID: 23032 Comm: syz.0.5798 Not tainted 6.11.0-rc4-syzkaller-00222-g7eb61cc674ee #0 Hardware name: linux,dummy-virt (DT) pstate: 81400009 (Nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) pc : page_kasan_tag include/linux/mm.h:1816 [inline] pc : lowmem_page_address include/linux/mm.h:2254 [inline] pc : sg_virt include/linux/scatterlist.h:404 [inline] pc : sk_msg_memcopy_from_iter+0x134/0x1e0 net/core/skmsg.c:389 lr : tcp_bpf_sendmsg+0x1f4/0x8d0 net/ipv4/tcp_bpf.c:541 sp : ffff800088013720 x29: ffff800088013720 x28: faf0000010f136c0 x27: fcf000001bb93200 x26: 000000000000018c x25: fdf00000242bc400 x24: 0000000000000001 x23: 0000000000000000 x22: ffff801000000000 x21: 00003e0040000000 x20: fff0000000000000 x19: ffff800088013da0 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000020001100 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 x11: f8f0000008d11ce0 x10: 0000000000000000 x9 : 0000000000000000 x8 : ffff800088013af8 x7 : 0000000000000000 x6 : 000000000000003f x5 : 0000000000000000 x4 : fdf00000242bc440 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000000000 Call trace: arch_static_branch_jump arch/arm64/include/asm/jump_label.h:46 [inline] kasan_enabled include/linux/kasan-enabled.h:13 [inline] page_kasan_tag include/linux/mm.h:1815 [inline] lowmem_page_address include/linux/mm.h:2254 [inline] sg_virt include/linux/scatterlist.h:404 [inline] sk_msg_memcopy_from_iter+0x134/0x1e0 net/core/skmsg.c:389 tcp_bpf_sendmsg+0x1f4/0x8d0 net/ipv4/tcp_bpf.c:541 inet6_sendmsg+0x44/0x70 net/ipv6/af_inet6.c:661 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x54/0x60 net/socket.c:745 ____sys_sendmsg+0x274/0x2ac net/socket.c:2597 ___sys_sendmsg+0xac/0x100 net/socket.c:2651 __sys_sendmsg+0x84/0xe0 net/socket.c:2680 __do_sys_sendmsg net/socket.c:2689 [inline] __se_sys_sendmsg net/socket.c:2687 [inline] __arm64_sys_sendmsg+0x24/0x30 net/socket.c:2687 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x48/0x110 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:151 el0_svc+0x34/0xec arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:598 Code: d346fed6 1a9a92f7 8b163296 d503201f (f9400001) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: d346fed6 lsr x22, x22, #6 4: 1a9a92f7 csel w23, w23, w26, ls // ls = plast 8: 8b163296 add x22, x20, x22, lsl #12 c: d503201f nop * 10: f9400001 ldr x1, [x0] <-- trapping instruction --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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