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AJvYcCVHeKnRlFVGAwsv8j+k25lXyT58F4ODiVkzrBrm9MrgZJffBOFu3RLLGoyJQTqfptAqWrc7y34IvVygey+L83e+XBixaH0s1jdOo9qZ X-Gm-Message-State: AOJu0YzxPBgfIpGNGfE9IAx1Q4U76ed0Ex4Qx2IukdZ8Q2u+jNeuGRxO AFZvQDk9gZZ5ExXlcOTv7gtGCxk3ouwTAJM6Mj859kLoSjOnbMWOiB0NuIGITkZktfvNlfcDEtU Zq0X6sBe9DVewX7ewwdplEYHkIt75vMtFt7Jo2fUxOCxoXcOk+MR4MPM= X-Google-Smtp-Source: AGHT+IFo+a9aOKmVUIwfIgGAF4Uwhc+vC5qgBFqFKsXTsqFQtmevQ32MLjoLsdIUy0ExrAq9dpzZCkhto3YZ+lYZ6zyqpzQHbEq8 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6638:860f:b0:482:e69d:b0c6 with SMTP id iu15-20020a056638860f00b00482e69db0c6mr910332jab.6.1713228722081; Mon, 15 Apr 2024 17:52:02 -0700 (PDT) Date: Mon, 15 Apr 2024 17:52:02 -0700 In-Reply-To: <661dc844.2e0a0220.ae23e.1016@mx.google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000066253406162c2536@google.com> Subject: Re: [syzbot] [bpf?] [net?] BUG: unable to handle kernel NULL pointer dereference in sk_msg_recvmsg From: syzbot To: andrew.kanner@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: BUG: unable to handle kernel NULL pointer dereference in sk_msg_recvmsg 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, 48-bit VAs, pgdp=0000000043940000 [0000000000000000] pgd=08000000468bd003, p4d=08000000468bd003, pud=0800000046ab8003, pmd=0000000000000000 Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 3479 Comm: syz-executor.0 Not tainted 6.9.0-rc4-syzkaller-g96fca68c4fbf #0 Hardware name: linux,dummy-virt (DT) pstate: 61401009 (nZCv daif +PAN -UAO -TCO +DIT +SSBS BTYPE=--) pc : page_kasan_tag include/linux/mm.h:1834 [inline] pc : lowmem_page_address include/linux/mm.h:2234 [inline] pc : kmap_local_page include/linux/highmem-internal.h:185 [inline] pc : copy_page_to_iter+0xb4/0x154 lib/iov_iter.c:360 lr : sk_msg_recvmsg+0xf8/0x37c net/core/skmsg.c:437 sp : ffff80008964b940 x29: ffff80008964b940 x28: 0000000000000000 x27: f1ff000005cd9800 x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000 x23: 0000000000000000 x22: 0000020040000000 x21: ffff000000000000 x20: 0000000000001000 x19: ffff80008964bd50 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000382 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000001 x10: 382d7d5bed6f0326 x9 : a9c46d8380c16462 x8 : fdff0000056d6bc8 x7 : 0000000000000000 x6 : fdff000005cd6d40 x5 : 0000000000000001 x4 : 0000000000000000 x3 : ffff80008964bd50 x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff801000000000 Call trace: arch_static_branch_jump arch/arm64/include/asm/jump_label.h:38 [inline] kasan_enabled include/linux/kasan-enabled.h:13 [inline] page_kasan_tag include/linux/mm.h:1833 [inline] lowmem_page_address include/linux/mm.h:2234 [inline] kmap_local_page include/linux/highmem-internal.h:185 [inline] copy_page_to_iter+0xb4/0x154 lib/iov_iter.c:360 sk_msg_recvmsg+0xf8/0x37c net/core/skmsg.c:437 unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline] unix_bpf_recvmsg+0x13c/0x4f0 net/unix/unix_bpf.c:50 unix_dgram_recvmsg+0x30/0x4c net/unix/af_unix.c:2529 sock_recvmsg_nosec net/socket.c:1046 [inline] sock_recvmsg net/socket.c:1068 [inline] sock_recvmsg net/socket.c:1064 [inline] ____sys_recvmsg+0x1d0/0x268 net/socket.c:2803 ___sys_recvmsg+0x90/0xe8 net/socket.c:2845 do_recvmmsg+0xc8/0x2f8 net/socket.c:2939 __sys_recvmmsg net/socket.c:3018 [inline] __do_sys_recvmmsg net/socket.c:3041 [inline] __se_sys_recvmmsg net/socket.c:3034 [inline] __arm64_sys_recvmmsg+0xd0/0xec net/socket.c:3034 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x48/0x118 arch/arm64/kernel/syscall.c:48 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:133 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:152 el0_svc+0x34/0xf8 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: 8b160320 d346fc00 8b0032a0 d503201f (f9400323) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 8b160320 add x0, x25, x22 4: d346fc00 lsr x0, x0, #6 8: 8b0032a0 add x0, x21, x0, lsl #12 c: d503201f nop * 10: f9400323 ldr x3, [x25] <-- trapping instruction Tested on: commit: 96fca68c Merge tag 'nfsd-6.9-3' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16572cc3180000 kernel config: https://syzkaller.appspot.com/x/.config?x=4ba795506e24be71 dashboard link: https://syzkaller.appspot.com/bug?extid=84f695756ed0c4bb3aba compiler: aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 Note: no patches were applied.