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([2620:10d:c090:500::5:b7ce]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-28e8d113036sm172499855ad.27.2025.10.07.11.35.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Oct 2025 11:35:55 -0700 (PDT) Message-ID: <0a5b15d6a4a0115648e955ea642978e467520bfe.camel@gmail.com> Subject: Re: [syzbot] [bpf?] KASAN: invalid-access Write in do_bad_area From: Eduard Zingerman To: syzbot , andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, haoluo@google.com, john.fastabend@gmail.com, jolsa@kernel.org, kpsingh@kernel.org, linux-kernel@vger.kernel.org, martin.lau@linux.dev, sdf@fomichev.me, song@kernel.org, syzkaller-bugs@googlegroups.com, yonghong.song@linux.dev Date: Tue, 07 Oct 2025 11:35:53 -0700 In-Reply-To: <68e52a94.a00a0220.298cc0.047c.GAE@google.com> References: <68e52a94.a00a0220.298cc0.047c.GAE@google.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-1.fc42) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2025-10-07 at 07:58 -0700, syzbot wrote: > syzbot has found a reproducer for the following issue on: >=20 > HEAD commit: c746c3b51698 Merge tag 'for-6.18-tag' of git://git.kernel= ... > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=3D149b5a7c58000= 0 > kernel config: https://syzkaller.appspot.com/x/.config?x=3Df49b7d923ce86= 7a > dashboard link: https://syzkaller.appspot.com/bug?extid=3D997752115a851cb= 0cf36 > compiler: aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (= GNU Binutils for Debian) 2.40 > userspace arch: arm64 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D17ee792f980= 000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D163955cd98000= 0 >=20 > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/f= a3fbcfdac58/non_bootable_disk-c746c3b5.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/85796940f78d/vmlinu= x-c746c3b5.xz > kernel image: https://storage.googleapis.com/syzbot-assets/1d82d6550867/I= mage-c746c3b5.gz.xz >=20 > IMPORTANT: if you fix the issue, please add the following tag to the comm= it: > Reported-by: syzbot+997752115a851cb0cf36@syzkaller.appspotmail.com >=20 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > BUG: KASAN: invalid-access in __memcpy+0xc/0x54 arch/arm64/lib/memcpy.S:2= 50 > Write at addr f0ff800083d6d268 by task syz.2.17/3596 > Pointer tag: [f0], memory tag: [fe] >=20 > CPU: 1 UID: 0 PID: 3596 Comm: syz.2.17 Not tainted syzkaller #0 PREEMPT= =20 > Hardware name: linux,dummy-virt (DT) > Call trace: > show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:499 (C) > __dump_stack lib/dump_stack.c:94 [inline] > dump_stack_lvl+0x78/0x90 lib/dump_stack.c:120 > print_address_description mm/kasan/report.c:378 [inline] > print_report+0x108/0x61c mm/kasan/report.c:482 > kasan_report+0x88/0xac mm/kasan/report.c:595 > report_tag_fault arch/arm64/mm/fault.c:326 [inline] > do_tag_recovery arch/arm64/mm/fault.c:338 [inline] > __do_kernel_fault+0x170/0x1c8 arch/arm64/mm/fault.c:380 > do_bad_area+0x68/0x78 arch/arm64/mm/fault.c:480 > do_tag_check_fault+0x34/0x44 arch/arm64/mm/fault.c:853 > do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:929 > el1_abort+0x44/0x68 arch/arm64/kernel/entry-common.c:325 > el1h_64_sync_handler+0x50/0xac arch/arm64/kernel/entry-common.c:459 > el1h_64_sync+0x6c/0x70 arch/arm64/kernel/entry.S:591 > __memcpy+0xc/0x54 arch/arm64/lib/memcpy.S:250 (P) > do_misc_fixups+0x174/0x1aac kernel/bpf/verifier.c:22553 > bpf_check+0x1348/0x2a24 kernel/bpf/verifier.c:24686 > bpf_prog_load+0x63c/0xcd4 kernel/bpf/syscall.c:3062 > __sys_bpf+0x2e0/0x1a88 kernel/bpf/syscall.c:6134 > __do_sys_bpf kernel/bpf/syscall.c:6244 [inline] > __se_sys_bpf kernel/bpf/syscall.c:6242 [inline] > __arm64_sys_bpf+0x24/0x34 kernel/bpf/syscall.c:6242 > __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+0x34/0x10c arch/arm64/kernel/entry-common.c:744 > el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:763 > el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:596 >=20 > The buggy address belongs to a 1-page vmalloc region starting at 0xf0ff80= 0083d6d000 allocated at bpf_check+0x8c/0x2a24 kernel/bpf/verifier.c:24529 > The buggy address belongs to the physical page: > page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x544b= 2 > flags: 0x1fffc0000000000(node=3D0|zone=3D0|lastcpupid=3D0x7ff|kasantag=3D= 0xf) > raw: 01fffc0000000000 0000000000000000 dead000000000122 0000000000000000 > raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 > page dumped because: kasan: bad access detected >=20 > Memory state around the buggy address: > ffff800083d6d000: f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 > ffff800083d6d100: f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 f0 fe fe fe fe > > ffff800083d6d200: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe > ^ > ffff800083d6d300: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe > ffff800083d6d400: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D fwiw, can't reproduce this on x86.