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AJvYcCUE7thIl6I40i1Vp/rwuAFi7cX3h1Q9psCDhvHdyjFWCYyj2GNo4VLyB192NcU+wOKATGhSArmAe5569e4=@vger.kernel.org X-Gm-Message-State: AOJu0YyI3lbKWKGHjZa3LaE1R2y50HuzZ8Od+PUlCDu0r9CvB3G6HEsv 69orjrNaQtUJ7qsPU0G0/QODBC62DokoWfe2GJnYdK5DNZ3sRNZK82VB3Krti/aZFYoMAKtf6E8 zHc13S6MvPMxB+wXHRk1VfyHn1BRjrkwakucfu6tKiLk64ZLTlgk/OkBbESY= X-Google-Smtp-Source: AGHT+IFAMXk9B3RkaqHBAZ9jULTRRaMTcn/LZjHSjolC/THXWawUebW7OQ8BUHk5WzPiu2EzGdyyq+m8EWNNHfhtsBXcN1kTUepQ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:174a:b0:427:5e1d:4200 with SMTP id e9e14a558f8ab-42e7ad995a0mr242929655ab.29.1759849108180; Tue, 07 Oct 2025 07:58:28 -0700 (PDT) Date: Tue, 07 Oct 2025 07:58:28 -0700 In-Reply-To: <68e243a2.050a0220.1696c6.007d.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68e52a94.a00a0220.298cc0.047c.GAE@google.com> Subject: Re: [syzbot] [bpf?] KASAN: invalid-access Write in do_bad_area From: syzbot To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, eddyz87@gmail.com, 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 Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: 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=149b5a7c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f49b7d923ce867a dashboard link: https://syzkaller.appspot.com/bug?extid=997752115a851cb0cf36 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=17ee792f980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=163955cd980000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/fa3fbcfdac58/non_bootable_disk-c746c3b5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/85796940f78d/vmlinux-c746c3b5.xz kernel image: https://storage.googleapis.com/syzbot-assets/1d82d6550867/Image-c746c3b5.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+997752115a851cb0cf36@syzkaller.appspotmail.com ================================================================== BUG: KASAN: invalid-access in __memcpy+0xc/0x54 arch/arm64/lib/memcpy.S:250 Write at addr f0ff800083d6d268 by task syz.2.17/3596 Pointer tag: [f0], memory tag: [fe] CPU: 1 UID: 0 PID: 3596 Comm: syz.2.17 Not tainted syzkaller #0 PREEMPT 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 The buggy address belongs to a 1-page vmalloc region starting at 0xf0ff800083d6d000 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:0x544b2 flags: 0x1fffc0000000000(node=0|zone=0|lastcpupid=0x7ff|kasantag=0xf) raw: 01fffc0000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected 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 ================================================================== --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.