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List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a5e:8d0b:0:b0:7c7:8e70:39ec with SMTP id m11-20020a5e8d0b000000b007c78e7039ecmr9925ioj.1.1708680557440; Fri, 23 Feb 2024 01:29:17 -0800 (PST) Date: Fri, 23 Feb 2024 01:29:17 -0800 In-Reply-To: <000000000000c848d3060cd1d16a@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000a9373b0612093168@google.com> Subject: Re: [syzbot] [net?] KASAN: slab-use-after-free Read in advance_sched From: syzbot To: davem@davemloft.net, edumazet@google.com, jhs@mojatatu.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com, vinicius.gomes@intel.com, xiyou.wangcong@gmail.com, xrivendell7@gmail.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 9abbc24128bc Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=14334f1a180000 kernel config: https://syzkaller.appspot.com/x/.config?x=af5c6c699e57bbb3 dashboard link: https://syzkaller.appspot.com/bug?extid=b65e0af58423fc8a73aa compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16d85b34180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10a70158180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ce13ec3ed5ad/disk-9abbc241.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/256cbd314121/vmlinux-9abbc241.xz kernel image: https://storage.googleapis.com/syzbot-assets/0af86fb52109/Image-9abbc241.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b65e0af58423fc8a73aa@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in advance_sched+0xa70/0xac0 net/sched/sch_taprio.c:953 Read of size 8 at addr ffff0000d31b4110 by task syz-executor440/31519 CPU: 0 PID: 31519 Comm: syz-executor440 Tainted: G B 6.8.0-rc5-syzkaller-g9abbc24128bc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x178/0x518 mm/kasan/report.c:488 kasan_report+0xd8/0x138 mm/kasan/report.c:601 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 advance_sched+0xa70/0xac0 net/sched/sch_taprio.c:953 __run_hrtimer kernel/time/hrtimer.c:1689 [inline] __hrtimer_run_queues+0x484/0xca0 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x4e0/0xb64 kernel/time/hrtimer.c:1815 timer_handler drivers/clocksource/arm_arch_timer.c:674 [inline] arch_timer_handler_virt+0x74/0x88 drivers/clocksource/arm_arch_timer.c:685 handle_percpu_devid_irq+0x2a4/0x804 kernel/irq/chip.c:942 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline] handle_irq_desc kernel/irq/irqdesc.c:672 [inline] generic_handle_domain_irq+0x7c/0xc4 kernel/irq/irqdesc.c:728 __gic_handle_irq drivers/irqchip/irq-gic-v3.c:782 [inline] __gic_handle_irq_from_irqson drivers/irqchip/irq-gic-v3.c:833 [inline] gic_handle_irq+0x6c/0x190 drivers/irqchip/irq-gic-v3.c:877 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:889 do_interrupt_handler+0xd4/0x138 arch/arm64/kernel/entry-common.c:310 __el1_irq arch/arm64/kernel/entry-common.c:536 [inline] el1_interrupt+0x34/0x68 arch/arm64/kernel/entry-common.c:551 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:556 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:594 __ext4_new_inode+0xc40/0x39a0 fs/ext4/ialloc.c:1030 ext4_symlink+0x328/0x9bc fs/ext4/namei.c:3396 vfs_symlink+0x138/0x260 fs/namei.c:4480 do_symlinkat+0x1bc/0x45c fs/namei.c:4506 __do_sys_symlinkat fs/namei.c:4522 [inline] __se_sys_symlinkat fs/namei.c:4519 [inline] __arm64_sys_symlinkat+0xa4/0xbc fs/namei.c:4519 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Allocated by task 31501: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x70/0x84 mm/kasan/generic.c:626 poison_kmalloc_redzone mm/kasan/common.c:372 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x26c/0x49c mm/slub.c:4012 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] taprio_change+0xd14/0x3bf0 net/sched/sch_taprio.c:1881 qdisc_change net/sched/sch_api.c:1416 [inline] tc_modify_qdisc+0x1474/0x1870 net/sched/sch_api.c:1746 rtnetlink_rcv_msg+0x748/0xdbc net/core/rtnetlink.c:6618 netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2543 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6636 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1367 netlink_sendmsg+0x83c/0xb20 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x56c/0x840 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x26c/0x33c net/socket.c:2667 __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg net/socket.c:2674 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2674 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Freed by task 16: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x5c/0x74 mm/kasan/generic.c:640 poison_slab_object+0x124/0x18c mm/kasan/common.c:241 __kasan_slab_free+0x3c/0x78 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x144/0x3cc mm/slub.c:4409 taprio_free_sched_cb+0x158/0x178 net/sched/sch_taprio.c:199 rcu_do_batch kernel/rcu/tree.c:2190 [inline] rcu_core+0x890/0x1b34 kernel/rcu/tree.c:2465 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2482 __do_softirq+0x2d8/0xce4 kernel/softirq.c:553 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:47 __kasan_record_aux_stack+0xc4/0x110 mm/kasan/generic.c:586 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:612 __call_rcu_common kernel/rcu/tree.c:2715 [inline] call_rcu+0x104/0xaf4 kernel/rcu/tree.c:2829 taprio_change+0x3288/0x3bf0 net/sched/sch_taprio.c:1991 qdisc_change net/sched/sch_api.c:1416 [inline] tc_modify_qdisc+0x1474/0x1870 net/sched/sch_api.c:1746 rtnetlink_rcv_msg+0x748/0xdbc net/core/rtnetlink.c:6618 netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2543 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6636 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1367 netlink_sendmsg+0x83c/0xb20 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x56c/0x840 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x26c/0x33c net/socket.c:2667 __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg net/socket.c:2674 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2674 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 The buggy address belongs to the object at ffff0000d31b4000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 272 bytes inside of freed 512-byte region [ffff0000d31b4000, ffff0000d31b4200) The buggy address belongs to the physical page: page:000000004df8a1f0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1131b4 head:000000004df8a1f0 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0x5ffc00000000840(slab|head|node=0|zone=2|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 05ffc00000000840 ffff0000c0001c80 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d31b4000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d31b4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000d31b4100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d31b4180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d31b4200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git 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