From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C6021C433F5 for ; Sat, 14 May 2022 07:35:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229490AbiENHfZ (ORCPT ); Sat, 14 May 2022 03:35:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39828 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229437AbiENHfX (ORCPT ); Sat, 14 May 2022 03:35:23 -0400 Received: from mail-io1-f72.google.com (mail-io1-f72.google.com [209.85.166.72]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A76D220E for ; Sat, 14 May 2022 00:35:20 -0700 (PDT) Received: by mail-io1-f72.google.com with SMTP id n5-20020a056602340500b0065a9f426e7aso6312482ioz.0 for ; Sat, 14 May 2022 00:35:20 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=ZxEs3HMnmKvqIZL34xAsWfWg2TolICgmPzbL68K0Ecc=; b=prBmxRdIVUhz6SKYGkqyuFsdjTGpdRt/mOZ/N1uFYOG92Q3PIDHCw/OFcNZMv6/9yq zhUO6dSfughiYM8mSglIqloS2SuzjH627qpuixQXyGGnZizyg0JVPcSG/T5WSKSD1wZ2 qxdDGSkmk15XPVOA5lw1mNOVKPJHXcMFsj5/iyJxP1ScqoEclCIKABepDR92+dfzr1Kp qXBXzLdjmZGGYOHsold3YyIxpkPhtZWmS66zpWAYYzXNUBVNzCn0Bly74k5txvgY6P8B BUkMAnf0Jyatw96O0+pp7gE0WDLSn0TmftLPLPoSvotmZGQpUS+FUImecrQaUDHDCEcx gXig== X-Gm-Message-State: AOAM531y+feKm1PeGak4jdIzdJPXXj43dhzpvoPE/2VoD0x6D0nQPT8W OlwkEQsI1Xl/jeA3wZmlmqf3txeGGSfItejFBxOIR6EbqEty X-Google-Smtp-Source: ABdhPJyMppWPzAMw129yotfB2Q/JGzMJAuBzqSqtAR5JELwzFrB5+YrUivU/mJSUPy4WQFW3TBiYIII4K+ka/8/K8aArCWmjwEhM MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1c87:b0:2cf:2d3d:dd89 with SMTP id w7-20020a056e021c8700b002cf2d3ddd89mr4609906ill.36.1652513720034; Sat, 14 May 2022 00:35:20 -0700 (PDT) Date: Sat, 14 May 2022 00:35:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000044eb3305def3d567@google.com> Subject: [syzbot] KASAN: use-after-free Read in slip_open (2) From: syzbot To: arnd@arndb.de, davem@davemloft.net, dmitry.torokhov@gmail.com, edumazet@google.com, gregkh@linuxfoundation.org, jirislaby@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, mkl@pengutronix.de, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 9be9ed2612b5 Merge tag 'platform-drivers-x86-v5.18-4' of g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=122c18c6f00000 kernel config: https://syzkaller.appspot.com/x/.config?x=79caa0035f59d385 dashboard link: https://syzkaller.appspot.com/bug?extid=9d130534f0d300732a3a compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9d130534f0d300732a3a@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in sl_sync drivers/net/slip/slip.c:730 [inline] BUG: KASAN: use-after-free in slip_open+0xec3/0x11b0 drivers/net/slip/slip.c:806 Read of size 1 at addr ffff888056ca8df1 by task syz-executor.1/3054 CPU: 1 PID: 3054 Comm: syz-executor.1 Not tainted 5.18.0-rc6-syzkaller-00007-g9be9ed2612b5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 sl_sync drivers/net/slip/slip.c:730 [inline] slip_open+0xec3/0x11b0 drivers/net/slip/slip.c:806 tty_ldisc_open+0x9b/0x110 drivers/tty/tty_ldisc.c:433 tty_set_ldisc+0x2f1/0x680 drivers/tty/tty_ldisc.c:558 tiocsetd drivers/tty/tty_io.c:2433 [inline] tty_ioctl+0xae0/0x15e0 drivers/tty/tty_io.c:2714 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f45150890e9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f451621a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f451519bf60 RCX: 00007f45150890e9 RDX: 0000000020000040 RSI: 0000000000005423 RDI: 0000000000000003 RBP: 00007f45150e308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe5344efcf R14: 00007f451621a300 R15: 0000000000022000 Allocated by task 3043: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc_node include/linux/slab.h:604 [inline] kvmalloc_node+0x3e/0x190 mm/util.c:580 kvmalloc include/linux/slab.h:731 [inline] kvzalloc include/linux/slab.h:739 [inline] alloc_netdev_mqs+0x98/0x1100 net/core/dev.c:10491 sl_alloc drivers/net/slip/slip.c:756 [inline] slip_open+0x36d/0x11b0 drivers/net/slip/slip.c:817 tty_ldisc_open+0x9b/0x110 drivers/tty/tty_ldisc.c:433 tty_set_ldisc+0x2f1/0x680 drivers/tty/tty_ldisc.c:558 tiocsetd drivers/tty/tty_io.c:2433 [inline] tty_ioctl+0xae0/0x15e0 drivers/tty/tty_io.c:2714 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 3034: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754 slab_free mm/slub.c:3510 [inline] kfree+0xd6/0x4d0 mm/slub.c:4552 kvfree+0x42/0x50 mm/util.c:622 device_release+0x9f/0x240 drivers/base/core.c:2229 kobject_cleanup lib/kobject.c:673 [inline] kobject_release lib/kobject.c:704 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:721 netdev_run_todo+0x72e/0x10b0 net/core/dev.c:10274 slip_close+0x161/0x1c0 drivers/net/slip/slip.c:906 tty_ldisc_close+0x110/0x190 drivers/tty/tty_ldisc.c:456 tty_ldisc_kill+0x94/0x150 drivers/tty/tty_ldisc.c:608 tty_ldisc_release+0xe1/0x2a0 drivers/tty/tty_ldisc.c:776 tty_release_struct+0x20/0xe0 drivers/tty/tty_io.c:1694 tty_release+0xc70/0x1200 drivers/tty/tty_io.c:1865 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff888056ca8000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 3569 bytes inside of 4096-byte region [ffff888056ca8000, ffff888056ca9000) The buggy address belongs to the physical page: page:ffffea00015b2a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x56ca8 head:ffffea00015b2a00 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff88801f47db01 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888010c4c280 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88801f47db01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 3884, tgid 3884 (udevd), ts 529533667679, free_ts 529460891996 prep_new_page mm/page_alloc.c:2441 [inline] get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4182 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5408 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2272 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x8df/0xf20 mm/slub.c:3005 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3092 slab_alloc_node mm/slub.c:3183 [inline] __kmalloc_node+0x2cb/0x390 mm/slub.c:4458 kmalloc_node include/linux/slab.h:604 [inline] kvmalloc_node+0x3e/0x190 mm/util.c:580 kvmalloc include/linux/slab.h:731 [inline] seq_buf_alloc fs/seq_file.c:38 [inline] seq_read_iter+0x7f7/0x1280 fs/seq_file.c:210 proc_reg_read_iter+0x1fb/0x2d0 fs/proc/inode.c:300 call_read_iter include/linux/fs.h:2044 [inline] new_sync_read+0x384/0x5f0 fs/read_write.c:401 vfs_read+0x492/0x5d0 fs/read_write.c:482 ksys_read+0x127/0x250 fs/read_write.c:620 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1356 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1406 free_unref_page_prepare mm/page_alloc.c:3328 [inline] free_unref_page+0x19/0x6a0 mm/page_alloc.c:3423 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2523 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:749 [inline] slab_alloc_node mm/slub.c:3217 [inline] slab_alloc mm/slub.c:3225 [inline] __kmem_cache_alloc_lru mm/slub.c:3232 [inline] kmem_cache_alloc_lru+0x255/0x720 mm/slub.c:3249 alloc_inode_sb include/linux/fs.h:2966 [inline] shmem_alloc_inode+0x23/0x50 mm/shmem.c:3722 alloc_inode+0x61/0x230 fs/inode.c:260 new_inode_pseudo fs/inode.c:1018 [inline] new_inode+0x27/0x2f0 fs/inode.c:1047 shmem_get_inode+0x195/0xcd0 mm/shmem.c:2261 shmem_mknod+0x5a/0x1f0 mm/shmem.c:2823 lookup_open.isra.0+0x10cc/0x1690 fs/namei.c:3330 open_last_lookups fs/namei.c:3400 [inline] path_openat+0x9a2/0x2910 fs/namei.c:3606 do_filp_open+0x1aa/0x400 fs/namei.c:3636 do_sys_openat2+0x16d/0x4c0 fs/open.c:1213 Memory state around the buggy address: ffff888056ca8c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888056ca8d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888056ca8d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888056ca8e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888056ca8e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This report is generated by a bot. 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