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Sat, 27 Jun 2020 19:47:14 -0700 (PDT) Date: Sat, 27 Jun 2020 19:47:14 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000b1b74105a91bf53d@google.com> Subject: KASAN: use-after-free Read in macvlan_dev_get_iflink From: syzbot To: davem@davemloft.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 1590a2e1 Merge tag 'acpi-5.8-rc3' of git://git.kernel.org/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1070059b100000 kernel config: https://syzkaller.appspot.com/x/.config?x=20c907630cbdbe5 dashboard link: https://syzkaller.appspot.com/bug?extid=95eec132c4bd9b1d8430 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1559e6e5100000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16aadd29100000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+95eec132c4bd9b1d8430@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in macvlan_dev_get_iflink+0x6a/0x70 drivers/net/macvlan.c:1137 Read of size 4 at addr ffff88808b62a100 by task syz-executor984/7033 CPU: 0 PID: 7033 Comm: syz-executor984 Not tainted 5.8.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1f0/0x31e lib/dump_stack.c:118 print_address_description+0x66/0x5a0 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report+0x132/0x1d0 mm/kasan/report.c:530 macvlan_dev_get_iflink+0x6a/0x70 drivers/net/macvlan.c:1137 default_operstate net/core/link_watch.c:41 [inline] rfc2863_policy+0x11f/0x2a0 net/core/link_watch.c:53 linkwatch_do_dev+0x3a/0x160 net/core/link_watch.c:160 netdev_wait_allrefs net/core/dev.c:9678 [inline] netdev_run_todo+0x2c8/0xc90 net/core/dev.c:9774 rtnl_unlock net/core/rtnetlink.c:112 [inline] rtnetlink_rcv_msg+0x890/0xd40 net/core/rtnetlink.c:5461 netlink_rcv_skb+0x190/0x3a0 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x786/0x940 net/netlink/af_netlink.c:1329 netlink_sendmsg+0xa57/0xd70 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x519/0x800 net/socket.c:2352 ___sys_sendmsg net/socket.c:2406 [inline] __sys_sendmsg+0x2b1/0x360 net/socket.c:2439 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x446e69 Code: Bad RIP value. RSP: 002b:00007f7fa3a46d98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000006dbc98 RCX: 0000000000446e69 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000006 RBP: 00000000006dbc90 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000000a R11: 0000000000000246 R12: 00000000006dbc9c R13: 0000000000000000 R14: 0000000000000000 R15: 0705001000000048 Allocated by task 7001: save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494 kmalloc_node include/linux/slab.h:578 [inline] kvmalloc_node+0x81/0x110 mm/util.c:574 kvmalloc include/linux/mm.h:753 [inline] kvzalloc include/linux/mm.h:761 [inline] alloc_netdev_mqs+0x86/0xf90 net/core/dev.c:9938 rtnl_create_link+0x242/0x9c0 net/core/rtnetlink.c:3067 __rtnl_newlink net/core/rtnetlink.c:3329 [inline] rtnl_newlink+0x12a2/0x1bf0 net/core/rtnetlink.c:3397 rtnetlink_rcv_msg+0x889/0xd40 net/core/rtnetlink.c:5460 netlink_rcv_skb+0x190/0x3a0 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x786/0x940 net/netlink/af_netlink.c:1329 netlink_sendmsg+0xa57/0xd70 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x519/0x800 net/socket.c:2352 ___sys_sendmsg net/socket.c:2406 [inline] __sys_sendmsg+0x2b1/0x360 net/socket.c:2439 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 7001: save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x220 mm/slab.c:3757 device_release+0x70/0x1a0 drivers/base/core.c:1555 kobject_cleanup lib/kobject.c:693 [inline] kobject_release lib/kobject.c:722 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x15b/0x220 lib/kobject.c:739 netdev_run_todo+0xb17/0xc90 net/core/dev.c:9797 rtnl_unlock net/core/rtnetlink.c:112 [inline] rtnetlink_rcv_msg+0x890/0xd40 net/core/rtnetlink.c:5461 netlink_rcv_skb+0x190/0x3a0 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x786/0x940 net/netlink/af_netlink.c:1329 netlink_sendmsg+0xa57/0xd70 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x519/0x800 net/socket.c:2352 ___sys_sendmsg net/socket.c:2406 [inline] __sys_sendmsg+0x2b1/0x360 net/socket.c:2439 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88808b62a000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 256 bytes inside of 4096-byte region [ffff88808b62a000, ffff88808b62b000) The buggy address belongs to the page: page:ffffea00022d8a80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea00022d8a80 order:1 compound_mapcount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea0002a12288 ffffea0002462c08 ffff8880aa402000 raw: 0000000000000000 ffff88808b62a000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808b62a000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808b62a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808b62a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808b62a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808b62a200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches