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Message-ID: <CA+fCnZdMpNFzDg-+cu0Dx_hCfh=vkRH_aFKALWZmA5O_J9pPKQ@mail.gmail.com> Date: Sat, 21 Sep 2024 23:01:56 +0200 From: Andrey Konovalov <andreyknvl@...il.com> To: syzbot <syzbot+1412b4c05666882f1a0d@...kaller.appspotmail.com> Cc: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [usb?] KASAN: slab-use-after-free Read in raw_process_ep_io On Mon, Sep 16, 2024 at 11:10 PM syzbot <syzbot+1412b4c05666882f1a0d@...kaller.appspotmail.com> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 20371ba12063 Merge tag 'drm-fixes-2024-08-30' of https://g.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=17be4453980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=c33ac4f18fd4c6c7 > dashboard link: https://syzkaller.appspot.com/bug?extid=1412b4c05666882f1a0d > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > userspace arch: i386 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-20371ba1.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/6c05996bb727/vmlinux-20371ba1.xz > kernel image: https://storage.googleapis.com/syzbot-assets/88ec4a9fc0cc/bzImage-20371ba1.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+1412b4c05666882f1a0d@...kaller.appspotmail.com > > usblp0: error -71 reading from printer > ================================================================== > BUG: KASAN: slab-use-after-free in usb_endpoint_dir_in include/uapi/linux/usb/ch9.h:494 [inline] > BUG: KASAN: slab-use-after-free in raw_process_ep_io+0x848/0xb90 drivers/usb/gadget/legacy/raw_gadget.c:1098 > Read of size 1 at addr ffff8880125e09e2 by task syz.3.365/6589 > > CPU: 2 UID: 0 PID: 6589 Comm: syz.3.365 Not tainted 6.11.0-rc5-syzkaller-00176-g20371ba12063 #0 > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 > Call Trace: > <TASK> > __dump_stack lib/dump_stack.c:93 [inline] > dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119 > print_address_description mm/kasan/report.c:377 [inline] > print_report+0xc3/0x620 mm/kasan/report.c:488 > kasan_report+0xd9/0x110 mm/kasan/report.c:601 > usb_endpoint_dir_in include/uapi/linux/usb/ch9.h:494 [inline] > raw_process_ep_io+0x848/0xb90 drivers/usb/gadget/legacy/raw_gadget.c:1098 > raw_ioctl_ep_write drivers/usb/gadget/legacy/raw_gadget.c:1152 [inline] > raw_ioctl+0xc9c/0x2a50 drivers/usb/gadget/legacy/raw_gadget.c:1324 > __do_compat_sys_ioctl+0x2c3/0x330 fs/ioctl.c:1007 > do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] > __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 > do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 > entry_SYSENTER_compat_after_hwframe+0x84/0x8e > RIP: 0023:0xf7f68579 > Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 > RSP: 002b:00000000f5705514 EFLAGS: 00000292 ORIG_RAX: 0000000000000036 > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000040085507 > RDX: 00000000f5705558 RSI: 00000000f73f0ff4 RDI: 00000000f57055e4 > RBP: 00000000f5706578 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > </TASK> > > Allocated by task 6592: > kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 > kasan_save_track+0x14/0x30 mm/kasan/common.c:68 > poison_kmalloc_redzone mm/kasan/common.c:370 [inline] > __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 > kasan_kmalloc include/linux/kasan.h:211 [inline] > __do_kmalloc_node mm/slub.c:4158 [inline] > __kmalloc_node_track_caller_noprof+0x20f/0x440 mm/slub.c:4177 > memdup_user+0x2a/0xd0 mm/util.c:226 > raw_ioctl_ep_enable drivers/usb/gadget/legacy/raw_gadget.c:847 [inline] > raw_ioctl+0x105d/0x2a50 drivers/usb/gadget/legacy/raw_gadget.c:1318 > __do_compat_sys_ioctl+0x2c3/0x330 fs/ioctl.c:1007 > do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] > __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 > do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 > entry_SYSENTER_compat_after_hwframe+0x84/0x8e > > Freed by task 6589: > kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 > kasan_save_track+0x14/0x30 mm/kasan/common.c:68 > kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 > poison_slab_object+0xf7/0x160 mm/kasan/common.c:240 > __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256 > kasan_slab_free include/linux/kasan.h:184 [inline] > slab_free_hook mm/slub.c:2252 [inline] > slab_free mm/slub.c:4473 [inline] > kfree+0x12a/0x3b0 mm/slub.c:4594 > dev_free+0x446/0x700 drivers/usb/gadget/legacy/raw_gadget.c:225 > kref_put include/linux/kref.h:65 [inline] > raw_release+0x16e/0x2c0 drivers/usb/gadget/legacy/raw_gadget.c:473 > __fput+0x408/0xbb0 fs/file_table.c:422 > __fput_sync+0x47/0x50 fs/file_table.c:507 > __do_sys_close fs/open.c:1566 [inline] > __se_sys_close fs/open.c:1551 [inline] > __ia32_sys_close+0x86/0x100 fs/open.c:1551 > do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] > __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 > do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 > entry_SYSENTER_compat_after_hwframe+0x84/0x8e > > The buggy address belongs to the object at ffff8880125e09e0 > which belongs to the cache kmalloc-16 of size 16 > The buggy address is located 2 bytes inside of > freed 16-byte region [ffff8880125e09e0, ffff8880125e09f0) > > The buggy address belongs to the physical page: > page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880125e0ce0 pfn:0x125e0 > flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff) > page_type: 0xfdffffff(slab) > raw: 00fff00000000200 ffff88801ac42640 ffffea00008a5b10 ffff88801ac40408 > raw: ffff8880125e0ce0 0000000000800076 00000001fdffffff 0000000000000000 > page dumped because: kasan: bad access detected > page_owner tracks the page as allocated > page last allocated via order 0, migratetype Unmovable, gfp_mask 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 5359, tgid 5359 (syz-executor), ts 61887753741, free_ts 58155057252 > set_page_owner include/linux/page_owner.h:32 [inline] > post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1493 > prep_new_page mm/page_alloc.c:1501 [inline] > get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3439 > __alloc_pages_slowpath mm/page_alloc.c:4228 [inline] > __alloc_pages_noprof+0x6ad/0x2460 mm/page_alloc.c:4708 > __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] > alloc_pages_node_noprof include/linux/gfp.h:296 [inline] > alloc_slab_page+0x4e/0xf0 mm/slub.c:2321 > allocate_slab mm/slub.c:2484 [inline] > new_slab+0x84/0x260 mm/slub.c:2537 > ___slab_alloc+0xdac/0x1870 mm/slub.c:3723 > __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3813 > __slab_alloc_node mm/slub.c:3866 [inline] > slab_alloc_node mm/slub.c:4025 [inline] > __do_kmalloc_node mm/slub.c:4157 [inline] > __kmalloc_node_noprof+0x367/0x440 mm/slub.c:4164 > __kvmalloc_node_noprof+0x9d/0x1a0 mm/util.c:650 > xt_jumpstack_alloc net/netfilter/x_tables.c:1355 [inline] > xt_replace_table+0x1c7/0x910 net/netfilter/x_tables.c:1394 > __do_replace+0x1d9/0x9c0 net/ipv4/netfilter/arp_tables.c:912 > compat_do_replace+0x3ca/0x500 net/ipv4/netfilter/ip_tables.c:1529 > do_ip6t_set_ctl+0x686/0xc20 net/ipv6/netfilter/ip6_tables.c:1641 > nf_setsockopt+0x8a/0xf0 net/netfilter/nf_sockopt.c:101 > ipv6_setsockopt+0x133/0x1a0 net/ipv6/ipv6_sockglue.c:998 > tcp_setsockopt+0xa4/0x100 net/ipv4/tcp.c:3768 > page last free pid 5359 tgid 5359 stack trace: > reset_page_owner include/linux/page_owner.h:25 [inline] > free_pages_prepare mm/page_alloc.c:1094 [inline] > free_unref_page+0x64a/0xe40 mm/page_alloc.c:2612 > qlink_free mm/kasan/quarantine.c:163 [inline] > qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179 > kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 > __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322 > kasan_slab_alloc include/linux/kasan.h:201 [inline] > slab_post_alloc_hook mm/slub.c:3988 [inline] > slab_alloc_node mm/slub.c:4037 [inline] > __kmalloc_cache_noprof+0x11e/0x310 mm/slub.c:4184 > kmalloc_noprof include/linux/slab.h:681 [inline] > kzalloc_noprof include/linux/slab.h:807 [inline] > kset_create lib/kobject.c:965 [inline] > kset_create_and_add+0x4d/0x190 lib/kobject.c:1008 > register_queue_kobjects net/core/net-sysfs.c:1887 [inline] > netdev_register_kobject+0x1cd/0x3f0 net/core/net-sysfs.c:2140 > register_netdevice+0x1473/0x1e20 net/core/dev.c:10444 > veth_newlink+0x4fb/0x9e0 drivers/net/veth.c:1860 > rtnl_newlink_create net/core/rtnetlink.c:3510 [inline] > __rtnl_newlink+0x119c/0x1920 net/core/rtnetlink.c:3730 > rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3743 > rtnetlink_rcv_msg+0x3c7/0xea0 net/core/rtnetlink.c:6647 > netlink_rcv_skb+0x165/0x410 net/netlink/af_netlink.c:2550 > netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] > netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1357 > netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1901 > sock_sendmsg_nosec net/socket.c:730 [inline] > __sock_sendmsg net/socket.c:745 [inline] > __sys_sendto+0x47f/0x4e0 net/socket.c:2204 > > Memory state around the buggy address: > ffff8880125e0880: 00 00 fc fc 00 00 fc fc 00 00 fc fc 00 00 fc fc > ffff8880125e0900: 00 00 fc fc fa fb fc fc 00 00 fc fc 00 03 fc fc > >ffff8880125e0980: 00 01 fc fc 00 00 fc fc 00 03 fc fc fa fb fc fc > ^ > ffff8880125e0a00: 00 03 fc fc 00 00 fc fc 00 04 fc fc 00 00 fc fc > ffff8880125e0a80: 00 00 fc fc 00 04 fc fc 00 00 fc fc 00 00 fc fc > ================================================================== > ---------------- > Code disassembly (best guess), 2 bytes skipped: > 0: 10 06 adc %al,(%rsi) > 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi > 6: 10 07 adc %al,(%rdi) > 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi > c: 10 08 adc %cl,(%rax) > e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi > 1e: 00 51 52 add %dl,0x52(%rcx) > 21: 55 push %rbp > 22: 89 e5 mov %esp,%ebp > 24: 0f 34 sysenter > 26: cd 80 int $0x80 > * 28: 5d pop %rbp <-- trapping instruction > 29: 5a pop %rdx > 2a: 59 pop %rcx > 2b: c3 ret > 2c: 90 nop > 2d: 90 nop > 2e: 90 nop > 2f: 90 nop > 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi > 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi > > > --- > This report 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@...glegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want to overwrite report's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup #syz dup: KASAN: invalid-free in dev_free
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