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Message-ID: <CAEkJfYON+ry7xPx=AiLR9jzUNT+i_Va68ACajOC3HoacOfL1ig@mail.gmail.com> Date: Thu, 11 Apr 2024 14:52:27 +0800 From: Sam Sun <samsun1006219@...il.com> To: linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, Greg KH <gregkh@...uxfoundation.org>, Alan Stern <stern@...land.harvard.edu>, swboyd@...omium.org, ricardo@...liere.net, hkallweit1@...il.com, heikki.krogerus@...ux.intel.com, mathias.nyman@...ux.intel.com, royluo@...gle.com Cc: syzkaller-bugs@...glegroups.com, xrivendell7@...il.com Subject: [Linux kernel bug] general protection fault in disable_store Dear developers and maintainers, We encountered a general protection fault in function disable_store. It is tested against the latest upstream linux (tag 6.9-rc3). C repro and kernel config are attached to this email. Kernel crash log is listed below. ``` general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 9459 Comm: syz-executor414 Not tainted 6.7.0-rc7 #2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 RIP: 0010:disable_store+0xd0/0x3d0 drivers/usb/core/port.c:88 Code: 02 00 00 4c 8b 75 40 4d 8d be 58 ff ff ff 4c 89 ff e8 a4 20 fa ff 48 89 c2 48 89 c5 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 b0 02 00 00 48 8b 45 00 48 8d bb 34 05 00 00 48 RSP: 0018:ffffc90006e3fc08 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff88801d4d4008 RCX: ffffffff86706be8 RDX: 0000000000000000 RSI: ffffffff86706c4d RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff92000dc7f85 R13: ffff88810f4bfb18 R14: ffff88801d4d10a8 R15: ffff88801d4d1000 FS: 00007fa0af71b640(0000) GS:ffff888135c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa0af71a4b8 CR3: 0000000022f5f000 CR4: 0000000000750ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: <TASK> dev_attr_store+0x54/0x80 drivers/base/core.c:2366 sysfs_kf_write+0x114/0x170 fs/sysfs/file.c:136 kernfs_fop_write_iter+0x337/0x500 fs/kernfs/file.c:334 call_write_iter include/linux/fs.h:2020 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x96a/0xd80 fs/read_write.c:584 ksys_write+0x122/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fa0aff9ee1f Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 a9 f4 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 ec f4 02 00 48 RSP: 002b:00007fa0af71a460 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007fa0aff9ee1f RDX: 0000000000000004 RSI: 00007fa0af71acc0 RDI: 0000000000000005 RBP: 0000000000000005 R08: 0000000000000000 R09: 00007fffdb6af2cf R10: 0000000000000000 R11: 0000000000000293 R12: 00007fa0af71acc0 R13: 000000000000006e R14: 00007fa0aff613d0 R15: 00007fa0af6fb000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:disable_store+0xd0/0x3d0 drivers/usb/core/port.c:88 Code: 02 00 00 4c 8b 75 40 4d 8d be 58 ff ff ff 4c 89 ff e8 a4 20 fa ff 48 89 c2 48 89 c5 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 b0 02 00 00 48 8b 45 00 48 8d bb 34 05 00 00 48 RSP: 0018:ffffc90006e3fc08 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff88801d4d4008 RCX: ffffffff86706be8 RDX: 0000000000000000 RSI: ffffffff86706c4d RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff92000dc7f85 R13: ffff88810f4bfb18 R14: ffff88801d4d10a8 R15: ffff88801d4d1000 FS: 00007fa0af71b640(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055d23050c460 CR3: 0000000022f5f000 CR4: 0000000000750ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 ---------------- Code disassembly (best guess): 0: 02 00 add (%rax),%al 2: 00 4c 8b 75 add %cl,0x75(%rbx,%rcx,4) 6: 40 rex 7: 4d 8d be 58 ff ff ff lea -0xa8(%r14),%r15 e: 4c 89 ff mov %r15,%rdi 11: e8 a4 20 fa ff call 0xfffa20ba 16: 48 89 c2 mov %rax,%rdx 19: 48 89 c5 mov %rax,%rbp 1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 23: fc ff df 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 b0 02 00 00 jne 0x2e4 34: 48 8b 45 00 mov 0x0(%rbp),%rax 38: 48 8d bb 34 05 00 00 lea 0x534(%rbx),%rdi 3f: 48 rex.W ``` We analyzed the root cause of this bug. When calling disable_store() in drivers/usb/core/port.c, if function authorized_store() is calling usb_deauthorized_device() concurrently, the usb_interface will be removed by usb_disable_device. However, in function disable_store, usb_hub_to_struct_hub() would try to deref interface, causing nullptr-deref. We also tested other functions in drivers/usb/core/port.c. So far we haven't found a similar problem. If you have any questions, please contact us. Reported by Yue Sun <samsun1006219@...il.com> Reported by xingwei lee <xrivendell7@...il.com> Best Regards, Yue View attachment "disable_store.c" of type "text/x-csrc" (82613 bytes) Download attachment "config" of type "application/octet-stream" (247856 bytes)
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