/proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:23192 pid: 8700 ppid: 8455 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0xc07/0x11f0 kernel/sched/core.c:5938 schedule+0x14b/0x210 kernel/sched/core.c:6017 schedule_timeout+0x98/0x2f0 kernel/time/timer.c:1857 do_wait_for_common+0x2da/0x480 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion_timeout+0x46/0x60 kernel/sched/completion.c:157 usb_start_wait_urb+0x167/0x550 drivers/usb/core/message.c:63 do_proc_bulk+0x978/0x1080 drivers/usb/core/devio.c:1236 proc_bulk drivers/usb/core/devio.c:1273 [inline] usbdev_do_ioctl drivers/usb/core/devio.c:2547 [inline] usbdev_ioctl+0x3441/0x6b10 drivers/usb/core/devio.c:2713 ... To fix this problem, this patch replaces usbfs's calls to usb_control_msg() and usb_bulk_msg() with special-purpose code that does essentially the same thing (as recommended in the comment for usb_start_wait_urb()), except that it always uses a killable wait and it uses GFP_KERNEL rather than GFP_NOIO. "> /proc/sys/kernel/hung_task_timeout_secs",disables,this,message. task:syz-executor.0,state:D,stack:23192,pid:,8700,ppid:,8455 flags:0x00004004,Call,Trace:,context_switch,kernel/sched/core.c:4681 [inline],__schedule+0xc07/0x11f0,kernel/sched/core.c:5938 schedule+0x14b/0x210,kernel/sched/core.c:6017 schedule_timeout+0x98/0x2f0,kernel/time/timer.c:1857 do_wait_for_common+0x2da/0x480,kernel/sched/completion.c:85 __wait_for_common,kernel/sched/completion.c:106,[inline] wait_for_common,kernel/sched/completion.c:117,[inline] wait_for_completion_timeout+0x46/0x60,kernel/sched/completion.c:157 usb_start_wait_urb+0x167/0x550,drivers/usb/core/message.c:63 do_proc_bulk+0x978/0x1080,drivers/usb/core/devio.c:1236,proc_bulk drivers/usb/core/devio.c:1273,[inline],usbdev_do_ioctl drivers/usb/core/devio.c:2547,[inline],usbdev_ioctl+0x3441/0x6b10 drivers/usb/core/devio.c:2713,...,To,fix,this,problem,,this,patch replaces,usbfs's,calls,to,usb_control_msg(),and,usb_bulk_msg(),with special-purpose,code,that,does,essentially,the,same,thing,(as recommended,in,the,comment,for,usb_start_wait_urb()),,except,that,it always,uses,a,killable,wait,and,it,uses,GFP_KERNEL,rather,than GFP_NOIO. "> SecuritySpace - CVE-2021-47582
 
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CVE ID:CVE-2021-47582
Description:In the Linux kernel, the following vulnerability has been resolved: USB: core: Make do_proc_control() and do_proc_bulk() killable The USBDEVFS_CONTROL and USBDEVFS_BULK ioctls invoke usb_start_wait_urb(), which contains an uninterruptible wait with a user-specified timeout value. If timeout value is very large and the device being accessed does not respond in a reasonable amount of time, the kernel will complain about "Task X blocked for more than N seconds", as found in testing by syzbot: INFO: task syz-executor.0:8700 blocked for more than 143 seconds. Not tainted 5.14.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:23192 pid: 8700 ppid: 8455 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0xc07/0x11f0 kernel/sched/core.c:5938 schedule+0x14b/0x210 kernel/sched/core.c:6017 schedule_timeout+0x98/0x2f0 kernel/time/timer.c:1857 do_wait_for_common+0x2da/0x480 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion_timeout+0x46/0x60 kernel/sched/completion.c:157 usb_start_wait_urb+0x167/0x550 drivers/usb/core/message.c:63 do_proc_bulk+0x978/0x1080 drivers/usb/core/devio.c:1236 proc_bulk drivers/usb/core/devio.c:1273 [inline] usbdev_do_ioctl drivers/usb/core/devio.c:2547 [inline] usbdev_ioctl+0x3441/0x6b10 drivers/usb/core/devio.c:2713 ... To fix this problem, this patch replaces usbfs's calls to usb_control_msg() and usb_bulk_msg() with special-purpose code that does essentially the same thing (as recommended in the comment for usb_start_wait_urb()), except that it always uses a killable wait and it uses GFP_KERNEL rather than GFP_NOIO.
Test IDs: None available
Cross References: Common Vulnerability Exposure (CVE) ID: CVE-2021-47582
https://git.kernel.org/stable/c/403716741c6c2c510dce44e88f085a740f535de6
https://git.kernel.org/stable/c/403716741c6c2c510dce44e88f085a740f535de6
https://git.kernel.org/stable/c/ae8709b296d80c7f45aa1f35c0e7659ad69edce1
https://git.kernel.org/stable/c/ae8709b296d80c7f45aa1f35c0e7659ad69edce1



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