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Commit 3757e381 authored by Pete Zaitcev's avatar Pete Zaitcev Committed by Greg Kroah-Hartman
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usb: mon: Fix a deadlock in usbmon between mmap and read 



commit 19e6317d24c25ee737c65d1ffb7483bdda4bb54a upstream.

The problem arises because our read() function grabs a lock of the
circular buffer, finds something of interest, then invokes copy_to_user()
straight from the buffer, which in turn takes mm->mmap_sem. In the same
time, the callback mon_bin_vma_fault() is invoked under mm->mmap_sem.
It attempts to take the fetch lock and deadlocks.

This patch does away with protecting of our page list with any
semaphores, and instead relies on the kernel not close the device
while mmap is active in a process.

In addition, we prohibit re-sizing of a buffer while mmap is active.
This way, when (now unlocked) fault is processed, it works with the
page that is intended to be mapped-in, and not some other random page.
Note that this may have an ABI impact, but hopefully no legitimate
program is this wrong.

Signed-off-by: default avatarPete Zaitcev <zaitcev@redhat.com>
Reported-by: default avatar <syzbot+56f9673bb4cdcbeb0e92@syzkaller.appspotmail.com>
Reviewed-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Fixes: 46eb14a6 ("USB: fix usbmon BUG trigger")
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20191204203941.3503452b@suzdal.zaitcev.lan


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent cf6a2fbc

drivers/usb/mon/mon_bin.c

+21 −11
Original line number Original line Diff line number Diff line
@@ -1039,12 +1039,18 @@ static long mon_bin_ioctl(struct file *file, unsigned int cmd, unsigned long arg 




		mutex_lock(&rp->fetch_lock);

		mutex_lock(&rp->fetch_lock);

		spin_lock_irqsave(&rp->b_lock, flags);

		spin_lock_irqsave(&rp->b_lock, flags);

		if (rp->mmap_active) {

			mon_free_buff(vec, size/CHUNK_SIZE);

			kfree(vec);

			ret = -EBUSY;

		} else {

			mon_free_buff(rp->b_vec, rp->b_size/CHUNK_SIZE);

			mon_free_buff(rp->b_vec, rp->b_size/CHUNK_SIZE);

			kfree(rp->b_vec);

			kfree(rp->b_vec);

			rp->b_vec  = vec;

			rp->b_vec  = vec;

			rp->b_size = size;

			rp->b_size = size;

			rp->b_read = rp->b_in = rp->b_out = rp->b_cnt = 0;

			rp->b_read = rp->b_in = rp->b_out = rp->b_cnt = 0;

			rp->cnt_lost = 0;

			rp->cnt_lost = 0;

		}

		spin_unlock_irqrestore(&rp->b_lock, flags);

		spin_unlock_irqrestore(&rp->b_lock, flags);

		mutex_unlock(&rp->fetch_lock);

		mutex_unlock(&rp->fetch_lock);

		}

		}
@@ -1216,13 +1222,21 @@ mon_bin_poll(struct file *file, struct poll_table_struct *wait) 
static void mon_bin_vma_open(struct vm_area_struct *vma)

static void mon_bin_vma_open(struct vm_area_struct *vma)

{

{

	struct mon_reader_bin *rp = vma->vm_private_data;

	struct mon_reader_bin *rp = vma->vm_private_data;

	unsigned long flags;



	spin_lock_irqsave(&rp->b_lock, flags);

	rp->mmap_active++;

	rp->mmap_active++;

	spin_unlock_irqrestore(&rp->b_lock, flags);

}

}





static void mon_bin_vma_close(struct vm_area_struct *vma)

static void mon_bin_vma_close(struct vm_area_struct *vma)

{

{

	unsigned long flags;



	struct mon_reader_bin *rp = vma->vm_private_data;

	struct mon_reader_bin *rp = vma->vm_private_data;

	spin_lock_irqsave(&rp->b_lock, flags);

	rp->mmap_active--;

	rp->mmap_active--;

	spin_unlock_irqrestore(&rp->b_lock, flags);

}

}





/*

/*
@@ -1234,16 +1248,12 @@ static vm_fault_t mon_bin_vma_fault(struct vm_fault *vmf) 
	unsigned long offset, chunk_idx;

	unsigned long offset, chunk_idx;

	struct page *pageptr;

	struct page *pageptr;





	mutex_lock(&rp->fetch_lock);

	offset = vmf->pgoff << PAGE_SHIFT;

	offset = vmf->pgoff << PAGE_SHIFT;

	if (offset >= rp->b_size) {

	if (offset >= rp->b_size)

		mutex_unlock(&rp->fetch_lock);

		return VM_FAULT_SIGBUS;

		return VM_FAULT_SIGBUS;

	}

	chunk_idx = offset / CHUNK_SIZE;

	chunk_idx = offset / CHUNK_SIZE;

	pageptr = rp->b_vec[chunk_idx].pg;

	pageptr = rp->b_vec[chunk_idx].pg;

	get_page(pageptr);

	get_page(pageptr);

	mutex_unlock(&rp->fetch_lock);

	vmf->page = pageptr;

	vmf->page = pageptr;

	return 0;

	return 0;

}

}