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uio: Prevent device destruction while fds are open

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Prevent destruction of a uio_device while user space apps hold open
file descriptors to that device. Further, access to the 'info' member
of the struct uio_device is protected by spinlock. This is to ensure
stale pointers to data not under control of the UIO subsystem are not
dereferenced.

Signed-off-by: Hamish Martin <hamish.martin@alliedtelesis.co.nz>
Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hamish Martin
2018-05-14 13:32:23 +12:00
committed by Greg Kroah-Hartman
parent 81daa406c2
commit a93e7b3315
2 changed files with 75 additions and 27 deletions
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4
include/linux/uio_driver.h
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@@ -14,6 +14,7 @@
#ifndef _UIO_DRIVER_H_
#define _UIO_DRIVER_H_
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
@@ -68,12 +69,13 @@ struct uio_port {
struct uio_device {
struct module *owner;
struct device *dev;
struct device dev;
int minor;
atomic_t event;
struct fasync_struct *async_queue;
wait_queue_head_t wait;
struct uio_info *info;
spinlock_t info_lock;
struct kobject *map_dir;
struct kobject *portio_dir;
};