lkml.org 
[lkml]   [1998]   [Jan]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Sound driver security hole?
On Fri, 30 Jan 1998, Itai Nahshon wrote:

> Tom, I tried it and I would say it is not just a bug in the
> sound driver. Device close should be called only for the *last*
> close on the device. If a device or file is memory mapped
> it should still be open internally.

> IMHO this is a bug which is *not* related to the sound driver.

Not quite - you have to remember that mmap() is an operation applying to
the inode pointed to by the file descriptor, hence its existance well
after the fd is closed. If a device driver needs to hold onto resources
for the duration of an mmap()ing, then it should lock/unlock by providing
its own open and close functions in the vm_ops for the vma. Changing the
sound driver to obey the semantics of the mm layer might be a bit of a
pain, but it's the Right Thing(tm) to do.

-ben


\
 
 \ /
  Last update: 2005-03-22 13:41    [W:0.057 / U:0.056 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site