Re: [patch-2.4.0-test5-pre1] nullfs and forced umount
Jan Harkes (jaharkes@cs.cmu.edu)
Tue, 18 Jul 2000 16:59:01 -0400
On Tue, Jul 18, 2000 at 07:51:24PM +0200, Manfred Spraul wrote:
> Tigran Aivazian wrote:
> > +
> > + /* flush and release fs-specific resources */
> > + if (fop->flush)
> > + fop->flush(file);
> > + if (fop->release)
> > + fop->release(inode, file);
>
> This one could cause crashes if another thread is within kernel space.
> E.g. coda frees allocated memory in coda_release.
Our userspace code only looks at the fsuid in the cred structure. We can
therefore avoid freeing the credentials in coda_release by using
f->f_uid/f_gid to partially reconstruct the credentials of the original
opener.
However, this might also affect other filesystems at some point.
Jan
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