Messages in this thread | | | Date | Wed, 28 Mar 2007 12:05:48 +0400 | From | Alexey Dobriyan <> | Subject | Re: [PATCH -mm] Fix lseek on /proc/kcore |
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On Thu, Mar 22, 2007 at 02:14:35PM +0100, Arjan van de Ven wrote: > On Thu, 2007-03-22 at 12:56 +0300, Alexey Dobriyan wrote: > > --- a/fs/proc/inode.c > > +++ b/fs/proc/inode.c > > @@ -167,8 +167,9 @@ static loff_t proc_reg_llseek(struct fil > > llseek = pde->proc_fops->llseek; > > spin_unlock(&pde->pde_unload_lock); > > > > - if (llseek) > > - rv = llseek(file, offset, whence); > > + if (!llseek) > > + llseek = default_llseek; > > + rv = llseek(file, offset, whence); > > > > this has potential impact way outside kcore...... > > did you audit all proc users to see if they can deal with lseek?
Mainline deals with lseek on proc entries as follows: * use default_llseek() * but if proc entry set ->llseek via ->proc_fops, use custom llseek
With introduction of proxying, ->llseek was suddenly set on all proc entries, so default_llseek() was never used, but -E started to be returned for all of them that were relying on default_llseek().
So this patch brings proc_reg_llseek() in sync with vfs_llseek().
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