Le 22/01/2020 à 18:41, Al Viro a écrit :
On Wed, Jan 22, 2020 at 08:13:12AM -0800, Linus Torvalds wrote:
On Wed, Jan 22, 2020 at 5:00 AM Christophe Leroy
wrote:
Modify filldir() and filldir64() to request the real area they need
to get access to.
Not like this.
This makes the situation
On Wed, Jan 22, 2020 at 08:13:12AM -0800, Linus Torvalds wrote:
> On Wed, Jan 22, 2020 at 5:00 AM Christophe Leroy
> wrote:
> >
> > Modify filldir() and filldir64() to request the real area they need
> > to get access to.
>
> Not like this.
>
> This makes the situation for architectures like x86
On Wed, Jan 22, 2020 at 5:00 AM Christophe Leroy
wrote:
>
> Modify filldir() and filldir64() to request the real area they need
> to get access to.
Not like this.
This makes the situation for architectures like x86 much worse, since
you now use "put_user()" for the previous dirent filling. Which
Some architectures grand full access to userspace regardless of the
address/len passed to user_access_begin(), but other architectures
only grand access to the requested area.
For exemple, on 32 bits powerpc (book3s/32), access is granted by
segments of 256 Mbytes.
Modify filldir() and filldir64(
