Christoph Hellwig writes:
>> +static int count_strings_kernel(const char *const *argv)
>> +{
>> +int i;
>> +
>> +if (!argv)
>> +return 0;
>> +
>> +for (i = 0; argv[i]; ++i) {
>> +if (i >= MAX_ARG_STRINGS)
>> +return -E2BIG;
>> +i
On Wed, Jul 15, 2020 at 08:00:16AM -0700, Kees Cook wrote:
> Heh, yes please. :) (Which branch is this from?
http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/exec-cleanup
> Are yours and Eric's
> tree going to collide?)
Yes, badly.
From: Kees Cook
> Sent: 15 July 2020 16:09
>
> On Wed, Jul 15, 2020 at 02:55:50PM +, David Laight wrote:
> > From: Christoph Hellwig
> > > Sent: 15 July 2020 07:43
> > > Subject: Re: [PATCH 7/7] exec: Implement kernel_execve
> > >
> > >
On Wed, Jul 15, 2020 at 02:55:50PM +, David Laight wrote:
> From: Christoph Hellwig
> > Sent: 15 July 2020 07:43
> > Subject: Re: [PATCH 7/7] exec: Implement kernel_execve
> >
> > On Tue, Jul 14, 2020 at 02:49:23PM -0700, Kees Cook wrote:
> > > On Tue, Jul
On Wed, Jul 15, 2020 at 07:42:48AM +0100, Christoph Hellwig wrote:
> On Tue, Jul 14, 2020 at 02:49:23PM -0700, Kees Cook wrote:
> > On Tue, Jul 14, 2020 at 08:31:40AM -0500, Eric W. Biederman wrote:
> > > +static int count_strings_kernel(const char *const *argv)
> > > +{
> > > + int i;
> > > +
> >
From: Christoph Hellwig
> Sent: 15 July 2020 07:43
> Subject: Re: [PATCH 7/7] exec: Implement kernel_execve
>
> On Tue, Jul 14, 2020 at 02:49:23PM -0700, Kees Cook wrote:
> > On Tue, Jul 14, 2020 at 08:31:40AM -0500, Eric W. Biederman wrote:
> > > +static int coun
On Tue, Jul 14, 2020 at 02:49:23PM -0700, Kees Cook wrote:
> On Tue, Jul 14, 2020 at 08:31:40AM -0500, Eric W. Biederman wrote:
> > +static int count_strings_kernel(const char *const *argv)
> > +{
> > + int i;
> > +
> > + if (!argv)
> > + return 0;
> > +
> > + for (i = 0; argv[i]; +
> +static int count_strings_kernel(const char *const *argv)
> +{
> + int i;
> +
> + if (!argv)
> + return 0;
> +
> + for (i = 0; argv[i]; ++i) {
> + if (i >= MAX_ARG_STRINGS)
> + return -E2BIG;
> + if (fatal_signal_pending(current)
On Tue, Jul 14, 2020 at 08:31:40AM -0500, Eric W. Biederman wrote:
> +static int count_strings_kernel(const char *const *argv)
> +{
> + int i;
> +
> + if (!argv)
> + return 0;
> +
> + for (i = 0; argv[i]; ++i) {
> + if (i >= MAX_ARG_STRINGS)
> +
To allow the kernel not to play games with set_fs to call exec
implement kernel_execve. The function kernel_execve takes pointers
into kernel memory and copies the values pointed to onto the new
userspace stack.
The calls with arguments from kernel space of do_execve are replaced
with calls to
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