On Thu, Apr 01, 2021 at 11:15:43AM +, David Laight wrote:
> From: Will Deacon
> > Sent: 01 April 2021 09:31
> ...
> > > +/*
> > > + * These macros must be used during syscall entry when interrupts and
> > > + * preempt are disabled, and after user registers have been stored to
> > > + * the sta
From: Will Deacon
> Sent: 01 April 2021 09:31
...
> > +/*
> > + * These macros must be used during syscall entry when interrupts and
> > + * preempt are disabled, and after user registers have been stored to
> > + * the stack.
> > + */
> > +#define add_random_kstack_offset() do {
On Tue, Mar 30, 2021 at 01:57:47PM -0700, Kees Cook wrote:
> diff --git a/include/linux/randomize_kstack.h
> b/include/linux/randomize_kstack.h
> new file mode 100644
> index ..351520803006
> --- /dev/null
> +++ b/include/linux/randomize_kstack.h
> @@ -0,0 +1,55 @@
> +/* SPDX-License-I
On Thu, Apr 01, 2021 at 12:38:31AM +0200, Thomas Gleixner wrote:
> On Wed, Mar 31 2021 at 14:54, Kees Cook wrote:
> > On Wed, Mar 31, 2021 at 09:53:26AM +0200, Thomas Gleixner wrote:
> >> On Tue, Mar 30 2021 at 13:57, Kees Cook wrote:
> >> > +/*
> >> > + * Do not use this anywhere else in the kerne
On Wed, Mar 31 2021 at 14:54, Kees Cook wrote:
> On Wed, Mar 31, 2021 at 09:53:26AM +0200, Thomas Gleixner wrote:
>> On Tue, Mar 30 2021 at 13:57, Kees Cook wrote:
>> > +/*
>> > + * Do not use this anywhere else in the kernel. This is used here because
>> > + * it provides an arch-agnostic way to g
On Wed, Mar 31, 2021 at 09:53:26AM +0200, Thomas Gleixner wrote:
> On Tue, Mar 30 2021 at 13:57, Kees Cook wrote:
> > +/*
> > + * Do not use this anywhere else in the kernel. This is used here because
> > + * it provides an arch-agnostic way to grow the stack with correct
> > + * alignment. Also, s
On Tue, Mar 30 2021 at 13:57, Kees Cook wrote:
> +/*
> + * Do not use this anywhere else in the kernel. This is used here because
> + * it provides an arch-agnostic way to grow the stack with correct
> + * alignment. Also, since this use is being explicitly masked to a max of
> + * 10 bits, stack-c
This provides the ability for architectures to enable kernel stack base
address offset randomization. This feature is controlled by the boot
param "randomize_kstack_offset=on/off", with its default value set by
CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT.
This feature is based on the original idea from
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