On Fri, May 03, 2019 at 02:10:20PM -0400, Joel Savitz wrote:
> +/* Get the process virtual memory size (i.e. the highest usable VM address)
> */
> +#define PR_GET_TASK_SIZE 55
TASK_SIZE is in fact the lowest _un_usable address. :^)
On Fri, May 3, 2019 at 2:12 PM Joel Savitz wrote:
> When PR_GET_TASK_SIZE is passed to prctl, the kernel will attempt to
> copy the value of TASK_SIZE to the userspace address in arg2.
A commit message shouldn't just describe what you're doing, but also
why you're doing it. Is this intended for p
On Fri, May 03, 2019 at 02:08:31PM -0700, Yury Norov wrote:
> On Fri, May 03, 2019 at 02:10:20PM -0400, Joel Savitz wrote:
> > When PR_GET_TASK_SIZE is passed to prctl, the kernel will attempt to
> > copy the value of TASK_SIZE to the userspace address in arg2.
> >
> > It is important that we acco
On Fri, May 03, 2019 at 02:08:31PM -0700, Yury Norov wrote:
> On Fri, May 03, 2019 at 02:10:20PM -0400, Joel Savitz wrote:
> > When PR_GET_TASK_SIZE is passed to prctl, the kernel will attempt to
> > copy the value of TASK_SIZE to the userspace address in arg2.
> >
> > It is important that we acco
On Fri, May 03, 2019 at 02:10:20PM -0400, Joel Savitz wrote:
> When PR_GET_TASK_SIZE is passed to prctl, the kernel will attempt to
> copy the value of TASK_SIZE to the userspace address in arg2.
>
> It is important that we account for the case of the userspace task
> running in 32-bit compat mode
When PR_GET_TASK_SIZE is passed to prctl, the kernel will attempt to
copy the value of TASK_SIZE to the userspace address in arg2.
It is important that we account for the case of the userspace task
running in 32-bit compat mode on a 64-bit kernel. As such, we must be
careful to copy the correct nu
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