[PATCH v17 03/15] arm64: Introduce prctl() options to control the tagged user addresses ABI

Catalin Marinas catalin.marinas at arm.com
Wed Jun 19 15:29:39 UTC 2019

On Wed, Jun 19, 2019 at 04:45:02PM +0200, Andrey Konovalov wrote:
> On Wed, Jun 12, 2019 at 1:43 PM Andrey Konovalov <andreyknvl at google.com> wrote:
> > From: Catalin Marinas <catalin.marinas at arm.com>
> >
> > It is not desirable to relax the ABI to allow tagged user addresses into
> > the kernel indiscriminately. This patch introduces a prctl() interface
> > for enabling or disabling the tagged ABI with a global sysctl control
> > for preventing applications from enabling the relaxed ABI (meant for
> > testing user-space prctl() return error checking without reconfiguring
> > the kernel). The ABI properties are inherited by threads of the same
> > application and fork()'ed children but cleared on execve().
> >
> > The PR_SET_TAGGED_ADDR_CTRL will be expanded in the future to handle
> > MTE-specific settings like imprecise vs precise exceptions.
> >
> > Signed-off-by: Catalin Marinas <catalin.marinas at arm.com>
> Catalin, would you like to do the requested changes to this patch
> yourself and send it to me or should I do that?

I'll send you an updated version this week.


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