[PATCH 2/5] arm64: signal: Refactor sigcontext parsing in rt_sigreturn

[Catalin Marinas]

On Thu, Jun 15, 2017 at 03:03:39PM +0100, Dave P Martin wrote:
> Currently, rt_sigreturn does very limited checking on the
> sigcontext coming from userspace.
> 
> Future additions to the sigcontext data will increase the potential
> for surprises.  Also, it is not clear whether the sigcontext
> extension records are supposed to occur in a particular order.
> 
> To allow the parsing code to be extended more easily, this patch
> factors out the sigcontext parsing into a separate function, and
> adds extra checks to validate the well-formedness of the sigcontext
> structure.
> 
> Signed-off-by: Dave Martin <Dave.Martin at arm.com>

Reviewed-by: Catalin Marinas <catalin.marinas at arm.com>