linux-kernel - [PATCH 0/2] sigaltstack: remove EPERM check

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Date:	Sat, 9 Jan 2016 04:00:00 +0300
From:	Stas Sergeev <stsp@...t.ru>
To:	Linux kernel <linux-kernel@...r.kernel.org>
Cc:	linux-api@...r.kernel.org, Andy Lutomirski <luto@...capital.net>
Subject: [PATCH 0/2] sigaltstack: remove EPERM check

The following patches add the self-test for
sigaltstack(SS_DISABLE) inside the signal handler,
and remove the EPERM check in a sigaltstack()
syscall.
This is needed to make sigaltstack() compatible with
swapcontext(): before using swapcontext() inside
the sighandler, the sigaltstack should be disabled, or
the stack will be corrupted by the subsequent signals.