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Subject[PATCH v3 0/2] make sigaltstack() compatible with swapcontext()
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The following patches make it possible to use swapcontext()
in a sighandler that works on sigaltstack.
The approach is inspired by Andy Lutomirski's suggestion that
sigaltstack should disarm itself after saving into uc_stack:
https://lkml.org/lkml/2016/2/1/594

I add the SS_AUTODISARM flag that does exactly that.
On sighandler exit, the sigaltstack is restored from uc_stack.
Another possible name could be SS_ONESHOT, but, since it gets
always re-enabled, I choose SS_AUTODISARM.

[PATCH 1/2] sigaltstack: implement SS_AUTODISARM flag
This patch implements SS_AUTODISARM flag
[PATCH 2/2] selftests: Add test for sigaltstack(SS_AUTODISARM)
This patch adds the selftest code for new functionality

CC: linux-kernel@vger.kernel.org
CC: linux-api@vger.kernel.org

Diffstat:
include/linux/sched.h | 1
include/linux/signal.h | 4
include/uapi/linux/signal.h | 3
kernel/fork.c | 4
kernel/signal.c | 23 ++--
tools/testing/selftests/Makefile | 1
tools/testing/selftests/sigaltstack/Makefile | 8 +
tools/testing/selftests/sigaltstack/sas.c | 151 +++++++++++++++++++++++++++
8 files changed, 182 insertions(+), 13 deletions(-)

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