Messages in this thread | | | From | Stas Sergeev <> | Subject | [PATCH v3 0/2] make sigaltstack() compatible with swapcontext() | Date | Mon, 29 Feb 2016 00:13:18 +0300 |
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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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