The following patches add the self-test for
sigaltstack(SS_DISABLE) inside the signal handler,
and allow an app to temporarily disable and re-enable
the sigaltstack within a sighandler.
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.
v2: avoid duplicating the "!sigstack" check in get_sigframe()
as requested by Andy Lutomirski.
arch/score/kernel/signal.c | 2
arch/x86/kernel/signal.c | 2
include/linux/sched.h | 8 +
include/linux/signal.h | 2
kernel/fork.c | 4
kernel/signal.c | 54 +++++++----
tools/testing/selftests/Makefile | 1
tools/testing/selftests/sigaltstack/Makefile | 8 +
tools/testing/selftests/sigaltstack/sas.c | 132
+++++++++++++++++++++++++++
9 files changed, 189 insertions(+), 24 deletions(-)
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