* [PATCH 0/2] sigaltstack conformance fixes
@ 2018-02-07 1:04 Szabolcs Nagy
0 siblings, 0 replies; only message in thread
From: Szabolcs Nagy @ 2018-02-07 1:04 UTC (permalink / raw)
To: musl
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linux SS_AUTODISARM is non-conforming so remove it.
i opened http://austingroupbugs.net/view.php?id=1187
Szabolcs Nagy (2):
signal.h: remove SS_AUTODISARM
fix error checks in sigaltstack
include/signal.h | 2 --
src/signal/sigaltstack.c | 10 +++++-----
2 files changed, 5 insertions(+), 7 deletions(-)
--
2.15.0
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From 931fc1beb33bc52c4424c25649aa8321aa5372c5 Mon Sep 17 00:00:00 2001
From: Szabolcs Nagy <nsz@port70.net>
Date: Tue, 6 Feb 2018 23:46:55 +0000
Subject: [PATCH 1/2] signal.h: remove SS_AUTODISARM
this is the revert of
commit 9680e1d03a794b0e0d5815c749478228ed40a36d
Author: Szabolcs Nagy <nsz@port70.net>
Date: 2016-08-20 17:04:44 +0200
add SS_AUTODISARM sigaltstack ss_flags from linux v4.7 to signal.h
because it's not possible to support this feature in a conforming way
given the posix requirements about ss_flags handling in sigaltstack, see
http://www.openwall.com/lists/musl/2017/12/23/3
---
include/signal.h | 2 --
1 file changed, 2 deletions(-)
diff --git a/include/signal.h b/include/signal.h
index 2c8b3d55..a16094c5 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -239,8 +239,6 @@ void (*sigset(int, void (*)(int)))(int);
#define POLL_HUP 6
#define SS_ONSTACK 1
#define SS_DISABLE 2
-#define SS_AUTODISARM (1U << 31)
-#define SS_FLAG_BITS SS_AUTODISARM
#endif
#if defined(_BSD_SOURCE) || defined(_GNU_SOURCE)
--
2.15.0
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From c469f3741558427f3f82042ff4d1328e22e25795 Mon Sep 17 00:00:00 2001
From: Szabolcs Nagy <nsz@port70.net>
Date: Wed, 7 Feb 2018 00:01:02 +0000
Subject: [PATCH 2/2] fix error checks in sigaltstack
ss_size should not be checked if SS_DISABLE is set in ss->ss_flags and
posix requires other flags to fail.
the posix requirement may be too strict here, but musl should follow
the spec until that's resolved:
http://austingroupbugs.net/view.php?id=1187
---
src/signal/sigaltstack.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/src/signal/sigaltstack.c b/src/signal/sigaltstack.c
index 62cb81ad..017b53bc 100644
--- a/src/signal/sigaltstack.c
+++ b/src/signal/sigaltstack.c
@@ -4,13 +4,13 @@
int sigaltstack(const stack_t *restrict ss, stack_t *restrict old)
{
- if (ss) {
- if (ss->ss_size < MINSIGSTKSZ) {
- errno = ENOMEM;
+ if (ss && ss->ss_flags != SS_DISABLE) {
+ if (ss->ss_flags) {
+ errno = EINVAL;
return -1;
}
- if (ss->ss_flags & ~SS_DISABLE) {
- errno = EINVAL;
+ if (ss->ss_size < MINSIGSTKSZ) {
+ errno = ENOMEM;
return -1;
}
}
--
2.15.0
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