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Date: Tue, 30 Jul 2013 15:13:46 +0300
From: Timo Teräs <timo.teras@....fi>
To: musl@...ts.openwall.com
Cc: Timo Teräs <timo.teras@....fi>
Subject: [PATCH] use separate sigaction buffers for old and new data
in signal() it is needed since __sigaction uses restrict in parameters
and sharing the buffer is technically an aliasing error. do the same
for the syscall, as at least qemu-user does not handle it properly.
---
src/signal/sigaction.c | 10 +++++-----
src/signal/signal.c | 6 +++---
2 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/src/signal/sigaction.c b/src/signal/sigaction.c
index 7a72a44..1f09bb9 100644
--- a/src/signal/sigaction.c
+++ b/src/signal/sigaction.c
@@ -14,7 +14,7 @@ weak_alias(dummy, __pthread_self_def);
int __libc_sigaction(int sig, const struct sigaction *restrict sa, struct sigaction *restrict old)
{
- struct k_sigaction ksa;
+ struct k_sigaction ksa, ksa_old;
if (sa) {
if ((uintptr_t)sa->sa_handler > 1UL)
__pthread_self_def();
@@ -23,12 +23,12 @@ int __libc_sigaction(int sig, const struct sigaction *restrict sa, struct sigact
ksa.restorer = (sa->sa_flags & SA_SIGINFO) ? __restore_rt : __restore;
memcpy(&ksa.mask, &sa->sa_mask, sizeof ksa.mask);
}
- if (syscall(SYS_rt_sigaction, sig, sa?&ksa:0, old?&ksa:0, sizeof ksa.mask))
+ if (syscall(SYS_rt_sigaction, sig, sa?&ksa:0, old?&ksa_old:0, sizeof ksa.mask))
return -1;
if (old) {
- old->sa_handler = ksa.handler;
- old->sa_flags = ksa.flags;
- memcpy(&old->sa_mask, &ksa.mask, sizeof ksa.mask);
+ old->sa_handler = ksa_old.handler;
+ old->sa_flags = ksa_old.flags;
+ memcpy(&old->sa_mask, &ksa_old.mask, sizeof ksa_old.mask);
}
return 0;
}
diff --git a/src/signal/signal.c b/src/signal/signal.c
index 07346a8..9d2f23a 100644
--- a/src/signal/signal.c
+++ b/src/signal/signal.c
@@ -7,10 +7,10 @@ int __sigaction(int, const struct sigaction *, struct sigaction *);
void (*signal(int sig, void (*func)(int)))(int)
{
- struct sigaction sa = { .sa_handler = func, .sa_flags = SA_RESTART };
- if (__sigaction(sig, &sa, &sa) < 0)
+ struct sigaction sa_old, sa = { .sa_handler = func, .sa_flags = SA_RESTART };
+ if (__sigaction(sig, &sa, &sa_old) < 0)
return SIG_ERR;
- return sa.sa_handler;
+ return sa_old.sa_handler;
}
weak_alias(signal, bsd_signal);
--
1.8.3.3
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