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-rw-r--r--arch/i386/bits/signal.h2
-rw-r--r--arch/x86_64/bits/signal.h2
-rw-r--r--src/signal/sigaltstack.c12
3 files changed, 15 insertions, 1 deletions
diff --git a/arch/i386/bits/signal.h b/arch/i386/bits/signal.h
index 4956a0d9..74d9d025 100644
--- a/arch/i386/bits/signal.h
+++ b/arch/i386/bits/signal.h
@@ -131,6 +131,8 @@ struct __siginfo
#define POLL_HUP 6
#define SS_ONSTACK 1
#define SS_DISABLE 2
+#define MINSIGSTKSZ 2048
+#define SIGSTKSZ 8192
#endif
#define SA_NOCLDSTOP 1
diff --git a/arch/x86_64/bits/signal.h b/arch/x86_64/bits/signal.h
index f2c92d09..ddebe90d 100644
--- a/arch/x86_64/bits/signal.h
+++ b/arch/x86_64/bits/signal.h
@@ -137,6 +137,8 @@ struct __siginfo
#define POLL_HUP 6
#define SS_ONSTACK 1
#define SS_DISABLE 2
+#define MINSIGSTKSZ 2048
+#define SIGSTKSZ 8192
#endif
#define SA_NOCLDSTOP 1
diff --git a/src/signal/sigaltstack.c b/src/signal/sigaltstack.c
index 3cc2d456..6e46d098 100644
--- a/src/signal/sigaltstack.c
+++ b/src/signal/sigaltstack.c
@@ -1,8 +1,18 @@
#include <signal.h>
+#include <errno.h>
#include "syscall.h"
int sigaltstack(const stack_t *ss, stack_t *old)
{
- /* depends on kernel struct matching */
+ if (ss) {
+ if (ss->ss_size < MINSIGSTKSZ) {
+ errno = ENOMEM;
+ return -1;
+ }
+ if (ss->ss_flags & ~SS_DISABLE) {
+ errno = EINVAL;
+ return -1;
+ }
+ }
return syscall2(__NR_sigaltstack, (long)ss, (long)old);
}