fix sigaltstack to ignore ss_size with SS_DISABLE, per POSIX

[android-x86/external-musl-libc.git] / src / signal / sigaltstack.c

diff --git a/src/signal/sigaltstack.c b/src/signal/sigaltstack.c
index 62cb81a..d3a6e82 100644 (file)
--- a/src/signal/sigaltstack.c
+++ b/src/signal/sigaltstack.c
@@ -5,11 +5,11 @@
 int sigaltstack(const stack_t *restrict ss, stack_t *restrict old)
 {
        if (ss) {
-               if (ss->ss_size < MINSIGSTKSZ) {
+               if (!(ss->ss_flags & SS_DISABLE) && ss->ss_size < MINSIGSTKSZ) {
                        errno = ENOMEM;
                        return -1;
                }
-               if (ss->ss_flags & ~SS_DISABLE) {
+               if (ss->ss_flags & SS_ONSTACK) {
                        errno = EINVAL;
                        return -1;
                }