fix possible fd leak via missing O_CLOEXEC in pthread_setname_np

[musl] / src / mman / mremap.c

diff --git a/src/mman/mremap.c b/src/mman/mremap.c
index 596c45f..cc6991a 100644 (file)
--- a/src/mman/mremap.c
+++ b/src/mman/mremap.c
@@ -1,17 +1,30 @@
+#define _GNU_SOURCE
 #include <unistd.h>
 #include <sys/mman.h>
+#include <errno.h>
+#include <stdint.h>
 #include <stdarg.h>
 #include "syscall.h"
-#include "libc.h"
+
+static void dummy(void) { }
+weak_alias(dummy, __vm_wait);
 
 void *__mremap(void *old_addr, size_t old_len, size_t new_len, int flags, ...)
 {
        va_list ap;
-       void *new_addr;
-       
-       va_start(ap, flags);
-       new_addr = va_arg(ap, void *);
-       va_end(ap);
+       void *new_addr = 0;
+
+       if (new_len >= PTRDIFF_MAX) {
+               errno = ENOMEM;
+               return MAP_FAILED;
+       }
+
+       if (flags & MREMAP_FIXED) {
+               __vm_wait();
+               va_start(ap, flags);
+               new_addr = va_arg(ap, void *);
+               va_end(ap);
+       }
 
        return (void *)syscall(SYS_mremap, old_addr, old_len, new_len, flags, new_addr);
 }