fix integer overflow in WIFSTOPPED macro

[musl] / src / mman / mmap.c

diff --git a/src/mman/mmap.c b/src/mman/mmap.c
index b85f25c..43e5e02 100644 (file)
--- a/src/mman/mmap.c
+++ b/src/mman/mmap.c
@@ -4,16 +4,16 @@
 #include <stdint.h>
 #include <limits.h>
 #include "syscall.h"
-#include "libc.h"
 
 static void dummy(void) { }
 weak_alias(dummy, __vm_wait);
 
 #define UNIT SYSCALL_MMAP2_UNIT
-#define OFF_MASK ((-0x2000ULL << (8*sizeof(long)-1)) | (UNIT-1))
+#define OFF_MASK ((-0x2000ULL << (8*sizeof(syscall_arg_t)-1)) | (UNIT-1))
 
 void *__mmap(void *start, size_t len, int prot, int flags, int fd, off_t off)
 {
+       long ret;
        if (off & OFF_MASK) {
                errno = EINVAL;
                return MAP_FAILED;
@@ -26,12 +26,14 @@ void *__mmap(void *start, size_t len, int prot, int flags, int fd, off_t off)
                __vm_wait();
        }
 #ifdef SYS_mmap2
-       return (void *)syscall(SYS_mmap2, start, len, prot, flags, fd, off/UNIT);
+       ret = __syscall(SYS_mmap2, start, len, prot, flags, fd, off/UNIT);
 #else
-       return (void *)syscall(SYS_mmap, start, len, prot, flags, fd, off);
+       ret = __syscall(SYS_mmap, start, len, prot, flags, fd, off);
 #endif
+       /* Fixup incorrect EPERM from kernel. */
+       if (ret == -EPERM && !start && (flags&MAP_ANON) && !(flags&MAP_FIXED))
+               ret = -ENOMEM;
+       return (void *)__syscall_ret(ret);
 }
 
 weak_alias(__mmap, mmap);
-
-LFS64(mmap);