Add hardening for pwrite

1 files changed, 11 insertions, 0 deletions

diff --git a/include/unistd.h b/include/unistd.h
index 1c79711..e91f922 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -180,6 +180,17 @@ _FORTIFY_FN(write) ssize_t write(int __f, const void * _FORTIFY_POS0 __s,
         return __orig_write(__f, __s, __n);
 }
 
+__diagnose_as_builtin(__builtin_pwrite, 1, 2, 3, 4)
+_FORTIFY_FN(pwrite) ssize_t pwrite(int __f, const void * _FORTIFY_POS0 __s,
+                                 size_t __n, off_t __o)
+{
+        size_t __b = __bos(__s, 0);
+
+        if (__n > __b)
+                __builtin_trap();
+        return __orig_pwrite(__f, __s, __n, __o);
+}
+
 #ifdef __cplusplus
 }
 #endif