ash: copy environment variables when importing them

Clearing the environment on Microsoft Windows results in pointers
used for shell variables becoming invalid.  Take copies when the
environment is imported.

This only affects NOFORK applets invoked by tryexec, but the number
of NOFORK applets has increased considerably in recent years.

1 files changed, 4 insertions, 0 deletions

diff --git a/shell/ash.c b/shell/ash.c
index 586925835..2d51b48f9 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -14502,7 +14502,11 @@ init(void)
  * os.execv("ash", [ 'ash', '-c', 'env | grep test-test' ])  # breaks this
  */
                         if (strchr(*envp, '=')) {
+#if !ENABLE_PLATFORM_MINGW32
                                 setvareq(*envp, VEXPORT|VTEXTFIXED);
+#else
+                                setvareq(*envp, VEXPORT);
+#endif
                         }
                 }