ash: strip path from NOFORK applet names

Commit 26ba73098 (win32: search PATH for missing Unix-style
executables) extended the cases in which PATH would be searched
for executables specified with a Unix-style path.

A side effect of this change was to pass the Unix-style path as
argv[0] to NOFORK applets.  The 'uname' applet examines argv[0]
to determine how to behave.  When invoked as '/bin/uname' it
returned unexpected results.  Other applets may be similarly
affected.

When a NOFORK applet is invoked in evalcommand(), strip any path.

Costs 16 bytes.

(GitHub issue #392)

1 files changed, 3 insertions, 0 deletions

diff --git a/shell/ash.c b/shell/ash.c
index 31d3c1013..d312cb8cd 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -11688,6 +11688,9 @@ evalcommand(union node *cmd, int flags)
                          * and/or wait for user input ineligible for NOFORK:
                          * for example, "yes" or "rm" (rm -i waits for input).
                          */
+#if ENABLE_PLATFORM_MINGW32
+                        argv[0] = (char *)bb_basename(argv[0]);
+#endif
                         exitstatus = run_nofork_applet(applet_no, argv);
                         environ = sv_environ;
                         /*