selftests/exec: allow shell return code of 126

When the shell fails to invoke a script because its path name
is too long (ENAMETOOLONG), most shells return 127 to indicate
command not found.  However, some systems report 126 (which POSIX
suggests should indicate a non-executable file) for this case,
so allow that too.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: David Drysdale <drysdale@google.com>
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

diff --git a/tools/testing/selftests/exec/execveat.c b/tools/testing/selftests/exec/execveat.c
index d273624..e238c95 100644 (file)
--- a/tools/testing/selftests/exec/execveat.c
+++ b/tools/testing/selftests/exec/execveat.c
@@ -62,7 +62,7 @@ static int _check_execveat_fail(int fd, const char *path, int flags,
 }
 
 static int check_execveat_invoked_rc(int fd, const char *path, int flags,
-                                    int expected_rc)
+                                    int expected_rc, int expected_rc2)
 {
        int status;
        int rc;
@@ -98,9 +98,10 @@ static int check_execveat_invoked_rc(int fd, const char *path, int flags,
                        child, status);
                return 1;
        }
-       if (WEXITSTATUS(status) != expected_rc) {
-               printf("[FAIL] (child %d exited with %d not %d)\n",
-                       child, WEXITSTATUS(status), expected_rc);
+       if ((WEXITSTATUS(status) != expected_rc) &&
+           (WEXITSTATUS(status) != expected_rc2)) {
+               printf("[FAIL] (child %d exited with %d not %d nor %d)\n",
+                       child, WEXITSTATUS(status), expected_rc, expected_rc2);
                return 1;
        }
        printf("[OK]\n");
@@ -109,7 +110,7 @@ static int check_execveat_invoked_rc(int fd, const char *path, int flags,
 
 static int check_execveat(int fd, const char *path, int flags)
 {
-       return check_execveat_invoked_rc(fd, path, flags, 99);
+       return check_execveat_invoked_rc(fd, path, flags, 99, 99);
 }
 
 static char *concat(const char *left, const char *right)
@@ -192,9 +193,15 @@ static int check_execveat_pathmax(int dot_dfd, const char *src, int is_script)
         * Execute as a long pathname relative to ".".  If this is a script,
         * the interpreter will launch but fail to open the script because its
         * name ("/dev/fd/5/xxx....") is bigger than PATH_MAX.
+        *
+        * The failure code is usually 127 (POSIX: "If a command is not found,
+        * the exit status shall be 127."), but some systems give 126 (POSIX:
+        * "If the command name is found, but it is not an executable utility,
+        * the exit status shall be 126."), so allow either.
         */
        if (is_script)
-               fail += check_execveat_invoked_rc(dot_dfd, longpath, 0, 127);
+               fail += check_execveat_invoked_rc(dot_dfd, longpath, 0,
+                                                 127, 126);
        else
                fail += check_execveat(dot_dfd, longpath, 0);