Move path validation tests before charset tests

The charset validation tests do exhaustive loops over all possible
codepoints.  This is very useful for ensuring correct behavior on all
inputs, but is slow enough (several seconds) to be annoying during
development.  Moving the path validation tests (which are very fast)
before the charset validation tests allows developers to conclude that
they have passed much sooner, since if they fail the code will crash
quickly.

(cherry picked from commit a656698)

qrexec-lib/validator-test.c

@@ -71,6 +71,54 @@ int main(int argc, char **argv)
     (void)argc;
     (void)argv;
     assert(qubes_pure_validate_file_name((uint8_t *)u8"simple_safe_filename.txt"));
+
+    // Directory traversal checks
+    assert(!qubes_pure_validate_file_name((uint8_t *)".."));
+    assert(!qubes_pure_validate_file_name((uint8_t *)"../.."));
+    assert(!qubes_pure_validate_file_name((uint8_t *)"a/.."));
+    assert(!qubes_pure_validate_file_name((uint8_t *)"a/../b"));
+    assert(!qubes_pure_validate_file_name((uint8_t *)"/"));
+    assert(!qubes_pure_validate_file_name((uint8_t *)"//"));
+    assert(!qubes_pure_validate_file_name((uint8_t *)"///"));
+    assert(!qubes_pure_validate_file_name((uint8_t *)"/a"));
+    assert(!qubes_pure_validate_file_name((uint8_t *)"//a"));
+    assert(!qubes_pure_validate_file_name((uint8_t *)"///a"));
+
+    // No repeated slashes
+    assert(!qubes_pure_validate_file_name((uint8_t *)"a//b"));
+
+    // No "." as a path component
+    assert(!qubes_pure_validate_file_name((uint8_t *)"."));
+    assert(!qubes_pure_validate_file_name((uint8_t *)"a/."));
+    assert(!qubes_pure_validate_file_name((uint8_t *)"./a"));
+    assert(!qubes_pure_validate_file_name((uint8_t *)"a/./a"));
+
+    // No ".." as a path component
+    assert(!qubes_pure_validate_file_name((uint8_t *)".."));
+    assert(!qubes_pure_validate_file_name((uint8_t *)"a/.."));
+    assert(!qubes_pure_validate_file_name((uint8_t *)"../a"));
+    assert(!qubes_pure_validate_file_name((uint8_t *)"a/../a"));
+
+    // Looks like "." or ".." but is not
+    assert(qubes_pure_validate_file_name((const uint8_t *)".a"));
+    assert(qubes_pure_validate_file_name((const uint8_t *)"..a"));
+
+    // Symbolic links
+    // Top level cannot be symlink
+    assert(!qubes_pure_validate_symbolic_link((const uint8_t *)"a", (const uint8_t *)"b"));
+    // Symbolic links cannot escape
+    assert(!qubes_pure_validate_symbolic_link((const uint8_t *)"a/b", (const uint8_t *)"../a"));
+    assert(!qubes_pure_validate_symbolic_link((const uint8_t *)"a/b", (const uint8_t *)"../a/b/c"));
+    assert(!qubes_pure_validate_symbolic_link((const uint8_t *)"a/b/c", (const uint8_t *)"../../a"));
+    assert(qubes_pure_validate_symbolic_link((const uint8_t *)"a/b", (const uint8_t *)"a"));
+    assert(qubes_pure_validate_symbolic_link((const uint8_t *)"a/b/c", (const uint8_t *)"../a"));
+    // Absolute symlinks are rejected
+    assert(!qubes_pure_validate_symbolic_link((const uint8_t *)"a/b/c", (const uint8_t *)"/a"));
+    // Symlinks may end in "..".
+    assert(qubes_pure_validate_symbolic_link((const uint8_t *)"a/b/c", (const uint8_t *)".."));
+    // Symlinks may end in "/".
+    assert(qubes_pure_validate_symbolic_link((const uint8_t *)"a/b/c", (const uint8_t *)"a/"));
+
     // Greek letters are safe
     assert(qubes_pure_validate_file_name((uint8_t *)u8"\u03b2.txt"));
     assert(qubes_pure_validate_file_name((uint8_t *)u8"\u03b1.txt"));
@@ -174,51 +222,4 @@ int main(int argc, char **argv)
             assert(j < 0x10FFFFE);
         }
     }
-
-    // Directory traversal checks
-    assert(!qubes_pure_validate_file_name((uint8_t *)".."));
-    assert(!qubes_pure_validate_file_name((uint8_t *)"../.."));
-    assert(!qubes_pure_validate_file_name((uint8_t *)"a/.."));
-    assert(!qubes_pure_validate_file_name((uint8_t *)"a/../b"));
-    assert(!qubes_pure_validate_file_name((uint8_t *)"/"));
-    assert(!qubes_pure_validate_file_name((uint8_t *)"//"));
-    assert(!qubes_pure_validate_file_name((uint8_t *)"///"));
-    assert(!qubes_pure_validate_file_name((uint8_t *)"/a"));
-    assert(!qubes_pure_validate_file_name((uint8_t *)"//a"));
-    assert(!qubes_pure_validate_file_name((uint8_t *)"///a"));
-
-    // No repeated slashes
-    assert(!qubes_pure_validate_file_name((uint8_t *)"a//b"));
-
-    // No "." as a path component
-    assert(!qubes_pure_validate_file_name((uint8_t *)"."));
-    assert(!qubes_pure_validate_file_name((uint8_t *)"a/."));
-    assert(!qubes_pure_validate_file_name((uint8_t *)"./a"));
-    assert(!qubes_pure_validate_file_name((uint8_t *)"a/./a"));
-
-    // No ".." as a path component
-    assert(!qubes_pure_validate_file_name((uint8_t *)".."));
-    assert(!qubes_pure_validate_file_name((uint8_t *)"a/.."));
-    assert(!qubes_pure_validate_file_name((uint8_t *)"../a"));
-    assert(!qubes_pure_validate_file_name((uint8_t *)"a/../a"));
-
-    // Looks like "." or ".." but is not
-    assert(qubes_pure_validate_file_name((const uint8_t *)".a"));
-    assert(qubes_pure_validate_file_name((const uint8_t *)"..a"));
-
-    // Symbolic links
-    // Top level cannot be symlink
-    assert(!qubes_pure_validate_symbolic_link((const uint8_t *)"a", (const uint8_t *)"b"));
-    // Symbolic links cannot escape
-    assert(!qubes_pure_validate_symbolic_link((const uint8_t *)"a/b", (const uint8_t *)"../a"));
-    assert(!qubes_pure_validate_symbolic_link((const uint8_t *)"a/b", (const uint8_t *)"../a/b/c"));
-    assert(!qubes_pure_validate_symbolic_link((const uint8_t *)"a/b/c", (const uint8_t *)"../../a"));
-    assert(qubes_pure_validate_symbolic_link((const uint8_t *)"a/b", (const uint8_t *)"a"));
-    assert(qubes_pure_validate_symbolic_link((const uint8_t *)"a/b/c", (const uint8_t *)"../a"));
-    // Absolute symlinks are rejected
-    assert(!qubes_pure_validate_symbolic_link((const uint8_t *)"a/b/c", (const uint8_t *)"/a"));
-    // Symlinks may end in "..".
-    assert(qubes_pure_validate_symbolic_link((const uint8_t *)"a/b/c", (const uint8_t *)".."));
-    // Symlinks may end in "/".
-    assert(qubes_pure_validate_symbolic_link((const uint8_t *)"a/b/c", (const uint8_t *)"a/"));
 }