Index: test/sanitizer_common/ios_commands/iossim_run.py
===================================================================
--- test/sanitizer_common/ios_commands/iossim_run.py
+++ test/sanitizer_common/ios_commands/iossim_run.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python
 
-import os, sys, subprocess
+import glob, os, sys, subprocess
 
 
 if not "SANITIZER_IOSSIM_TEST_DEVICE_IDENTIFIER" in os.environ:
@@ -12,7 +12,29 @@
   if e in os.environ:
     os.environ["SIMCTL_CHILD_" + e] = os.environ[e]
 
-exitcode = subprocess.call(["xcrun", "simctl", "spawn", device_id] + sys.argv[1:])
+prog = sys.argv[1]
+exit_code = None
+if prog == 'rm':
+  # The simulator and host actually share the same file system so we can just
+  # execute directly on the host.
+  rm_args = sys.argv[2:]
+  rm_args_expanded = []
+  for arg in rm_args:
+    # We might get glob patterns that are intended to be resolved on the device.
+    # Here we can just resolve them on the host.
+    if '*' in arg or '?' in arg:
+      matches = glob.glob(arg)
+      if len(matches) > 0:
+        rm_args_expanded.extend(matches)
+      else:
+        # Just pass through unexpanded if we can't find a match.
+        rm_args_expanded.append(arg)
+    else:
+      rm_args_expanded.append(arg)
+  rm_cmd_line = ["/bin/rm"] + rm_args_expanded
+  exitcode = subprocess.call(rm_cmd_line)
+else:
+  exitcode = subprocess.call(["xcrun", "simctl", "spawn", device_id] + sys.argv[1:])
 if exitcode > 125:
   exitcode = 126
 sys.exit(exitcode)
Index: test/ubsan/TestCases/Misc/log-path_test.cc
===================================================================
--- test/ubsan/TestCases/Misc/log-path_test.cc
+++ test/ubsan/TestCases/Misc/log-path_test.cc
@@ -12,11 +12,13 @@
 
 // Good log_path.
 // RUN: rm -f %t.log.*
+// RUN: %run rm -f '%t.log.*'
 // RUN: %env_ubsan_opts=log_path='"%t.log"' %run %t -4 2> %t.out
 // RUN: FileCheck %s --check-prefix=CHECK-ERROR < %t.log.*
 
 // Run w/o errors should not produce any log.
 // RUN: rm -f %t.log.*
+// RUN: %run rm -f '%t.log.*'
 // RUN: %env_ubsan_opts=log_path='"%t.log"'  %run %t 4
 // RUN: not cat %t.log.*