IsolateTracer: fix _access_check's handling of /proc/self

When `real == proc_dir`, `os.path.relpath(real, proc_dir)` returns `.`
VNOI-Admin · May 19, 2024 · a2f7218 · a2f7218
1 parent fab8cf2
commit a2f7218
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/dmoj/cptbox/isolate.py b/dmoj/cptbox/isolate.py
@@ -405,7 +405,9 @@ def _access_check(self, debugger: Debugger, file: str, fs_jail: FilesystemPolicy
 
         if normalized != real:
             proc_dir = f'/proc/{debugger.tid}'
-            if real.startswith(proc_dir):
+            if real == proc_dir:
+                real = '/proc/self'
+            elif real.startswith(proc_dir):
                 real = os.path.join('/proc/self', os.path.relpath(real, proc_dir))
 
             if not fs_jail.check(real):