From 1ceedbeed2eb69b36831179ae418712b237192d9 Mon Sep 17 00:00:00 2001
From: Florian Schmaus <flo@geekplace.eu>
Date: Mon, 20 Jul 2026 13:35:39 +0200
Subject: [PATCH] procfs: Swallow InvalidFileFormat when parsing ns/pid

Summary:

When running below as an unprivileged user, reading /proc/1/ns/pid may
yield an empty string due to permissions, resulting in an
InvalidFileFormat error instead of an IoError. Fix below invocations as
unprivileged user by ignoring InvalidFileFormat in
read_all_pid_info_from_path (similar to EACCES) so that execution does
not abort early when encountering an inaccessible process namespace.
---
 below/procfs/src/lib.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/below/procfs/src/lib.rs b/below/procfs/src/lib.rs
index e8955774..61b49b54 100644
--- a/below/procfs/src/lib.rs
+++ b/below/procfs/src/lib.rs
@@ -1104,6 +1104,7 @@ impl ProcReader {
                 Err(Error::IoError(_, ref e))
                     if e.raw_os_error()
                         .is_some_and(|ec| ec == ENOENT || ec == ESRCH || ec == EACCES) => {}
+                Err(Error::InvalidFileFormat(_)) => {}
                 res => pidinfo.pid_ns = Some(res?),
             }