From f9eebda93ce811bbce7ef9942db2e80aceb89c09 Mon Sep 17 00:00:00 2001
From: =?utf8?q?P=C3=A1draig=20Brady?= <P@draigBrady.com>
Date: Wed, 21 Jan 2026 17:31:24 +0000
Subject: [PATCH] tests: avoid false failure with sanitizer builds

* init.cfg (sanitizer_build_): Add a helper to detect if a program
is built against a sanitizer.
* tests/df/no-mtab-status-masked-proc.sh: Skip if a sanitizer build.
---
 init.cfg                               | 7 +++++++
 tests/df/no-mtab-status-masked-proc.sh | 5 ++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/init.cfg b/init.cfg
index f453279bfa..9224c5df0f 100644
--- a/init.cfg
+++ b/init.cfg
@@ -850,4 +850,11 @@ uses_strace_ ()
   fi
 }
 
+# Return true if passed program is built with ASAN, or UBSAN etc.
+sanitizer_build_()
+{
+  env $(printf '%sSAN_OPTIONS=help=1 ' A UB L M T) "$1" --version 2>&1 |
+  grep '[Ss]anitizer' >/dev/null
+}
+
 sanitize_path_
diff --git a/tests/df/no-mtab-status-masked-proc.sh b/tests/df/no-mtab-status-masked-proc.sh
index 11975ea204..fccf7cd788 100755
--- a/tests/df/no-mtab-status-masked-proc.sh
+++ b/tests/df/no-mtab-status-masked-proc.sh
@@ -22,6 +22,9 @@
 print_ver_ df
 skip_if_root_
 
+# Sanitizers need to read from /proc
+sanitizer_build_ df && skip_ 'Sanitizer not supported'
+
 # Protect against inaccessible remote mounts etc.
 timeout 10 df || skip_ "df fails"
 
@@ -30,7 +33,7 @@ unshare -rm true || skip_ 'User namespace sandbox is disabled'
 # mask /proc
 df() {
   unshare -rm $SHELL -c \
-    "mount -t tmpfs tmpfs /proc && command df \"\$@\"" -- "$@";
+    "mount -t tmpfs tmpfs /proc && env df \"\$@\"" -- "$@";
 }
 
 df /proc || fail=1
-- 
2.47.3