From 0df50640a4ece7c74f17827f158f6c8812c6bede Mon Sep 17 00:00:00 2001
From: Andreas Schwab <schwab@suse.de>
Date: Thu, 20 Nov 2025 12:16:15 +0100
Subject: [PATCH] Use __fstat64_time64 in __fts64_children_time64 (bug 33653)

Make sure that fts_safe_changedir can handle a directory with a time stamp
after y2038.
---
 io/Makefile               |  1 +
 io/fts.c                  |  5 +++--
 io/fts64-time64.c         |  1 +
 io/fts64.c                |  1 +
 io/tst-fts-time64-y2038.c |  3 +++
 io/tst-fts.c              | 35 ++++++++++++++++++++++++++++++++++-
 6 files changed, 43 insertions(+), 3 deletions(-)
 create mode 100644 io/tst-fts-time64-y2038.c

diff --git a/io/Makefile b/io/Makefile
index 435f5a994f..269a3151a2 100644
--- a/io/Makefile
+++ b/io/Makefile
@@ -235,6 +235,7 @@ tests := \
 tests-time64 := \
   tst-fcntl-time64 \
   tst-fts-time64 \
+  tst-fts-time64-y2038 \
   tst-futimens-time64 \
   tst-futimes-time64\
   tst-futimesat-time64 \
diff --git a/io/fts.c b/io/fts.c
index d03b059177..674a98530d 100644
--- a/io/fts.c
+++ b/io/fts.c
@@ -85,6 +85,7 @@ static char sccsid[] = "@(#)fts.c	8.6 (Berkeley) 8/14/94";
 # define STRUCT_STAT stat
 # define STAT __stat
 # define LSTAT __lstat
+# define FSTAT __fstat
 #endif
 
 static FTSENTRY	*fts_alloc (FTSOBJ *, const char *, size_t);
@@ -1111,14 +1112,14 @@ static int
 fts_safe_changedir (FTSOBJ *sp, FTSENTRY *p, int fd, const char *path)
 {
 	int ret, oerrno, newfd;
-	struct stat64 sb;
+	struct STRUCT_STAT sb;
 
 	newfd = fd;
 	if (ISSET(FTS_NOCHDIR))
 		return (0);
 	if (fd < 0 && (newfd = __open(path, O_RDONLY, 0)) < 0)
 		return (-1);
-	if (__fstat64(newfd, &sb)) {
+	if (FSTAT (newfd, &sb)) {
 		ret = -1;
 		goto bail;
 	}
diff --git a/io/fts64-time64.c b/io/fts64-time64.c
index cd36125d7d..f8b7b590a0 100644
--- a/io/fts64-time64.c
+++ b/io/fts64-time64.c
@@ -30,6 +30,7 @@
 # define STRUCT_STAT __stat64_t64
 # define STAT __stat64_time64
 # define LSTAT __lstat64_time64
+# define FSTAT __fstat64_time64
 
 # include "fts.c"
 #endif
diff --git a/io/fts64.c b/io/fts64.c
index 41c079b664..cf67cc19f7 100644
--- a/io/fts64.c
+++ b/io/fts64.c
@@ -27,5 +27,6 @@
 #define STRUCT_STAT stat64
 #define STAT __stat64
 #define LSTAT __lstat64
+#define FSTAT __fstat64
 
 #include "fts.c"
diff --git a/io/tst-fts-time64-y2038.c b/io/tst-fts-time64-y2038.c
new file mode 100644
index 0000000000..bddf259b0c
--- /dev/null
+++ b/io/tst-fts-time64-y2038.c
@@ -0,0 +1,3 @@
+/* Test for bug 33653 in fts_safe_changedir.  */
+#define TST_FTS_Y2038
+#include "tst-fts.c"
diff --git a/io/tst-fts.c b/io/tst-fts.c
index d97aaef431..c472c1b4cc 100644
--- a/io/tst-fts.c
+++ b/io/tst-fts.c
@@ -26,6 +26,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <utime.h>
 
 static void prepare (void);
 static int do_test (void);
@@ -54,6 +55,28 @@ make_dir (const char *dirname)
   add_temp_file (name);
 }
 
+#ifdef TST_FTS_Y2038
+static void
+set_time_y2038 (const char *dirname)
+{
+  char *name;
+  if (asprintf (&name, "%s/%s", fts_test_dir, dirname) < 0)
+    {
+      puts ("out of memory");
+      exit (1);
+    }
+
+  struct utimbuf ut = { 0x100000000, 0x100000000 };
+  if (utime (name, &ut) < 0)
+    {
+      printf ("cannot set time on dir \"%s\": %m\n", name);
+      exit (1);
+    }
+
+  free (name);
+}
+#endif
+
 static void
 make_file (const char *filename)
 {
@@ -108,6 +131,10 @@ prepare (void)
   make_file ("bbb/1234");
   make_file ("bbb/5678");
   make_file ("bbb/90ab");
+
+#ifdef TST_FTS_Y2038
+  set_time_y2038 ("bbb");
+#endif
 }
 
 /* Largest name wins, otherwise strcmp.  */
@@ -160,7 +187,13 @@ do_test (void)
 {
   char *paths[2] = { fts_test_dir, NULL };
   FTS *fts;
-  fts = fts_open (paths, FTS_LOGICAL, &compare_ents);
+  int flags = 0;
+  /* FTS_LOGICAL implies FTS_NOCHDIR, thus when testing for bug 33653,
+     don't use FTS_LOGICAL.  */
+#ifndef TST_FTS_Y2038
+  flags |= FTS_LOGICAL;
+#endif
+  fts = fts_open (paths, flags, &compare_ents);
   if (fts == NULL)
     {
       printf ("FAIL: fts_open: %m\n");