From 68c1a3a7b8277cb225ab221c3a6a4f239b81c9e1 Mon Sep 17 00:00:00 2001
From: shenyangyang <[email protected]>
Date: Mon, 2 Sep 2019 22:30:32 -0400
Subject: [PATCH] bugfix-Forbidden-non-root-user-to-clear-history

---
 bashhist.c             | 5 +++--
 lib/readline/history.c | 8 +++++++-
 lib/readline/history.h | 2 +-
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/bashhist.c b/bashhist.c
index 90cd8c3..7c73492 100644
--- a/bashhist.c
+++ b/bashhist.c
@@ -345,8 +345,9 @@ load_history ()
 void
 bash_clear_history ()
 {
-  clear_history ();
-  history_lines_this_session = 0;
+  int ret = clear_history ();
+  if (ret == 0)
+    history_lines_this_session = 0;
   /* XXX - reset history_lines_read_from_file? */
 }
 
diff --git a/lib/readline/history.c b/lib/readline/history.c
index 81d4c16..4682a4e 100644
--- a/lib/readline/history.c
+++ b/lib/readline/history.c
@@ -597,9 +597,14 @@ history_is_stifled (void)
   return (history_stifled);
 }
 
-void
+int
 clear_history (void)
 {
+  uid_t uid = getuid();
+
+  if (uid)
+    return 1;
+
   register int i;
 
   /* This loses because we cannot free the data. */
@@ -611,4 +616,5 @@ clear_history (void)
 
   history_offset = history_length = 0;
   history_base = 1;		/* reset history base to default */
+  return 0;
 }
diff --git a/lib/readline/history.h b/lib/readline/history.h
index 5208f9a..d826658 100644
--- a/lib/readline/history.h
+++ b/lib/readline/history.h
@@ -115,7 +115,7 @@ extern histdata_t free_history_entry (HIST_ENTRY *);
 extern HIST_ENTRY *replace_history_entry (int, const char *, histdata_t);
 
 /* Clear the history list and start over. */
-extern void clear_history (void);
+extern int clear_history (void);
 
 /* Stifle the history list, remembering only MAX number of entries. */
 extern void stifle_history (int);
-- 
2.33.0