linux-kernel - [PATCH 8/8] sysctl: Warn on an empty procname element

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Date: Tue, 04 Jun 2024 08:29:26 +0200
From: Joel Granados via B4 Relay <devnull+j.granados.samsung.com@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
 Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>, 
 Boqun Feng <boqun.feng@...il.com>, Suren Baghdasaryan <surenb@...gle.com>, 
 Kent Overstreet <kent.overstreet@...ux.dev>, 
 Andrew Morton <akpm@...ux-foundation.org>, 
 Luis Chamberlain <mcgrof@...nel.org>, Kees Cook <keescook@...omium.org>, 
 Joel Granados <j.granados@...sung.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
 linux-fsdevel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 8/8] sysctl: Warn on an empty procname element

From: Joel Granados <j.granados@...sung.com>

Add a pr_err warning in case a ctl_table is registered with a sentinel
element containing a NULL procname.

Signed-off-by: Joel Granados <j.granados@...sung.com>
---
 fs/proc/proc_sysctl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 806700b70dea..f65098de5fcb 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -1119,6 +1119,8 @@ static int sysctl_check_table(const char *path, struct ctl_table_header *header)
 	struct ctl_table *entry;
 	int err = 0;
 	list_for_each_table_entry(entry, header) {
+		if (!entry->procname)
+			err |= sysctl_err(path, entry, "procname is null");
 		if ((entry->proc_handler == proc_dostring) ||
 		    (entry->proc_handler == proc_dobool) ||
 		    (entry->proc_handler == proc_dointvec) ||

-- 
2.43.0