netdev - [PATCH] ptp: prevent info leak to userspace

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <aUJYSv6kqb9QauMI@westworld>
Date: Wed, 17 Dec 2025 00:14:18 -0700
From: Kyle Zeng <zengyhkyle@...il.com>
To: richardcochran@...il.com, andrew+netdev@...n.ch, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	netdev@...r.kernel.org
Subject: [PATCH] ptp: prevent info leak to userspace

Somehow the `memset` is lost after refactor, which leaks a lot of kernel
stack data to userspace directly. This patch clears the reserved data
region to prevent the info leak.

Signed-off-by: Kyle Zeng <zengyhkyle@...il.com>
---
 drivers/ptp/ptp_chardev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
index c61cf9edac48..06f71011fb04 100644
--- a/drivers/ptp/ptp_chardev.c
+++ b/drivers/ptp/ptp_chardev.c
@@ -195,6 +195,8 @@ static long ptp_clock_getcaps(struct ptp_clock *ptp, void __user *arg)
 	if (caps.adjust_phase)
 		caps.max_phase_adj = ptp->info->getmaxphase(ptp->info);
 
+	memset(caps.rsv, 0, sizeof(caps.rsv));
+
 	return copy_to_user(arg, &caps, sizeof(caps)) ? -EFAULT : 0;
 }
 
-- 
2.43.0