linux-kernel - [PATCH 4.14] atm:idt77252: Fix a kernel address leakage in idt77252

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Date:   Tue, 16 Apr 2019 14:57:27 +0800
From:   Fuqian Huang <huangfq.daxian@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     stable@...r.kernel.org, gregkh@...uxfoundation.org,
        Fuqian Huang <huangfq.daxian@...il.com>,
        Chas Williams <3chas3@...il.com>,
        linux-atm-general@...ts.sourceforge.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 4.14] atm:idt77252: Fix a kernel address leakage in idt77252

Outputting kernel addresses will reveal the locations of kernel code
and data. And there is no need to print the address of 
function idt77252_init in idt77252_init. 
This case is similar to CVE-2018-7273[1].
Just remove the print statement.

[1] https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7273

Signed-off-by: Fuqian Huang <huangfq.daxian@...il.com>
---
 drivers/atm/idt77252.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/atm/idt77252.c b/drivers/atm/idt77252.c
index 47f3c4a..76e7736 100644
--- a/drivers/atm/idt77252.c
+++ b/drivers/atm/idt77252.c
@@ -3743,8 +3743,6 @@ static int __init idt77252_init(void)
 {
 	struct sk_buff *skb;
 
-	printk("%s: at %p\n", __func__, idt77252_init);
-
 	if (sizeof(skb->cb) < sizeof(struct atm_skb_data) +
 			      sizeof(struct idt77252_skb_prv)) {
 		printk(KERN_ERR "%s: skb->cb is too small (%lu < %lu)\n",
-- 
2.11.0