Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Sat, 23 May 2020 07:41:28 -0000
From:   "tip-bot2 for Arvind Sankar" <tip-bot2@linutronix.de>
Reply-to: linux-kernel@vger.kernel.org
To:     linux-tip-commits@vger.kernel.org
Subject: [tip: x86/cleanups] x86/mm: Stop printing BRK addresses
Cc:     Arvind Sankar <nivedita@alum.mit.edu>,
        Borislav Petkov <bp@suse.de>,
        Kees Cook <keescook@chromium.org>,
        Dave Hansen <dave.hansen@intel.com>, x86 <x86@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>
In-Reply-To: <20200229231120.1147527-1-nivedita@alum.mit.edu>
References: <20200229231120.1147527-1-nivedita@alum.mit.edu>
MIME-Version: 1.0
Message-ID: <159021968859.17951.9516200260774594729.tip-bot2@tip-bot2>
Robot-ID: <tip-bot2.linutronix.de>
Robot-Unsubscribe: Contact <mailto:tglx@linutronix.de> to get blacklisted from these emails
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

The following commit has been merged into the x86/cleanups branch of tip:

Commit-ID:     67d631b7c05eff955ccff4139327f0f92a5117e5
Gitweb:        https://git.kernel.org/tip/67d631b7c05eff955ccff4139327f0f92a5117e5
Author:        Arvind Sankar <nivedita@alum.mit.edu>
AuthorDate:    Sat, 29 Feb 2020 18:11:20 -05:00
Committer:     Borislav Petkov <bp@suse.de>
CommitterDate: Sat, 23 May 2020 09:34:18 +02:00

x86/mm: Stop printing BRK addresses

This currently leaks kernel physical addresses into userspace.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Dave Hansen <dave.hansen@intel.com>
Link: https://lkml.kernel.org/r/20200229231120.1147527-1-nivedita@alum.mit.edu
---
 arch/x86/mm/init.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 1bba16c..a573a3e 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -121,8 +121,6 @@ __ref void *alloc_low_pages(unsigned int num)
 	} else {
 		pfn = pgt_buf_end;
 		pgt_buf_end += num;
-		printk(KERN_DEBUG "BRK [%#010lx, %#010lx] PGTABLE\n",
-			pfn << PAGE_SHIFT, (pgt_buf_end << PAGE_SHIFT) - 1);
 	}
 
 	for (i = 0; i < num; i++) {