linux-kernel - [PATCH 4.9 087/128] x86/mm: Stop printing BRK addresses

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Message-Id: <20200619141624.747780000@linuxfoundation.org>
Date:   Fri, 19 Jun 2020 16:33:01 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arvind Sankar <nivedita@...m.mit.edu>,
        Borislav Petkov <bp@...e.de>,
        Kees Cook <keescook@...omium.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 087/128] x86/mm: Stop printing BRK addresses

From: Arvind Sankar <nivedita@...m.mit.edu>

[ Upstream commit 67d631b7c05eff955ccff4139327f0f92a5117e5 ]

This currently leaks kernel physical addresses into userspace.

Signed-off-by: Arvind Sankar <nivedita@...m.mit.edu>
Signed-off-by: Borislav Petkov <bp@...e.de>
Acked-by: Kees Cook <keescook@...omium.org>
Acked-by: Dave Hansen <dave.hansen@...el.com>
Link: https://lkml.kernel.org/r/20200229231120.1147527-1-nivedita@alum.mit.edu
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 ce092a62fc5d..bc2455c2fcab 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -110,8 +110,6 @@ __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++) {
-- 
2.25.1