From: Arvind Sankar <nivedita@alum.mit.edu>
Date: Sat, 29 Feb 2020 23:11:20 +0000 (-0500)
Subject: x86/mm: Stop printing BRK addresses
X-Git-Tag: v5.4.48~130
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=87ef5086a3c2a3c59af8d41833703c657cdcc406;p=users%2Fdwmw2%2Flinux.git

x86/mm: Stop printing BRK addresses

[ Upstream commit 67d631b7c05eff955ccff4139327f0f92a5117e5 ]

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
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index fd10d91a61152..af352e228fa2b 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++) {