linux-kernel - [PATCH] x86/mm/init: Stop printing pgt

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Date:   Sat, 29 Feb 2020 18:11:20 -0500
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     "Tobin C . Harding" <me@...in.cc>, Tycho Andersen <tycho@...ho.ws>
Cc:     kernel-hardening@...ts.openwall.com,
        Kees Cook <keescook@...omium.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] x86/mm/init: Stop printing pgt_buf addresses

This currently leaks kernel physical addresses into userspace.

Signed-off-by: Arvind Sankar <nivedita@...m.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 e7bb483557c9..dc4711f09cdc 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++) {
-- 
2.24.1