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Message-Id: <20200229231120.1147527-1-nivedita@alum.mit.edu>
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
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