[PATCH 4.4 068/101] x86/mm: Stop printing BRK addresses

Greg Kroah-Hartman
2020-06-19T14:39:31Z

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

[ 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>
---
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 f00eb52c16a6..17eb564901ca 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -109,8 +109,6 @@ __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