[PATCH 5.4 130/261] x86/mm: Stop printing BRK addresses

From: Greg Kroah-Hartman
Date: Fri Jun 19 2020 - 12:04:38 EST


From: Arvind Sankar <nivedita@xxxxxxxxxxxx>

[ Upstream commit 67d631b7c05eff955ccff4139327f0f92a5117e5 ]

This currently leaks kernel physical addresses into userspace.

Signed-off-by: Arvind Sankar <nivedita@xxxxxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>
Acked-by: Dave Hansen <dave.hansen@xxxxxxxxx>
Link: https://lkml.kernel.org/r/20200229231120.1147527-1-nivedita@xxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 fd10d91a6115..af352e228fa2 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++) {
--
2.25.1