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Subject[tip: x86/cleanups] x86/mm: Stop printing BRK addresses
The following commit has been merged into the x86/cleanups branch of tip:

Commit-ID: 67d631b7c05eff955ccff4139327f0f92a5117e5
Gitweb: https://git.kernel.org/tip/67d631b7c05eff955ccff4139327f0f92a5117e5
Author: Arvind Sankar <nivedita@alum.mit.edu>
AuthorDate: Sat, 29 Feb 2020 18:11:20 -05:00
Committer: Borislav Petkov <bp@suse.de>
CommitterDate: Sat, 23 May 2020 09:34:18 +02:00

x86/mm: Stop printing BRK addresses

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
---
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 1bba16c..a573a3e 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++) {
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