Commit 67d631b7 authored Feb 29, 2020 by Arvind Sankar Committed by Borislav Petkov May 23, 2020

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

parent 0e5e3d44

arch/x86/mm/init.c

+0 −2

Original line number	Diff line number	Diff line
		@@ -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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