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


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