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Message-ID: <CAGXu5jL8xBHUkZP8_MZk84Zr5efEUGL8z-o0u5_4ybX4CrAmPQ@mail.gmail.com>
Date: Tue, 23 Feb 2016 14:37:58 -0800
From: Kees Cook <keescook@...omium.org>
To: Laura Abbott <labbott@...hat.com>
Cc: Laura Abbott <labbott@...oraproject.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Arnd Bergmann <arnd@...db.de>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2] lkdtm: Add READ_AFTER_FREE test
On Tue, Feb 23, 2016 at 1:25 PM, Kees Cook <keescook@...omium.org> wrote:
> zero poison only:
> DEBUG_PAGEALLOC=n
> PAGE_POISONING=y
> PAGE_POISONING_NO_SANITY=y
> PAGE_POISONING_ZERO=y
> page_poison=on
This combo (in next-20160223) results in an unusable system. :(
[ 1.754183] random: init urandom read with 11 bits of entropy available
[ 1.768449] hostname (1171) used greatest stack depth: 11808 bytes left
[ 1.787954] BUG: Bad page map in process init pte:3d656c6f736e6f63
pmd:00020067
[ 1.789177] addr:00007f9f68200000 vm_flags:00000070 anon_vma:
(null) mapping:ffff88007c314058 index:141
[ 1.790564] file:libdl-2.19.so fault:ext4_filemap_fault
mmap:ext4_file_mmap readpage:ext4_readpage
-Kees
--
Kees Cook
Chrome OS & Brillo Security
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