From: Kees Cook <keescook@chromium.org>
To: Laura Abbott <labbott@redhat.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
Balbir Singh <bsingharora@gmail.com>,
Daniel Micay <danielmicay@gmail.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Rik van Riel <riel@redhat.com>,
Casey Schaufler <casey@schaufler-ca.com>,
PaX Team <pageexec@freemail.hu>,
Brad Spengler <spender@grsecurity.net>,
Russell King <linux@armlinux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Tony Luck <tony.luck@intel.com>,
Fenghua Yu <fenghua.yu@intel.com>,
"David S. Miller" <davem@davemloft.net>,
"x86@kernel.org" <x86@kernel.org>,
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Andrew Morton <akpm@linux-foundation.org>,
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<kernel-hardening@lists.openwall.com>
Subject: [kernel-hardening] Re: [PATCH v3 02/11] mm: Hardened usercopy
Date: Tue, 19 Jul 2016 15:55:54 -0700 [thread overview]
Message-ID: <CAGXu5j+0RryPNbSeEYcn6o9zTqz4DKZV3XCuRVuus_X9oUfmww@mail.gmail.com> (raw)
In-Reply-To: <CAGXu5jJqo55G0tHzbdobEg_rjKvFONQRk7mkPq1JXOd-Hneipw@mail.gmail.com>
On Tue, Jul 19, 2016 at 12:12 PM, Kees Cook <keescook@chromium.org> wrote:
> On Mon, Jul 18, 2016 at 6:52 PM, Laura Abbott <labbott@redhat.com> wrote:
>> On 07/15/2016 02:44 PM, Kees Cook wrote:
>>> +static inline const char *check_heap_object(const void *ptr, unsigned
>>> long n,
>>> + bool to_user)
>>> +{
>>> + struct page *page, *endpage;
>>> + const void *end = ptr + n - 1;
>>> +
>>> + if (!virt_addr_valid(ptr))
>>> + return NULL;
>>> +
>>
>>
>> virt_addr_valid returns true on vmalloc addresses on arm64 which causes some
>> intermittent false positives (tab completion in a qemu buildroot environment
>> was showing it fairly reliably). I think this is an arm64 bug because
>> virt_addr_valid should return true if and only if virt_to_page returns the
>> corresponding page. We can work around this for now by explicitly
>> checking against is_vmalloc_addr.
>
> Hrm, that's weird. Sounds like a bug too, but I'll add a check for
> is_vmalloc_addr() to catch it for now.
BTW, if you were testing against -next, KASAN moved things around in
copy_*_user() in a way I wasn't expecting (__copy* and copy* now both
call __arch_copy* instead of copy* calling __copy*). I'll have this
fixed in the next version.
-Kees
--
Kees Cook
Chrome OS & Brillo Security
next prev parent reply other threads:[~2016-07-19 22:55 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-15 21:44 [kernel-hardening] [PATCH v3 00/11] mm: Hardened usercopy Kees Cook
2016-07-15 21:44 ` [kernel-hardening] [PATCH v3 01/11] mm: Implement stack frame object validation Kees Cook
2016-07-15 21:44 ` [kernel-hardening] [PATCH v3 02/11] mm: Hardened usercopy Kees Cook
2016-07-19 1:06 ` [kernel-hardening] " Laura Abbott
2016-07-19 18:48 ` Kees Cook
2016-07-19 22:00 ` [kernel-hardening] [PATCH] mm: Add is_migrate_cma_page Laura Abbott
2016-07-19 22:40 ` [kernel-hardening] " Kees Cook
2016-07-20 10:24 ` [kernel-hardening] Re: [PATCH v3 02/11] mm: Hardened usercopy Balbir Singh
2016-07-20 15:36 ` Laura Abbott
2016-07-19 1:52 ` Laura Abbott
2016-07-19 19:12 ` Kees Cook
2016-07-19 22:55 ` Kees Cook [this message]
2016-07-19 9:21 ` Christian Borntraeger
2016-07-19 19:31 ` Kees Cook
2016-07-19 20:14 ` Christian Borntraeger
2016-07-19 20:34 ` Kees Cook
2016-07-19 20:44 ` Christian Borntraeger
2016-07-21 6:52 ` Michael Ellerman
[not found] ` <5790711f.2350420a.b4287.2cc0SMTPIN_ADDED_BROKEN@mx.google.com>
2016-07-21 18:34 ` Kees Cook
2016-07-22 17:45 ` Josh Poimboeuf
2016-07-25 9:27 ` [kernel-hardening] " David Laight
2016-07-26 2:09 ` Michael Ellerman
2016-07-26 2:03 ` [kernel-hardening] " Michael Ellerman
2016-07-26 4:46 ` Kees Cook
2016-07-15 21:44 ` [kernel-hardening] [PATCH v3 03/11] x86/uaccess: Enable hardened usercopy Kees Cook
2016-07-15 21:44 ` [kernel-hardening] [PATCH v3 04/11] ARM: uaccess: " Kees Cook
2016-07-15 21:44 ` [kernel-hardening] [PATCH v3 05/11] arm64/uaccess: " Kees Cook
2016-07-15 21:44 ` [kernel-hardening] [PATCH v3 06/11] ia64/uaccess: " Kees Cook
2016-07-15 21:44 ` [kernel-hardening] [PATCH v3 07/11] powerpc/uaccess: " Kees Cook
2016-07-15 21:44 ` [kernel-hardening] [PATCH v3 08/11] sparc/uaccess: " Kees Cook
2016-07-15 21:44 ` [kernel-hardening] [PATCH v3 09/11] s390/uaccess: " Kees Cook
2016-07-15 21:44 ` [kernel-hardening] [PATCH v3 10/11] mm: SLAB hardened usercopy support Kees Cook
2016-07-15 21:44 ` [kernel-hardening] [PATCH v3 11/11] mm: SLUB " Kees Cook
2016-07-18 8:26 ` [kernel-hardening] Re: [PATCH v3 00/11] mm: Hardened usercopy Balbir Singh
2016-07-20 9:52 ` [kernel-hardening] " David Laight
2016-07-20 15:31 ` [kernel-hardening] " Kees Cook
2016-07-20 16:02 ` [kernel-hardening] " David Laight
2016-07-20 16:22 ` [kernel-hardening] " Rik van Riel
2016-07-20 17:44 ` Kees Cook
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