From: Igor Stoppa <igor.stoppa@gmail.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: Igor Stoppa <igor.stoppa@huawei.com>,
Andy Lutomirski <luto@amacapital.net>,
Nadav Amit <nadav.amit@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
Kees Cook <keescook@chromium.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Mimi Zohar <zohar@linux.vnet.ibm.com>,
Thiago Jung Bauermann <bauerman@linux.ibm.com>,
Ahmed Soliman <ahmedsoliman@mena.vt.edu>,
linux-integrity@vger.kernel.org,
kernel-hardening@lists.openwall.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH v4 01/12] __wr_after_init: Core and default arch
Date: Tue, 12 Feb 2019 09:20:34 +0200 [thread overview]
Message-ID: <9ebd237c-c059-9219-8d11-7a708a1f80da@gmail.com> (raw)
In-Reply-To: <20190212023952.GK12668@bombadil.infradead.org>
On 12/02/2019 04:39, Matthew Wilcox wrote:
> On Tue, Feb 12, 2019 at 01:27:38AM +0200, Igor Stoppa wrote:
>> +#ifndef CONFIG_PRMEM
> [...]
>> +#else
>> +
>> +#include <linux/mm.h>
>
> It's a mistake to do conditional includes like this. That way you see
> include loops with some configs and not others. Our headers are already
> so messy, better to just include mm.h unconditionally.
>
ok
Can I still do the following, in prmem.c ?
#ifdef CONFIG_ARCH_HAS_PRMEM_HEADER
+#include <asm/prmem.h>
+#else
+
+struct wr_state {
+ struct mm_struct *prev;
+};
+
+#endif
It's still a conditional include, but it's in a C file, it shouldn't
cause any chance of loops.
The alternative is that each arch supporting prmem must have a
(probably) empty asm/prmem.h header.
I did some reasearch about telling the compiler to include a header only
if it exists, but it doesn't seem to be a gcc feature.
--
igor
next prev parent reply other threads:[~2019-02-12 7:20 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-11 23:27 [RFC PATCH v4 00/12] hardening: statically allocated protected memory Igor Stoppa
2019-02-11 23:27 ` [RFC PATCH v4 01/12] __wr_after_init: Core and default arch Igor Stoppa
2019-02-12 2:39 ` Matthew Wilcox
2019-02-12 7:20 ` Igor Stoppa [this message]
2019-02-11 23:27 ` [RFC PATCH v4 02/12] __wr_after_init: x86_64: memset_user() Igor Stoppa
2019-02-11 23:27 ` [RFC PATCH v4 03/12] __wr_after_init: x86_64: randomize mapping offset Igor Stoppa
2019-02-11 23:27 ` [RFC PATCH v4 04/12] __wr_after_init: x86_64: enable Igor Stoppa
2019-02-11 23:27 ` [RFC PATCH v4 05/12] __wr_after_init: arm64: memset_user() Igor Stoppa
2019-02-11 23:27 ` [RFC PATCH v4 06/12] __wr_after_init: arm64: enable Igor Stoppa
2019-02-11 23:27 ` [RFC PATCH v4 07/12] __wr_after_init: Documentation: self-protection Igor Stoppa
2019-02-11 23:27 ` [RFC PATCH v4 08/12] __wr_after_init: lkdtm test Igor Stoppa
2019-02-11 23:27 ` [RFC PATCH v4 09/12] __wr_after_init: rodata_test: refactor tests Igor Stoppa
2019-02-11 23:27 ` [RFC PATCH v4 10/12] __wr_after_init: rodata_test: test __wr_after_init Igor Stoppa
2019-02-11 23:27 ` [RFC PATCH v4 11/12] __wr_after_init: test write rare functionality Igor Stoppa
2019-02-11 23:27 ` [RFC PATCH v4 12/12] IMA: turn ima_policy_flags into __wr_after_init Igor Stoppa
2019-02-12 0:09 ` [RFC PATCH v4 00/12] hardening: statically allocated protected memory Kees Cook
2019-02-12 0:37 ` Igor Stoppa
2019-02-12 0:46 ` Kees Cook
2019-02-12 1:08 ` igor.stoppa
2019-02-12 1:26 ` Kees Cook
2019-02-12 7:09 ` Igor Stoppa
2019-02-12 22:39 ` Kees Cook
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