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Message-ID: <4bafdb91-307b-ff4c-5432-cf5a39dfbb8b@huawei.com>
Date: Tue, 27 Mar 2018 14:43:19 +0300
From: Igor Stoppa <igor.stoppa@...wei.com>
To: Matthew Wilcox <willy@...radead.org>
CC: <keescook@...omium.org>, <mhocko@...nel.org>, <david@...morbit.com>,
<rppt@...ux.vnet.ibm.com>, <labbott@...hat.com>,
<linux-security-module@...r.kernel.org>, <linux-mm@...ck.org>,
<linux-kernel@...r.kernel.org>, <kernel-hardening@...ts.openwall.com>,
<igor.stoppa@...il.com>
Subject: Re: [PATCH 3/6] Protectable Memory
On 27/03/18 05:31, Matthew Wilcox wrote:
> On Tue, Mar 27, 2018 at 04:55:21AM +0300, Igor Stoppa wrote:
>> +static inline void *pmalloc_array_align(struct pmalloc_pool *pool,
>> + size_t n, size_t size,
>> + short int align_order)
>> +{
>
> You're missing:
>
> if (size != 0 && n > SIZE_MAX / size)
> return NULL;
ACK
>> + return pmalloc_align(pool, n * size, align_order);
>> +}
>
>> +static inline void *pcalloc_align(struct pmalloc_pool *pool, size_t n,
>> + size_t size, short int align_order)
>> +{
>> + return pzalloc_align(pool, n * size, align_order);
>> +}
>
> Ditto.
ok
>> +static inline void *pcalloc(struct pmalloc_pool *pool, size_t n,
>> + size_t size)
>> +{
>> + return pzalloc_align(pool, n * size, PMALLOC_ALIGN_DEFAULT);
>> +}
>
> If you make this one:
>
> return pcalloc_align(pool, n, size, PMALLOC_ALIGN_DEFAULT)
ok
> then you don't need the check in this function.
>
> Also, do we really need 'align' as a parameter to the allocator functions
> rather than to the pool?
I actually wrote it first without, but then I wondered how to deal if
one needs to allocate both small fry structures and then something
larger that is page aligned.
However it's just speculation, I do not have any real example.
> I'd just reuse ARCH_KMALLOC_MINALIGN from slab.h as the alignment, and
> then add the special alignment options when we have a real user for them.
ok
--
thanks, igor
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