linux-hardening - Re: [PATCH v2] scsi: advansys: Prefer struct

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Message-ID: <yq17df0gkfw.fsf@ca-mkp.ca.oracle.com>
Date:   Tue, 28 Sep 2021 22:55:12 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Len Baker <len.baker@....com>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Hannes Reinecke <hare@...e.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        linux-hardening@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] scsi: advansys: Prefer struct_size over open coded
 arithmetic


Len,

> As noted in the "Deprecated Interfaces, Language Features, Attributes,
> and Conventions" documentation [1], size calculations (especially
> multiplication) should not be performed in memory allocator (or
> similar) function arguments due to the risk of them overflowing. This
> could lead to values wrapping around and a smaller allocation being
> made than the caller was expecting. Using those allocations could lead
> to linear overflows of heap memory and other misbehaviors.

Applied to 5.16/scsi-staging, thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering