linux-kernel - Re: [PATCH v7 9/9] sparc64: Add support for ADI (Application Data Integrity)

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Message-Id: <20170905.144456.431070706382873486.davem@davemloft.net>
Date:   Tue, 05 Sep 2017 14:44:56 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     pavel@....cz
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Subject: Re: [PATCH v7 9/9] sparc64: Add support for ADI (Application Data
 Integrity)

From: Pavel Machek <pavel@....cz>
Date: Mon, 4 Sep 2017 18:25:30 +0200

> Will gcc be able to compile code that uses these automatically? That
> does not sound easy to me. Can libc automatically use this in malloc()
> to prevent accessing freed data when buffers are overrun?
> 
> Is this for benefit of JITs?

Anything that can control mappings and the virtual address used to
access memory can use ADI.

malloc() is of course one such case.  It can map memory with ADI
enabled, and return buffer addresses to malloc() callers with the
proper virtual address bits set to satisfy the ADI key checks.

And by induction anything using malloc() for it's memory allocation
gets ADI protection as well.