linux-kernel - Re: [PATCH] infiniband: avoid overflow warning

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Date:   Fri, 18 Aug 2017 12:40:05 -0400
From:   Doug Ledford <dledford@...hat.com>
To:     Arnd Bergmann <arnd@...db.de>, Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>
Cc:     Daniel Micay <danielmicay@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Moni Shoua <monis@...lanox.com>,
        "Kalderon, Michal" <Michal.Kalderon@...ium.com>,
        Ariel Elior <Ariel.Elior@...ium.com>,
        "David S. Miller" <davem@...emloft.net>,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Parav Pandit <parav@...lanox.com>,
        Noa Osherovich <noaos@...lanox.com>,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] infiniband: avoid overflow warning

On Mon, 2017-07-31 at 08:50 +0200, Arnd Bergmann wrote:
> A sockaddr_in structure on the stack getting passed into rdma_ip2gid
> triggers this warning, since we memcpy into a larger sockaddr_in6
> structure:
> 
> In function 'memcpy',
>     inlined from 'rdma_ip2gid' at include/rdma/ib_addr.h:175:3,
>     inlined from 'addr_event.isra.4.constprop' at
> drivers/infiniband/core/roce_gid_mgmt.c:693:2,
>     inlined from 'inetaddr_event' at
> drivers/infiniband/core/roce_gid_mgmt.c:716:9:
> include/linux/string.h:305:4: error: call to '__read_overflow2'
> declared with attribute error: detected read beyond size of object
> passed as 2nd parameter
> 
> The warning seems appropriate here, but the code is also clearly
> correct, so we really just want to shut up this instance of the
> output.
> 
> The best way I found so far is to avoid the memcpy() call and instead
> replace it with a struct assignment.
> 
> Fixes: 6974f0c4555e ("include/linux/string.h: add the option of
> fortified string.h functions")
> Cc: Daniel Micay <danielmicay@...il.com>
> Cc: Kees Cook <keescook@...omium.org>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks, applied.

-- 
Doug Ledford <dledford@...hat.com>
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