linux-hardening - Re: [PATCH][next] hfsplus: Fix out-of-bounds warnings in __hfsplus

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Date:   Tue, 30 Mar 2021 21:43:20 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] hfsplus: Fix out-of-bounds warnings in
 __hfsplus_setxattr

On Tue, 30 Mar 2021 09:52:26 -0500 "Gustavo A. R. Silva" <gustavoars@...nel.org> wrote:

> Fix the following out-of-bounds warnings by enclosing
> structure members file and finder into new struct info:
> 
> fs/hfsplus/xattr.c:300:5: warning: 'memcpy' offset [65, 80] from the object at 'entry' is out of the bounds of referenced subobject 'user_info' with type 'struct DInfo' at offset 48 [-Warray-bounds]
> fs/hfsplus/xattr.c:313:5: warning: 'memcpy' offset [65, 80] from the object at 'entry' is out of the bounds of referenced subobject 'user_info' with type 'struct FInfo' at offset 48 [-Warray-bounds]
> 
> Refactor the code by making it more "structured."
> 
> Also, this helps with the ongoing efforts to enable -Warray-bounds and
> makes the code clearer and avoid confusing the compiler.

Confused.  What was wrong with the old code?  Was this warning
legitimate and if so, why?  Or is this patch a workaround for a
compiler shortcoming?