linux-kernel - Re: [PATCH] exec: remove comparision of variable i_size of type loff_t against SIZE

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Message-ID: <20200227234055.GF23230@ZenIV.linux.org.uk>
Date:   Thu, 27 Feb 2020 23:40:55 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Scott Branden <scott.branden@...adcom.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH] exec: remove comparision of variable i_size of type
 loff_t against SIZE_MAX

On Thu, Feb 27, 2020 at 03:31:33PM -0800, Scott Branden wrote:
> Remove comparision of (i_size > SIZE_MAX).
> i_size is of type loff_t and can not be great than SIZE_MAX (~(size_t)0).

include/linux/types.h:46:typedef __kernel_loff_t                loff_t;
include/uapi/asm-generic/posix_types.h:88:typedef long long     __kernel_loff_t;

And boxen with size_t smaller than long long do exist.  Anything
32bit will qualify.  Pick any such and check that yourself...