linux-kernel - RE: [PATCH 23/32] ACPICA: struct acpi_nfit_interleave: Replace 1-element array with flexible array

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Date:   Wed, 5 Apr 2023 17:36:58 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux ACPI <linux-acpi@...r.kernel.org>
CC:     LKML <linux-kernel@...r.kernel.org>,
        Bob Moore <robert.moore@...el.com>,
        Kees Cook <kees@...flux.net>,
        Dan Williams <dan.j.williams@...el.com>
Subject: RE: [PATCH 23/32] ACPICA: struct acpi_nfit_interleave: Replace
 1-element array with flexible array

Rafael J. Wysocki wrote:
> From: Kees Cook <kees@...flux.net>
> 
> ACPICA commit e66decc6fca36b59194b0947d87d6a9bec078bc3
> 
> Similar to "Replace one-element array with flexible-array", replace the
> 1-element array with a proper flexible array member as defined by C99.
> 
> This allows the code to operate without tripping compile-time and run-
> time bounds checkers (e.g. via __builtin_object_size(), -fsanitize=bounds,
> and/or -fstrict-flex-arrays=3).
> 
> Unlike struct acpi_nfit_flush_address and struct acpi_nfit_smbios, which
> had their sizeof() uses adjusted in code, struct acpi_nfit_interleave did
> not. This appears to have been a bug. After this change, there is a binary
> difference in acpi_dm_dump_nfit() since the size of the structure now has
> the correct size, as the prior result was including the trailing U32:
> 
> -       mov    $0x14,%ebp
> +       mov    $0x10,%ebp
> 
> Link: https://github.com/acpica/acpica/commit/e66decc6
> Signed-off-by: Bob Moore <robert.moore@...el.com>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Reviewed-by: Dan Williams <dan.j.williams@...el.com>
Tested-by: Dan Williams <dan.j.williams@...el.com>