From: Keith Packard <keithp@keithp.com>
To: Kees Cook <keescook@chromium.org>, linux-kernel@vger.kernel.org
Cc: Kees Cook <keescook@chromium.org>,
"Gustavo A. R. Silva" <gustavoars@kernel.org>,
Arnd Bergmann <arnd@arndb.de>, Kalle Valo <kvalo@codeaurora.org>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Nilesh Javali <njavali@marvell.com>,
Manish Rangankar <mrangankar@marvell.com>,
GR-QLogic-Storage-Upstream@marvell.com,
"James E.J. Bottomley" <jejb@linux.ibm.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Larry Finger <Larry.Finger@lwfinger.net>,
Phillip Potter <phil@philpotter.co.uk>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Florian Schilhabel <florian.c.schilhabel@googlemail.com>,
Johannes Berg <johannes@sipsolutions.net>,
Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
Fabio Aiuto <fabioaiuto83@gmail.com>,
Ross Schmidt <ross.schm.dev@gmail.com>,
Marco Cesati <marcocesati@gmail.com>,
ath10k@lists.infradead.org, linux-wireless@vger.kernel.org,
netdev@vger.kernel.org, linux-scsi@vger.kernel.org,
linux-staging@lists.linux.dev,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Dan Williams <dan.j.williams@intel.com>,
Daniel Vetter <daniel.vetter@ffwll.ch>,
clang-built-linux@googlegroups.com,
linux-hardening@vger.kernel.org
Subject: Re: [PATCH v2 3/5] treewide: Replace 0-element memcpy() destinations with flexible arrays
Date: Wed, 25 Aug 2021 22:24:18 -0700 [thread overview]
Message-ID: <87r1egpym5.fsf@keithp.com> (raw)
In-Reply-To: <20210826050458.1540622-4-keescook@chromium.org>
[-- Attachment #1.1: Type: text/plain, Size: 541 bytes --]
Kees Cook <keescook@chromium.org> writes:
> In some cases, use of the flex_array() helper is needed when a flexible
> array is part of a union.
The code below seems to show that the helper is also needed when the
flexible array is the only member of a struct? Or is this just an
extension of the 'part of a union' clause?
> @@ -160,7 +160,7 @@ struct bmi_cmd {
>
> union bmi_resp {
> struct {
> - u8 payload[0];
> + DECLARE_FLEX_ARRAY(u8, payload);
> } read_mem;
> struct {
> __le32 result;
--
-keith
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WARNING: multiple messages have this Message-ID (diff)
From: Keith Packard <keithp@keithp.com>
To: Kees Cook <keescook@chromium.org>, linux-kernel@vger.kernel.org
Cc: Kees Cook <keescook@chromium.org>,
"Gustavo A. R. Silva" <gustavoars@kernel.org>,
Arnd Bergmann <arnd@arndb.de>, Kalle Valo <kvalo@codeaurora.org>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Nilesh Javali <njavali@marvell.com>,
Manish Rangankar <mrangankar@marvell.com>,
GR-QLogic-Storage-Upstream@marvell.com,
"James E.J. Bottomley" <jejb@linux.ibm.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Larry Finger <Larry.Finger@lwfinger.net>,
Phillip Potter <phil@philpotter.co.uk>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Florian Schilhabel <florian.c.schilhabel@googlemail.com>,
Johannes Berg <johannes@sipsolutions.net>,
Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
Fabio Aiuto <fabioaiuto83@gmail.com>,
Ross Schmidt <ross.schm.dev@gmail.com>,
Marco Cesati <marcocesati@gmail.com>,
ath10k@lists.infradead.org, linux-wireless@vger.kernel.org,
netdev@vger.kernel.org, linux-scsi@vger.kernel.org,
linux-staging@lists.linux.dev,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Dan Williams <dan.j.williams@intel.com>,
Daniel Vetter <daniel.vetter@ffwll.ch>,
clang-built-linux@googlegroups.com,
linux-hardening@vger.kernel.org
Subject: Re: [PATCH v2 3/5] treewide: Replace 0-element memcpy() destinations with flexible arrays
Date: Wed, 25 Aug 2021 22:24:18 -0700 [thread overview]
Message-ID: <87r1egpym5.fsf@keithp.com> (raw)
In-Reply-To: <20210826050458.1540622-4-keescook@chromium.org>
[-- Attachment #1: Type: text/plain, Size: 541 bytes --]
Kees Cook <keescook@chromium.org> writes:
> In some cases, use of the flex_array() helper is needed when a flexible
> array is part of a union.
The code below seems to show that the helper is also needed when the
flexible array is the only member of a struct? Or is this just an
extension of the 'part of a union' clause?
> @@ -160,7 +160,7 @@ struct bmi_cmd {
>
> union bmi_resp {
> struct {
> - u8 payload[0];
> + DECLARE_FLEX_ARRAY(u8, payload);
> } read_mem;
> struct {
> __le32 result;
--
-keith
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next prev parent reply other threads:[~2021-08-26 5:24 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-26 5:04 [PATCH v2 0/5] Enable -Warray-bounds and -Wzero-length-bounds Kees Cook
2021-08-26 5:04 ` [PATCH v2 1/5] stddef: Add flexible array union helper Kees Cook
2021-08-26 5:04 ` [PATCH v2 2/5] treewide: Replace open-coded flex arrays in unions Kees Cook
2021-08-26 5:04 ` Kees Cook
2021-08-26 6:24 ` Marc Kleine-Budde
2021-08-26 6:24 ` Marc Kleine-Budde
2021-08-27 16:08 ` Kees Cook
2021-08-27 16:08 ` Kees Cook
2021-08-27 17:08 ` Marc Kleine-Budde
2021-08-27 17:08 ` Marc Kleine-Budde
2021-08-27 16:17 ` Kees Cook
2021-08-27 16:17 ` Kees Cook
2021-08-28 7:31 ` Vincent MAILHOL
2021-08-28 7:31 ` Vincent MAILHOL
2021-08-26 7:36 ` Vincent MAILHOL
2021-08-26 7:36 ` Vincent MAILHOL
2021-08-26 15:39 ` Kees Cook
2021-08-26 15:39 ` Kees Cook
2021-08-26 5:04 ` [PATCH v2 3/5] treewide: Replace 0-element memcpy() destinations with flexible arrays Kees Cook
2021-08-26 5:04 ` Kees Cook
2021-08-26 5:24 ` Keith Packard [this message]
2021-08-26 5:24 ` Keith Packard
2021-08-26 5:51 ` Kees Cook
2021-08-26 5:51 ` Kees Cook
2021-08-26 5:04 ` [PATCH v2 4/5] Makefile: Enable -Warray-bounds Kees Cook
2021-08-26 5:04 ` [PATCH v2 5/5] Makefile: Enable -Wzero-length-bounds Kees Cook
2021-08-27 9:25 ` [PATCH v2 1/5] stddef: Add flexible array union helper Vincent Mailhol
2021-08-27 15:39 ` Kees Cook
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