linux-kernel - Re: [PATCH v4 8/9] netlink: fix nla_put

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Message-Id: <20170925.201951.1512252559012166718.davem@davemloft.net>
Date:   Mon, 25 Sep 2017 20:19:51 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     arnd@...db.de
Cc:     mchehab@...nel.org, jiri@...nulli.us, arend.vanspriel@...adcom.com,
        kvalo@...eaurora.org, aryabinin@...tuozzo.com, glider@...gle.com,
        dvyukov@...gle.com, yamada.masahiro@...ionext.com, mmarek@...e.com,
        akpm@...ux-foundation.org, keescook@...omium.org,
        geert@...ux-m68k.org, gregkh@...uxfoundation.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        brcm80211-dev-list@...ress.com, kasan-dev@...glegroups.com,
        linux-kbuild@...r.kernel.org, jakub@....gnu.org,
        marxin@....gnu.org, stable@...r.kernel.org
Subject: Re: [PATCH v4 8/9] netlink: fix nla_put_{u8,u16,u32} for KASAN

From: Arnd Bergmann <arnd@...db.de>
Date: Fri, 22 Sep 2017 23:29:19 +0200

> When CONFIG_KASAN is enabled, the "--param asan-stack=1" causes rather large
> stack frames in some functions. This goes unnoticed normally because
> CONFIG_FRAME_WARN is disabled with CONFIG_KASAN by default as of commit
> 3f181b4d8652 ("lib/Kconfig.debug: disable -Wframe-larger-than warnings with
> KASAN=y").
> 
> The kernelci.org build bot however has the warning enabled and that led
> me to investigate it a little further, as every build produces these warnings:
> 
> net/wireless/nl80211.c:4389:1: warning: the frame size of 2240 bytes is larger than 2048 bytes [-Wframe-larger-than=]
> net/wireless/nl80211.c:1895:1: warning: the frame size of 3776 bytes is larger than 2048 bytes [-Wframe-larger-than=]
> net/wireless/nl80211.c:1410:1: warning: the frame size of 2208 bytes is larger than 2048 bytes [-Wframe-larger-than=]
> net/bridge/br_netlink.c:1282:1: warning: the frame size of 2544 bytes is larger than 2048 bytes [-Wframe-larger-than=]
> 
> Most of this problem is now solved in gcc-8, which can consolidate
> the stack slots for the inline function arguments. On older compilers
> we can add a workaround by declaring a local variable in each function
> to pass the inline function argument.
> 
> Cc: stable@...r.kernel.org
> Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81715
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Applied.