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Date: Mon, 22 Aug 2016 15:15:35 +0200
From: Arnd Bergmann <arnd@...db.de>
To: Kees Cook <keescook@...omium.org>
Cc: "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>, Laura Abbott <labbott@...hat.com>, Steven Rostedt <rostedt@...dmis.org>, Daniel Micay <danielmicay@...il.com>, Joe Perches <joe@...ches.com>, Stephen Boyd <sboyd@...eaurora.org>, Syed Rameez Mustafa <rameezmustafa@...eaurora.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Josh Triplett <josh@...htriplett.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Lai Jiangshan <jiangshanlai@...il.com>, "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, Michael Ellerman <mpe@...erman.id.au>, Andrew Morton <akpm@...ux-foundation.org>, Dan Williams <dan.j.williams@...el.com>, Jan Kara <jack@...e.cz>, Thomas Gleixner <tglx@...utronix.de>, Josef Bacik <jbacik@...com>, Ingo Molnar <mingo@...nel.org>, Tejun Heo <tj@...nel.org>, Andrey Ryabinin <aryabinin@...tuozzo.com>, Nikolay Aleksandrov <nikolay@...ulusnetworks.com>, Dmitry Vyukov <dvyukov@...gle.com>, linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH v3 4/5] bug: Provide toggle for BUG on data corruption
On Wednesday, August 17, 2016 2:42:11 PM CEST Kees Cook wrote:
> +
> +/*
> + * Since detected data corruption should stop operation on the affected
> + * structures, this returns false if the corruption condition is found.
> + */
> +#define CHECK_DATA_CORRUPTION(condition, fmt, ...) \
> + do { \
> + if (unlikely(condition)) { \
> + if (IS_ENABLED(CONFIG_BUG_ON_DATA_CORRUPTION)) { \
> + pr_err(fmt, ##__VA_ARGS__); \
> + BUG(); \
> + } else \
> + WARN(1, fmt, ##__VA_ARGS__); \
> + return false; \
> + } \
> + } while (0)
> +
I think the "return false" inside of the macro makes it easy to misread
what is actually going on.
How about making it a macro that returns the condition argument?
#define CHECK_DATA_CORRUPTION(condition, fmt, ...) \
({ \
bool _condition = unlikely(condition); \
if (_condition) { \
...
} \
_condition; \
})
Arnd
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