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Groups > linux.kernel > #1467619
| From | Arnd Bergmann <arnd@arndb.de> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v3 4/5] bug: Provide toggle for BUG on data corruption |
| Date | 2016-08-22 15:20 +0200 |
| Message-ID | <s8XiW-6LP-35@gated-at.bofh.it> (permalink) |
| References | <s7gSJ-6Zu-3@gated-at.bofh.it> <s7gSK-6Zu-19@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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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[PATCH v3 0/5] bug: Provide toggle for BUG on data corruption Kees Cook <keescook@chromium.org> - 2016-08-17 23:50 +0200
[PATCH v3 4/5] bug: Provide toggle for BUG on data corruption Kees Cook <keescook@chromium.org> - 2016-08-17 23:50 +0200
Re: [PATCH v3 4/5] bug: Provide toggle for BUG on data corruption Arnd Bergmann <arnd@arndb.de> - 2016-08-22 15:20 +0200
Re: [PATCH v3 4/5] bug: Provide toggle for BUG on data corruption "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-08-22 20:00 +0200
Re: [kernel-hardening] Re: [PATCH v3 4/5] bug: Provide toggle for BUG on data corruption Kees Cook <keescook@chromium.org> - 2016-08-23 00:40 +0200
Re: [PATCH v3 0/5] bug: Provide toggle for BUG on data corruption Steven Rostedt <rostedt@goodmis.org> - 2016-08-18 15:50 +0200
Re: [PATCH v3 0/5] bug: Provide toggle for BUG on data corruption "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-08-19 03:10 +0200
Re: [kernel-hardening] [PATCH v3 0/5] bug: Provide toggle for BUG on data corruption Rik van Riel <riel@redhat.com> - 2016-08-19 03:00 +0200
Re: [kernel-hardening] [PATCH v3 0/5] bug: Provide toggle for BUG on data corruption "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-08-19 03:30 +0200
Re: [kernel-hardening] [PATCH v3 0/5] bug: Provide toggle for BUG on data corruption Rik van Riel <riel@redhat.com> - 2016-08-19 05:00 +0200
Re: [kernel-hardening] [PATCH v3 0/5] bug: Provide toggle for BUG on data corruption "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-08-19 19:50 +0200
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