From: Joe Perches <joe@perches.com>
To: Kees Cook <keescook@chromium.org>,
"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Laura Abbott <labbott@redhat.com>,
Steven Rostedt <rostedt@goodmis.org>,
Stephen Boyd <sboyd@codeaurora.org>,
Daniel Micay <danielmicay@gmail.com>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Josh Triplett <josh@joshtriplett.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Lai Jiangshan <jiangshanlai@gmail.com>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Dan Williams <dan.j.williams@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>, Josef Bacik <jbacik@fb.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Tejun Heo <tj@kernel.org>,
Nikolay Aleksandrov <nikolay@cumulusnetworks.com>,
Dmitry Vyukov <dvyukov@google.com>,
linux-kernel@vger.kernel.org,
kernel-hardening@lists.openwall.com
Subject: Re: [PATCH v2 4/5] bug: Provide toggle for BUG on data corruption
Date: Tue, 16 Aug 2016 17:26:09 -0700 [thread overview]
Message-ID: <1471393569.4075.187.camel@perches.com> (raw)
In-Reply-To: <1471393229-27182-5-git-send-email-keescook@chromium.org>
On Tue, 2016-08-16 at 17:20 -0700, Kees Cook wrote:
> The kernel checks for cases of data structure corruption under some
> CONFIGs (e.g. CONFIG_DEBUG_LIST). When corruption is detected, some
> systems may want to BUG() immediately instead of letting the system run
> with known corruption. Usually these kinds of manipulation primitives can
> be used by security flaws to gain arbitrary memory write control. This
> provides a new config CONFIG_BUG_ON_DATA_CORRUPTION and a corresponding
> macro CHECK_DATA_CORRUPTION for handling these situations. Notably, even
> if not BUGing, the kernel should not continue processing the corrupted
> structure.
[]
> diff --git a/include/linux/bug.h b/include/linux/bug.h
[]
> @@ -118,4 +118,21 @@ static inline enum bug_trap_type report_bug(unsigned long bug_addr,
> }
>
> #endif /* CONFIG_GENERIC_BUG */
> +
> +/*
> + * 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, format...) \
My preference would be to use (condition, fmt, ...)
> + do { \
> + if (unlikely(condition)) { \
> + if (IS_ENABLED(CONFIG_BUG_ON_DATA_CORRUPTION)) { \
> + printk(KERN_ERR format); \
and
pr_err(fmt, ##__VA_ARGS__);
so that any use would also get any local pr_fmt applied as well.
> + BUG(); \
> + } else \
> + WARN(1, format); \
> + return false; \
> + } \
> + } while (0)
> +
> #endif /* _LINUX_BUG_H */
next prev parent reply other threads:[~2016-08-17 0:26 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-17 0:20 [PATCH v2 0/5] bug: Provide toggle for BUG on data corruption Kees Cook
2016-08-17 0:20 ` [PATCH v2 1/5] list: Split list_add() debug checking into separate function Kees Cook
2016-08-17 13:16 ` Steven Rostedt
2016-08-17 0:20 ` [PATCH v2 2/5] rculist: Consolidate DEBUG_LIST for list_add_rcu() Kees Cook
2016-08-17 0:20 ` [PATCH v2 3/5] list: Split list_del() debug checking into separate function Kees Cook
2016-08-17 0:20 ` [PATCH v2 4/5] bug: Provide toggle for BUG on data corruption Kees Cook
2016-08-17 0:26 ` Joe Perches [this message]
2016-08-17 3:39 ` Kees Cook
2016-08-17 13:20 ` Steven Rostedt
2016-08-17 0:20 ` [PATCH v2 5/5] lkdtm: Add tests for struct list corruption Kees Cook
2016-08-17 0:55 ` [PATCH v2 0/5] bug: Provide toggle for BUG on data corruption Henrique de Moraes Holschuh
2016-08-17 3:37 ` Kees Cook
2016-08-17 20:17 ` Stephen Boyd
2016-08-17 21:11 ` Kees Cook
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