netdev - Re: [PATCH net-next v4 2/2] net: add driver for Netronome NFP4000/NFP6000 NIC VFs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 30 Nov 2015 10:42:26 -0500 (EST)
From:	David Miller <davem@...hat.com>
To:	jakub.kicinski@...ronome.com
Cc:	netdev@...r.kernel.org, simon.horman@...ronome.com,
	rolf.neugebauer@...ronome.com
Subject: Re: [PATCH net-next v4 2/2] net: add driver for Netronome
 NFP4000/NFP6000 NIC VFs

From: Jakub Kicinski <jakub.kicinski@...ronome.com>
Date: Wed, 25 Nov 2015 15:39:04 +0000

> +config NFP_NET_DEBUG
> +	bool "Debug support for Netronome(R) NFP3200/NFP6000 NIC drivers"
> +	depends on NFP_NET || NFP_NETVF
> +	---help---
> +	  Enable extra sanity checks and debugfs support in
> +	  Netronome(R) NFP3200/NFP6000 NIC PF and VF drivers.
> +	  Note: selecting this option may adversely impact
> +		performance.
 ...
> +#ifdef CONFIG_NFP_NET_DEBUG
> +#define nn_assert(cond, fmt, args...)					\
> +	do {								\
> +		if (unlikely(!(cond))) {				\
> +			pr_err("assertion %s failed\n", #cond);		\
> +			pr_err(fmt, ## args);				\
> +			BUG();						\
> +		}							\
> +	} while (0)
> +#else
> +#define nn_assert(cond, fmt, args...)	do { } while (0)
> +#endif

This is really not appropriate.

Use WARN_ON() et al. as appropriate to assert things, and in particular
_AVOID_ BUG() in pretty much all cases and attempt to continue running
somehow with error handling paths etc.

Use of BUG() is discouraged in all except the most extreme cases where
the kernel cannot continue to execute at all.

Thanks.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html