linux-kernel - Re: [PATCH 3/5] perf_counter: rework ioctl()s

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:	Tue, 12 May 2009 01:58:45 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 3/5] perf_counter: rework ioctl()s

On Friday 08 May 2009, Peter Zijlstra wrote:
> -#define PERF_COUNTER_IOC_ENABLE                _IO ('$', 0)
> -#define PERF_COUNTER_IOC_DISABLE       _IO ('$', 1)
> +#define PERF_COUNTER_IOC_ENABLE                _IOW('$', 0, u32)
> +#define PERF_COUNTER_IOC_DISABLE       _IOW('$', 1, u32)
>  #define PERF_COUNTER_IOC_REFRESH       _IOW('$', 2, u32)
> -#define PERF_COUNTER_IOC_RESET         _IO ('$', 3)
> +#define PERF_COUNTER_IOC_RESET         _IOW('$', 3, u32)

These ioctl definitions look malformed:
_IOW('$', 0, u32) means that the ioctl will read a u32 in user
space pointed to by (u32 __user *)arg, while what perf_ioctl
actually does is cast arg to a u32. Moreover, exported headers
should use __u32 instead of u32.

PERF_COUNTER_IOC_REFRESH apparently was broken already, this
patch also breaks the other definitions.

	Arnd <><
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/