linux-kernel - Re: [PATCH] sched: Fix sched

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,  6 Apr 2010 16:20:51 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Anton Blanchard <anton@...ba.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	Sharyathi Nagesh <sharyath@...ibm.com>,
	Ulrich Drepper <drepper@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jack Steiner <steiner@....com>, Russ Anderson <rja@....com>,
	Mike Travis <travis@....com>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched: Fix sched_getaffinity

> 
> taskset on 2.6.34-rc3 fails on one of my ppc64 test boxes with the following
> error:
> 
> sched_getaffinity(0, 16, 0x10029650030) = -1 EINVAL (Invalid argument)
> 
> This box has 128 threads and 16 bytes is enough to cover it. Commit
> cd3d8031eb4311e516329aee03c79a08333141f1 (sched: sched_getaffinity(): Allow
> less than NR_CPUS length) is comparing this 16 bytes agains nr_cpu_ids.
> 
> Fix it by comparing nr_cpu_ids to the number of bits in the cpumask we pass in.
> 
> Signed-off-by: Anton Blanchard <anton@...ba.org>

Oops, yes yes, thanks to correct my moron ;-) 
I'll stop all todays job and will get sleeping soon.
	Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>


> ---
> 
> diff --git a/kernel/sched.c b/kernel/sched.c
> index 49d2fa7..0c1ec87 100644
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -4902,7 +4902,7 @@ SYSCALL_DEFINE3(sched_getaffinity, pid_t, pid, unsigned int, len,
>  	int ret;
>  	cpumask_var_t mask;
>  
> -	if (len < nr_cpu_ids)
> +	if ((len * BITS_PER_BYTE) < nr_cpu_ids)
>  		return -EINVAL;
>  	if (len & (sizeof(unsigned long)-1))
>  		return -EINVAL;
> --
> 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/



--
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/