linux-kernel - Re: [PATCH v4 13/16] cxl: Driver code for powernv PCIe based cards for userspace access

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:	Wed, 08 Oct 2014 21:28:05 +1100
From:	Ian Munsie <imunsie@....ibm.com>
To:	Michael Neuling <mikey@...ling.org>
Cc:	greg <greg@...ah.com>, arnd <arnd@...db.de>,
	mpe <mpe@...erman.id.au>, benh <benh@...nel.crashing.org>,
	anton <anton@...ba.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linuxppc-dev <linuxppc-dev@...abs.org>, jk <jk@...abs.org>,
	cbe-oss-dev <cbe-oss-dev@...ts.ozlabs.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH v4 13/16] cxl: Driver code for powernv PCIe based cards for userspace access

Excerpts from Michael Neuling's message of 2014-10-08 19:55:02 +1100:
> +static ssize_t afu_read(struct file *file, char __user *buf, size_t count,
> +            loff_t *off)
...
> +    for (;;) {
> +        prepare_to_wait(&ctx->wq, &wait, TASK_INTERRUPTIBLE);
> +        if (ctx_event_pending(ctx))
> +            break;
> +
> +        spin_unlock_irqrestore(&ctx->lock, flags);
> +        if (file->f_flags & O_NONBLOCK)
> +            return -EAGAIN;
> +
> +        if (signal_pending(current))
> +            return -ERESTARTSYS;

Looks like I mucked this up while refactoring - these two cases no
longer call finish_wait() which can lead to a crash if something later
wakes up the ctx->wq... I'll post a fix in a separate patch shortly.

-Ian

--
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/