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
| ||
|
Date: Sat, 02 Jun 2007 11:00:59 +0200 From: Thierry Merle <thierry.merle@...e.fr> To: Mauro Carvalho Chehab <mchehab@...radead.org> CC: video4linux-list@...hat.com, linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, Jiri Slaby <jirislaby@...il.com> Subject: Re: [PATCH 1/1] V4L: stk11xx, add a new webcam driver Mauro Carvalho Chehab a écrit : >>> This seems to be an interesting approach. >>> >>> >>> >> Interesting but impossible to do for ioctl calls. >> When the application does a ioctl(fd_of_mnt_video0,VIDIOC_G_FMT,&arg) >> for example, there is no way for the userspace helper to catch this ioctl. >> The application could only open/read from the userspace helper's file >> /mnt/video0. >> ioctl would still have to be done on the kernel device driver. >> I thought also about a /proc interface for decompression algorithms (a >> helper would listen on a /proc file and write on another /proc file) but >> /proc is not designed for that kind of thing. >> A separate library seems to be the simplest solution. >> > > There are some ways for this to work. For example, you may create a > helper device for the daemon driver to bind, even requiring it to have > root permission. > > Right, but I am afraid that complex userspace/kernelspace context changes breaks performance. Nevertheless, I will start to specify the framework. The helper daemon would link to the v4l2-apps/lib. - 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/
Powered by blists - more mailing lists