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Date: 04 Jun 2007 22:57:34 +0200 From: Andi Kleen <andi@...stfloor.org> To: Jeff Dike <jdike@...toit.com> Cc: Zach Brown <zach.brown@...cle.com>, Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org> Subject: Re: Syslets, signals, and security Jeff Dike <jdike@...toit.com> writes: > How about splitting the credentials out of the task_struct and making > them sharable ala ->mm et al? You change uid there and it changes for > everyone. It will make fork slightly more expensive though. Strictly that's required by POSIX anyways. But it's a real mess. The problem is that you would need to reference count/lock them in every syscall or ioctl or similar. Otherwise another thread could change them in the middle of a syscall which wouldn't be good. Doing this full reference counting would be probably somewhat expensive with more locked cycles and also a lot of work to implement. You would need to audit large parts of the source tree. I don't think it's a good idea. -Andi - 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/
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