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Date: Fri, 23 Dec 2011 10:26:15 +0100 From: richard -rw- weinberger <richard.weinberger@...il.com> To: Gaurav Saxena <grvsaxena419@...il.com> Cc: "J. R. Okajima" <hooanon05@...oo.co.jp>, linux-kernel@...r.kernel.org Subject: Re: Intercepting system calls On Fri, Dec 23, 2011 at 10:22 AM, Gaurav Saxena <grvsaxena419@...il.com> wrote: > Hello Richard > > On Fri, Dec 23, 2011 at 2:46 PM, richard -rw- weinberger > <richard.weinberger@...il.com> wrote: >> On Fri, Dec 23, 2011 at 10:08 AM, Gaurav Saxena <grvsaxena419@...il.com> wrote: >>> Ok I have seen details of KPROBES, I think it will suit to my >>> requirements, I just wanted to know a few things, >>> Can I use probes to prevent unlink of certain files? Also is >>> CONFIG_KPROBES set to "y" on linux kernels available with distros like >>> ubuntu? >> >> Kprobes allow you to instrument the kernel. >> AFAIK it enabled by most distros. > Can I use probes to return immediately ie. without execution of > original system call. For example I put a entry probe on unlink and > then on the probe return value unlink code is executed or not. Is that > possible ? > Also can I call a userspace function from kernel code? Would that be insecure ? Using Kprobes you can do nearly anything. But I would be surprised if you find a acceptable and sane solution. -- Thanks, //richard -- 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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