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From: j.neuschaefer@gmx.net (Jonathan Neuschäfer)
To: kernelnewbies@lists.kernelnewbies.org
Subject: How to hook the system call?
Date: Sun, 27 Nov 2011 23:17:19 +0100	[thread overview]
Message-ID: <20111127221719.GA1522@debian.debian> (raw)
In-Reply-To: <CAAdM-RWsvJ_EQUfmx8daZbahH54FAzAm4FniGCWbKK_z8mN4TQ@mail.gmail.com>

On Wed, Nov 23, 2011 at 04:40:14PM +0800, Geraint Yang wrote:
> Hello everyone,
> 
> I am going to hook a system call like 'read' or 'send' by modifying the
> sys_call_table, but it seems that the sys_call_table is in read only page,
> how can I set modify the sys_call_table ? Or if there any method that I can
> use to hook a system call in module without modify the kernel source?

There's a kernel module for "advanced rickrolling" that overwrites the
open entry in the syscall table: https://github.com/fpletz/kernelroll

It does some trickery to make the page writable first.

HTH,
	Jonathan Neusch?fer

  parent reply	other threads:[~2011-11-27 22:17 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-11-23  8:40 How to hook the system call? Geraint Yang
2011-11-23  9:22 ` Alexandru Juncu
2011-11-23 10:10   ` Daniel Baluta
2011-11-23 10:27     ` Alexandru Juncu
2011-11-23 12:02       ` rohan puri
2011-11-23 16:50         ` Geraint Yang
2011-11-23 16:59           ` Alexandru Juncu
2011-11-23 18:05             ` Geraint Yang
2011-11-23 18:20               ` Nuno Martins
2011-11-24  4:04               ` rohan puri
2011-11-27 22:17 ` Jonathan Neuschäfer [this message]
2011-11-28  1:12   ` richard -rw- weinberger
2011-11-28  2:12     ` Geraint Yang
2011-11-28  9:48     ` Jonathan Neuschäfer

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