On 09/23/2011 03:11 PM, rohan puri wrote:
On Fri, Sep 23, 2011 at 2:43 PM, Abhijit
Pawar <apawar.linux@xxxxxxxxx>
wrote:
On 09/23/2011 02:04 PM, rohan puri wrote:
On Fri, Sep 23, 2011 at 2:00
PM, Abhijit Pawar <apawar.linux@xxxxxxxxx>
wrote:
On 09/23/2011 01:01 PM, Rajat Sharma wrote:
Untidy way :
-
Yes, you can do that by registering a new
binary format handler. Whenever
exec is called, a list of registered
binary format handlers is scanned, in
the same way you can hook the
load_binary& load_library function
pointers
of the already registered binary format
handlers.
Challenge with this untidy way is to
identify the correct format, for
example if you are interested in only
hooking ELF format, there is no
special signature withing the registered
format handler to identify
that, however if one format handler
recognizes the file header, its
load_binary will return 0. This can give you
the hint that you are
sitting on top of correct file format. Long
time back I had written
the similar module in Linux to do the same,
but can't share the code
:)
-Rajat
On Thu, Sep 22, 2011 at 3:14 PM, rohan
puri<rohan.puri15@xxxxxxxxx>
wrote:
On Thu, Sep 22, 2011 at 1:53 PM, Abhijit
Pawar<apawar.linux@xxxxxxxxx>
wrote:
hi list,
Is there any way to hook the exec system
call on Linux box apart from
replacing the call in System Call table?
Regards,
Abhijit Pawar
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Tidy way : -
You can do that from LSM (Linux security
module).
Untidy way : -
Yes, you can do that by registering a new
binary format handler. Whenever
exec is called, a list of registered
binary format handlers is scanned, in
the same way you can hook the
load_binary& load_library function
pointers
of the already registered binary format
handlers.
Regards,
Rohan Puri
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Kernelnewbies mailing list
Kernelnewbies@xxxxxxxxxxxxxxxxx
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
So If I use the binary format handler, then I can
hook the exec call. however I need to register
this. Does that mean that I need to return the
negative value so as to have actual ELF handler to
be loaded?
Regards,
Abhijit Pawar
Regards,
Rohan Puri
Thanks Rohan. I tried creating a hooking module on the
similar line. I am able to load the module but whenever I am
launching any application , its load_binary is not being
called.
here is the source for the module attached.
Regards,
Abhijit Pawar
Hi Abhijit,
I have made the change, try to compile and execute this code, it
works.
Also, I am just curious enough to know that where do you need to
do this hooking.
Regards,
Rohan Puri
Hi Rohan,
I have been looking at Windows worlds ability to support DLL
Injection and API hooking. I was just wondering if this could be
something to be done in Linux as well. I am not sure if there is
any special use of this module apart from learning the binary
handler. May be it could be used as a security module for your own
binary handler.
Regards,
Abhijit Pawar
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