linux-kernel - Re: How to hack syscall-table, in kernel 2.6+ ?

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

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 14 Aug 2012 13:40:20 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ajay Garg <ajaygargnsit@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: How to hack syscall-table, in kernel 2.6+ ?

> I have already tried extracting the address of the "sys_call_table"
> from "System.Map"; however, I am still not able to replace the
> function-pointers with mine.

Correct.

> Trying to do gives me page-faults, apparently meaning that the
> syscall-table memory area is read-only.

Correct.

The kernel is specifically designed to stop such uses by rootkits and
trojans and other malware.

If you are trying to patch the system call table you are doing something
wrong. What are you actually trying to achieve ?
--
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/