linux-kernel - Re: PTRACE_{READ,WRITE}{TEXT,DATA}

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]

Message-Id: <1209445580.18023.131.camel@pasglop>
Date:	Tue, 29 Apr 2008 15:06:20 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	David Miller <davem@...emloft.net>
Cc:	roland@...hat.com, linux-kernel@...r.kernel.org, riel@...hat.com
Subject: Re: PTRACE_{READ,WRITE}{TEXT,DATA}


On Mon, 2008-04-28 at 21:34 -0700, David Miller wrote:
> From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Date: Tue, 29 Apr 2008 13:54:08 +1000
> 
> > I noticed kernel/ptrace.c has ptrace_readdata/writedata functions that
> > are only used by sparc and sparc64 which implements the ptrace requests
> > PTRACE_READ_DATA, PTRACE_WRITE_DATA (and _TEXT variants).
> > 
> > Any reason not to make everybody benefit from these and moving the sparc
> > implementation to the generic ptrace_request (&compat) ?
> > 
> > It's more efficient than read/writing one word at a time... I thought
> > about it in the light of some work Rik is doing to make
> > access_process_vm useable on video ram mappings done by the X server...
> 
> It's kind of pointless because what gdb does these days on Linux is
> use the procfs 'mem' file to directly read in parts of the inferior's
> address space.
> 
> See linux_proc_xfer_partial() in gdb/linux-nat.c=

Good point. That still uses access_process_vm() so Rik and I work
is still valid tho.

Thanks,
Ben.


--
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/