linux-kernel - Re: FInal kprobes rollup patches

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:	Mon, 17 Dec 2007 11:20:34 -0800
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Maneesh Soni <maneesh@...ux.vnet.ibm.com>,
	srinivasa@...ibm.com, Jim Keniston <jkenisto@...ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Masami Hiramatsu <hiramatu@....hitachi.co.jp>,
	Rusty Lynch <rusty.lynch@...el.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Keshavamurthy Anil S <anil.s.keshavamurthy@...el.com>
Subject: Re: FInal kprobes rollup patches

On Mon, 2007-12-17 at 19:52 +0530, Srikar Dronamraju wrote:
> * Ingo Molnar <mingo@...e.hu> [2007-12-15 14:12:04]:
> 
> 
> Hi Ingo, Harvey
> 
> In file include/asm-x86/kprobes_32.h
> typedef u8 kprobe_opcode_t;
> hence sizeof(kprobe_opcode_t) turns out to be 1.
> 
> Hence
> 
> memcpy(p->ainsn.insn, p->addr, MAX_INSN_SIZE * sizeof(kprobe_opcode_t));
> is correct.
> 

OK, but this would be much clearer to adopt the X86_64 way, define
MAX_INSN_SIZE one smaller and make this line:

/* Copy original instruction plus space for 1 byte relative jump */
memcpy(p->ainsn.insn, p->addr, MAX_INSN_SIZE + sizeof(kprobe_opcode_t));

See the first patch of my cleanup work that unified MAX_INSN_SIZE
and you'll see why this jumped out.

Harvey

--
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/