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Wed, 15 Nov 2017 12:25:10 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.onmicrosoft.com; s=selector1-fb-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=zOY8F6dGjleNwz44q0UUQLv4zSs8Wg/dVqbN4gC0FQs=; b=iYRNyXAy6pfXss4dpsdLBtoZyKjGKNwi+55dHomwTemN5rZbJagG//pKdq8liJhKKCwnpX+/oVI6N0M6SF5IYr6Jj2L2lM8m84oa1fMs8ArGtuqGD//ZzYel+oarSqQTF1ssjfQL975q7sANw3JzbSsTHOL4C5XBjCGAbFV3pPk= Received: from raviram-mbp.DHCP.thefacebook.com (2620:10d:c090:200::4:cd8f) by CY4PR15MB1830.namprd15.prod.outlook.com (10.174.54.15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256) id 15.20.218.12; Wed, 15 Nov 2017 17:25:08 +0000 Subject: Re: [PATCH][v3] uprobes/x86: emulate push insns for uprobe on x86 To: Oleg Nesterov CC: , , , , , , , References: <20171113221139.1516536-1-yhs@fb.com> <20171114155124.GB17667@redhat.com> <20171114160304.GA19323@redhat.com> <946788b4-e57b-c7c2-9ba8-3c6fe87c4af8@fb.com> <20171115154707.GB21275@redhat.com> <20171115170734.GA12415@redhat.com> From: Yonghong Song Message-ID: <8b85fd71-a35a-bd36-1490-cc8fd0b4dad6@fb.com> Date: Wed, 15 Nov 2017 09:25:05 -0800 User-Agent: Mozilla/5.0 (Macintosh; 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After that >> we will know whether your patch needs the additional is_64bit_mm() check in >> push_setup_xol_ops() or not. > > OK, I did the check for you. > > uprobe_init_insn() doesn't fail but insn_init(x86_64 => 0) parse it as > single-byte insn with OPCODE1 == 0x41, so push_setup_xol_ops() doesn't > need to worry about compat tasks. > > In short, your "V2" should be fine except you can factor out > auprobe->push.ilen initialization (as you did in V3). Please send V4. Thanks a lot! I am just about to use inline asm or binary rewriter to create such a code for testing... I will send V4 shortly. > > Oleg. > From 1584161255542027656@xxx Wed Nov 15 19:25:02 +0000 2017 X-GM-THRID: 1583700940287669077 X-Gmail-Labels: Inbox,Category Forums,HistoricalUnread