From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: ARC-Seal: i=1; a=rsa-sha256; t=1522262905; cv=none; d=google.com; s=arc-20160816; b=MKXu7TGmqf/Qh+Lyjf9N7OiGMTy9YbeC8FfUirntf8O7pVxxAic+2H9GrnxA/WMsEe CFloeIvXtrbZ+05ArzCu5+iQBWF61AL7ZwPwirZGaW78JLLbi6nOFCZV4dkuilQcCM8m 0VhQMGFAejfX79Pfb6u6S0v/eUab5UCsoJXVm7Z2J9iJN9DXtYlza7Oa9GtgG4pmshG1 8iTOahYEFbRTY9X9prmMcMXYpbUTmf5zOWcIJ7WNJRZ0ytIJSy4WRBJmzFFmGVkOR3Df w/RgF7slc/lqwvws1ViY8wfxJhbOKIs04Kqam09onatVnBmxdX+IUE+QMcjGLFNkIYwr eDog== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=to:references:message-id:content-transfer-encoding:cc:date :in-reply-to:from:subject:mime-version:dkim-signature :arc-authentication-results; bh=f+re0HW/85NsVu/LcchDagF2oAbLnTK285vXqWgR0wo=; b=f0WgZyOECzTcbacho8mb1qISgA0/RXMljqyfwvUoCyohUVYXtWmGtbg69/SoKbjWCM LPEQLlGuQR+ugtr6Vw0HPKzfPQTY7vbj/F8FrYWIxR4QwPpEUN3XzUqpU7hHrppxaT2M qNmVxtUvW2VkLXk4ZT6PjNDPOXdPi0UiRSdlIGf+CRyBnXa6kDY2teoprJfM3fXAVhW2 boYatYPtz73AVALSIMlynwBGudplL7leQ3O0V2nU8/Ad0AYHoBI/EQdm3ZZlbIqFpMEO hnEMhqfEO/WzHrFvD+S+dU+EfvhOxFEbUP6hbVNnbaMtsVVCq2Kccc7/GmKBFRRKYRaL 3NvA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=CD1wumWZ; spf=pass (google.com: domain of blackzert@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=blackzert@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=CD1wumWZ; spf=pass (google.com: domain of blackzert@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=blackzert@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com X-Google-Smtp-Source: AIpwx4+dwqVh1nEI930koA5Dbyw10gOxThstZ0P3Ms8fC+CWW2blWEE7IBEbV7AOxZv1966jnFaIUg== Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.2 \(3445.5.20\)) Subject: Re: [RFC PATCH v2 0/2] Randomization of address chosen by mmap. From: Ilya Smith In-Reply-To: <20180327221635.GA3790@thunk.org> Date: Wed, 28 Mar 2018 21:48:22 +0300 Cc: Michal Hocko , Matthew Wilcox , rth@twiddle.net, ink@jurassic.park.msu.ru, mattst88@gmail.com, vgupta@synopsys.com, linux@armlinux.org.uk, tony.luck@intel.com, fenghua.yu@intel.com, ralf@linux-mips.org, jejb@parisc-linux.org, Helge Deller , benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, ysato@users.sourceforge.jp, dalias@libc.org, davem@davemloft.net, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, nyc@holomorphy.com, viro@zeniv.linux.org.uk, arnd@arndb.de, gregkh@linuxfoundation.org, deepa.kernel@gmail.com, Hugh Dickins , kstewart@linuxfoundation.org, pombredanne@nexb.com, Andrew Morton , steve.capper@arm.com, punit.agrawal@arm.com, aneesh.kumar@linux.vnet.ibm.com, npiggin@gmail.com, Kees Cook , bhsharma@redhat.com, riel@redhat.com, nitin.m.gupta@oracle.com, "Kirill A. Shutemov" , Dan Williams , Jan Kara , ross.zwisler@linux.intel.com, Jerome Glisse , Andrea Arcangeli , Oleg Nesterov , linux-alpha@vger.kernel.org, LKML , linux-snps-arc@lists.infradead.org, linux-ia64@vger.kernel.org, linux-metag@vger.kernel.org, linux-mips@linux-mips.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, Linux-MM Content-Transfer-Encoding: quoted-printable Message-Id: References: <1521736598-12812-1-git-send-email-blackzert@gmail.com> <20180323124806.GA5624@bombadil.infradead.org> <651E0DB6-4507-4DA1-AD46-9C26ED9792A8@gmail.com> <20180326084650.GC5652@dhcp22.suse.cz> <01A133F4-27DF-4AE2-80D6-B0368BF758CD@gmail.com> <20180327072432.GY5652@dhcp22.suse.cz> <0549F29C-12FC-4401-9E85-A430BC11DA78@gmail.com> <20180327221635.GA3790@thunk.org> To: "Theodore Y. Ts'o" X-Mailer: Apple Mail (2.3445.5.20) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1595656488556903336?= X-GMAIL-MSGID: =?utf-8?q?1596208347872056587?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: > On 28 Mar 2018, at 01:16, Theodore Y. Ts'o wrote: >=20 > On Tue, Mar 27, 2018 at 04:51:08PM +0300, Ilya Smith wrote: >>> /dev/[u]random is not sufficient? >>=20 >> Using /dev/[u]random makes 3 syscalls - open, read, close. This is a = performance >> issue. >=20 > You may want to take a look at the getrandom(2) system call, which is > the recommended way getting secure random numbers from the kernel. >=20 >>> Well, I am pretty sure userspace can implement proper free ranges >>> tracking=E2=80=A6 >>=20 >> I think we need to know what libc developers will say on implementing = ASLR in=20 >> user-mode. I am pretty sure they will say =E2=80=98nether=E2=80=99 or = =E2=80=98some-day=E2=80=99. And problem=20 >> of ASLR will stay forever. >=20 > Why can't you send patches to the libc developers? >=20 > Regards, >=20 > - Ted I still believe the issue is on kernel side, not in library. Best regards, Ilya