From: Christopher Lameter <cl@linux.com> To: Thomas Garnier <thgarnie@chromium.org> Cc: Kernel Hardening <kernel-hardening@lists.openwall.com>, Kristen Carlson Accardi <kristen@linux.intel.com>, Andy Lutomirski <luto@kernel.org>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, "H. Peter Anvin" <hpa@zytor.com>, the arch/x86 maintainers <x86@kernel.org>, Dennis Zhou <dennis@kernel.org>, Tejun Heo <tj@kernel.org>, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Juergen Gross <jgross@suse.com>, Stefano Stabellini <sstabellini@kernel.org>, Andrew Morton <akpm@linux-foundation.org>, Andi Kleen <ak@linux.intel.com>, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, Michal Hocko <mhocko@suse.com>, Mike Rapoport <rppt@linux.vnet.ibm.com>, Stephen Rothwell <sfr@canb.auug.org.au>, Cao jin <caoj.fnst@cn.fujitsu.com>, Brijesh Singh <brijesh.singh@amd.com>, Masahiro Yamada <yamada.masahiro@socionext.com>, Joerg Roedel <jroedel@suse.de>, Peter Zijlstra <peterz@infradead.org>, Kees Cook <keescook@chromium.org>, Mathieu Desnoyers <mathieu.desnoyers@efficios.com>, LKML <linux-kernel@vger.kernel.org>, xen-devel <xen-devel@lists.xenproject.org> Subject: Re: [PATCH v6 14/27] x86/percpu: Adapt percpu for PIE support Date: Mon, 8 Apr 2019 17:56:20 +0000 [thread overview] Message-ID: <01000169fe18026e-a0951268-516c-4604-a4c3-140f3cbb6f7a-000000@email.amazonses.com> (raw) In-Reply-To: <CAJcbSZETNhr=Pv+0daEWUsD2=qnZxT9rbmFaE+y7ag-xKOs89w@mail.gmail.com> On Mon, 8 Apr 2019, Thomas Garnier wrote: > > It didn't work originally but I will revisit to see if I missed something. > > I revisited and couldn't find a way to prevent relocations to the > percpu section. Without PIE, you can reference absolute address which > was convenient for percpu. Can you switch PIE off for the percpu section? If not maybe the linker needs to have an additional option? Cannot imagine that this is not possible. You neeed to be able to reference registers that are in fixed memory locations. > Christopher: Did you have something specific in mind? I thought that we just leave it as is.
WARNING: multiple messages have this Message-ID (diff)
From: Christopher Lameter <cl@linux.com> To: Thomas Garnier <thgarnie@chromium.org> Cc: Michal Hocko <mhocko@suse.com>, Brijesh Singh <brijesh.singh@amd.com>, Kernel Hardening <kernel-hardening@lists.openwall.com>, Peter Zijlstra <peterz@infradead.org>, Masahiro Yamada <yamada.masahiro@socionext.com>, Kristen Carlson Accardi <kristen@linux.intel.com>, "H. Peter Anvin" <hpa@zytor.com>, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Stephen Rothwell <sfr@canb.auug.org.au>, Stefano Stabellini <sstabellini@kernel.org>, the arch/x86 maintainers <x86@kernel.org>, Ingo Molnar <mingo@redhat.com>, Dennis Zhou <dennis@kernel.org>, Joerg Roedel <jroedel@suse.de>, Kees Cook <keescook@chromium.org>, Cao jin <caoj.fnst@cn.fujitsu.com>, Mike Rapoport <rppt@linux.vnet.ibm.com>, Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>, xen-devel <xen-devel@lists.xenproject.org>, Thomas Gleixner <tglx@linutronix.de>, Juergen Gross <jgross@suse.com>, LKML <linux-kernel@vger.kernel.org>, Andi Kleen <ak@linux.intel.com>, Tejun Heo <tj@kernel.org>, Mathieu Desnoyers <mathieu.desnoyers@efficios.com>, Andrew Morton <akpm@linux-foundation.org>, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Subject: Re: [Xen-devel] [PATCH v6 14/27] x86/percpu: Adapt percpu for PIE support Date: Mon, 8 Apr 2019 17:56:20 +0000 [thread overview] Message-ID: <01000169fe18026e-a0951268-516c-4604-a4c3-140f3cbb6f7a-000000@email.amazonses.com> (raw) In-Reply-To: <CAJcbSZETNhr=Pv+0daEWUsD2=qnZxT9rbmFaE+y7ag-xKOs89w@mail.gmail.com> On Mon, 8 Apr 2019, Thomas Garnier wrote: > > It didn't work originally but I will revisit to see if I missed something. > > I revisited and couldn't find a way to prevent relocations to the > percpu section. Without PIE, you can reference absolute address which > was convenient for percpu. Can you switch PIE off for the percpu section? If not maybe the linker needs to have an additional option? Cannot imagine that this is not possible. You neeed to be able to reference registers that are in fixed memory locations. > Christopher: Did you have something specific in mind? I thought that we just leave it as is. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
next prev parent reply other threads:[~2019-04-08 17:56 UTC|newest] Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-01-31 19:24 [PATCH v6 00/27] x86: PIE support and option to extend KASLR randomization Thomas Garnier 2019-01-31 19:24 ` Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 01/27] x86/crypto: Adapt assembly for PIE support Thomas Garnier 2019-02-07 11:48 ` Borislav Petkov 2019-02-07 17:01 ` Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 02/27] x86: Use symbol name in jump table " Thomas Garnier 2019-02-07 12:17 ` Borislav Petkov 2019-02-07 17:04 ` Thomas Garnier 2019-02-07 17:11 ` Borislav Petkov 2019-02-07 23:55 ` Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 03/27] x86: Add macro to get symbol address " Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 04/27] x86: relocate_kernel - Adapt assembly " Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 05/27] x86/entry/64: " Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 06/27] x86: pm-trace - " Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 07/27] x86/CPU: " Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 08/27] x86/acpi: " Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 09/27] x86/boot/64: " Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 10/27] x86/power/64: " Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 11/27] x86/paravirt: " Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 12/27] x86/alternatives: " Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 13/27] x86/boot/64: Build head64.c as mcmodel large when PIE is enabled Thomas Garnier 2019-02-01 11:15 ` Kirill A. Shutemov 2019-02-01 17:11 ` Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 14/27] x86/percpu: Adapt percpu for PIE support Thomas Garnier 2019-01-31 20:57 ` Christopher Lameter 2019-01-31 22:49 ` Thomas Garnier 2019-01-31 22:49 ` Thomas Garnier 2019-02-01 2:31 ` Christopher Lameter 2019-02-01 17:13 ` Thomas Garnier 2019-04-08 15:58 ` Thomas Garnier 2019-04-08 15:58 ` [Xen-devel] " Thomas Garnier 2019-04-08 17:56 ` Christopher Lameter [this message] 2019-04-08 17:56 ` Christopher Lameter 2019-04-08 18:08 ` Thomas Garnier 2019-04-08 18:08 ` [Xen-devel] " Thomas Garnier 2019-04-08 18:08 ` Thomas Garnier 2019-04-08 17:56 ` Christopher Lameter 2019-04-08 15:58 ` Thomas Garnier 2019-02-01 17:13 ` Thomas Garnier 2019-02-01 2:31 ` Christopher Lameter 2019-01-31 20:57 ` Christopher Lameter 2019-01-31 19:24 ` Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 15/27] compiler: Option to default to hidden symbols Thomas Garnier 2019-01-31 19:24 ` Thomas Garnier 2019-02-01 7:12 ` Dan Carpenter 2019-02-01 7:12 ` Dan Carpenter 2019-02-01 17:00 ` Thomas Garnier 2019-02-01 17:00 ` Thomas Garnier 2019-02-01 8:22 ` Adrian Hunter 2019-02-01 8:22 ` Adrian Hunter 2019-02-01 17:35 ` Thomas Garnier 2019-02-01 17:35 ` Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 16/27] compiler: Option to add PROVIDE_HIDDEN replacement for weak symbols Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 17/27] x86/relocs: Handle PIE relocations Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 18/27] xen: Adapt assembly for PIE support Thomas Garnier 2019-01-31 19:24 ` Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 19/27] kvm: " Thomas Garnier 2019-02-06 19:56 ` Sean Christopherson 2019-02-06 21:23 ` Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 20/27] x86: Support global stack cookie Thomas Garnier 2019-02-01 19:27 ` Andy Lutomirski 2019-02-01 20:21 ` Thomas Garnier 2019-02-01 22:36 ` Andy Lutomirski 2019-02-01 23:56 ` Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 21/27] x86/ftrace: Adapt function tracing for PIE support Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 22/27] x86/modules: Add option to start module section after kernel Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 23/27] x86/modules: Adapt module loading for PIE support Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 24/27] x86/mm: Make the x86 GOT read-only Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 25/27] x86/pie: Add option to build the kernel as PIE Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 26/27] x86/relocs: Add option to generate 64-bit relocations Thomas Garnier 2019-01-31 19:24 ` [PATCH v6 27/27] x86/kaslr: Add option to extend KASLR range from 1GB to 3GB Thomas Garnier 2019-01-31 19:59 ` [PATCH v6 00/27] x86: PIE support and option to extend KASLR randomization Kees Cook 2019-01-31 19:59 ` Kees Cook 2019-01-31 19:59 ` Kees Cook 2019-01-31 19:59 ` Kees Cook 2019-01-31 21:40 ` Konrad Rzeszutek Wilk 2019-01-31 21:40 ` Konrad Rzeszutek Wilk 2019-01-31 21:40 ` Konrad Rzeszutek Wilk 2019-01-31 22:42 ` Thomas Garnier 2019-01-31 22:42 ` Thomas Garnier 2019-01-31 22:42 ` Thomas Garnier 2019-01-31 21:40 ` Konrad Rzeszutek Wilk
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