On Mon, Apr 8, 2019 at 10:56 AM Christopher Lameter wrote:
>
> 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
&
On Fri, Feb 1, 2019 at 9:13 AM Thomas Garnier wrote:
>
> On Thu, Jan 31, 2019 at 6:31 PM Christopher Lameter wrote:
> >
> > On Thu, 31 Jan 2019, Thomas Garnier wrote:
> >
> > > The per-cpu symbols are in a section that is zero based to create
> > &
On Thu, Jan 31, 2019 at 6:31 PM Christopher Lameter wrote:
>
> On Thu, 31 Jan 2019, Thomas Garnier wrote:
>
> > The per-cpu symbols are in a section that is zero based to create
> > offsets. The compiler doesn't see them as offsets but as relative
> > symbol and
On Thu, Jan 31, 2019 at 1:41 PM Konrad Rzeszutek Wilk
wrote:
>
> On Thu, Jan 31, 2019 at 11:24:07AM -0800, Thomas Garnier wrote:
> > There has been no major concern in the latest iterations. I am interested on
> > what would be the best way to slowly integrate this patchset
On Thu, Jan 31, 2019 at 12:57 PM Christopher Lameter wrote:
>
> On Thu, 31 Jan 2019, Thomas Garnier wrote:
>
> > Perpcu uses a clever design where the .percu ELF section has a virtual
> > address of zero and the custom linux relocation code avoid relocating
> > specific
There has been no major concern in the latest iterations. I am interested on
what would be the best way to slowly integrate this patchset upstream.
Changes:
- patch v6:
- Rebase on latest changes in jump tables and crypto.
- Fix wording on couple commits.
- Revisit checkpatch warnings.
.
Signed-off-by: Thomas Garnier
Reviewed-by: Juergen Gross
---
arch/x86/platform/pvh/head.S | 14 ++
arch/x86/tools/relocs.c | 16 +++-
arch/x86/xen/xen-head.S | 11 ++-
3 files changed, 31 insertions(+), 10 deletions(-)
diff --git a/arch/x86/platform/pvh
Independent Executable (PIE) support will allow to extend the
KASLR randomization range below 0x8000.
Signed-off-by: Thomas Garnier
---
arch/x86/entry/calling.h | 2 +-
arch/x86/entry/entry_64.S| 4 ++--
arch/x86/include/asm/percpu.h| 25 +++--
arch
Independent Executable (PIE) support will allow to extend the
KASLR randomization range 0x8000.
Signed-off-by: Thomas Garnier
---
arch/x86/entry/calling.h | 2 +-
arch/x86/entry/entry_64.S| 4 ++--
arch/x86/include/asm/percpu.h| 25 +++--
arch/x86
-by: Thomas Garnier
Reviewed-by: Juergen Gross
---
arch/x86/tools/relocs.c | 16 +++-
arch/x86/xen/xen-head.S | 11 ++-
arch/x86/xen/xen-pvh.S | 14 ++
3 files changed, 31 insertions(+), 10 deletions(-)
diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools
Changes:
- patch v5:
- Adapt new crypto modules for PIE.
- Improve per-cpu commit message.
- Fix xen 32-bit build error with .quad.
- Remove extra code for ftrace.
- patch v4:
- Simplify early boot by removing global variables.
- Modify the mcount location script for
On Fri, Jun 1, 2018 at 8:40 AM Boris Ostrovsky
wrote:
>
> On 05/29/2018 06:15 PM, Thomas Garnier wrote:
> > diff --git a/arch/x86/xen/xen-pvh.S b/arch/x86/xen/xen-pvh.S
> > index ca2d3b2bf2af..82ba89ba8bb3 100644
> > --- a/arch/x86/xen/xen-pvh.S
> > +++ b/arch/x
-by: Thomas Garnier
Reviewed-by: Juergen Gross
---
arch/x86/tools/relocs.c | 16 +++-
arch/x86/xen/xen-head.S | 11 ++-
arch/x86/xen/xen-pvh.S | 13 +
3 files changed, 30 insertions(+), 10 deletions(-)
diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
Executable (PIE) support will allow to extend the
KASLR randomization range 0x8000.
Signed-off-by: Thomas Garnier
---
arch/x86/entry/calling.h | 2 +-
arch/x86/entry/entry_64.S| 4 ++--
arch/x86/include/asm/percpu.h| 25 +++--
arch/x86/include/asm
Changes:
- patch v4:
- Simplify early boot by removing global variables.
- Modify the mcount location script for __mcount_loc intead of the address
read in the ftrace implementation.
- Edit commit description to explain better where the kernel can be located.
- Streamlined the
On Thu, May 24, 2018 at 1:41 PM Thomas Garnier wrote:
> On Thu, May 24, 2018 at 1:16 PM Steven Rostedt
wrote:
> > On Thu, 24 May 2018 13:40:24 +0200
> > Petr Mladek wrote:
> > > On Wed 2018-05-23 12:54:15, Thomas Garnier wrote:
> > > > When u
On Tue, May 29, 2018 at 5:31 AM Pavel Machek wrote:
> On Fri 2018-05-25 10:00:04, Thomas Garnier wrote:
> > On Fri, May 25, 2018 at 2:14 AM Pavel Machek wrote:
> >
> > > On Thu 2018-05-24 09:35:42, Thomas Garnier wrote:
> > > > On Thu, May 24,
On Fri, May 25, 2018 at 2:14 AM Pavel Machek <pa...@ucw.cz> wrote:
> On Thu 2018-05-24 09:35:42, Thomas Garnier wrote:
> > On Thu, May 24, 2018 at 4:03 AM Pavel Machek <pa...@ucw.cz> wrote:
> >
> > > On Wed 2018-05-23 12:54:03, Thomas Garnier wrote:
> >
On Thu, May 24, 2018 at 1:16 PM Steven Rostedt <rost...@goodmis.org> wrote:
> On Thu, 24 May 2018 13:40:24 +0200
> Petr Mladek <pmla...@suse.com> wrote:
> > On Wed 2018-05-23 12:54:15, Thomas Garnier wrote:
> > > When using -fPIE/PIC with function tracing, th
On Thu, May 24, 2018 at 4:04 AM Pavel Machek <pa...@ucw.cz> wrote:
> On Wed 2018-05-23 12:54:05, Thomas Garnier wrote:
> > Change the assembly code to use only relative references of symbols for
the
> > kernel to be PIE compatible.
> >
> > Position Independent Ex
On Thu, May 24, 2018 at 4:03 AM Pavel Machek <pa...@ucw.cz> wrote:
> On Wed 2018-05-23 12:54:03, Thomas Garnier wrote:
> > Change the assembly code to use only relative references of symbols for
the
> > kernel to be PIE compatible.
> >
> > Position Independent Ex
On Wed, May 23, 2018 at 2:27 PM Randy Dunlap <rdun...@infradead.org> wrote:
> Hi,
> (for several patches in this series:)
> The commit message is confusing. See below.
Thanks for the edits, I will change the different commit messages.
> On 05/23/2018 12:54 PM, Th
randomization range.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
Documentation/x86/x86_64/mm.txt | 3 +++
arch/x86/Kconfig| 4
arch/x86/include/asm/pgtable_64_types.h | 6 ++
arch/x86/kernel/head64.c| 5 -
arch/
the top 2G and 32-bit
integers are not enough.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/tools/relocs.c| 60 +++---
arch/x86/tools/relocs.h| 4 +--
arch/x86/tools/relocs_common.c | 15 ++---
3 files changed, 60 insertions(
Change the relocation tool to correctly handle relocations generated by
-fPIE option:
- Add relocation for each entry of the .got section given the linker does not
generate R_X86_64_GLOB_DAT on a simple link.
- Ignore R_X86_64_GOTPCREL.
Signed-off-by: Thomas Garnier <thgar...@google.
-0.1%)
- PIE enabled: average -0.4% to +0.4%.
[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
Signed-off-by: Thomas Garnier <thgar...@google.com>
merge pie
---
arch/x86/Kconfig | 8
arch/x86/Makefile | 45 -
2 files chang
/end of sections). In this case,
older versions of GCC will remove the comparison if the symbols are
hidden. This issue exists at least on gcc 4.9 and before.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/boot/boot.h | 2 +-
arch/x86/include/asm/s
5-bytes as before.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/include/asm/ftrace.h | 6 +++--
arch/x86/include/asm/sections.h | 4
ar
.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/tools/relocs.c | 16 +++-
arch/x86/xen/xen-head.S | 11 ++-
arch/x86/xen/xen-pvh.S | 13 +
3 files changed, 30 insertions(+), 10 deletions(-)
diff --git a/arch/x86/tools/relocs.c b/arch/x86
Adapt module loading to support PIE relocations. Generate dynamic GOT if
a symbol requires it but no entry exist in the kernel GOT.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <th
three PUD pages.
The relocation table uses 64-bit integers generated with the updated
relocation tool with the large-reloc option.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/Kconfig | 21 +
arch/x86/boot/compressed/Makefile
and the
global variable stack cookie is used. If a specific stack mode was
selected (regular or strong) and the compiler does not support selecting
the segment register, an error is emitted.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/Kconfig
Change the assembly code to use only relative references of symbols for the
kernel to be PIE compatible.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
The GOT is changed during early boot when relocations are applied. Make
it read-only directly. This table exists only for PIE binary.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier
Provide an option to have a PROVIDE_HIDDEN (linker script) entry for
each weak symbol. This option solve an error in x86_64 where the linker
optimizes pie generate code to be non-pie because --emit-relocs was used
instead of -pie (to reduce dynamic relocations).
Signed-off-by: Thomas Garnier
if PIE is enabled, switch the paravirt assembly constraints to be
compatible. The %c/i constrains generate smaller code so is kept by
default.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas
Change the assembly code to use only relative references of symbols for the
kernel to be PIE compatible.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
Change the assembly code to use only relative references of symbols for the
kernel to be PIE compatible.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
Change assembly to use the new _ASM_MOVABS macro instead of _ASM_MOV for
the assembly to be PIE compatible.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/include/asm/kvm_host.h | 8 ++--
arch/x86/kernel/kvm.c | 6 --
arch/x86/kvm/svm.c | 4 ++--
3 files changed, 12 insertions(+), 6 deletions(-)
diff --git
Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/kernel/Makefile | 6 ++
arch/x86/kernel/head64.c | 3 +++
2 files changed, 9 insertions(+)
diff --git a/ar
memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/include/asm/processor.h | 9 ++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index c119d423eacb..81ae6877df29 100644
---
Replace the %c constraint with %P. The %c is incompatible with PIE
because it implies an immediate value whereas %P reference a symbol.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier
Change the assembly code to use only relative references of symbols for the
kernel to be PIE compatible.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
Change the assembly code to use only relative references of symbols for the
kernel to be PIE compatible.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
as expected.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/kernel/head_64.S | 26 --
1 file changed, 20 insertions
Add a new _ASM_MOVABS macro to fetch a symbol address. It will be used
to replace "_ASM_MOV $, %dst" code construct that are not compatible
with PIE.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/include/asm/asm.h | 1 +
1 file changed, 1 insertion(+)
diff
Replace the %c constraint with %P. The %c is incompatible with PIE
because it implies an immediate value whereas %P reference a symbol.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier
Changes:
- patch v3:
- Update on message to describe longer term PIE goal.
- Minor change on ftrace if condition.
- Changed code using xchgq.
- patch v2:
- Adapt patch to work post KPTI and compiler changes
- Redo all performance testing with latest configs and compilers
-
On Wed, Mar 14, 2018 at 8:55 AM Christopher Lameter <c...@linux.com> wrote:
> On Wed, 14 Mar 2018, Peter Zijlstra wrote:
> > On Tue, Mar 13, 2018 at 01:59:24PM -0700, Thomas Garnier wrote:
> > > @@ -1576,7 +1578,9 @@ first_nmi:
> > > addq
randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/include/asm/kvm_host.h | 6 --
arch/x86/kernel/kvm.c | 6 --
arch/x86/kvm/svm.c | 4 ++--
3 files changed, 10 insertions(+), 6 deletions(-)
diff --git
and the
global variable stack cookie is used. If a specific stack mode was
selected (regular or strong) and the compiler does not support selecting
the segment register, an error is emitted.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/Kconfig
The GOT is changed during early boot when relocations are applied. Make
it read-only directly. This table exists only for PIE binary.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier
the top 2G and 32-bit
integers are not enough.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/tools/relocs.c| 60 +++---
arch/x86/tools/relocs.h| 4 +--
arch/x86/tools/relocs_common.c | 15 ++---
3 files changed, 60 insertions(
.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/tools/relocs.c | 16 +++-
arch/x86/xen/xen-head.S | 11 ++-
arch/x86/xen/xen-pvh.S | 13 +
3 files changed, 30 insertions(+), 10 deletions(-)
diff --git a/arch/x86/tools/relocs.c b/arch/x86
three PUD pages.
The relocation table uses 64-bit integers generated with the updated
relocation tool with the large-reloc option.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/Kconfig | 21 +
arch/x86/boot/compressed/Makefile
-0.1%)
- PIE enabled: average -0.4% to +0.4%.
[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
Signed-off-by: Thomas Garnier <thgar...@google.com>
merge pie
---
arch/x86/Kconfig | 8
arch/x86/Makefile | 45 -
2 files chang
5-bytes as before.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/include/asm/ftrace.h | 6 +++--
arch/x86/include/asm/sections.h | 4
ar
randomization range.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
Documentation/x86/x86_64/mm.txt | 3 +++
arch/x86/Kconfig| 4
arch/x86/include/asm/pgtable_64_types.h | 6 ++
arch/x86/kernel/head64.c| 5 -
arch/
Change the assembly code to use only relative references of symbols for the
kernel to be PIE compatible.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/kernel/Makefile | 6 ++
arch/x86/kernel/head64.c | 3 +++
2 files changed, 9 insertions(+)
diff --git a/ar
Change the relocation tool to correctly handle relocations generated by
-fPIE option:
- Add relocation for each entry of the .got section given the linker does not
generate R_X86_64_GLOB_DAT on a simple link.
- Ignore R_X86_64_GOTPCREL.
Signed-off-by: Thomas Garnier <thgar...@google.
as expected.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/kernel/head_64.S | 26 --
1 file changed, 20 insertions
Change the assembly code to use only relative references of symbols for the
kernel to be PIE compatible.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
if PIE is enabled, switch the paravirt assembly constraints to be
compatible. The %c/i constrains generate smaller code so is kept by
default.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas
Change the assembly code to use only relative references of symbols for the
kernel to be PIE compatible.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
Replace the %c constraint with %P. The %c is incompatible with PIE
because it implies an immediate value whereas %P reference a symbol.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier
Provide an option to have a PROVIDE_HIDDEN (linker script) entry for
each weak symbol. This option solve an error in x86_64 where the linker
optimizes pie generate code to be non-pie because --emit-relocs was used
instead of -pie (to reduce dynamic relocations).
Signed-off-by: Thomas Garnier
Change assembly to use the new _ASM_MOVABS macro instead of _ASM_MOV for
the assembly to be PIE compatible.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
/end of sections). In this case,
older versions of GCC will remove the comparison if the symbols are
hidden. This issue exists at least on gcc 4.9 and before.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/boot/boot.h | 2 +-
arch/x86/include/asm/s
Change the assembly code to use only relative references of symbols for the
kernel to be PIE compatible.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
Change the assembly code to use only relative references of symbols for the
kernel to be PIE compatible.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
Changes:
- patch v2:
- Adapt patch to work post KPTI and compiler changes
- Redo all performance testing with latest configs and compilers
- Simplify mov macro on PIE (MOVABS now)
- Reduce GOT footprint
- patch v1:
- Simplify ftrace implementation.
- Use gcc
Add a new _ASM_MOVABS macro to fetch a symbol address. It will be used
to replace "_ASM_MOV $, %dst" code construct that are not compatible
with PIE.
Signed-off-by: Thomas Garnier <thgar...@google.com>
---
arch/x86/include/asm/asm.h | 1 +
1 file changed, 1 insertion(+)
diff
Replace the %c constraint with %P. The %c is incompatible with PIE
because it implies an immediate value whereas %P reference a symbol.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier
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