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  1. 10 9月, 2015 2 次提交
  3. 27 8月, 2015 3 次提交
    • R
      ARM: software-based priviledged-no-access support · a5e090ac
      由 Russell King 提交于 
      Provide a software-based implementation of the priviledged no access
support found in ARMv8.1.

Userspace pages are mapped using a different domain number from the
kernel and IO mappings.  If we switch the user domain to "no access"
when we enter the kernel, we can prevent the kernel from touching
userspace.

However, the kernel needs to be able to access userspace via the
various user accessor functions.  With the wrapping in the previous
patch, we can temporarily enable access when the kernel needs user
access, and re-disable it afterwards.

This allows us to trap non-intended accesses to userspace, eg, caused
by an inadvertent dereference of the LIST_POISON* values, which, with
appropriate user mappings setup, can be made to succeed.  This in turn
can allow use-after-free bugs to be further exploited than would
otherwise be possible.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      a5e090ac
    • R
      ARM: entry: provide uaccess assembly macro hooks · 2190fed6
      由 Russell King 提交于 
      Provide hooks into the kernel entry and exit paths to permit control
of userspace visibility to the kernel.  The intended use is:

- on entry to kernel from user, uaccess_disable will be called to
  disable userspace visibility
- on exit from kernel to user, uaccess_enable will be called to
  enable userspace visibility
- on entry from a kernel exception, uaccess_save_and_disable will be
  called to save the current userspace visibility setting, and disable
  access
- on exit from a kernel exception, uaccess_restore will be called to
  restore the userspace visibility as it was before the exception
  occurred.

These hooks allows us to keep userspace visibility disabled for the
vast majority of the kernel, except for localised regions where we
want to explicitly access userspace.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      2190fed6
    • R
      ARM: entry: get rid of multiple macro definitions · aa06e5c1
      由 Russell King 提交于 
      The following structure is just asking for trouble:

 #ifdef CONFIG_symbol
	.macro foo
	...
	.endm
	.macro bar
	...
	.endm
	.macro baz
	...
	.endm
 #else
	.macro foo
	...
	.endm
	.macro bar
	...
	.endm
 #ifdef CONFIG_symbol2
	.macro baz
	...
	.endm
 #else
	.macro baz
	...
	.endm
 #endif
 #endif

such as one defintion being updated, but the other definitions miss out.
Where the contents of a macro needs to be conditional, the hint is in
the first clause of this very sentence.  "contents" "conditional".  Not
multiple separate definitions, especially not when much of the macro
is the same between different configs.

This patch fixes this bad style, which had caused the Thumb2 code to
miss-out on the uaccess updates.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      aa06e5c1
  5. 25 8月, 2015 2 次提交
  7. 21 8月, 2015 6 次提交
  9. 04 7月, 2015 7 次提交
  11. 03 7月, 2015 3 次提交
    • H
      ARM64 / SMP: Switch pr_err() to pr_debug() for disabled GICC entry · f9058929
      由 Hanjun Guo 提交于 
      It is normal that firmware presents GICC entry or entries (processors)
with disabled flag in ACPI MADT, taking a system of 16 cpus for example,
ACPI firmware may present 8 ebabled first with another 8 cpus disabled
in MADT, the disabled cpus can be hot-added later.

Firmware may also present more cpus than the hardware actually has, but
disabled the unused ones, and easily enable it when the hardware has such
cpus to make the firmware code scalable.

So that's not an error for disabled cpus in MADT, we can switch pr_err()
to pr_debug() to make the boot a little quieter by default.

Since hwid for disabled cpus often are invalid, and we check invalid hwid
first in the code, for use case that hot add cpus later will be filtered
out and will not be counted in possible cups, so move this check before
the hwid one to prepare the code to count for disabeld cpus when cpu
hot-plug is introduced.
Signed-off-by: NHanjun Guo <hanjun.guo@linaro.org>
Reviewed-by: NAl Stone <ahs3@redhat.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
      f9058929
    • T
      [IA64] Drop debug test/printk that some special pages are marked reserved · 43c518d1
      由 Tony Luck 提交于 
      In commit 92923ca3 "mm: meminit: only set page reserved in the memblock region"
we dropped setting the reserved bits for all pages. This results in some warnings
on ia64:

put_kernel_page: page at 0xe000000005588000 not in reserved memory
put_kernel_page: page at 0xe000000005588000 not in reserved memory
put_kernel_page: page at 0xe000000005580000 not in reserved memory
put_kernel_page: page at 0xe000000005580000 not in reserved memory
put_kernel_page: page at 0xe000000005580000 not in reserved memory
put_kernel_page: page at 0xe000000005580000 not in reserved memory

the two different pages match up with two objects from the loaded kernel
that get mapped by arch/ia64/mm/init.c:setup_gate()

a000000101588000 D __start_gate_section
a000000101580000 D empty_zero_page

In a discussion with Mel Gorman:
  http://lkml.kernel.org/r/20150526102219.GB13750%40suse.de
he suggested that while the preferred approach might be to
set the reserved bit for these pages, it would also be OK
to just drop the test:
   "as it's a debugging check that is ia-64 specific"

After hunting around a bit and failin to find a good place to mark these
pages as reserved - I decided to just delete the test.
Signed-off-by: NTony Luck <tony.luck@intel.com>
      43c518d1
    • J
      arm64: cpuidle: add __init section marker to arm_cpuidle_init · ea389daa
      由 Jisheng Zhang 提交于 
      It is not needed after booting, this patch moves the arm_cpuidle_init()
function to the __init section.
Signed-off-by: NJisheng Zhang <jszhang@marvell.com>
Reviewed-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
      ea389daa
  13. 02 7月, 2015 4 次提交
  15. 01 7月, 2015 13 次提交