BMC/Intel-BMC/linux.git/arch/arm64/kernel/setup.c, branch dev-4.10

arm64: setup: introduce kaslr_offset()

2016-12-20T17:48:46+00:00

Introduce kaslr_offset() similar to x86_64 to fix kcov. [ Updated by Will Deacon ] Link: http://lkml.kernel.org/r/1481417456-28826-2-git-send-email-alex.popov@linux.com Signed-off-by: Alexander Popov Cc: Catalin Marinas Cc: Ard Biesheuvel Cc: Mark Rutland Cc: Rob Herring Cc: Kefeng Wang Cc: AKASHI Takahiro Cc: Jon Masters Cc: David Daney Cc: Ganapatrao Kulkarni Cc: Dmitry Vyukov Cc: Nicolai Stange Cc: James Morse Cc: Andrey Ryabinin Cc: Andrey Konovalov Cc: Alexander Popov Cc: syzkaller Signed-off-by: Andrew Morton Signed-off-by: Will Deacon Signed-off-by: Linus Torvalds

arm64: Disable TTBR0_EL1 during normal kernel execution

2016-11-21T18:48:54+00:00

When the TTBR0 PAN feature is enabled, the kernel entry points need to disable access to TTBR0_EL1. The PAN status of the interrupted context is stored as part of the saved pstate, reusing the PSR_PAN_BIT (22). Restoring access to TTBR0_EL1 is done on exception return if returning to user or returning to a context where PAN was disabled. Context switching via switch_mm() must defer the update of TTBR0_EL1 until a return to user or an explicit uaccess_enable() call. Special care needs to be taken for two cases where TTBR0_EL1 is set outside the normal kernel context switch operation: EFI run-time services (via efi_set_pgd) and CPU suspend (via cpu_(un)install_idmap). Code has been added to avoid deferred TTBR0_EL1 switching as in switch_mm() and restore the reserved TTBR0_EL1 when uninstalling the special TTBR0_EL1. User cache maintenance (user_cache_maint_handler and __flush_cache_user_range) needs the TTBR0_EL1 re-instated since the operations are performed by user virtual address. This patch also removes a stale comment on the switch_mm() function. Cc: Will Deacon Cc: James Morse Cc: Kees Cook Cc: Mark Rutland Signed-off-by: Catalin Marinas

arm64: Set UTS_MACHINE in the Makefile

2016-08-31T11:31:38+00:00

The make rpm target depends on proper UTS_MACHINE definition. Also, use the variable in arch/arm64/kernel/setup.c, so that it's not accidentally removed in the future. Reported-and-tested-by: Fabian Vogt Signed-off-by: Michal Marek Signed-off-by: Will Deacon

arm64: mark reserved memblock regions explicitly in iomem

2016-08-25T17:00:31+00:00

Kdump(kexec-tools) parses /proc/iomem to identify all the memory regions on the system. Since the current kernel names "nomap" regions, like UEFI runtime services code/data, as "System RAM," kexec-tools sets up elf core header to include them in a crash dump file (/proc/vmcore). Then crash dump kernel parses UEFI memory map again, re-marks those regions as "nomap" and does not create a memory mapping for them unlike the other areas of System RAM. In this case, copying /proc/vmcore through copy_oldmem_page() on crash dump kernel will end up with a kernel abort, as reported in [1]. This patch names all the "nomap" regions explicitly as "reserved" so that we can exclude them from a crash dump file. acpi_os_ioremap() must also be modified because those regions have WB attributes [2]. Apart from kdump, this change also matches x86's use of acpi (and /proc/iomem). [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2016-August/448186.html [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2016-August/450089.html Reviewed-by: Catalin Marinas Tested-by: James Morse Reviewed-by: James Morse Signed-off-by: AKASHI Takahiro Signed-off-by: Will Deacon

Merge tag 'devicetree-for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux

2016-07-30T18:32:01+00:00

Pull DeviceTree updates from Rob Herring: - remove most of_platform_populate() calls in arch code. Now the DT core code calls it in the default case and platforms only need to call it if they have special needs - use pr_fmt on all the DT core print statements - CoreSight binding doc improvements to block name descriptions - add dt_to_config script which can parse dts files and list corresponding kernel config options - fix memory leak hit with a PowerMac DT - correct a bunch of STMicro compatible strings to use the correct vendor prefix - fix DA9052 PMIC binding doc to match what is actually used in dts files * tag 'devicetree-for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: (35 commits) documentation: da9052: Update regulator bindings names to match DA9052/53 DTS expectations xtensa: Partially Revert "xtensa: Remove unnecessary of_platform_populate with default match table" xtensa: Fix build error due to missing include file MIPS: ath79: Add missing include file Fix spelling errors in Documentation/devicetree ARM: dts: fix STMicroelectronics compatible strings powerpc/dts: fix STMicroelectronics compatible strings Documentation: dt: i2c: use correct STMicroelectronics vendor prefix scripts/dtc: dt_to_config - kernel config options for a devicetree of: fdt: mark unflattened tree as detached of: overlay: add resolver error prints coresight: document binding acronyms Documentation/devicetree: document cavium-pip rx-delay/tx-delay properties of: use pr_fmt prefix for all console printing of/irq: Mark initialised interrupt controllers as populated of: fix memory leak related to safe_name() Revert "of/platform: export of_default_bus_match_table" of: unittest: use of_platform_default_populate() to populate default bus memory: omap-gpmc: use of_platform_default_populate() to populate default bus bus: uniphier-system-bus: use of_platform_default_populate() to populate default bus ...

Merge tag 'for-linus-4.8-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

2016-07-27T18:35:37+00:00

Pull xen updates from David Vrabel: "Features and fixes for 4.8-rc0: - ACPI support for guests on ARM platforms. - Generic steal time support for arm and x86. - Support cases where kernel cpu is not Xen VCPU number (e.g., if in-guest kexec is used). - Use the system workqueue instead of a custom workqueue in various places" * tag 'for-linus-4.8-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: (47 commits) xen: add static initialization of steal_clock op to xen_time_ops xen/pvhvm: run xen_vcpu_setup() for the boot CPU xen/evtchn: use xen_vcpu_id mapping xen/events: fifo: use xen_vcpu_id mapping xen/events: use xen_vcpu_id mapping in events_base x86/xen: use xen_vcpu_id mapping when pointing vcpu_info to shared_info x86/xen: use xen_vcpu_id mapping for HYPERVISOR_vcpu_op xen: introduce xen_vcpu_id mapping x86/acpi: store ACPI ids from MADT for future usage x86/xen: update cpuid.h from Xen-4.7 xen/evtchn: add IOCTL_EVTCHN_RESTRICT xen-blkback: really don't leak mode property xen-blkback: constify instance of "struct attribute_group" xen-blkfront: prefer xenbus_scanf() over xenbus_gather() xen-blkback: prefer xenbus_scanf() over xenbus_gather() xen: support runqueue steal time on xen arm/xen: add support for vm_assist hypercall xen: update xen headers xen-pciback: drop superfluous variables xen-pciback: short-circuit read path used for merging write values ...

Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

2016-07-27T18:16:05+00:00

Pull arm64 updates from Catalin Marinas: - Kexec support for arm64 - Kprobes support - Expose MIDR_EL1 and REVIDR_EL1 CPU identification registers to sysfs - Trapping of user space cache maintenance operations and emulation in the kernel (CPU errata workaround) - Clean-up of the early page tables creation (kernel linear mapping, EFI run-time maps) to avoid splitting larger blocks (e.g. pmds) into smaller ones (e.g. ptes) - VDSO support for CLOCK_MONOTONIC_RAW in clock_gettime() - ARCH_HAS_KCOV enabled for arm64 - Optimise IP checksum helpers - SWIOTLB optimisation to only allocate/initialise the buffer if the available RAM is beyond the 32-bit mask - Properly handle the "nosmp" command line argument - Fix for the initialisation of the CPU debug state during early boot - vdso-offsets.h build dependency workaround - Build fix when RANDOMIZE_BASE is enabled with MODULES off * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (64 commits) arm64: arm: Fix-up the removal of the arm64 regs_query_register_name() prototype arm64: Only select ARM64_MODULE_PLTS if MODULES=y arm64: mm: run pgtable_page_ctor() on non-swapper translation table pages arm64: mm: make create_mapping_late() non-allocating arm64: Honor nosmp kernel command line option arm64: Fix incorrect per-cpu usage for boot CPU arm64: kprobes: Add KASAN instrumentation around stack accesses arm64: kprobes: Cleanup jprobe_return arm64: kprobes: Fix overflow when saving stack arm64: kprobes: WARN if attempting to step with PSTATE.D=1 arm64: debug: remove unused local_dbg_{enable, disable} macros arm64: debug: remove redundant spsr manipulation arm64: debug: unmask PSTATE.D earlier arm64: localise Image objcopy flags arm64: ptrace: remove extra define for CPSR's E bit kprobes: Add arm64 case in kprobe example module arm64: Add kernel return probes support (kretprobes) arm64: Add trampoline code for kretprobes arm64: kprobes instruction simulation support arm64: Treat all entry code as non-kprobe-able ...

ARM: XEN: Move xen_early_init() before efi_init()

2016-07-06T09:34:45+00:00

Move xen_early_init() before efi_init(), then when calling efi_init() could initialize Xen specific UEFI. Check if it runs on Xen hypervisor through the flat dts. Cc: Russell King Signed-off-by: Shannon Zhao Reviewed-by: Stefano Stabellini Reviewed-by: Julien Grall Tested-by: Julien Grall Acked-by: Catalin Marinas

arm64: mm: fix location of _etext

2016-06-27T17:21:27+00:00

As Kees Cook notes in the ARM counterpart of this patch [0]: The _etext position is defined to be the end of the kernel text code, and should not include any part of the data segments. This interferes with things that might check memory ranges and expect executable code up to _etext. In particular, Kees is referring to the HARDENED_USERCOPY patch set [1], which rejects attempts to call copy_to_user() on kernel ranges containing executable code, but does allow access to the .rodata segment. Regardless of whether one may or may not agree with the distinction, it makes sense for _etext to have the same meaning across architectures. So let's put _etext where it belongs, between .text and .rodata, and fix up existing references to use __init_begin instead, which unlike _end_rodata includes the exception and notes sections as well. The _etext references in kaslr.c are left untouched, since its references to [_stext, _etext) are meant to capture potential jump instruction targets, and so disregarding .rodata is actually an improvement here. [0] http://article.gmane.org/gmane.linux.kernel/2245084 [1] http://thread.gmane.org/gmane.linux.kernel.hardened.devel/2502 Reported-by: Kees Cook Reviewed-by: Mark Rutland Signed-off-by: Ard Biesheuvel Reviewed-by: Kees Cook Signed-off-by: Catalin Marinas

arm64: Remove unnecessary of_platform_populate with default match table

2016-06-23T19:59:16+00:00

After patch "of/platform: Add common method to populate default bus", it is possible for arch code to remove unnecessary callers of of_platform_populate with default match table. Acked-by: Catalin Marinas Cc: Will Deacon Cc: Arnd Bergmann Signed-off-by: Kefeng Wang Signed-off-by: Rob Herring