- 23 Dec, 2020 2 commits
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Linus Torvalds authored
Merge tag 'tag-chrome-platform-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux Pull chrome platform updates from Benson Leung: "cros_ec_typec: - A series from Prashant for Type-C to implement TYPEC_STATUS, parsing USB PD Partner ID VDOs, and registering partner altmodes. cros_ec misc: - Don't treat RTC events as wakeup sources in cros_ec_proto" * tag 'tag-chrome-platform-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux: platform/chrome: cros_ec_typec: Tolerate unrecognized mux flags platform/chrome: cros_ec_typec: Register partner altmodes platform/chrome: cros_ec_typec: Parse partner PD ID VDOs platform/chrome: cros_ec_typec: Introduce TYPEC_STATUS platform/chrome: cros_ec: Import Type C host commands platform/chrome: cros_ec_typec: Clear partner identity on device removal platform/chrome: cros_ec_typec: Fix remove partner logic platform/chrome: cros_ec_typec: Relocate set_port_params_v*() functions platform/chrome: Don't treat RTC events as wakeup sources
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git://www.linux-watchdog.org/linux-watchdogLinus Torvalds authored
Pull watchdog updates from Wim Van Sebroeck: - Removal of the pnx83xx driver - Add a binding for A100's watchdog controller - Add Rockchip compatibles to snps,dw-wdt.yaml - hpwdt: Disable NMI in Crash Kernel - Fix potential dereferencing of null pointer in watchdog_core - Several other small fixes and improvements * tag 'linux-watchdog-5.11-rc1' of git://www.linux-watchdog.org/linux-watchdog: (23 commits) watchdog: convert comma to semicolon watchdog: iTCO_wdt: use dev_*() instead of pr_*() for logging dt-binding: watchdog: add Rockchip compatibles to snps,dw-wdt.yaml watchdog: coh901327: add COMMON_CLK dependency dt-bindings: watchdog: sun4i: Add A100 compatible watchdog: qcom: Avoid context switch in restart handler watchdog: iTCO_wdt: use module_platform_device() macro watchdog: Fix potential dereferencing of null pointer watchdog: wdat_wdt: Fix missing kerneldoc reported by W=1 watchdog/hpwdt: Reflect changes watchdog/hpwdt: Disable NMI in Crash Kernel wdt: sp805: add watchdog_stop on reboot watchdog: sbc_fitpc2_wdt: add __user annotations watchdog: geodewdt: remove unneeded break watchdog: rti-wdt: fix reference leak in rti_wdt_probe watchdog: qcom_wdt: set WDOG_HW_RUNNING bit when appropriate watchdog: remove pnx83xx driver watchdog: stm32_iwdg: don't print an error on probe deferral watchdog: sprd: change to use usleep_range() instead of busy loop watchdog: sprd: check busy bit before new loading rather than after that ...
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- 22 Dec, 2020 38 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pmLinus Torvalds authored
Pull more ACPI updates from Rafael Wysocki: "These make the ACPI enumeration of devices take _DEP information into account more aggressively, fix device IDs matching in the ACPI part of the PNP devices framework and update the ACPI code related to suspend-to-idle to take systems based on AMD hardware into account properly. Specifics: - Modify the ACPI device enumeration code to defer the enumeration of devices with an _HID whose lists of operation region dependencies returned by _DEP are not empty after eliminating the entries representing known-benign dependencies from them (Rafael Wysocki, Hans de Goede). - Make the ACPI PNP code mathing device IDs also take the length of the given ID string into account (Hui Wang). - Add AMD systems support to the ACPI code handling suspend-to-idle via the PNP0D80 (System Power Management Controller) device _DSM interface (Shyam Sundar). - Move the suspend-to-idle handling code related to the PNP0D80 device _DSM interface, which is x86-specific, to a separate file in the x86/ subdirectory (Rafael Wysocki)" * tag 'acpi-5.11-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: ACPI: PM: s2idle: Move x86-specific code to the x86 directory ACPI: scan: Add Intel Baytrail Mailbox Device to acpi_ignore_dep_ids ACPI: scan: Avoid unnecessary second pass in acpi_bus_scan() ACPI: scan: Defer enumeration of devices with _DEP lists ACPI: scan: Evaluate _DEP before adding the device ACPI: PM: s2idle: Add AMD support to handle _DSM ACPI: PNP: compare the string length in the matching_id() -
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pmLinus Torvalds authored
Pull more power management updates from Rafael Wysocki: "These update the CPPC cpufreq driver and intel_pstate (which involves updating the cpufreq core and the schedutil governor) and make janitorial changes in the ACPI code handling processor objects. Specifics: - Rework the passive-mode "fast switch" path in the intel_pstate driver to allow it receive the minimum (required) and target (desired) performance information from the schedutil governor so as to avoid running some workloads too fast (Rafael Wysocki). - Make the intel_pstate driver allow the policy max limit to be increased after the guaranteed performance value for the given CPU has increased (Rafael Wysocki). - Clean up the handling of CPU coordination types in the CPPC cpufreq driver and make it export frequency domains information to user space via sysfs (Ionela Voinescu). - Fix the ACPI code handling processor objects to use a correct coordination type when it fails to map frequency domains and drop a redundant CPU map initialization from it (Ionela Voinescu, Punit Agrawal)" * tag 'pm-5.11-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: cpufreq: intel_pstate: Use most recent guaranteed performance values cpufreq: intel_pstate: Implement the ->adjust_perf() callback cpufreq: Add special-purpose fast-switching callback for drivers cpufreq: schedutil: Add util to struct sg_cpu cppc_cpufreq: replace per-cpu data array with a list cppc_cpufreq: expose information on frequency domains cppc_cpufreq: clarify support for coordination types cppc_cpufreq: use policy->cpu as driver of frequency setting ACPI: processor: fix NONE coordination for domain mapping failure -
git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuildLinus Torvalds authored
Pull Kconfig updates from Masahiro Yamada: - Support only Qt5 for qconf - Validate signal/slot connection at compile time of qconf - Sanitize header includes * tag 'kconfig-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: kconfig: doc: fix $(fileno) to $(filename) kconfig: fix return value of do_error_if() kconfig: clean up header inclusion kconfig: qconf: show Qt version in the About dialog kconfig: make lkc.h self-sufficient #include-wise kconfig: qconf: convert to Qt5 new signal/slot connection syntax kconfig: qconf: use a variable to pass packages to pkg-config kconfig: qconf: drop Qt4 support
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git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuildLinus Torvalds authored
Pull Kbuild updates from Masahiro Yamada: - Use /usr/bin/env for shebang lines in scripts - Remove useless -Wnested-externs warning flag - Update documents - Refactor log handling in modpost - Stop building modules without MODULE_LICENSE() tag - Make the insane combination of 'static' and EXPORT_SYMBOL an error - Improve genksyms to handle _Static_assert() * tag 'kbuild-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: Documentation/kbuild: Document platform dependency practises Documentation/kbuild: Document COMPILE_TEST dependencies genksyms: Ignore module scoped _Static_assert() modpost: turn static exports into error modpost: turn section mismatches to error from fatal() modpost: change license incompatibility to error() from fatal() modpost: turn missing MODULE_LICENSE() into error modpost: refactor error handling and clarify error/fatal difference modpost: rename merror() to error() kbuild: don't hardcode depmod path kbuild: doc: document subdir-y syntax kbuild: doc: clarify the difference between extra-y and always-y kbuild: doc: split if_changed explanation to a separate section kbuild: doc: merge 'Special Rules' and 'Custom kbuild commands' sections kbuild: doc: fix 'List directories to visit when descending' section kbuild: doc: replace arch/$(ARCH)/ with arch/$(SRCARCH)/ kbuild: doc: update the description about kbuild Makefiles Makefile.extrawarn: remove -Wnested-externs warning tweewide: Fix most Shebang lines
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Linus Torvalds authored
Merge KASAN updates from Andrew Morton. This adds a new hardware tag-based mode to KASAN. The new mode is similar to the existing software tag-based KASAN, but relies on arm64 Memory Tagging Extension (MTE) to perform memory and pointer tagging (instead of shadow memory and compiler instrumentation). By Andrey Konovalov and Vincenzo Frascino. * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (60 commits) kasan: update documentation kasan, mm: allow cache merging with no metadata kasan: sanitize objects when metadata doesn't fit kasan: clarify comment in __kasan_kfree_large kasan: simplify assign_tag and set_tag calls kasan: don't round_up too much kasan, mm: rename kasan_poison_kfree kasan, mm: check kasan_enabled in annotations kasan: add and integrate kasan boot parameters kasan: inline (un)poison_range and check_invalid_free kasan: open-code kasan_unpoison_slab kasan: inline random_tag for HW_TAGS kasan: inline kasan_reset_tag for tag-based modes kasan: remove __kasan_unpoison_stack kasan: allow VMAP_STACK for HW_TAGS mode kasan, arm64: unpoison stack only with CONFIG_KASAN_STACK kasan: introduce set_alloc_info kasan: rename get_alloc/free_info kasan: simplify quarantine_put call site kselftest/arm64: check GCR_EL1 after context switch ...
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git://git.armlinux.org.uk/~rmk/linuxLinus Torvalds authored
Pull ARM updates from Russell King: - Rework phys/virt translation - Add KASan support - Move DT out of linear map region - Use more PC-relative addressing in assembly - Remove FP emulation handling while in kernel mode - Link with '-z norelro' - remove old check for GCC <= 4.2 in ARM unwinder code - disable big endian if using clang's linker * tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm: (46 commits) ARM: 9027/1: head.S: explicitly map DT even if it lives in the first physical section ARM: 9038/1: Link with '-z norelro' ARM: 9037/1: uncompress: Add OF_DT_MAGIC macro ARM: 9036/1: uncompress: Fix dbgadtb size parameter name ARM: 9035/1: uncompress: Add be32tocpu macro ARM: 9033/1: arm/smp: Drop the macro S(x,s) ARM: 9032/1: arm/mm: Convert PUD level pgtable helper macros into functions ARM: 9031/1: hyp-stub: remove unused .L__boot_cpu_mode_offset symbol ARM: 9044/1: vfp: use undef hook for VFP support detection ARM: 9034/1: __div64_32(): straighten up inline asm constraints ARM: 9030/1: entry: omit FP emulation for UND exceptions taken in kernel mode ARM: 9029/1: Make iwmmxt.S support Clang's integrated assembler ARM: 9028/1: disable KASAN in call stack capturing routines ARM: 9026/1: unwind: remove old check for GCC <= 4.2 ARM: 9025/1: Kconfig: CPU_BIG_ENDIAN depends on !LD_IS_LLD ARM: 9024/1: Drop useless cast of "u64" to "long long" ARM: 9023/1: Spelling s/mmeory/memory/ ARM: 9022/1: Change arch/arm/lib/mem*.S to use WEAK instead of .weak ARM: kvm: replace open coded VA->PA calculations with adr_l call ARM: head.S: use PC relative insn sequence to calculate PHYS_OFFSET ...
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Linus Torvalds authored
Merge tag 'for-5.11/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm Pull device mapper updates from Mike Snitzer: - Add DM verity support for signature verification with 2nd keyring - Fix DM verity to skip verity work if IO completes with error while system is shutting down - Add new DM multipath "IO affinity" path selector that maps IO destined to a given path to a specific CPU based on user provided mapping - Rename DM multipath path selector source files to have "dm-ps" prefix - Add REQ_NOWAIT support to some other simple DM targets that don't block in more elaborate ways waiting for IO - Export DM crypt's kcryptd workqueue via sysfs (WQ_SYSFS) - Fix error return code in DM's target_message() if empty message is received - A handful of other small cleanups * tag 'for-5.11/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm: dm cache: simplify the return expression of load_mapping() dm ebs: avoid double unlikely() notation when using IS_ERR() dm verity: skip verity work if I/O error when system is shutting down dm crypt: export sysfs of kcryptd workqueue dm ioctl: fix error return code in target_message dm crypt: Constify static crypt_iv_operations dm: add support for REQ_NOWAIT to various targets dm: rename multipath path selector source files to have "dm-ps" prefix dm mpath: add IO affinity path selector dm verity: Add support for signature verification with 2nd keyring dm: remove unnecessary current->bio_list check when submitting split bio
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Linus Torvalds authored
Merge tag 'hwmon-for-v5.11-take2' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging Pull another hwmon update from Guenter Roeck: "The only patch in this series is removal of voltage and current reporting for AMD Zen CPUs. Turns out that was not worth the trouble, because it's all undocumented and not maintainable" * tag 'hwmon-for-v5.11-take2' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging: hwmon: (k10temp) Remove support for displaying voltage and current on Zen CPUs
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git://git.infradead.org/users/hch/dma-mappingLinus Torvalds authored
Pull dma-mapping updates from Christoph Hellwig: - support for a partial IOMMU bypass (Alexey Kardashevskiy) - add a DMA API benchmark (Barry Song) - misc fixes (Tiezhu Yang, tangjianqiang) * tag 'dma-mapping-5.11' of git://git.infradead.org/users/hch/dma-mapping: selftests/dma: add test application for DMA_MAP_BENCHMARK dma-mapping: add benchmark support for streaming DMA APIs dma-contiguous: fix a typo error in a comment dma-pool: no need to check return value of debugfs_create functions powerpc/dma: Fallback to dma_ops when persistent memory present dma-mapping: Allow mixing bypass and mapped DMA operation
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git://git.infradead.org/users/hch/configfsLinus Torvalds authored
Pull configfs update from Christoph Hellwig: "Fix a kerneldoc comment (Alex Shi)" * tag 'configfs-5.11' of git://git.infradead.org/users/hch/configfs: configfs: fix kernel-doc markup issue
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git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfatLinus Torvalds authored
Pull exfat update from Namjae Jeon: "Avoid page allocation failure from upcase table allocation" * tag 'exfat-for-5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat: exfat: Avoid allocating upcase table using kcalloc()
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Andi Kleen authored
When a split lock is detected always make sure to disable interrupts before returning from the trap handler. The kernel exit code assumes that all exits run with interrupts disabled, otherwise the SWAPGS sequence can race against interrupts and cause recursing page faults and later panics. The problem will only happen on CPUs with split lock disable functionality, so Icelake Server, Tiger Lake, Snow Ridge, Jacobsville. Fixes: ca4c6a98 ("x86/traps: Make interrupt enable/disable symmetric in C code") Fixes: bce9b042 ("x86/traps: Disable interrupts in exc_aligment_check()") # v5.8+ Signed-off-by:
Andi Kleen <ak@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Tony Luck <tony.luck@intel.com> Reviewed-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Andrey Konovalov authored
This change updates KASAN documentation to reflect the addition of boot parameters and also reworks and clarifies some of the existing sections, in particular: defines what a memory granule is, mentions quarantine, makes Kunit section more readable. Link: https://lkml.kernel.org/r/748daf013e17d925b0fe00c1c3b5dce726dd2430.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/Ib1f83e91be273264b25f42b04448ac96b858849fSigned-off-by:
Andrey Konovalov <andreyknvl@google.com> Reviewed-by:
Dmitry Vyukov <dvyukov@google.com> Reviewed-by:
Marco Elver <elver@google.com> Tested-by:
Vincenzo Frascino <vincenzo.frascino@arm.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Branislav Rankov <Branislav.Rankov@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Evgenii Stepanov <eugenis@google.com> Cc: Kevin Brodsky <kevin.brodsky@arm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
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Andrey Konovalov authored
The reason cache merging is disabled with KASAN is because KASAN puts its metadata right after the allocated object. When the merged caches have slightly different sizes, the metadata ends up in different places, which KASAN doesn't support. It might be possible to adjust the metadata allocation algorithm and make it friendly to the cache merging code. Instead this change takes a simpler approach and allows merging caches when no metadata is present. Which is the case for hardware tag-based KASAN with kasan.mode=prod. Link: https://lkml.kernel.org/r/37497e940bfd4b32c0a93a702a9ae4cf061d5392.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/Ia114847dfb2244f297d2cb82d592bf6a07455dbaCo-developed-by:
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Andrey Konovalov authored
KASAN marks caches that are sanitized with the SLAB_KASAN cache flag. Currently if the metadata that is appended after the object (stores e.g. stack trace ids) doesn't fit into KMALLOC_MAX_SIZE (can only happen with SLAB, see the comment in the patch), KASAN turns off sanitization completely. With this change sanitization of the object data is always enabled. However the metadata is only stored when it fits. Instead of checking for SLAB_KASAN flag accross the code to find out whether the metadata is there, use cache->kasan_info.alloc/free_meta_offset. As 0 can be a valid value for free_meta_offset, introduce KASAN_NO_FREE_META as an indicator that the free metadata is missing. Without this change all sanitized KASAN objects would be put into quarantine with generic KASAN. With this change, only the objects that have metadata (i.e. when it fits) are put into quarantine, the rest is freed right away. Along the way rework __kasan_cache_create() and add claryfying comments. Link: https://lkml.kernel.org/r/aee34b87a5e4afe586c2ac6a0b32db8dc4dcc2dc.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/Icd947e2bea054cb5cfbdc6cf6652227d97032dcbCo-developed-by:
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Andrey Konovalov authored
Currently it says that the memory gets poisoned by page_alloc code. Clarify this by mentioning the specific callback that poisons the memory. Link: https://lkml.kernel.org/r/1c8380fe0332a3bcc720fe29f1e0bef2e2974416.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/I1334dffb69b87d7986fab88a1a039cc3ea764725Signed-off-by:
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Andrey Konovalov authored
set_tag() already ignores the tag for the generic mode, so just call it as is. Add a check for the generic mode to assign_tag(), and simplify its call in ____kasan_kmalloc(). Link: https://lkml.kernel.org/r/121eeab245f98555862b289d2ba9269c868fbbcf.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/I18905ca78fb4a3d60e1a34a4ca00247272480438Signed-off-by:
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Andrey Konovalov authored
For hardware tag-based mode kasan_poison_memory() already rounds up the size. Do the same for software modes and remove round_up() from the common code. Link: https://lkml.kernel.org/r/47b232474f1f89dc072aeda0fa58daa6efade377.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/Ib397128fac6eba874008662b4964d65352db4aa4Signed-off-by:
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Andrey Konovalov authored
Rename kasan_poison_kfree() to kasan_slab_free_mempool() as it better reflects what this annotation does. Also add a comment that explains the PageSlab() check. No functional changes. Link: https://lkml.kernel.org/r/141675fb493555e984c5dca555e9d9f768c7bbaa.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/I5026f87364e556b506ef1baee725144bb04b8810Signed-off-by:
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Andrey Konovalov authored
Declare the kasan_enabled static key in include/linux/kasan.h and in include/linux/mm.h and check it in all kasan annotations. This allows to avoid any slowdown caused by function calls when kasan_enabled is disabled. Link: https://lkml.kernel.org/r/9f90e3c0aa840dbb4833367c2335193299f69023.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/I2589451d3c96c97abbcbf714baabe6161c6f153eCo-developed-by:
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Andrey Konovalov authored
Hardware tag-based KASAN mode is intended to eventually be used in production as a security mitigation. Therefore there's a need for finer control over KASAN features and for an existence of a kill switch. This change adds a few boot parameters for hardware tag-based KASAN that allow to disable or otherwise control particular KASAN features. The features that can be controlled are: 1. Whether KASAN is enabled at all. 2. Whether KASAN collects and saves alloc/free stacks. 3. Whether KASAN panics on a detected bug or not. With this change a new boot parameter kasan.mode allows to choose one of three main modes: - kasan.mode=off - KASAN is disabled, no tag checks are performed - kasan.mode=prod - only essential production features are enabled - kasan.mode=full - all KASAN features are enabled The chosen mode provides default control values for the features mentioned above. However it's also possible to override the default values by providing: - kasan.stacktrace=off/on - enable alloc/free stack collection (default: on for mode=full, otherwise off) - kasan.fault=report/panic - only report tag fault or also panic (default: report) If kasan.mode parameter is not provided, it defaults to full when CONFIG_DEBUG_KERNEL is enabled, and to prod otherwise. It is essential that switching between these modes doesn't require rebuilding the kernel with different configs, as this is required by the Android GKI (Generic Kernel Image) initiative [1]. [1] https://source.android.com/devices/architecture/kernel/generic-kernel-image [andreyknvl@google.com: don't use read-only static keys] Link: https://lkml.kernel.org/r/f2ded589eba1597f7360a972226083de9afd86e2.1607537948.git.andreyknvl@google.com Link: https://lkml.kernel.org/r/cb093613879d8d8841173f090133eddeb4c35f1f.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/If7d37003875b2ed3e0935702c8015c223d6416a4Signed-off-by: -
Andrey Konovalov authored
Using (un)poison_range() or check_invalid_free() currently results in function calls. Move their definitions to mm/kasan/kasan.h and turn them into static inline functions for hardware tag-based mode to avoid unneeded function calls. Link: https://lkml.kernel.org/r/7007955b69eb31b5376a7dc1e0f4ac49138504f2.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/Ia9d8191024a12d1374675b3d27197f10193f50bbSigned-off-by:
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Andrey Konovalov authored
There's the external annotation kasan_unpoison_slab() that is currently defined as static inline and uses kasan_unpoison_range(). Open-code this function in mempool.c. Otherwise with an upcoming change this function will result in an unnecessary function call. Link: https://lkml.kernel.org/r/131a6694a978a9a8b150187e539eecc8bcbf759b.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/Ia7c8b659f79209935cbaab3913bf7f082cc43a0eSigned-off-by:
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Andrey Konovalov authored
Using random_tag() currently results in a function call. Move its definition to mm/kasan/kasan.h and turn it into a static inline function for hardware tag-based mode to avoid uneeded function calls. Link: https://lkml.kernel.org/r/be438471690e351e1d792e6bb432e8c03ccb15d3.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/Iac5b2faf9a912900e16cca6834d621f5d4abf427Signed-off-by:
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Andrey Konovalov authored
Using kasan_reset_tag() currently results in a function call. As it's called quite often from the allocator code, this leads to a noticeable slowdown. Move it to include/linux/kasan.h and turn it into a static inline function. Also remove the now unneeded reset_tag() internal KASAN macro and use kasan_reset_tag() instead. Link: https://lkml.kernel.org/r/6940383a3a9dfb416134d338d8fac97a9ebb8686.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/I4d2061acfe91d480a75df00b07c22d8494ef14b5Signed-off-by:
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Andrey Konovalov authored
There's no need for __kasan_unpoison_stack() helper, as it's only currently used in a single place. Removing it also removes unneeded arithmetic. No functional changes. Link: https://lkml.kernel.org/r/93e78948704a42ea92f6248ff8a725613d721161.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/Ie5ba549d445292fe629b4a96735e4034957bcc50Signed-off-by:
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Andrey Konovalov authored
Even though hardware tag-based mode currently doesn't support checking vmalloc allocations, it doesn't use shadow memory and works with VMAP_STACK as is. Change VMAP_STACK definition accordingly. Link: https://lkml.kernel.org/r/ecdb2a1658ebd88eb276dee2493518ac0e82de41.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/I3552cbc12321dec82cd7372676e9372a2eb452acSigned-off-by:
Catalin Marinas <catalin.marinas@arm.com> Reviewed-by:
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Andrey Konovalov authored
There's a config option CONFIG_KASAN_STACK that has to be enabled for KASAN to use stack instrumentation and perform validity checks for stack variables. There's no need to unpoison stack when CONFIG_KASAN_STACK is not enabled. Only call kasan_unpoison_task_stack[_below]() when CONFIG_KASAN_STACK is enabled. Note, that CONFIG_KASAN_STACK is an option that is currently always defined when CONFIG_KASAN is enabled, and therefore has to be tested with #if instead of #ifdef. Link: https://lkml.kernel.org/r/d09dd3f8abb388da397fd11598c5edeaa83fe559.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/If8a891e9fe01ea543e00b576852685afec0887e3Signed-off-by:
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Andrey Konovalov authored
Add set_alloc_info() helper and move kasan_set_track() into it. This will simplify the code for one of the upcoming changes. No functional changes. Link: https://lkml.kernel.org/r/b2393e8f1e311a70fc3aaa2196461b6acdee7d21.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/I0316193cbb4ecc9b87b7c2eee0dd79f8ec908c1aSigned-off-by:
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Andrey Konovalov authored
Rename get_alloc_info() and get_free_info() to kasan_get_alloc_meta() and kasan_get_free_meta() to better reflect what those do and avoid confusion with kasan_set_free_info(). No functional changes. Link: https://lkml.kernel.org/r/27b7c036b754af15a2839e945f6d8bfce32b4c2f.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/Ib6e4ba61c8b12112b403d3479a9799ac8fff8de1Signed-off-by:
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Andrey Konovalov authored
Patch series "kasan: boot parameters for hardware tag-based mode", v4. === Overview Hardware tag-based KASAN mode [1] is intended to eventually be used in production as a security mitigation. Therefore there's a need for finer control over KASAN features and for an existence of a kill switch. This patchset adds a few boot parameters for hardware tag-based KASAN that allow to disable or otherwise control particular KASAN features, as well as provides some initial optimizations for running KASAN in production. There's another planned patchset what will further optimize hardware tag-based KASAN, provide proper benchmarking and tests, and will fully enable tag-based KASAN for production use. Hardware tag-based KASAN relies on arm64 Memory Tagging Extension (MTE) [2] to perform memory and pointer tagging. Please see [3] and [4] for detailed analysis of how MTE helps to fight memory safety problems. The features that can be controlled are: 1. Whether KASAN is enabled at all. 2. Whether KASAN collects and saves alloc/free stacks. 3. Whether KASAN panics on a detected bug or not. The patch titled "kasan: add and integrate kasan boot parameters" of this series adds a few new boot parameters. kasan.mode allows to choose one of three main modes: - kasan.mode=off - KASAN is disabled, no tag checks are performed - kasan.mode=prod - only essential production features are enabled - kasan.mode=full - all KASAN features are enabled The chosen mode provides default control values for the features mentioned above. However it's also possible to override the default values by providing: - kasan.stacktrace=off/on - enable stacks collection (default: on for mode=full, otherwise off) - kasan.fault=report/panic - only report tag fault or also panic (default: report) If kasan.mode parameter is not provided, it defaults to full when CONFIG_DEBUG_KERNEL is enabled, and to prod otherwise. It is essential that switching between these modes doesn't require rebuilding the kernel with different configs, as this is required by the Android GKI (Generic Kernel Image) initiative. === Benchmarks For now I've only performed a few simple benchmarks such as measuring kernel boot time and slab memory usage after boot. There's an upcoming patchset which will optimize KASAN further and include more detailed benchmarking results. The benchmarks were performed in QEMU and the results below exclude the slowdown caused by QEMU memory tagging emulation (as it's different from the slowdown that will be introduced by hardware and is therefore irrelevant). KASAN_HW_TAGS=y + kasan.mode=off introduces no performance or memory impact compared to KASAN_HW_TAGS=n. kasan.mode=prod (manually excluding tagging) introduces 3% of performance and no memory impact (except memory used by hardware to store tags) compared to kasan.mode=off. kasan.mode=full has about 40% performance and 30% memory impact over kasan.mode=prod. Both come from alloc/free stack collection. === Notes This patchset is available here: https://github.com/xairy/linux/tree/up-boot-mte-v4 This patchset is based on v11 of "kasan: add hardware tag-based mode for arm64" patchset [1]. For testing in QEMU hardware tag-based KASAN requires: 1. QEMU built from master [6] (use "-machine virt,mte=on -cpu max" arguments to run). 2. GCC version 10. [1] https://lore.kernel.org/linux-arm-kernel/cover.1606161801.git.andreyknvl@google.com/T/#t [2] https://community.arm.com/developer/ip-products/processors/b/processors-ip-blog/posts/enhancing-memory-safety [3] https://arxiv.org/pdf/1802.09517.pdf [4] https://github.com/microsoft/MSRC-Security-Research/blob/master/papers/2020/Security%20analysis%20of%20memory%20tagging.pdf [5] https://source.android.com/devices/architecture/kernel/generic-kernel-image [6] https://github.com/qemu/qemu === Tags Tested-by: -
Vincenzo Frascino authored
This test is specific to MTE and verifies that the GCR_EL1 register is context switched correctly. It spawns 1024 processes and each process spawns 5 threads. Each thread writes a random setting of GCR_EL1 through the prctl() system call and reads it back verifying that it is the same. If the values are not the same it reports a failure. Note: The test has been extended to verify that even SYNC and ASYNC mode setting is preserved correctly over context switching. Link: https://lkml.kernel.org/r/b51a165426e906e7ec8a68d806ef3f8cd92581a6.1606161801.git.andreyknvl@google.comSigned-off-by:
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Andrey Konovalov authored
Add documentation for hardware tag-based KASAN mode and also add some clarifications for software tag-based mode. Link: https://lkml.kernel.org/r/20ed1d387685e89fc31be068f890f070ef9fd5d5.1606161801.git.andreyknvl@google.comSigned-off-by:
Alexander Potapenko <glider@google.com> Tested-by:
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Andrey Konovalov authored
Hardware tag-based KASAN is now ready, enable the configuration option. Link: https://lkml.kernel.org/r/a6fa50d3bb6b318e05c6389a44095be96442b8b0.1606161801.git.andreyknvl@google.comSigned-off-by:
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Andrey Konovalov authored
Kernel allocator code accesses metadata for slab objects, that may lie out-of-bounds of the object itself, or be accessed when an object is freed. Such accesses trigger tag faults and lead to false-positive reports with hardware tag-based KASAN. Software KASAN modes disable instrumentation for allocator code via KASAN_SANITIZE Makefile macro, and rely on kasan_enable/disable_current() annotations which are used to ignore KASAN reports. With hardware tag-based KASAN neither of those options are available, as it doesn't use compiler instrumetation, no tag faults are ignored, and MTE is disabled after the first one. Instead, reset tags when accessing metadata (currently only for SLUB). Link: https://lkml.kernel.org/r/a0f3cefbc49f34c843b664110842de4db28179d0.1606161801.git.andreyknvl@google.comSigned-off-by:
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Andrey Konovalov authored
Add error reporting for hardware tag-based KASAN. When CONFIG_KASAN_HW_TAGS is enabled, print KASAN report from the arm64 tag fault handler. SAS bits aren't set in ESR for all faults reported in EL1, so it's impossible to find out the size of the access the caused the fault. Adapt KASAN reporting code to handle this case. Link: https://lkml.kernel.org/r/b559c82b6a969afedf53b4694b475f0234067a1a.1606161801.git.andreyknvl@google.comSigned-off-by:
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Andrey Konovalov authored
Provide implementation of KASAN functions required for the hardware tag-based mode. Those include core functions for memory and pointer tagging (tags_hw.c) and bug reporting (report_tags_hw.c). Also adapt common KASAN code to support the new mode. Link: https://lkml.kernel.org/r/cfd0fbede579a6b66755c98c88c108e54f9c56bf.1606161801.git.andreyknvl@google.comSigned-off-by:
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Andrey Konovalov authored
Some #ifdef CONFIG_KASAN checks are only relevant for software KASAN modes (either related to shadow memory or compiler instrumentation). Expand those into CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS. Link: https://lkml.kernel.org/r/e6971e432dbd72bb897ff14134ebb7e169bdcf0c.1606161801.git.andreyknvl@google.comSigned-off-by:
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