1. 17 Oct, 2020 4 commits
    • Linus Torvalds's avatar
      Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma · a1e16bc7
      Linus Torvalds authored
      Pull rdma updates from Jason Gunthorpe:
       "A usual cycle for RDMA with a typical mix of driver and core subsystem
        updates:
      
         - Driver minor changes and bug fixes for mlx5, efa, rxe, vmw_pvrdma,
           hns, usnic, qib, qedr, cxgb4, hns, bnxt_re
      
         - Various rtrs fixes and updates
      
         - Bug fix for mlx4 CM emulation for virtualization scenarios where
           MRA wasn't working right
      
         - Use tracepoints instead of pr_debug in the CM code
      
         - Scrub the locking in ucma and cma to close more syzkaller bugs
      
         - Use tasklet_setup in the subsystem
      
         - Revert the idea that 'destroy' operations are not allowed to fail
           at the driver level. This proved unworkable from a HW perspective.
      
         - Revise how the umem API works so drivers make fewer mistakes using
           it
      
         - XRC support for qedr
      
         - Convert uverbs objects RWQ and MW to new the allocation scheme
      
         - Large queue entry sizes for hns
      
         - Use hmm_range_fault() for mlx5 On Demand Paging
      
         - uverbs APIs to inspect the GID table instead of sysfs
      
         - Move some of the RDMA code for building large page SGLs into
           lib/scatterlist"
      
      * tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma: (191 commits)
        RDMA/ucma: Fix use after free in destroy id flow
        RDMA/rxe: Handle skb_clone() failure in rxe_recv.c
        RDMA/rxe: Move the definitions for rxe_av.network_type to uAPI
        RDMA: Explicitly pass in the dma_device to ib_register_device
        lib/scatterlist: Do not limit max_segment to PAGE_ALIGNED values
        IB/mlx4: Convert rej_tmout radix-tree to XArray
        RDMA/rxe: Fix bug rejecting all multicast packets
        RDMA/rxe: Fix skb lifetime in rxe_rcv_mcast_pkt()
        RDMA/rxe: Remove duplicate entries in struct rxe_mr
        IB/hfi,rdmavt,qib,opa_vnic: Update MAINTAINERS
        IB/rdmavt: Fix sizeof mismatch
        MAINTAINERS: CISCO VIC LOW LATENCY NIC DRIVER
        RDMA/bnxt_re: Fix sizeof mismatch for allocation of pbl_tbl.
        RDMA/bnxt_re: Use rdma_umem_for_each_dma_block()
        RDMA/umem: Move to allocate SG table from pages
        lib/scatterlist: Add support in dynamic allocation of SG table from pages
        tools/testing/scatterlist: Show errors in human readable form
        tools/testing/scatterlist: Rejuvenate bit-rotten test
        RDMA/ipoib: Set rtnl_link_ops for ipoib interfaces
        RDMA/uverbs: Expose the new GID query API to user space
        ...
      a1e16bc7
    • Linus Torvalds's avatar
      Merge tag 'i3c/for-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux · 2a934b38
      Linus Torvalds authored
      Pull i3c updates from Boris Brezillon:
      
       - Fix DAA for the pre-reserved address case
      
       - Fix an error path in the cadence driver
      
      * tag 'i3c/for-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux:
        i3c: master: Fix error return in cdns_i3c_master_probe()
        i3c: master: fix for SETDASA and DAA process
        i3c: master add i3c_master_attach_boardinfo to preserve boardinfo
      2a934b38
    • Linus Torvalds's avatar
      Merge tag 'mtd/for-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux · 6f78b9ac
      Linus Torvalds authored
      Pull MTD updates from Richard Weinberger:
       "NAND core changes:
         - Drop useless 'depends on' in Kconfig
         - Add an extra level in the Kconfig hierarchy
         - Trivial spellings
         - Dynamic allocation of the interface configurations
         - Dropping the default ONFI timing mode
         - Various cleanup (types, structures, naming, comments)
         - Hide the chip->data_interface indirection
         - Add the generic rb-gpios property
         - Add the ->choose_interface_config() hook
         - Introduce nand_choose_best_sdr_timings()
         - Use default values for tPROG_max and tBERS_max
         - Avoid redefining tR_max and tCCS_min
         - Add a helper to find the closest ONFI mode
         - bcm63xx MTD parsers: simplify CFE detection
      
        Raw NAND controller drivers changes:
         - fsl-upm: Deprecation of specific DT properties
         - fsl_upm: Driver rework and cleanup in favor of ->exec_op()
         - Ingenic: Cleanup ARRAY_SIZE() vs sizeof() use
         - brcmnand: ECC error handling on EDU transfers
         - brcmnand: Don't default to EDU transfers
         - qcom: Set BAM mode only if not set already
         - qcom: Avoid write to unavailable register
         - gpio: Driver rework in favor of ->exec_op()
         - tango: ->exec_op() conversion
         - mtk: ->exec_op() conversion
      
        Raw NAND chip drivers changes:
         - toshiba: Implement ->choose_interface_config() for TH58NVG2S3HBAI4
         - toshiba: Implement ->choose_interface_config() for TC58NVG0S3E
         - toshiba: Implement ->choose_interface_config() for TC58TEG5DCLTA00
         - hynix: Implement ->choose_interface_config() for H27UCG8T2ATR-BC
      
        HyperBus changes:
         - DMA support for TI's AM654 HyperBus controller driver.
         - HyperBus frontend driver for Renesas RPC-IF driver.
      
        SPI NOR core changes:
         - Support for Winbond w25q64jwm flash
         - Enable 4K sector support for mx25l12805d
      
        SPI NOR controller drivers changes:
         - intel-spi Add Alder Lake-S PCI ID
      
        MTD Core changes:
         - mtdoops: Don't run panic write twice
         - mtdconcat: Correctly handle panic write
         - Use DEFINE_SHOW_ATTRIBUTE"
      
      * tag 'mtd/for-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux: (76 commits)
        mtd: hyperbus: Fix build failure when only RPCIF_HYPERBUS is enabled
        mtd: hyperbus: add Renesas RPC-IF driver
        Revert "mtd: spi-nor: Prefer asynchronous probe"
        mtd: parsers: bcm63xx: Do not make it modular
        mtd: spear_smi: Enable compile testing
        mtd: maps: vmu-flash: fix typos for struct memcard
        mtd: physmap: Add Baikal-T1 physically mapped ROM support
        mtd: maps: vmu-flash: simplify the return expression of probe_maple_vmu
        mtd: onenand: simplify the return expression of onenand_transfer_auto_oob
        mtd: rawnand: cadence: remove a redundant dev_err call
        mtd: rawnand: ams-delta: Fix non-OF build warning
        mtd: rawnand: Don't overwrite the error code from nand_set_ecc_soft_ops()
        mtd: rawnand: Introduce nand_set_ecc_on_host_ops()
        mtd: rawnand: atmel: Check return values for nand_read_data_op
        mtd: rawnand: vf610: Remove unused function vf610_nfc_transfer_size()
        mtd: rawnand: qcom: Simplify with dev_err_probe()
        mtd: rawnand: marvell: Fix and update kerneldoc
        mtd: rawnand: marvell: Simplify with dev_err_probe()
        mtd: rawnand: gpmi: Simplify with dev_err_probe()
        mtd: rawnand: atmel: Simplify with dev_err_probe()
        ...
      6f78b9ac
    • Linus Torvalds's avatar
      Merge tag 'thermal-v5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux · 5a77b6a0
      Linus Torvalds authored
      Pull thermal updates from Daniel Lezcano:
      
       - Fix Kconfig typo "acces" -> "access" (Colin Ian King)
      
       - Use dev_error_probe() to simplify the error handling on imx and imx8
         platforms (Anson Huang)
      
       - Use dedicated kobj_to_dev() instead of container_of() in the sysfs
         core code (Tian Tao)
      
       - Fix coding style by adding braces to a one line conditional statement
         on rcar (Geert Uytterhoeven)
      
       - Add DT binding documentation for the r8a774e1 platform and update the
         Kconfig description supporting RZ/G2 SoCs (Lad Prabhakar)
      
       - Simplify the return expression of stm_thermal_prepare on the stm32
         platform (Qinglang Miao)
      
       - Fix the unit in the function documentation for the idle injection
         cooling device (Zhuguang Qing)
      
       - Remove an unecessary mutex_init() in the core code (Qinglang Miao)
      
       - Add support for keep alive events in the core code and the specific
         int340x (Srinivas Pandruvada)
      
       - Remove unused thermal zone variable in devfreq and cpufreq cooling
         devices (Zhuguang Qing)
      
       - Add the A100's THS controller support (Yangtao Li)
      
       - Add power management on the omap3's bandgap sensor (Adam Ford)
      
       - Fix a missing nlmsg_free in the netlink core error path (Jing
         Xiangfeng)
      
      * tag 'thermal-v5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux:
        thermal: core: Adding missing nlmsg_free() in thermal_genl_sampling_temp()
        thermal: ti-soc-thermal: Enable addition power management
        thermal: sun8i: Add A100's THS controller support
        thermal: sun8i: add TEMP_CALIB_MASK for calibration data in sun50i_h6_ths_calibrate
        dt-bindings: thermal: sun8i: Add binding for A100's THS controller
        thermal: cooling: Remove unused variable *tz
        thermal: int340x: Add keep alive response method
        thermal: core: Add new event for sending keep alive notifications
        thermal: int340x: Provide notification for OEM variable change
        thermal: core: remove unnecessary mutex_init()
        thermal/idle_inject: Fix comment of idle_duration_us and name of latency_ns
        thermal: Kconfig: Update description for RCAR_GEN3_THERMAL config
        thermal: stm32: simplify the return expression of stm_thermal_prepare()
        dt-bindings: thermal: rcar-gen3-thermal: Add r8a774e1 support
        thermal: rcar_thermal: Add missing braces to conditional statement
        thermal: Use kobj_to_dev() instead of container_of()
        thermal: imx8mm: Use dev_err_probe() to simplify error handling
        thermal: imx: Use dev_err_probe() to simplify error handling
        drivers: thermal: Kconfig: fix spelling mistake "acces" -> "access"
      5a77b6a0
  2. 16 Oct, 2020 36 commits
    • Linus Torvalds's avatar
      Merge tag 'ovl-update-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs · 071a0578
      Linus Torvalds authored
      Pull overlayfs updates from Miklos Szeredi:
      
       - Improve performance for certain container setups by introducing a
         "volatile" mode
      
       - ioctl improvements
      
       - continue preparation for unprivileged overlay mounts
      
      * tag 'ovl-update-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs:
        ovl: use generic vfs_ioc_setflags_prepare() helper
        ovl: support [S|G]ETFLAGS and FS[S|G]ETXATTR ioctls for directories
        ovl: rearrange ovl_can_list()
        ovl: enumerate private xattrs
        ovl: pass ovl_fs down to functions accessing private xattrs
        ovl: drop flags argument from ovl_do_setxattr()
        ovl: adhere to the vfs_ vs. ovl_do_ conventions for xattrs
        ovl: use ovl_do_getxattr() for private xattr
        ovl: fold ovl_getxattr() into ovl_get_redirect_xattr()
        ovl: clean up ovl_getxattr() in copy_up.c
        duplicate ovl_getxattr()
        ovl: provide a mount option "volatile"
        ovl: check for incompatible features in work dir
      071a0578
    • Linus Torvalds's avatar
      Merge tag 'afs-fixes-20201016' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs · fad70111
      Linus Torvalds authored
      Pull afs updates from David Howells:
       "A collection of fixes to fix afs_cell struct refcounting, thereby
        fixing a slew of related syzbot bugs:
      
         - Fix the cell tree in the netns to use an rwsem rather than RCU.
      
           There seem to be some problems deriving from the use of RCU and a
           seqlock to walk the rbtree, but it's not entirely clear what since
           there are several different failures being seen.
      
           Changing things to use an rwsem instead makes it more robust. The
           extra performance derived from using RCU isn't necessary in this
           case since the only time we're looking up a cell is during mount or
           when cells are being manually added.
      
         - Fix the refcounting by splitting the usage counter into a memory
           refcount and an active users counter. The usage counter was doing
           double duty, keeping track of whether a cell is still in use and
           keeping track of when it needs to be destroyed - but this makes the
           clean up tricky. Separating these out simplifies the logic.
      
         - Fix purging a cell that has an alias. A cell alias pins the cell
           it's an alias of, but the alias is always later in the list. Trying
           to purge in a single pass causes rmmod to hang in such a case.
      
         - Fix cell removal. If a cell's manager is requeued whilst it's
           removing itself, the manager will run again and re-remove itself,
           causing problems in various places. Follow Hillf Danton's
           suggestion to insert a more terminal state that causes the manager
           to do nothing post-removal.
      
        In additional to the above, two other changes:
      
         - Add a tracepoint for the cell refcount and active users count. This
           helped with debugging the above and may be useful again in future.
      
         - Downgrade an assertion to a print when a still-active server is
           seen during purging. This was happening as a consequence of
           incomplete cell removal before the servers were cleaned up"
      
      * tag 'afs-fixes-20201016' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
        afs: Don't assert on unpurgeable server records
        afs: Add tracing for cell refcount and active user count
        afs: Fix cell removal
        afs: Fix cell purging with aliases
        afs: Fix cell refcounting by splitting the usage counter
        afs: Fix rapid cell addition/removal by not using RCU on cells tree
      fad70111
    • Linus Torvalds's avatar
      Merge tag 'f2fs-for-5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs · 7a3daded
      Linus Torvalds authored
      Pull f2fs updates from Jaegeuk Kim:
       "In this round, we've added new features such as zone capacity for ZNS
        and a new GC policy, ATGC, along with in-memory segment management. In
        addition, we could improve the decompression speed significantly by
        changing virtual mapping method. Even though we've fixed lots of small
        bugs in compression support, I feel that it becomes more stable so
        that I could give it a try in production.
      
        Enhancements:
         - suport zone capacity in NVMe Zoned Namespace devices
         - introduce in-memory current segment management
         - add standart casefolding support
         - support age threshold based garbage collection
         - improve decompression speed by changing virtual mapping method
      
        Bug fixes:
         - fix condition checks in some ioctl() such as compression, move_range, etc
         - fix 32/64bits support in data structures
         - fix memory allocation in zstd decompress
         - add some boundary checks to avoid kernel panic on corrupted image
         - fix disallowing compression for non-empty file
         - fix slab leakage of compressed block writes
      
        In addition, it includes code refactoring for better readability and
        minor bug fixes for compression and zoned device support"
      
      * tag 'f2fs-for-5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (51 commits)
        f2fs: code cleanup by removing unnecessary check
        f2fs: wait for sysfs kobject removal before freeing f2fs_sb_info
        f2fs: fix writecount false positive in releasing compress blocks
        f2fs: introduce check_swap_activate_fast()
        f2fs: don't issue flush in f2fs_flush_device_cache() for nobarrier case
        f2fs: handle errors of f2fs_get_meta_page_nofail
        f2fs: fix to set SBI_NEED_FSCK flag for inconsistent inode
        f2fs: reject CASEFOLD inode flag without casefold feature
        f2fs: fix memory alignment to support 32bit
        f2fs: fix slab leak of rpages pointer
        f2fs: compress: fix to disallow enabling compress on non-empty file
        f2fs: compress: introduce cic/dic slab cache
        f2fs: compress: introduce page array slab cache
        f2fs: fix to do sanity check on segment/section count
        f2fs: fix to check segment boundary during SIT page readahead
        f2fs: fix uninit-value in f2fs_lookup
        f2fs: remove unneeded parameter in find_in_block()
        f2fs: fix wrong total_sections check and fsmeta check
        f2fs: remove duplicated code in sanity_check_area_boundary
        f2fs: remove unused check on version_bitmap
        ...
      7a3daded
    • Linus Torvalds's avatar
      Merge tag 'docs/v5.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media · 54a4c789
      Linus Torvalds authored
      Pull documentation updates from Mauro Carvalho Chehab:
       "A series of patches addressing warnings produced by make htmldocs.
        This includes:
      
         - kernel-doc markup fixes
      
         - ReST fixes
      
         - Updates at the build system in order to support newer versions of
           the docs build toolchain (Sphinx)
      
        After this series, the number of html build warnings should reduce
        significantly, and building with Sphinx 3.1 or later should now be
        supported (although it is still recommended to use Sphinx 2.4.4).
      
        As agreed with Jon, I should be sending you a late pull request by the
        end of the merge window addressing remaining issues with docs build,
        as there are a number of warning fixes that depends on pull requests
        that should be happening along the merge window.
      
        The end goal is to have a clean htmldocs build on Kernel 5.10.
      
        PS. It should be noticed that Sphinx 3.0 is not currently supported,
        as it lacks support for C domain namespaces. Such feature, needed in
        order to document uAPI system calls with Sphinx 3.x, was added only on
        Sphinx 3.1"
      
      * tag 'docs/v5.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (75 commits)
        PM / devfreq: remove a duplicated kernel-doc markup
        mm/doc: fix a literal block markup
        workqueue: fix a kernel-doc warning
        docs: virt: user_mode_linux_howto_v2.rst: fix a literal block markup
        Input: sparse-keymap: add a description for @sw
        rcu/tree: docs: document bkvcache new members at struct kfree_rcu_cpu
        nl80211: docs: add a description for s1g_cap parameter
        usb: docs: document altmode register/unregister functions
        kunit: test.h: fix a bad kernel-doc markup
        drivers: core: fix kernel-doc markup for dev_err_probe()
        docs: bio: fix a kerneldoc markup
        kunit: test.h: solve kernel-doc warnings
        block: bio: fix a warning at the kernel-doc markups
        docs: powerpc: syscall64-abi.rst: fix a malformed table
        drivers: net: hamradio: fix document location
        net: appletalk: Kconfig: Fix docs location
        dt-bindings: fix references to files converted to yaml
        memblock: get rid of a :c:type leftover
        math64.h: kernel-docs: Convert some markups into normal comments
        media: uAPI: buffer.rst: remove a left-over documentation
        ...
      54a4c789
    • Linus Torvalds's avatar
      Merge tag 'trace-v5.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace · 93f3d8f5
      Linus Torvalds authored
      Pull tracing fix from Steven Rostedt:
       "Fix mismatch section of adding early trace events.
      
        Fixes the issue of a mismatch section that was missed due to gcc
        inlining the offending function, while clang did not (and reported the
        issue)"
      
      * tag 'trace-v5.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
        tracing: Remove __init from __trace_early_add_new_event()
      93f3d8f5
    • Linus Torvalds's avatar
      Merge tag 'printk-for-5.10-fixup' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux · 8119c433
      Linus Torvalds authored
      Pull printk fix from Petr Mladek:
       "Prevent overflow in the new lockless ringbuffer"
      
      * tag 'printk-for-5.10-fixup' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux:
        printk: ringbuffer: Wrong data pointer when appending small string
      8119c433
    • Linus Torvalds's avatar
      Merge tag 'kgdb-5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux · 49dc6fbc
      Linus Torvalds authored
      Pull kgdb updates from Daniel Thompson:
       "A fairly modest set of changes for this cycle.
      
        Of particular note are an earlycon fix from Doug Anderson and my own
        changes to get kgdb/kdb to honour the kprobe blocklist. The later
        creates a safety rail that strongly encourages developers not to place
        breakpoints in, for example, arch specific trap handling code.
      
        Also included are a couple of small fixes and tweaks: an API update,
        eliminate a coverity dead code warning, improved handling of search
        during multi-line printk and a couple of typo corrections"
      
      * tag 'kgdb-5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux:
        kdb: Fix pager search for multi-line strings
        kernel: debug: Centralize dbg_[de]activate_sw_breakpoints
        kgdb: Add NOKPROBE labels on the trap handler functions
        kgdb: Honour the kprobe blocklist when setting breakpoints
        kernel/debug: Fix spelling mistake in debug_core.c
        kdb: Use newer api for tasklist scanning
        kgdb: Make "kgdbcon" work properly with "kgdb_earlycon"
        kdb: remove unnecessary null check of dbg_io_ops
      49dc6fbc
    • Linus Torvalds's avatar
      Merge tag 'mips_5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux · 09a31a7e
      Linus Torvalds authored
      Pull MIPS updates from Thomas Bogendoerfer:
      
       - removed support for PNX833x alias NXT_STB22x
      
       - included Ingenic SoC support into generic MIPS kernels
      
       - added support for new Ingenic SoCs
      
       - converted workaround selection to use Kconfig
      
       - replaced old boot mem functions by memblock_*
      
       - enabled COP2 usage in kernel for Loongson64 to make use
         of 16byte load/stores possible
      
       - cleanups and fixes
      
      * tag 'mips_5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: (92 commits)
        MIPS: DEC: Restore bootmem reservation for firmware working memory area
        MIPS: dec: fix section mismatch
        bcm963xx_tag.h: fix duplicated word
        mips: ralink: enable zboot support
        MIPS: ingenic: Remove CPU_SUPPORTS_HUGEPAGES
        MIPS: cpu-probe: remove MIPS_CPU_BP_GHIST option bit
        MIPS: cpu-probe: introduce exclusive R3k CPU probe
        MIPS: cpu-probe: move fpu probing/handling into its own file
        MIPS: replace add_memory_region with memblock
        MIPS: Loongson64: Clean up numa.c
        MIPS: Loongson64: Select SMP in Kconfig to avoid build error
        mips: octeon: Add Ubiquiti E200 and E220 boards
        MIPS: SGI-IP28: disable use of ll/sc in kernel
        MIPS: tx49xx: move tx4939_add_memory_regions into only user
        MIPS: pgtable: Remove used PAGE_USERIO define
        MIPS: alchemy: Share prom_init implementation
        MIPS: alchemy: Fix build breakage, if TOUCHSCREEN_WM97XX is disabled
        MIPS: process: include exec.h header in process.c
        MIPS: process: Add prototype for function arch_dup_task_struct
        MIPS: idle: Add prototype for function check_wait
        ...
      09a31a7e
    • Linus Torvalds's avatar
      Merge tag 's390-5.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux · 847d4287
      Linus Torvalds authored
      Pull s390 updates from Vasily Gorbik:
      
       - Remove address space overrides using set_fs()
      
       - Convert to generic vDSO
      
       - Convert to generic page table dumper
      
       - Add ARCH_HAS_DEBUG_WX support
      
       - Add leap seconds handling support
      
       - Add NVMe firmware-assisted kernel dump support
      
       - Extend NVMe boot support with memory clearing control and addition of
         kernel parameters
      
       - AP bus and zcrypt api code rework. Add adapter configure/deconfigure
         interface. Extend debug features. Add failure injection support
      
       - Add ECC secure private keys support
      
       - Add KASan support for running protected virtualization host with
         4-level paging
      
       - Utilize destroy page ultravisor call to speed up secure guests
         shutdown
      
       - Implement ioremap_wc() and ioremap_prot() with MIO in PCI code
      
       - Various checksum improvements
      
       - Other small various fixes and improvements all over the code
      
      * tag 's390-5.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (85 commits)
        s390/uaccess: fix indentation
        s390/uaccess: add default cases for __put_user_fn()/__get_user_fn()
        s390/zcrypt: fix wrong format specifications
        s390/kprobes: move insn_page to text segment
        s390/sie: fix typo in SIGP code description
        s390/lib: fix kernel doc for memcmp()
        s390/zcrypt: Introduce Failure Injection feature
        s390/zcrypt: move ap_msg param one level up the call chain
        s390/ap/zcrypt: revisit ap and zcrypt error handling
        s390/ap: Support AP card SCLP config and deconfig operations
        s390/sclp: Add support for SCLP AP adapter config/deconfig
        s390/ap: add card/queue deconfig state
        s390/ap: add error response code field for ap queue devices
        s390/ap: split ap queue state machine state from device state
        s390/zcrypt: New config switch CONFIG_ZCRYPT_DEBUG
        s390/zcrypt: introduce msg tracking in zcrypt functions
        s390/startup: correct early pgm check info formatting
        s390: remove orphaned extern variables declarations
        s390/kasan: make sure int handler always run with DAT on
        s390/ipl: add support to control memory clearing for nvme re-IPL
        ...
      847d4287
    • Linus Torvalds's avatar
      Merge tag 'powerpc-5.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux · 96685f86
      Linus Torvalds authored
      Pull powerpc updates from Michael Ellerman:
      
       - A series from Nick adding ARCH_WANT_IRQS_OFF_ACTIVATE_MM & selecting
         it for powerpc, as well as a related fix for sparc.
      
       - Remove support for PowerPC 601.
      
       - Some fixes for watchpoints & addition of a new ptrace flag for
         detecting ISA v3.1 (Power10) watchpoint features.
      
       - A fix for kernels using 4K pages and the hash MMU on bare metal
         Power9 systems with > 16TB of RAM, or RAM on the 2nd node.
      
       - A basic idle driver for shallow stop states on Power10.
      
       - Tweaks to our sched domains code to better inform the scheduler about
         the hardware topology on Power9/10, where two SMT4 cores can be
         presented by firmware as an SMT8 core.
      
       - A series doing further reworks & cleanups of our EEH code.
      
       - Addition of a filter for RTAS (firmware) calls done via sys_rtas(),
         to prevent root from overwriting kernel memory.
      
       - Other smaller features, fixes & cleanups.
      
      Thanks to: Alexey Kardashevskiy, Andrew Donnellan, Aneesh Kumar K.V,
      Athira Rajeev, Biwen Li, Cameron Berkenpas, Cédric Le Goater, Christophe
      Leroy, Christoph Hellwig, Colin Ian King, Daniel Axtens, David Dai, Finn
      Thain, Frederic Barrat, Gautham R. Shenoy, Greg Kurz, Gustavo Romero,
      Ira Weiny, Jason Yan, Joel Stanley, Jordan Niethe, Kajol Jain, Konrad
      Rzeszutek Wilk, Laurent Dufour, Leonardo Bras, Liu Shixin, Luca
      Ceresoli, Madhavan Srinivasan, Mahesh Salgaonkar, Nathan Lynch, Nicholas
      Mc Guire, Nicholas Piggin, Nick Desaulniers, Oliver O'Halloran, Pedro
      Miraglia Franco de Carvalho, Pratik Rajesh Sampat, Qian Cai, Qinglang
      Miao, Ravi Bangoria, Russell Currey, Satheesh Rajendran, Scott Cheloha,
      Segher Boessenkool, Srikar Dronamraju, Stan Johnson, Stephen Kitt,
      Stephen Rothwell, Thiago Jung Bauermann, Tyrel Datwyler, Vaibhav Jain,
      Vaidyanathan Srinivasan, Vasant Hegde, Wang Wensheng, Wolfram Sang, Yang
      Yingliang, zhengbin.
      
      * tag 'powerpc-5.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (228 commits)
        Revert "powerpc/pci: unmap legacy INTx interrupts when a PHB is removed"
        selftests/powerpc: Fix eeh-basic.sh exit codes
        cpufreq: powernv: Fix frame-size-overflow in powernv_cpufreq_reboot_notifier
        powerpc/time: Make get_tb() common to PPC32 and PPC64
        powerpc/time: Make get_tbl() common to PPC32 and PPC64
        powerpc/time: Remove get_tbu()
        powerpc/time: Avoid using get_tbl() and get_tbu() internally
        powerpc/time: Make mftb() common to PPC32 and PPC64
        powerpc/time: Rename mftbl() to mftb()
        powerpc/32s: Remove #ifdef CONFIG_PPC_BOOK3S_32 in head_book3s_32.S
        powerpc/32s: Rename head_32.S to head_book3s_32.S
        powerpc/32s: Setup the early hash table at all time.
        powerpc/time: Remove ifdef in get_dec() and set_dec()
        powerpc: Remove get_tb_or_rtc()
        powerpc: Remove __USE_RTC()
        powerpc: Tidy up a bit after removal of PowerPC 601.
        powerpc: Remove support for PowerPC 601
        powerpc: Remove PowerPC 601
        powerpc: Drop SYNC_601() ISYNC_601() and SYNC()
        powerpc: Remove CONFIG_PPC601_SYNC_FIX
        ...
      96685f86
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew) · c4cf498d
      Linus Torvalds authored
      Merge more updates from Andrew Morton:
       "155 patches.
      
        Subsystems affected by this patch series: mm (dax, debug, thp,
        readahead, page-poison, util, memory-hotplug, zram, cleanups), misc,
        core-kernel, get_maintainer, MAINTAINERS, lib, bitops, checkpatch,
        binfmt, ramfs, autofs, nilfs, rapidio, panic, relay, kgdb, ubsan,
        romfs, and fault-injection"
      
      * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (155 commits)
        lib, uaccess: add failure injection to usercopy functions
        lib, include/linux: add usercopy failure capability
        ROMFS: support inode blocks calculation
        ubsan: introduce CONFIG_UBSAN_LOCAL_BOUNDS for Clang
        sched.h: drop in_ubsan field when UBSAN is in trap mode
        scripts/gdb/tasks: add headers and improve spacing format
        scripts/gdb/proc: add struct mount & struct super_block addr in lx-mounts command
        kernel/relay.c: drop unneeded initialization
        panic: dump registers on panic_on_warn
        rapidio: fix the missed put_device() for rio_mport_add_riodev
        rapidio: fix error handling path
        nilfs2: fix some kernel-doc warnings for nilfs2
        autofs: harden ioctl table
        ramfs: fix nommu mmap with gaps in the page cache
        mm: remove the now-unnecessary mmget_still_valid() hack
        mm/gup: take mmap_lock in get_dump_page()
        binfmt_elf, binfmt_elf_fdpic: use a VMA list snapshot
        coredump: rework elf/elf_fdpic vma_dump_size() into common helper
        coredump: refactor page range dumping into common helper
        coredump: let dump_emit() bail out on short writes
        ...
      c4cf498d
    • Albert van der Linde's avatar
      lib, uaccess: add failure injection to usercopy functions · 4d0e9df5
      Albert van der Linde authored
      To test fault-tolerance of user memory access functions, introduce fault
      injection to usercopy functions.
      
      If a failure is expected return either -EFAULT or the total amount of
      bytes that were not copied.
      Signed-off-by: default avatarAlbert van der Linde <alinde@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Reviewed-by: default avatarAkinobu Mita <akinobu.mita@gmail.com>
      Reviewed-by: default avatarAlexander Potapenko <glider@google.com>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Andrey Konovalov <andreyknvl@google.com>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Dmitry Vyukov <dvyukov@google.com>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Jonathan Corbet <corbet@lwn.net>
      Cc: Marco Elver <elver@google.com>
      Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Christoph Hellwig <hch@lst.de>
      Link: http://lkml.kernel.org/r/20200831171733.955393-3-alinde@google.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      4d0e9df5
    • Albert van der Linde's avatar
      lib, include/linux: add usercopy failure capability · 2c739ced
      Albert van der Linde authored
      Patch series "add fault injection to user memory access", v3.
      
      The goal of this series is to improve testing of fault-tolerance in usages
      of user memory access functions, by adding support for fault injection.
      
      syzkaller/syzbot are using the existing fault injection modes and will use
      this particular feature also.
      
      The first patch adds failure injection capability for usercopy functions.
      The second changes usercopy functions to use this new failure capability
      (copy_from_user, ...).  The third patch adds get/put/clear_user failures
      to x86.
      
      This patch (of 3):
      
      Add a failure injection capability to improve testing of fault-tolerance
      in usages of user memory access functions.
      
      Add CONFIG_FAULT_INJECTION_USERCOPY to enable faults in usercopy
      functions.  The should_fail_usercopy function is to be called by these
      functions (copy_from_user, get_user, ...) in order to fail or not.
      Signed-off-by: default avatarAlbert van der Linde <alinde@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Reviewed-by: default avatarAkinobu Mita <akinobu.mita@gmail.com>
      Reviewed-by: default avatarAlexander Potapenko <glider@google.com>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Jonathan Corbet <corbet@lwn.net>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Andrey Konovalov <andreyknvl@google.com>
      Cc: Dmitry Vyukov <dvyukov@google.com>
      Cc: Marco Elver <elver@google.com>
      Cc: Christoph Hellwig <hch@lst.de>
      Link: http://lkml.kernel.org/r/20200831171733.955393-1-alinde@google.com
      Link: http://lkml.kernel.org/r/20200831171733.955393-2-alinde@google.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      2c739ced
    • Libing Zhou's avatar
      ROMFS: support inode blocks calculation · d9bc85de
      Libing Zhou authored
      When use 'stat' tool to display file status, the 'Blocks' field always in
      '0', this is not good for tool 'du'(e.g.: busybox 'du'), it always output
      '0' size for the files under ROMFS since such tool calculates number of
      512B Blocks.
      
      This patch calculates approx.  number of 512B blocks based on inode size.
      Signed-off-by: default avatarLibing Zhou <libing.zhou@nokia-sbell.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Link: http://lkml.kernel.org/r/20200811052606.4243-1-libing.zhou@nokia-sbell.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d9bc85de
    • George Popescu's avatar
      ubsan: introduce CONFIG_UBSAN_LOCAL_BOUNDS for Clang · 6a6155f6
      George Popescu authored
      When the kernel is compiled with Clang, -fsanitize=bounds expands to
      -fsanitize=array-bounds and -fsanitize=local-bounds.
      
      Enabling -fsanitize=local-bounds with Clang has the unfortunate
      side-effect of inserting traps; this goes back to its original intent,
      which was as a hardening and not a debugging feature [1].  The same
      feature made its way into -fsanitize=bounds, but the traps remained.  For
      that reason, -fsanitize=bounds was split into 'array-bounds' and
      'local-bounds' [2].
      
      Since 'local-bounds' doesn't behave like a normal sanitizer, enable it
      with Clang only if trapping behaviour was requested by
      CONFIG_UBSAN_TRAP=y.
      
      Add the UBSAN_BOUNDS_LOCAL config to Kconfig.ubsan to enable the
      'local-bounds' option by default when UBSAN_TRAP is enabled.
      
      [1] http://lists.llvm.org/pipermail/llvm-dev/2012-May/049972.html
      [2] http://lists.llvm.org/pipermail/cfe-commits/Week-of-Mon-20131021/091536.htmlSuggested-by: default avatarMarco Elver <elver@google.com>
      Signed-off-by: default avatarGeorge Popescu <georgepope@android.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Reviewed-by: default avatarDavid Brazdil <dbrazdil@google.com>
      Reviewed-by: default avatarMarco Elver <elver@google.com>
      Cc: Masahiro Yamada <masahiroy@kernel.org>
      Cc: Michal Marek <michal.lkml@markovi.net>
      Cc: Nathan Chancellor <natechancellor@gmail.com>
      Cc: Nick Desaulniers <ndesaulniers@google.com>
      Cc: Kees Cook <keescook@chromium.org>
      Cc: Dmitry Vyukov <dvyukov@google.com>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Link: https://lkml.kernel.org/r/20200922074330.2549523-1-georgepope@google.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      6a6155f6
    • Elena Petrova's avatar
      sched.h: drop in_ubsan field when UBSAN is in trap mode · 5cf53f3c
      Elena Petrova authored
      in_ubsan field of task_struct is only used in lib/ubsan.c, which in its
      turn is used only `ifneq ($(CONFIG_UBSAN_TRAP),y)`.
      
      Removing unnecessary field from a task_struct will help preserve the ABI
      between vanilla and CONFIG_UBSAN_TRAP'ed kernels.  In particular, this
      will help enabling bounds sanitizer transparently for Android's GKI.
      Signed-off-by: default avatarElena Petrova <lenaptr@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Acked-by: default avatarKees Cook <keescook@chromium.org>
      Cc: Jann Horn <jannh@google.com>
      Link: https://lkml.kernel.org/r/20200910134802.3160311-1-lenaptr@google.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5cf53f3c
    • Ritesh Harjani's avatar
      scripts/gdb/tasks: add headers and improve spacing format · 4fbe310e
      Ritesh Harjani authored
      With the patch.
      <e.g. o/p>
            TASK          PID    COMM
      0xffffffff82c2b8c0   0   swapper/0
      0xffff888a0ba20040   1   systemd
      0xffff888a0ba24040   2   kthreadd
      0xffff888a0ba28040   3   rcu_gp
      
      w/o
      0xffffffff82c2b8c0 <init_task> 0 swapper/0
      0xffff888a0ba20040 1 systemd
      0xffff888a0ba24040 2 kthreadd
      0xffff888a0ba28040 3 rcu_gp
      Signed-off-by: default avatarRitesh Harjani <riteshh@linux.ibm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Reviewed-by: default avatarJan Kiszka <jan.kiszka@siemens.com>
      Cc: Kieran Bingham <kbingham@kernel.org>
      Link: http://lkml.kernel.org/r/54c868c79b5fc364a8be7799891934a6fe6d1464.1597742951.git.riteshh@linux.ibm.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      4fbe310e
    • Ritesh Harjani's avatar
      scripts/gdb/proc: add struct mount & struct super_block addr in lx-mounts command · 998ec76b
      Ritesh Harjani authored
      This is many times found useful while debugging some FS related
      issue.
      
      <e.g. output>
            mount          super_block     devname pathname fstype options
      0xffff888a0bfa4b40 0xffff888a0bfc1000 none / rootfs rw 0 0
      0xffff888a033f75c0 0xffff8889fcf65000 /dev/root / ext4 rw,relatime 0 0
      0xffff8889fc8ce040 0xffff888a0bb51000 devtmpfs /dev devtmpfs rw,relatime 0 0
      Signed-off-by: default avatarRitesh Harjani <riteshh@linux.ibm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Reviewed-by: default avatarJan Kiszka <jan.kiszka@siemens.com>
      Cc: Kieran Bingham <kbingham@kernel.org>
      Link: http://lkml.kernel.org/r/a3c4177e1597b3e06d66d55e07d72c0c46a03571.1597742951.git.riteshh@linux.ibm.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      998ec76b
    • Sudip Mukherjee's avatar
      kernel/relay.c: drop unneeded initialization · ac05b7a1
      Sudip Mukherjee authored
      The variable 'consumed' is initialized with the consumed count but
      immediately after that the consumed count is updated and assigned to
      'consumed' again thus overwriting the previous value.  So, drop the
      unneeded initialization.
      Signed-off-by: default avatarSudip Mukherjee <sudipm.mukherjee@gmail.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Reviewed-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Link: https://lkml.kernel.org/r/20201005205727.1147-1-sudipm.mukherjee@gmail.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      ac05b7a1
    • Alexey Kardashevskiy's avatar
      panic: dump registers on panic_on_warn · 3f388f28
      Alexey Kardashevskiy authored
      Currently we print stack and registers for ordinary warnings but we do not
      for panic_on_warn which looks as oversight - panic() will reboot the
      machine but won't print registers.
      
      This moves printing of registers and modules earlier.
      
      This does not move the stack dumping as panic() dumps it.
      Signed-off-by: default avatarAlexey Kardashevskiy <aik@ozlabs.ru>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Reviewed-by: default avatarKees Cook <keescook@chromium.org>
      Cc: Douglas Anderson <dianders@chromium.org>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Kees Cook <keescook@chromium.org>
      Cc: Rafael Aquini <aquini@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Will Deacon <will@kernel.org>
      Cc: Nicholas Piggin <npiggin@gmail.com>
      Link: https://lkml.kernel.org/r/20200804095054.68724-1-aik@ozlabs.ruSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      3f388f28
    • Jing Xiangfeng's avatar
      rapidio: fix the missed put_device() for rio_mport_add_riodev · 85094c05
      Jing Xiangfeng authored
      rio_mport_add_riodev() misses to call put_device() when the device already
      exists.  Add the missed function call to fix it.
      
      Fixes: e8de3701 ("rapidio: add mport char device driver")
      Signed-off-by: default avatarJing Xiangfeng <jingxiangfeng@huawei.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Reviewed-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
      Cc: Matt Porter <mporter@kernel.crashing.org>
      Cc: Alexandre Bounine <alex.bou9@gmail.com>
      Cc: Gustavo A. R. Silva <gustavoars@kernel.org>
      Cc: John Hubbard <jhubbard@nvidia.com>
      Cc: Kees Cook <keescook@chromium.org>
      Cc: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
      Link: https://lkml.kernel.org/r/20200922072525.42330-1-jingxiangfeng@huawei.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      85094c05
    • Souptick Joarder's avatar
      rapidio: fix error handling path · fa63f083
      Souptick Joarder authored
      rio_dma_transfer() attempts to clamp the return value of
      pin_user_pages_fast() to be >= 0.  However, the attempt fails because
      nr_pages is overridden a few lines later, and restored to the undesirable
      -ERRNO value.
      
      The return value is ultimately stored in nr_pages, which in turn is passed
      to unpin_user_pages(), which expects nr_pages >= 0, else, disaster.
      
      Fix this by fixing the nesting of the assignment to nr_pages: nr_pages
      should be clamped to zero if pin_user_pages_fast() returns -ERRNO, or set
      to the return value of pin_user_pages_fast(), otherwise.
      
      [jhubbard@nvidia.com: new changelog]
      
      Fixes: e8de3701 ("rapidio: add mport char device driver")
      Signed-off-by: default avatarSouptick Joarder <jrdr.linux@gmail.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Reviewed-by: default avatarIra Weiny <ira.weiny@intel.com>
      Reviewed-by: default avatarJohn Hubbard <jhubbard@nvidia.com>
      Cc: Matthew Wilcox <willy@infradead.org>
      Cc: Matt Porter <mporter@kernel.crashing.org>
      Cc: Alexandre Bounine <alex.bou9@gmail.com>
      Cc: Gustavo A. R. Silva <gustavoars@kernel.org>
      Cc: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
      Cc: Dan Carpenter <dan.carpenter@oracle.com>
      Link: https://lkml.kernel.org/r/1600227737-20785-1-git-send-email-jrdr.linux@gmail.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      fa63f083
    • Wang Hai's avatar
      nilfs2: fix some kernel-doc warnings for nilfs2 · 64ead520
      Wang Hai authored
      Fixes the following W=1 kernel build warning(s):
      
      fs/nilfs2/bmap.c:378: warning: Excess function parameter 'bhp' description in 'nilfs_bmap_assign'
      fs/nilfs2/cpfile.c:907: warning: Excess function parameter 'status' description in 'nilfs_cpfile_change_cpmode'
      fs/nilfs2/cpfile.c:946: warning: Excess function parameter 'stat' description in 'nilfs_cpfile_get_stat'
      fs/nilfs2/page.c:76: warning: Excess function parameter 'inode' description in 'nilfs_forget_buffer'
      fs/nilfs2/sufile.c:563: warning: Excess function parameter 'stat' description in 'nilfs_sufile_get_stat'
      Signed-off-by: default avatarWang Hai <wanghai38@huawei.com>
      Signed-off-by: default avatarRyusuke Konishi <konishi.ryusuke@gmail.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Link: https://lkml.kernel.org/r/1601386269-2423-1-git-send-email-konishi.ryusuke@gmail.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      64ead520
    • Matthew Wilcox's avatar
      autofs: harden ioctl table · 589f6b52
      Matthew Wilcox authored
      The table of ioctl functions should be marked const in order to put them
      in read-only memory, and we should use array_index_nospec() to avoid
      speculation disclosing the contents of kernel memory to userspace.
      Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Acked-by: default avatarIan Kent <raven@themaw.net>
      Link: https://lkml.kernel.org/r/20200818122203.GO17456@casper.infradead.orgSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      589f6b52
    • Matthew Wilcox (Oracle)'s avatar
      ramfs: fix nommu mmap with gaps in the page cache · 50b7d856
      Matthew Wilcox (Oracle) authored
      ramfs needs to check that pages are both physically contiguous and
      contiguous in the file.  If the page cache happens to have, eg, page A for
      index 0 of the file, no page for index 1, and page A+1 for index 2, then
      an mmap of the first two pages of the file will succeed when it should
      fail.
      
      Fixes: 642fb4d1 ("[PATCH] NOMMU: Provide shared-writable mmap support on ramfs")
      Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Cc: David Howells <dhowells@redhat.com>
      Link: https://lkml.kernel.org/r/20200914122239.GO6583@casper.infradead.orgSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      50b7d856
    • Jann Horn's avatar
      mm: remove the now-unnecessary mmget_still_valid() hack · 4d45e75a
      Jann Horn authored
      The preceding patches have ensured that core dumping properly takes the
      mmap_lock.  Thanks to that, we can now remove mmget_still_valid() and all
      its users.
      Signed-off-by: default avatarJann Horn <jannh@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Cc: Christoph Hellwig <hch@lst.de>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: "Eric W . Biederman" <ebiederm@xmission.com>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Link: http://lkml.kernel.org/r/20200827114932.3572699-8-jannh@google.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      4d45e75a
    • Jann Horn's avatar
      mm/gup: take mmap_lock in get_dump_page() · 7f3bfab5
      Jann Horn authored
      Properly take the mmap_lock before calling into the GUP code from
      get_dump_page(); and play nice, allowing the GUP code to drop the
      mmap_lock if it has to sleep.
      
      As Linus pointed out, we don't actually need the VMA because
      __get_user_pages() will flush the dcache for us if necessary.
      Signed-off-by: default avatarJann Horn <jannh@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Cc: Christoph Hellwig <hch@lst.de>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: "Eric W . Biederman" <ebiederm@xmission.com>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Link: http://lkml.kernel.org/r/20200827114932.3572699-7-jannh@google.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      7f3bfab5
    • Jann Horn's avatar
      binfmt_elf, binfmt_elf_fdpic: use a VMA list snapshot · a07279c9
      Jann Horn authored
      In both binfmt_elf and binfmt_elf_fdpic, use a new helper
      dump_vma_snapshot() to take a snapshot of the VMA list (including the gate
      VMA, if we have one) while protected by the mmap_lock, and then use that
      snapshot instead of walking the VMA list without locking.
      
      An alternative approach would be to keep the mmap_lock held across the
      entire core dumping operation; however, keeping the mmap_lock locked while
      we may be blocked for an unbounded amount of time (e.g.  because we're
      dumping to a FUSE filesystem or so) isn't really optimal; the mmap_lock
      blocks things like the ->release handler of userfaultfd, and we don't
      really want critical system daemons to grind to a halt just because
      someone "gifted" them SCM_RIGHTS to an eternally-locked userfaultfd, or
      something like that.
      
      Since both the normal ELF code and the FDPIC ELF code need this
      functionality (and if any other binfmt wants to add coredump support in
      the future, they'd probably need it, too), implement this with a common
      helper in fs/coredump.c.
      
      A downside of this approach is that we now need a bigger amount of kernel
      memory per userspace VMA in the normal ELF case, and that we need O(n)
      kernel memory in the FDPIC ELF case at all; but 40 bytes per VMA shouldn't
      be terribly bad.
      
      There currently is a data race between stack expansion and anything that
      reads ->vm_start or ->vm_end under the mmap_lock held in read mode; to
      mitigate that for core dumping, take the mmap_lock in write mode when
      taking a snapshot of the VMA hierarchy.  (If we only took the mmap_lock in
      read mode, we could end up with a corrupted core dump if someone does
      get_user_pages_remote() concurrently.  Not really a major problem, but
      taking the mmap_lock either way works here, so we might as well avoid the
      issue.) (This doesn't do anything about the existing data races with stack
      expansion in other mm code.)
      Signed-off-by: default avatarJann Horn <jannh@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Cc: Christoph Hellwig <hch@lst.de>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: "Eric W . Biederman" <ebiederm@xmission.com>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Link: http://lkml.kernel.org/r/20200827114932.3572699-6-jannh@google.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      a07279c9
    • Jann Horn's avatar
      coredump: rework elf/elf_fdpic vma_dump_size() into common helper · 429a22e7
      Jann Horn authored
      At the moment, the binfmt_elf and binfmt_elf_fdpic code have slightly
      different code to figure out which VMAs should be dumped, and if so,
      whether the dump should contain the entire VMA or just its first page.
      
      Eliminate duplicate code by reworking the binfmt_elf version into a
      generic core dumping helper in coredump.c.
      
      As part of that, change the heuristic for detecting executable/library
      header pages to check whether the inode is executable instead of looking
      at the file mode.
      
      This is less problematic in terms of locking because it lets us avoid
      get_user() under the mmap_sem.  (And arguably it looks nicer and makes
      more sense in generic code.)
      
      Adjust a little bit based on the binfmt_elf_fdpic version: ->anon_vma is
      only meaningful under CONFIG_MMU, otherwise we have to assume that the VMA
      has been written to.
      Suggested-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarJann Horn <jannh@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Cc: Christoph Hellwig <hch@lst.de>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: "Eric W . Biederman" <ebiederm@xmission.com>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Link: http://lkml.kernel.org/r/20200827114932.3572699-5-jannh@google.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      429a22e7
    • Jann Horn's avatar
      coredump: refactor page range dumping into common helper · afc63a97
      Jann Horn authored
      Both fs/binfmt_elf.c and fs/binfmt_elf_fdpic.c need to dump ranges of
      pages into the coredump file.  Extract that logic into a common helper.
      Signed-off-by: default avatarJann Horn <jannh@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Cc: Christoph Hellwig <hch@lst.de>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: "Eric W . Biederman" <ebiederm@xmission.com>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Link: http://lkml.kernel.org/r/20200827114932.3572699-4-jannh@google.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      afc63a97
    • Jann Horn's avatar
      coredump: let dump_emit() bail out on short writes · df0c09c0
      Jann Horn authored
      dump_emit() has a retry loop, but there seems to be no way for that retry
      logic to actually be used; and it was also buggy, writing the same data
      repeatedly after a short write.
      
      Let's just bail out on a short write.
      Suggested-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarJann Horn <jannh@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Cc: Christoph Hellwig <hch@lst.de>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: "Eric W . Biederman" <ebiederm@xmission.com>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Link: http://lkml.kernel.org/r/20200827114932.3572699-3-jannh@google.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      df0c09c0
    • Jann Horn's avatar
      binfmt_elf_fdpic: stop using dump_emit() on user pointers on !MMU · 8f942eea
      Jann Horn authored
      Patch series "Fix ELF / FDPIC ELF core dumping, and use mmap_lock properly in there", v5.
      
      At the moment, we have that rather ugly mmget_still_valid() helper to work
      around <https://crbug.com/project-zero/1790>: ELF core dumping doesn't
      take the mmap_sem while traversing the task's VMAs, and if anything (like
      userfaultfd) then remotely messes with the VMA tree, fireworks ensue.  So
      at the moment we use mmget_still_valid() to bail out in any writers that
      might be operating on a remote mm's VMAs.
      
      With this series, I'm trying to get rid of the need for that as cleanly as
      possible.  ("cleanly" meaning "avoid holding the mmap_lock across
      unbounded sleeps".)
      
      Patches 1, 2, 3 and 4 are relatively unrelated cleanups in the core
      dumping code.
      
      Patches 5 and 6 implement the main change: Instead of repeatedly accessing
      the VMA list with sleeps in between, we snapshot it at the start with
      proper locking, and then later we just use our copy of the VMA list.  This
      ensures that the kernel won't crash, that VMA metadata in the coredump is
      consistent even in the presence of concurrent modifications, and that any
      virtual addresses that aren't being concurrently modified have their
      contents show up in the core dump properly.
      
      The disadvantage of this approach is that we need a bit more memory during
      core dumping for storing metadata about all VMAs.
      
      At the end of the series, patch 7 removes the old workaround for this
      issue (mmget_still_valid()).
      
      I have tested:
      
       - Creating a simple core dump on X86-64 still works.
       - The created coredump on X86-64 opens in GDB and looks plausible.
       - X86-64 core dumps contain the first page for executable mappings at
         offset 0, and don't contain the first page for non-executable file
         mappings or executable mappings at offset !=0.
       - NOMMU 32-bit ARM can still generate plausible-looking core dumps
         through the FDPIC implementation. (I can't test this with GDB because
         GDB is missing some structure definition for nommu ARM, but I've
         poked around in the hexdump and it looked decent.)
      
      This patch (of 7):
      
      dump_emit() is for kernel pointers, and VMAs describe userspace memory.
      Let's be tidy here and avoid accessing userspace pointers under KERNEL_DS,
      even if it probably doesn't matter much on !MMU systems - especially given
      that it looks like we can just use the same get_dump_page() as on MMU if
      we move it out of the CONFIG_MMU block.
      
      One small change we have to make in get_dump_page() is to use
      __get_user_pages_locked() instead of __get_user_pages(), since the latter
      doesn't exist on nommu.  On mmu builds, __get_user_pages_locked() will
      just call __get_user_pages() for us.
      Signed-off-by: default avatarJann Horn <jannh@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Cc: Christoph Hellwig <hch@lst.de>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: "Eric W . Biederman" <ebiederm@xmission.com>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Hugh Dickins <hughd@google.com>
      Link: http://lkml.kernel.org/r/20200827114932.3572699-1-jannh@google.com
      Link: http://lkml.kernel.org/r/20200827114932.3572699-2-jannh@google.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8f942eea
    • Chris Kennelly's avatar
      tools/testing/selftests: add self-test for verifying load alignment · 206e22f0
      Chris Kennelly authored
      This produces a PIE binary with a variety of p_align requirements,
      suitable for verifying that the load address meets that alignment
      requirement.
      Signed-off-by: default avatarChris Kennelly <ckennelly@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Cc: Shuah Khan <shuah@kernel.org>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: Alexey Dobriyan <adobriyan@gmail.com>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Fangrui Song <maskray@google.com>
      Cc: Hugh Dickens <hughd@google.com>
      Cc: Ian Rogers <irogers@google.com>
      Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
      Cc: Mike Kravetz <mike.kravetz@oracle.com>
      Cc: Nick Desaulniers <ndesaulniers@google.com>
      Cc: Sandeep Patil <sspatil@google.com>
      Cc: Song Liu <songliubraving@fb.com>
      Cc: Suren Baghdasaryan <surenb@google.com>
      Link: https://lkml.kernel.org/r/20200820170541.1132271-3-ckennelly@google.com
      Link: https://lkml.kernel.org/r/20200821233848.3904680-3-ckennelly@google.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      206e22f0
    • Chris Kennelly's avatar
      fs/binfmt_elf: use PT_LOAD p_align values for suitable start address · ce81bb25
      Chris Kennelly authored
      Patch series "Selecting Load Addresses According to p_align", v3.
      
      The current ELF loading mechancism provides page-aligned mappings.  This
      can lead to the program being loaded in a way unsuitable for file-backed,
      transparent huge pages when handling PIE executables.
      
      While specifying -z,max-page-size=0x200000 to the linker will generate
      suitably aligned segments for huge pages on x86_64, the executable needs
      to be loaded at a suitably aligned address as well.  This alignment
      requires the binary's cooperation, as distinct segments need to be
      appropriately paddded to be eligible for THP.
      
      For binaries built with increased alignment, this limits the number of
      bits usable for ASLR, but provides some randomization over using fixed
      load addresses/non-PIE binaries.
      
      This patch (of 2):
      
      The current ELF loading mechancism provides page-aligned mappings.  This
      can lead to the program being loaded in a way unsuitable for file-backed,
      transparent huge pages when handling PIE executables.
      
      For binaries built with increased alignment, this limits the number of
      bits usable for ASLR, but provides some randomization over using fixed
      load addresses/non-PIE binaries.
      
      Tested by verifying program with -Wl,-z,max-page-size=0x200000 loading.
      
      [akpm@linux-foundation.org: fix max() warning]
      [ckennelly@google.com: augment comment]
        Link: https://lkml.kernel.org/r/20200821233848.3904680-2-ckennelly@google.comSigned-off-by: default avatarChris Kennelly <ckennelly@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: Alexey Dobriyan <adobriyan@gmail.com>
      Cc: Song Liu <songliubraving@fb.com>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Ian Rogers <irogers@google.com>
      Cc: Hugh Dickens <hughd@google.com>
      Cc: Suren Baghdasaryan <surenb@google.com>
      Cc: Sandeep Patil <sspatil@google.com>
      Cc: Fangrui Song <maskray@google.com>
      Cc: Nick Desaulniers <ndesaulniers@google.com>
      Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
      Cc: Mike Kravetz <mike.kravetz@oracle.com>
      Cc: Shuah Khan <shuah@kernel.org>
      Link: https://lkml.kernel.org/r/20200820170541.1132271-1-ckennelly@google.com
      Link: https://lkml.kernel.org/r/20200820170541.1132271-2-ckennelly@google.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      ce81bb25
    • Dwaipayan Ray's avatar
      checkpatch: add new warnings to author signoff checks. · 48ca2d8a
      Dwaipayan Ray authored
      The author signed-off-by checks are currently very vague.  Cases like same
      name or same address are not handled separately.
      
      For example, running checkpatch on commit be6577af ("parisc: Add
      atomic64_set_release() define to avoid CPU soft lockups"), gives:
      
      WARNING: Missing Signed-off-by: line by nominal patch author
      'John David Anglin <dave.anglin@bell.net>'
      
      The signoff line was:
      "Signed-off-by: Dave Anglin <dave.anglin@bell.net>"
      
      Clearly the author has signed off but with a slightly different version
      of his name. A more appropriate warning would have been to point out
      at the name mismatch instead.
      
      Previously, the values assumed by $authorsignoff were either 0 or 1
      to indicate whether a proper sign off by author is present.
      Extended the checks to handle four new cases.
      
      $authorsignoff values now denote the following:
      
      0: Missing sign off by patch author.
      
      1: Sign off present and identical.
      
      2: Addresses and names match, but comments differ.
         "James Watson(JW) <james@gmail.com>", "James Watson <james@gmail.com>"
      
      3: Addresses match, but names are different.
         "James Watson <james@gmail.com>", "James <james@gmail.com>"
      
      4: Names match, but addresses are different.
         "James Watson <james@watson.com>", "James Watson <james@gmail.com>"
      
      5: Names match, addresses excluding subaddress details (RFC 5233) match.
         "James Watson <james@gmail.com>", "James Watson <james+a@gmail.com>"
      
      Also introduced a new message type FROM_SIGN_OFF_MISMATCH
      for cases 2, 3, 4 and 5.
      Suggested-by: default avatarJoe Perches <joe@perches.com>
      Signed-off-by: default avatarDwaipayan Ray <dwaipayanray1@gmail.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Acked-by: default avatarJoe Perches <joe@perches.com>
      Link: https://lore.kernel.org/linux-kernel-mentees/c1ca28e77e8e3bfa7aadf3efa8ed70f97a9d369c.camel@perches.com/
      Link: https://lkml.kernel.org/r/20201007192029.551744-1-dwaipayanray1@gmail.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      48ca2d8a
    • Łukasz Stelmach's avatar
      checkpatch: fix false positive on empty block comment lines · c70735c2
      Łukasz Stelmach authored
      To avoid false positives in presence of SPDX-License-Identifier in
      networking files it is required to increase the leeway for empty block
      comment lines by one line.
      
      For example, checking drivers/net/loopback.c which starts with
      
          // SPDX-License-Identifier: GPL-2.0-or-later
          /*
           * INET          An implementation of the TCP/IP protocol suite for the LINUX
      
      rsults in an unnecessary warning
      
          WARNING: networking block comments don't use an empty /* line, use /* Comment...
          +/*
          + * INET                An implementation of the TCP/IP protocol suite for the LINUX
      Signed-off-by: default avatarŁukasz Stelmach <l.stelmach@samsung.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Acked-by: default avatarJoe Perches <joe@perches.com>
      Cc: Bartłomiej Żolnierkiewicz  <b.zolnierkie@samsung.co>
      Cc: Marek Szyprowski <m.szyprowski@samsung.com>
      Link: https://lkml.kernel.org/r/20201006083509.19934-1-l.stelmach@samsung.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      c70735c2