1. 10 Jan, 2019 2 commits
  2. 09 Jan, 2019 17 commits
  3. 08 Jan, 2019 5 commits
    • David Herrmann's avatar
      fork: record start_time late · 7b558513
      David Herrmann authored
      This changes the fork(2) syscall to record the process start_time after
      initializing the basic task structure but still before making the new
      process visible to user-space.
      
      Technically, we could record the start_time anytime during fork(2).  But
      this might lead to scenarios where a start_time is recorded long before
      a process becomes visible to user-space.  For instance, with
      userfaultfd(2) and TLS, user-space can delay the execution of fork(2)
      for an indefinite amount of time (and will, if this causes network
      access, or similar).
      
      By recording the start_time late, it much closer reflects the point in
      time where the process becomes live and can be observed by other
      processes.
      
      Lastly, this makes it much harder for user-space to predict and control
      the start_time they get assigned.  Previously, user-space could fork a
      process and stall it in copy_thread_tls() before its pid is allocated,
      but after its start_time is recorded.  This can be misused to later-on
      cycle through PIDs and resume the stalled fork(2) yielding a process
      that has the same pid and start_time as a process that existed before.
      This can be used to circumvent security systems that identify processes
      by their pid+start_time combination.
      
      Even though user-space was always aware that start_time recording is
      flaky (but several projects are known to still rely on start_time-based
      identification), changing the start_time to be recorded late will help
      mitigate existing attacks and make it much harder for user-space to
      control the start_time a process gets assigned.
      Reported-by: default avatarJann Horn <jannh@google.com>
      Signed-off-by: default avatarTom Gundersen <teg@jklm.no>
      Signed-off-by: default avatarDavid Herrmann <dh.herrmann@gmail.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      7b558513
    • Guo Ren's avatar
      irqchip/csky: fixup handle_irq_perbit break irq · 56752b21
      Guo Ren authored
      The handle_irq_perbit function loop every bit in hwirq local variable.
      
      handle_irq_perbit(hwirq) {
        for_everyt_bit_in(hwirq) {
      	handle_domain_irq()
      		->irq_exit()
      		->invoke_softirq()
      		->__do_softirq()
      		->local_irq_enable() // Here will cause new interrupt.
        }
      }
      
      When new interrupt coming at local_irq_enable, it will finish another
      interrupt handler and pull down the interrupt source. But hwirq is the
      local variable for handle_irq_perbit(), it can't get new interrupt
      controller pending reg status. So we need update hwirq with pending reg
      in every loop.
      
      Also change write_relax to writel could prevent stw from fast retire.
      When local_irq is enabled, intc regs is really set-in.
      Signed-off-by: default avatarGuo Ren <ren_guo@c-sky.com>
      Cc: Lu Baoquan <lu.baoquan@intellif.com>
      56752b21
    • Guo Ren's avatar
      csky: fixup compile error with pte_alloc · 2a60aa14
      Guo Ren authored
      Commit: 4cf58924 remove the address argument of pte_alloc without
      modify csky related code. linux-5.0-rc1 compile failed with csky.
      
      Remove the unnecessary address testing in pte_alloc().
      Signed-off-by: default avatarGuo Ren <ren_guo@c-sky.com>
      Cc: Joel Fernandes (Google) <joel@joelfernandes.org>
      Cc: Guenter Roeck <linux@roeck-us.net>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      2a60aa14
    • Guo Ren's avatar
      csky: fixup CACHEV1 store instruction fast retire · 96354ad7
      Guo Ren authored
      For I/O access, 810/807 store instruction fast retire will cause wrong
      primitive. For example:
      
      	stw (clear interrupt source)
      	stw (unmask interrupt controller)
      	enable interrupt
      
      stw is fast retire instruction. When PC is run at enable interrupt
      stage, the clear interrupt source hasn't finished. It will cause another
      wrong irq-enter.
      
      So use mb() to prevent above.
      Signed-off-by: default avatarGuo Ren <ren_guo@c-sky.com>
      Cc: Lu Baoquan <lu.baoquan@intellif.com>
      96354ad7
    • Guo Ren's avatar
      csky: fixup relocation error with 807 & 860 · f553aa1c
      Guo Ren authored
      810 doesn't support jsri instruction and csky-as will leave
      jsri + nop for relocation. Module-probe need replace them with
      lrw + jsr.
      Signed-off-by: default avatarGuo Ren <ren_guo@c-sky.com>
      Cc: Hui Kai <huikai@acoinfo.com>
      f553aa1c
  4. 07 Jan, 2019 5 commits
    • Guo Ren's avatar
      Documentation/features: Add csky kernel features · 8a5aaf97
      Guo Ren authored
            core/ cBPF-JIT             : TODO |
            core/ eBPF-JIT             : TODO |
            core/ generic-idle-thread  :  ok  |
            core/ jump-labels          : TODO |
            core/ tracehook            :  ok  |
           debug/ KASAN                : TODO |
           debug/ gcov-profile-all     : TODO |
           debug/ kgdb                 : TODO |
           debug/ kprobes-on-ftrace    : TODO |
           debug/ kprobes              : TODO |
           debug/ kretprobes           : TODO |
           debug/ optprobes            : TODO |
           debug/ stackprotector       : TODO |
           debug/ uprobes              : TODO |
           debug/ user-ret-profiler    : TODO |
              io/ dma-contiguous       :  ok  |
         locking/ cmpxchg-local        : TODO |
         locking/ lockdep              : TODO |
         locking/ queued-rwlocks       :  ok  |
         locking/ queued-spinlocks     : TODO |
         locking/ rwsem-optimized      : TODO |
            perf/ kprobes-event        : TODO |
            perf/ perf-regs            : TODO |
            perf/ perf-stackdump       : TODO |
           sched/ membarrier-sync-core : TODO |
           sched/ numa-balancing       :  ..  |
         seccomp/ seccomp-filter       : TODO |
            time/ arch-tick-broadcast  : TODO |
            time/ clockevents          :  ok  |
            time/ context-tracking     : TODO |
            time/ irq-time-acct        : TODO |
            time/ modern-timekeeping   :  ok  |
            time/ virt-cpuacct         : TODO |
              vm/ ELF-ASLR             : TODO |
              vm/ PG_uncached          : TODO |
              vm/ THP                  :  ..  |
              vm/ batch-unmap-tlb-flush: TODO |
              vm/ huge-vmap            : TODO |
              vm/ ioremap_prot         : TODO |
              vm/ numa-memblock        :  ..  |
              vm/ pte_special          : TODO |
      Signed-off-by: default avatarGuo Ren <ren_guo@c-sky.com>
      Cc: Arnd Bergmann <arnd@arndb.de>
      8a5aaf97
    • Masahiro Yamada's avatar
      arch: restore generic-y += shmparam.h for some architectures · 3bd6e94b
      Masahiro Yamada authored
      For some reasons, I accidentally got rid of "generic-y += shmparam.h"
      from some architectures.
      
      Restore them to fix building c6x, h8300, hexagon, m68k, microblaze,
      openrisc, and unicore32.
      
      Fixes: d6e4b3e3 ("arch: remove redundant UAPI generic-y defines")
      Signed-off-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      3bd6e94b
    • Linus Torvalds's avatar
      Linux 5.0-rc1 · bfeffd15
      Linus Torvalds authored
      bfeffd15
    • Linus Torvalds's avatar
      Merge tag 'kbuild-v4.21-3' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild · 85e1ffbd
      Linus Torvalds authored
      Pull more Kbuild updates from Masahiro Yamada:
      
       - improve boolinit.cocci and use_after_iter.cocci semantic patches
      
       - fix alignment for kallsyms
      
       - move 'asm goto' compiler test to Kconfig and clean up jump_label
         CONFIG option
      
       - generate asm-generic wrappers automatically if arch does not
         implement mandatory UAPI headers
      
       - remove redundant generic-y defines
      
       - misc cleanups
      
      * tag 'kbuild-v4.21-3' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
        kconfig: rename generated .*conf-cfg to *conf-cfg
        kbuild: remove unnecessary stubs for archheader and archscripts
        kbuild: use assignment instead of define ... endef for filechk_* rules
        arch: remove redundant UAPI generic-y defines
        kbuild: generate asm-generic wrappers if mandatory headers are missing
        arch: remove stale comments "UAPI Header export list"
        riscv: remove redundant kernel-space generic-y
        kbuild: change filechk to surround the given command with { }
        kbuild: remove redundant target cleaning on failure
        kbuild: clean up rule_dtc_dt_yaml
        kbuild: remove UIMAGE_IN and UIMAGE_OUT
        jump_label: move 'asm goto' support test to Kconfig
        kallsyms: lower alignment on ARM
        scripts: coccinelle: boolinit: drop warnings on named constants
        scripts: coccinelle: check for redeclaration
        kconfig: remove unused "file" field of yylval union
        nds32: remove redundant kernel-space generic-y
        nios2: remove unneeded HAS_DMA define
      85e1ffbd
    • Linus Torvalds's avatar
      Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · ac5eed2b
      Linus Torvalds authored
      Pull perf tooling updates form Ingo Molnar:
       "A final batch of perf tooling changes: mostly fixes and small
        improvements"
      
      * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (29 commits)
        perf session: Add comment for perf_session__register_idle_thread()
        perf thread-stack: Fix thread stack processing for the idle task
        perf thread-stack: Allocate an array of thread stacks
        perf thread-stack: Factor out thread_stack__init()
        perf thread-stack: Allow for a thread stack array
        perf thread-stack: Avoid direct reference to the thread's stack
        perf thread-stack: Tidy thread_stack__bottom() usage
        perf thread-stack: Simplify some code in thread_stack__process()
        tools gpio: Allow overriding CFLAGS
        tools power turbostat: Override CFLAGS assignments and add LDFLAGS to build command
        tools thermal tmon: Allow overriding CFLAGS assignments
        tools power x86_energy_perf_policy: Override CFLAGS assignments and add LDFLAGS to build command
        perf c2c: Increase the HITM ratio limit for displayed cachelines
        perf c2c: Change the default coalesce setup
        perf trace beauty ioctl: Beautify USBDEVFS_ commands
        perf trace beauty: Export function to get the files for a thread
        perf trace: Wire up ioctl's USBDEBFS_ cmd table generator
        perf beauty ioctl: Add generator for USBDEVFS_ ioctl commands
        tools headers uapi: Grab a copy of usbdevice_fs.h
        perf trace: Store the major number for a file when storing its pathname
        ...
      ac5eed2b
  5. 06 Jan, 2019 11 commits
    • Linus Torvalds's avatar
      Change mincore() to count "mapped" pages rather than "cached" pages · 574823bf
      Linus Torvalds authored
      The semantics of what "in core" means for the mincore() system call are
      somewhat unclear, but Linux has always (since 2.3.52, which is when
      mincore() was initially done) treated it as "page is available in page
      cache" rather than "page is mapped in the mapping".
      
      The problem with that traditional semantic is that it exposes a lot of
      system cache state that it really probably shouldn't, and that users
      shouldn't really even care about.
      
      So let's try to avoid that information leak by simply changing the
      semantics to be that mincore() counts actual mapped pages, not pages
      that might be cheaply mapped if they were faulted (note the "might be"
      part of the old semantics: being in the cache doesn't actually guarantee
      that you can access them without IO anyway, since things like network
      filesystems may have to revalidate the cache before use).
      
      In many ways the old semantics were somewhat insane even aside from the
      information leak issue.  From the very beginning (and that beginning is
      a long time ago: 2.3.52 was released in March 2000, I think), the code
      had a comment saying
      
        Later we can get more picky about what "in core" means precisely.
      
      and this is that "later".  Admittedly it is much later than is really
      comfortable.
      
      NOTE! This is a real semantic change, and it is for example known to
      change the output of "fincore", since that program literally does a
      mmmap without populating it, and then doing "mincore()" on that mapping
      that doesn't actually have any pages in it.
      
      I'm hoping that nobody actually has any workflow that cares, and the
      info leak is real.
      
      We may have to do something different if it turns out that people have
      valid reasons to want the old semantics, and if we can limit the
      information leak sanely.
      
      Cc: Kevin Easton <kevin@guarana.org>
      Cc: Jiri Kosina <jikos@kernel.org>
      Cc: Masatake YAMATO <yamato@redhat.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Greg KH <gregkh@linuxfoundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Michal Hocko <mhocko@suse.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      574823bf
    • Linus Torvalds's avatar
      Fix 'acccess_ok()' on alpha and SH · 94bd8a05
      Linus Torvalds authored
      Commit 594cc251 ("make 'user_access_begin()' do 'access_ok()'")
      broke both alpha and SH booting in qemu, as noticed by Guenter Roeck.
      
      It turns out that the bug wasn't actually in that commit itself (which
      would have been surprising: it was mostly a no-op), but in how the
      addition of access_ok() to the strncpy_from_user() and strnlen_user()
      functions now triggered the case where those functions would test the
      access of the very last byte of the user address space.
      
      The string functions actually did that user range test before too, but
      they did it manually by just comparing against user_addr_max().  But
      with user_access_begin() doing the check (using "access_ok()"), it now
      exposed problems in the architecture implementations of that function.
      
      For example, on alpha, the access_ok() helper macro looked like this:
      
        #define __access_ok(addr, size) \
              ((get_fs().seg & (addr | size | (addr+size))) == 0)
      
      and what it basically tests is of any of the high bits get set (the
      USER_DS masking value is 0xfffffc0000000000).
      
      And that's completely wrong for the "addr+size" check.  Because it's
      off-by-one for the case where we check to the very end of the user
      address space, which is exactly what the strn*_user() functions do.
      
      Why? Because "addr+size" will be exactly the size of the address space,
      so trying to access the last byte of the user address space will fail
      the __access_ok() check, even though it shouldn't.  As a result, the
      user string accessor functions failed consistently - because they
      literally don't know how long the string is going to be, and the max
      access is going to be that last byte of the user address space.
      
      Side note: that alpha macro is buggy for another reason too - it re-uses
      the arguments twice.
      
      And SH has another version of almost the exact same bug:
      
        #define __addr_ok(addr) \
              ((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)
      
      so far so good: yes, a user address must be below the limit.  But then:
      
        #define __access_ok(addr, size)         \
              (__addr_ok((addr) + (size)))
      
      is wrong with the exact same off-by-one case: the case when "addr+size"
      is exactly _equal_ to the limit is actually perfectly fine (think "one
      byte access at the last address of the user address space")
      
      The SH version is actually seriously buggy in another way: it doesn't
      actually check for overflow, even though it did copy the _comment_ that
      talks about overflow.
      
      So it turns out that both SH and alpha actually have completely buggy
      implementations of access_ok(), but they happened to work in practice
      (although the SH overflow one is a serious serious security bug, not
      that anybody likely cares about SH security).
      
      This fixes the problems by using a similar macro on both alpha and SH.
      It isn't trying to be clever, the end address is based on this logic:
      
              unsigned long __ao_end = __ao_a + __ao_b - !!__ao_b;
      
      which basically says "add start and length, and then subtract one unless
      the length was zero".  We can't subtract one for a zero length, or we'd
      just hit an underflow instead.
      
      For a lot of access_ok() users the length is a constant, so this isn't
      actually as expensive as it initially looks.
      Reported-and-tested-by: default avatarGuenter Roeck <linux@roeck-us.net>
      Cc: Matt Turner <mattst88@gmail.com>
      Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      94bd8a05
    • Linus Torvalds's avatar
      Merge tag 'fscrypt_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/fscrypt · baa67073
      Linus Torvalds authored
      Pull fscrypt updates from Ted Ts'o:
       "Add Adiantum support for fscrypt"
      
      * tag 'fscrypt_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/fscrypt:
        fscrypt: add Adiantum support
      baa67073
    • Linus Torvalds's avatar
      Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 · 21524046
      Linus Torvalds authored
      Pull ext4 bug fixes from Ted Ts'o:
       "Fix a number of ext4 bugs"
      
      * tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
        ext4: fix special inode number checks in __ext4_iget()
        ext4: track writeback errors using the generic tracking infrastructure
        ext4: use ext4_write_inode() when fsyncing w/o a journal
        ext4: avoid kernel warning when writing the superblock to a dead device
        ext4: fix a potential fiemap/page fault deadlock w/ inline_data
        ext4: make sure enough credits are reserved for dioread_nolock writes
      21524046
    • Linus Torvalds's avatar
      Merge tag 'dma-mapping-4.21-1' of git://git.infradead.org/users/hch/dma-mapping · e2b745f4
      Linus Torvalds authored
      Pull dma-mapping fixes from Christoph Hellwig:
       "Fix various regressions introduced in this cycles:
      
         - fix dma-debug tracking for the map_page / map_single
           consolidatation
      
         - properly stub out DMA mapping symbols for !HAS_DMA builds to avoid
           link failures
      
         - fix AMD Gart direct mappings
      
         - setup the dma address for no kernel mappings using the remap
           allocator"
      
      * tag 'dma-mapping-4.21-1' of git://git.infradead.org/users/hch/dma-mapping:
        dma-direct: fix DMA_ATTR_NO_KERNEL_MAPPING for remapped allocations
        x86/amd_gart: fix unmapping of non-GART mappings
        dma-mapping: remove a few unused exports
        dma-mapping: properly stub out the DMA API for !CONFIG_HAS_DMA
        dma-mapping: remove dmam_{declare,release}_coherent_memory
        dma-mapping: implement dmam_alloc_coherent using dmam_alloc_attrs
        dma-mapping: implement dma_map_single_attrs using dma_map_page_attrs
      e2b745f4
    • Linus Torvalds's avatar
      Merge tag 'tag-chrome-platform-for-v4.21' of... · 12133258
      Linus Torvalds authored
      Merge tag 'tag-chrome-platform-for-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/bleung/chrome-platform
      
      Pull chrome platform updates from Benson Leung:
      
       - Changes for EC_MKBP_EVENT_SENSOR_FIFO handling.
      
       - Also, maintainership changes. Olofj out, Enric balletbo in.
      
      * tag 'tag-chrome-platform-for-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/bleung/chrome-platform:
        MAINTAINERS: add maintainers for ChromeOS EC sub-drivers
        MAINTAINERS: platform/chrome: Add Enric as a maintainer
        MAINTAINERS: platform/chrome: remove myself as maintainer
        platform/chrome: don't report EC_MKBP_EVENT_SENSOR_FIFO as wakeup
        platform/chrome: straighten out cros_ec_get_{next,host}_event() error codes
      12133258
    • Linus Torvalds's avatar
      Merge tag 'hwlock-v4.21' of git://github.com/andersson/remoteproc · 66e012f6
      Linus Torvalds authored
      Pull hwspinlock updates from Bjorn Andersson:
       "This adds support for the hardware semaphores found in STM32MP1"
      
      * tag 'hwlock-v4.21' of git://github.com/andersson/remoteproc:
        hwspinlock: fix return value check in stm32_hwspinlock_probe()
        hwspinlock: add STM32 hwspinlock device
        dt-bindings: hwlock: Document STM32 hwspinlock bindings
      66e012f6
    • Eric Biggers's avatar
      fscrypt: add Adiantum support · 8094c3ce
      Eric Biggers authored
      Add support for the Adiantum encryption mode to fscrypt.  Adiantum is a
      tweakable, length-preserving encryption mode with security provably
      reducible to that of XChaCha12 and AES-256, subject to a security bound.
      It's also a true wide-block mode, unlike XTS.  See the paper
      "Adiantum: length-preserving encryption for entry-level processors"
      (https://eprint.iacr.org/2018/720.pdf) for more details.  Also see
      commit 059c2a4d ("crypto: adiantum - add Adiantum support").
      
      On sufficiently long messages, Adiantum's bottlenecks are XChaCha12 and
      the NH hash function.  These algorithms are fast even on processors
      without dedicated crypto instructions.  Adiantum makes it feasible to
      enable storage encryption on low-end mobile devices that lack AES
      instructions; currently such devices are unencrypted.  On ARM Cortex-A7,
      on 4096-byte messages Adiantum encryption is about 4 times faster than
      AES-256-XTS encryption; decryption is about 5 times faster.
      
      In fscrypt, Adiantum is suitable for encrypting both file contents and
      names.  With filenames, it fixes a known weakness: when two filenames in
      a directory share a common prefix of >= 16 bytes, with CTS-CBC their
      encrypted filenames share a common prefix too, leaking information.
      Adiantum does not have this problem.
      
      Since Adiantum also accepts long tweaks (IVs), it's also safe to use the
      master key directly for Adiantum encryption rather than deriving
      per-file keys, provided that the per-file nonce is included in the IVs
      and the master key isn't used for any other encryption mode.  This
      configuration saves memory and improves performance.  A new fscrypt
      policy flag is added to allow users to opt-in to this configuration.
      Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      8094c3ce
    • Linus Torvalds's avatar
      Merge tag 'docs-5.0-fixes' of git://git.lwn.net/linux · b5aef86e
      Linus Torvalds authored
      Pull documentation fixes from Jonathan Corbet:
       "A handful of late-arriving documentation fixes"
      
      * tag 'docs-5.0-fixes' of git://git.lwn.net/linux:
        doc: filesystems: fix bad references to nonexistent ext4.rst file
        Documentation/admin-guide: update URL of LKML information link
        Docs/kernel-api.rst: Remove blk-tag.c reference
      b5aef86e
    • Linus Torvalds's avatar
      Merge tag 'firewire-update' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394 · 15b215e5
      Linus Torvalds authored
      Pull firewire fixlet from Stefan Richter:
       "Remove an explicit dependency in Kconfig which is implied by another
        dependency"
      
      * tag 'firewire-update' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394:
        firewire: Remove depends on HAS_DMA in case of platform dependency
      15b215e5
    • Linus Torvalds's avatar
      Merge tag 'for-linus-20190104' of git://git.kernel.dk/linux-block · d7252d0d
      Linus Torvalds authored
      Pull block updates and fixes from Jens Axboe:
      
       - Pulled in MD changes that Shaohua had queued up for 4.21.
      
         Unfortunately we lost Shaohua late 2018, I'm sending these in on his
         behalf.
      
       - In conjunction with the above, I added a CREDITS entry for Shaoua.
      
       - sunvdc queue restart fix (Ming)
      
      * tag 'for-linus-20190104' of git://git.kernel.dk/linux-block:
        Add CREDITS entry for Shaohua Li
        block: sunvdc: don't run hw queue synchronously from irq context
        md: fix raid10 hang issue caused by barrier
        raid10: refactor common wait code from regular read/write request
        md: remvoe redundant condition check
        lib/raid6: add option to skip algo benchmarking
        lib/raid6: sort algos in rough performance order
        lib/raid6: check for assembler SSSE3 support
        lib/raid6: avoid __attribute_const__ redefinition
        lib/raid6: add missing include for raid6test
        md: remove set but not used variable 'bi_rdev'
      d7252d0d