1. 06 Jan, 2021 9 commits
  2. 04 Jan, 2021 1 commit
    • Al Viro's avatar
      binfmt_elf: partially sanitize PRSTATUS_SIZE and SET_PR_FPVALID · 8a00dd00
      Al Viro authored
      On 64bit architectures that support 32bit processes there are
      two possible layouts for NT_PRSTATUS note in ELF coredumps.
      For one thing, several fields are 64bit for native processes
      and 32bit for compat ones (pr_sigpend, etc.).  For another,
      the register dump is obviously different - the size and number
      of registers are not going to be the same for 32bit and 64bit
      variants of processor.
      
      Usually that's handled by having two structures - elf_prstatus
      for native layout and compat_elf_prstatus for 32bit one.
      32bit processes are handled by fs/compat_binfmt_elf.c, which
      defines a macro called 'elf_prstatus' that expands to compat_elf_prstatus.
      Then it includes fs/binfmt_elf.c, which makes all references to
      struct elf_prstatus to be textually replaced with struct
      compat_elf_prstatus.  Ugly and somewhat brittle, but it works.
      
      However, amd64 is worse - there are _three_ possible layouts.
      One for native 64bit processes, another for i386 (32bit) processes
      and yet another for x32 (32bit address space with full 64bit
      registers).
      
      Both i386 and x32 processes are handled by fs/compat_binfmt_elf.c,
      with usual compat_binfmt_elf.c trickery.  However, the layouts
      for i386 and x32 are not identical - they have the common beginning,
      but the register dump part (pr_reg) is bigger on x32.  Worse, pr_reg
      is not the last field - it's followed by int pr_fpvalid, so that
      field ends up at different offsets for i386 and x32 layouts.
      
      Fortunately, there's not much code that cares about any of that -
      it's all encapsulated in fill_thread_core_info().  Since x32
      variant is bigger, we define compat_elf_prstatus to match that
      layout.  That way i386 processes have enough space to fit
      their layout into.
      
      Moreover, since these layouts are identical prior to pr_reg,
      we don't need to distinguish x32 and i386 cases when we are
      setting the fields prior to pr_reg.
      
      Filling pr_reg itself is done by calling ->get() method of
      appropriate regset, and that method knows what layout (and size)
      to use.
      
      We do need to distinguish x32 and i386 cases only for two
      things: setting ->pr_fpvalid (offset differs for x32 and
      i386) and choosing the right size for our note.
      
      The way it's done is Not Nice, for the lack of more accurate
      printable description.  There are two macros (PRSTATUS_SIZE and
      SET_PR_FPVALID), that default essentially to sizeof(struct elf_prstatus)
      and (S)->pr_fpvalid = 1.  On x86 asm/compat.h provides its own
      variants.
      
      Unfortunately, quite a few things go wrong there:
      	* PRSTATUS_SIZE doesn't use the normal test for process
      being an x32 one; it compares the size reported by regset with
      the size of pr_reg.
      	* it hardcodes the sizes of x32 and i386 variants (296 and 144
      resp.), so if some change in includes leads to asm/compat.h pulled
      in by fs/binfmt_elf.c we are in trouble - it will end up using
      the size of x32 variant for 64bit processes.
      	* it's in the wrong place; asm/compat.h couldn't define
      the structure for i386 layout, since it lacks quite a few types
      needed for it.  Hardcoded sizes are largely due to that.
      
      The proper fix would be to have an explicitly defined i386 variant
      of structure and have PRSTATUS_SIZE/SET_PR_FPVALID check for
      TIF_X32 to choose the variant that should be used.  Unfortunately,
      that requires some manipulations of headers; we'll do that later
      in the series, but for now let's go with the minimal variant -
      rename PRSTATUS_SIZE in asm/compat.h to COMPAT_PRSTATUS_SIZE,
      have fs/compat_binfmt_elf.c define PRSTATUS_SIZE to COMPAT_PRSTATUS_SIZE
      and use the normal TIF_X32 check in that macro.  The size of i386 variant
      is kept hardcoded for now.  Similar story for SET_PR_FPVALID.
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      8a00dd00
  3. 28 Dec, 2020 2 commits
  4. 27 Dec, 2020 8 commits
  5. 26 Dec, 2020 5 commits
  6. 25 Dec, 2020 5 commits
    • Linus Torvalds's avatar
      drm/amd/display: avoid uninitialized variable warning · 61d79136
      Linus Torvalds authored
      clang (quite rightly) complains fairly loudly about the newly added
      mpc1_get_mpc_out_mux() function returning an uninitialized value if the
      'opp_id' checks don't pass.
      
      This may not happen in practice, but the code really shouldn't return
      garbage if the sanity checks don't pass.
      
      So just initialize 'val' to zero to avoid the issue.
      
      Fixes: 110b055b ("drm/amd/display: add getter routine to retrieve mpcc mux")
      Cc: Josip Pavic <Josip.Pavic@amd.com>
      Cc: Bindu Ramamurthy <bindu.r@amd.com>
      Cc: Alex Deucher <alexander.deucher@amd.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      61d79136
    • Linus Torvalds's avatar
      Merge tag 'perf-tools-2020-12-24' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux · 5814bc2d
      Linus Torvalds authored
      Pull more perf tools updates from Arnaldo Carvalho de Melo:
      
       - Refactor 'perf stat' per CPU/socket/die/thread aggregation fixing use
         cases in ARM machines.
      
       - Fix memory leak when synthesizing SDT probes in 'perf probe'.
      
       - Update kernel header copies related to KVM, epol_pwait. msr-index and
         powerpc and s390 syscall tables.
      
      * tag 'perf-tools-2020-12-24' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux: (24 commits)
        perf probe: Fix memory leak when synthesizing SDT probes
        perf stat aggregation: Add separate thread member
        perf stat aggregation: Add separate core member
        perf stat aggregation: Add separate die member
        perf stat aggregation: Add separate socket member
        perf stat aggregation: Add separate node member
        perf stat aggregation: Start using cpu_aggr_id in map
        perf cpumap: Drop in cpu_aggr_map struct
        perf cpumap: Add new map type for aggregation
        perf stat: Replace aggregation ID with a struct
        perf cpumap: Add new struct for cpu aggregation
        perf cpumap: Use existing allocator to avoid using malloc
        perf tests: Improve topology test to check all aggregation types
        perf tools: Update s390's syscall.tbl copy from the kernel sources
        perf tools: Update powerpc's syscall.tbl copy from the kernel sources
        perf s390: Move syscall.tbl check into check-headers.sh
        perf powerpc: Move syscall.tbl check to check-headers.sh
        tools headers UAPI: Synch KVM's svm.h header with the kernel
        tools kvm headers: Update KVM headers from the kernel sources
        tools headers UAPI: Sync KVM's vmx.h header with the kernel sources
        ...
      5814bc2d
    • Linus Torvalds's avatar
      Merge branch 'for-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/jlawall/linux · 42dc45e8
      Linus Torvalds authored
      Pull coccinelle updates from Julia Lawall.
      
      * 'for-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/jlawall/linux:
        scripts: coccicheck: Correct usage of make coccicheck
        coccinelle: update expiring email addresses
        coccinnelle: Remove ptr_ret script
        kbuild: do not use scripts/ld-version.sh for checking spatch version
        remove boolinit.cocci
      42dc45e8
    • Michael Ellerman's avatar
      genirq: Fix export of irq_to_desc() for powerpc KVM · 11cc92eb
      Michael Ellerman authored
      Commit 64a1b95b ("genirq: Restrict export of irq_to_desc()") removed
      the export of irq_to_desc() unless powerpc KVM is being built, because
      there is still a use of irq_to_desc() in modular code there.
      
      However it used:
      
        #ifdef CONFIG_KVM_BOOK3S_64_HV
      
      Which doesn't work when that symbol is =m, leading to a build failure:
      
        ERROR: modpost: "irq_to_desc" [arch/powerpc/kvm/kvm-hv.ko] undefined!
      
      Fix it by checking for the definedness of the correct symbol which is
      CONFIG_KVM_BOOK3S_64_HV_MODULE.
      
      Fixes: 64a1b95b ("genirq: Restrict export of irq_to_desc()")
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      11cc92eb
    • Linus Torvalds's avatar
      Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs · 7bb5226c
      Linus Torvalds authored
      Pull misc vfs updates from Al Viro:
       "Assorted patches from previous cycle(s)..."
      
      * 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
        fix hostfs_open() use of ->f_path.dentry
        Make sure that make_create_in_sticky() never sees uninitialized value of dir_mode
        fs: Kill DCACHE_DONTCACHE dentry even if DCACHE_REFERENCED is set
        fs: Handle I_DONTCACHE in iput_final() instead of generic_drop_inode()
        fs/namespace.c: WARN if mnt_count has become negative
      7bb5226c
  7. 24 Dec, 2020 10 commits
    • Linus Torvalds's avatar
      Merge tag 'docs-5.11-2' of git://git.lwn.net/linux · 71c5f031
      Linus Torvalds authored
      Pull documentation fixes from Jonathan Corbet:
       "A small set of late-arriving, small documentation fixes"
      
      * tag 'docs-5.11-2' of git://git.lwn.net/linux:
        docs: admin-guide: Fix default value of max_map_count in sysctl/vm.rst
        Documentation/submitting-patches: Document the SoB chain
        Documentation: process: Correct numbering
        docs: submitting-patches: Trivial - fix grammatical error
      71c5f031
    • Linus Torvalds's avatar
      Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 · 555a6e8c
      Linus Torvalds authored
      Pull ext4 updates from Ted Ts'o:
       "Various bug fixes and cleanups for ext4; no new features this cycle"
      
      * tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (29 commits)
        ext4: remove unnecessary wbc parameter from ext4_bio_write_page
        ext4: avoid s_mb_prefetch to be zero in individual scenarios
        ext4: defer saving error info from atomic context
        ext4: simplify ext4 error translation
        ext4: move functions in super.c
        ext4: make ext4_abort() use __ext4_error()
        ext4: standardize error message in ext4_protect_reserved_inode()
        ext4: remove redundant sb checksum recomputation
        ext4: don't remount read-only with errors=continue on reboot
        ext4: fix deadlock with fs freezing and EA inodes
        jbd2: add a helper to find out number of fast commit blocks
        ext4: make fast_commit.h byte identical with e2fsprogs/fast_commit.h
        ext4: fix fall-through warnings for Clang
        ext4: add docs about fast commit idempotence
        ext4: remove the unused EXT4_CURRENT_REV macro
        ext4: fix an IS_ERR() vs NULL check
        ext4: check for invalid block size early when mounting a file system
        ext4: fix a memory leak of ext4_free_data
        ext4: delete nonsensical (commented-out) code inside ext4_xattr_block_set()
        ext4: update ext4_data_block_valid related comments
        ...
      555a6e8c
    • Linus Torvalds's avatar
      Merge tag 'Smack-for-5.11-io_uring-fix' of git://github.com/cschaufler/smack-next · 2f2fce3d
      Linus Torvalds authored
      Pull smack fix from Casey Schaufler:
       "Provide a fix for the incorrect handling of privilege in the face of
        io_uring's use of kernel threads. That invalidated an long standing
        assumption regarding the privilege of kernel threads.
      
        The fix is simple and safe. It was provided by Jens Axboe and has been
        tested"
      
      * tag 'Smack-for-5.11-io_uring-fix' of git://github.com/cschaufler/smack-next:
        Smack: Handle io_uring kernel thread privileges
      2f2fce3d
    • Linus Torvalds's avatar
      Merge tag 'riscv-for-linus-5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux · 7a2fde8d
      Linus Torvalds authored
      Pull RISC-V fix from Palmer Dabbelt
       "Avoid trying to initialize memory regions outside the usable range"
      
      * tag 'riscv-for-linus-5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
        RISC-V: Fix usage of memblock_enforce_memory_limit
      7a2fde8d
    • Linus Torvalds's avatar
      Merge tag 'powerpc-5.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux · 9b3f7f1b
      Linus Torvalds authored
      Pull powerpc fixes from Michael Ellerman:
      
       - Four commits fixing various things in the new C VDSO code
      
       - One fix for a 32-bit VMAP stack bug
      
       - Two minor build fixes
      
      Thanks to Cédric Le Goater, Christophe Leroy, and Will Springer.
      
      * tag 'powerpc-5.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
        powerpc/32: Fix vmap stack - Properly set r1 before activating MMU on syscall too
        powerpc/vdso: Fix DOTSYM for 32-bit LE VDSO
        powerpc/vdso: Don't pass 64-bit ABI cflags to 32-bit VDSO
        powerpc/vdso: Block R_PPC_REL24 relocations
        powerpc/smp: Add __init to init_big_cores()
        powerpc/time: Force inlining of get_tb()
        powerpc/boot: Fix build of dts/fsl
      9b3f7f1b
    • Linus Torvalds's avatar
      Merge tag 'irq-core-2020-12-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 3913d00a
      Linus Torvalds authored
      Pull irq updates from Thomas Gleixner:
       "This is the second attempt after the first one failed miserably and
        got zapped to unblock the rest of the interrupt related patches.
      
        A treewide cleanup of interrupt descriptor (ab)use with all sorts of
        racy accesses, inefficient and disfunctional code. The goal is to
        remove the export of irq_to_desc() to prevent these things from
        creeping up again"
      
      * tag 'irq-core-2020-12-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (30 commits)
        genirq: Restrict export of irq_to_desc()
        xen/events: Implement irq distribution
        xen/events: Reduce irq_info:: Spurious_cnt storage size
        xen/events: Only force affinity mask for percpu interrupts
        xen/events: Use immediate affinity setting
        xen/events: Remove disfunct affinity spreading
        xen/events: Remove unused bind_evtchn_to_irq_lateeoi()
        net/mlx5: Use effective interrupt affinity
        net/mlx5: Replace irq_to_desc() abuse
        net/mlx4: Use effective interrupt affinity
        net/mlx4: Replace irq_to_desc() abuse
        PCI: mobiveil: Use irq_data_get_irq_chip_data()
        PCI: xilinx-nwl: Use irq_data_get_irq_chip_data()
        NTB/msi: Use irq_has_action()
        mfd: ab8500-debugfs: Remove the racy fiddling with irq_desc
        pinctrl: nomadik: Use irq_has_action()
        drm/i915/pmu: Replace open coded kstat_irqs() copy
        drm/i915/lpe_audio: Remove pointless irq_to_desc() usage
        s390/irq: Use irq_desc_kstat_cpu() in show_msi_interrupt()
        parisc/irq: Use irq_desc_kstat_cpu() in show_interrupts()
        ...
      3913d00a
    • Linus Torvalds's avatar
      Merge tag 'efi_updates_for_v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 4a1106af
      Linus Torvalds authored
      Pull EFI updates from Borislav Petkov:
       "These got delayed due to a last minute ia64 build issue which got
        fixed in the meantime.
      
        EFI updates collected by Ard Biesheuvel:
      
         - Don't move BSS section around pointlessly in the x86 decompressor
      
         - Refactor helper for discovering the EFI secure boot mode
      
         - Wire up EFI secure boot to IMA for arm64
      
         - Some fixes for the capsule loader
      
         - Expose the RT_PROP table via the EFI test module
      
         - Relax DT and kernel placement restrictions on ARM
      
        with a few followup fixes:
      
         - fix the build breakage on IA64 caused by recent capsule loader
           changes
      
         - suppress a type mismatch build warning in the expansion of
           EFI_PHYS_ALIGN on ARM"
      
      * tag 'efi_updates_for_v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        efi: arm: force use of unsigned type for EFI_PHYS_ALIGN
        efi: ia64: disable the capsule loader
        efi: stub: get rid of efi_get_max_fdt_addr()
        efi/efi_test: read RuntimeServicesSupported
        efi: arm: reduce minimum alignment of uncompressed kernel
        efi: capsule: clean scatter-gather entries from the D-cache
        efi: capsule: use atomic kmap for transient sglist mappings
        efi: x86/xen: switch to efi_get_secureboot_mode helper
        arm64/ima: add ima_arch support
        ima: generalize x86/EFI arch glue for other EFI architectures
        efi: generalize efi_get_secureboot
        efi/libstub: EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER should not default to yes
        efi/x86: Only copy the compressed kernel image in efi_relocate_kernel()
        efi/libstub/x86: simplify efi_is_native()
      4a1106af
    • Linus Torvalds's avatar
      Merge tag 'io_uring-5.11-2020-12-23' of git://git.kernel.dk/linux-block · 60e8edd2
      Linus Torvalds authored
      Pull io_uring fixes from Jens Axboe:
       "All straight fixes, or a prep patch for a fix, either bound for stable
        or fixing issues from this merge window. In particular:
      
         - Fix new shutdown op not breaking links on failure
      
         - Hold mm->mmap_sem for mm->locked_vm manipulation
      
         - Various cancelation fixes (me, Pavel)
      
         - Fix error path potential double ctx free (Pavel)
      
         - IOPOLL fixes (Xiaoguang)"
      
      * tag 'io_uring-5.11-2020-12-23' of git://git.kernel.dk/linux-block:
        io_uring: hold uring_lock while completing failed polled io in io_wq_submit_work()
        io_uring: fix double io_uring free
        io_uring: fix ignoring xa_store errors
        io_uring: end waiting before task cancel attempts
        io_uring: always progress task_work on task cancel
        io-wq: kill now unused io_wq_cancel_all()
        io_uring: make ctx cancel on exit targeted to actual ctx
        io_uring: fix 0-iov read buffer select
        io_uring: close a small race gap for files cancel
        io_uring: fix io_wqe->work_list corruption
        io_uring: limit {io|sq}poll submit locking scope
        io_uring: inline io_cqring_mark_overflow()
        io_uring: consolidate CQ nr events calculation
        io_uring: remove racy overflow list fast checks
        io_uring: cancel reqs shouldn't kill overflow list
        io_uring: hold mmap_sem for mm->locked_vm manipulation
        io_uring: break links on shutdown failure
      60e8edd2
    • Linus Torvalds's avatar
      Merge tag 'block-5.11-2020-12-23' of git://git.kernel.dk/linux-block · 771e7e41
      Linus Torvalds authored
      Pull block fixes from Jens Axboe:
       "A few stragglers in here, but mostly just straight fixes. In
        particular:
      
         - Set of rnbd fixes for issues around changes for the merge window
           (Gioh, Jack, Md Haris Iqbal)
      
         - iocost tracepoint addition (Baolin)
      
         - Copyright/maintainers update (Christoph)
      
         - Remove old blk-mq fast path CPU warning (Daniel)
      
         - loop max_part fix (Josh)
      
         - Remote IPI threaded IRQ fix (Sebastian)
      
         - dasd stable fixes (Stefan)
      
         - bcache merge window fixup and style fixup (Yi, Zheng)"
      
      * tag 'block-5.11-2020-12-23' of git://git.kernel.dk/linux-block:
        md/bcache: convert comma to semicolon
        bcache:remove a superfluous check in register_bcache
        block: update some copyrights
        block: remove a pointless self-reference in block_dev.c
        MAINTAINERS: add fs/block_dev.c to the block section
        blk-mq: Don't complete on a remote CPU in force threaded mode
        s390/dasd: fix list corruption of lcu list
        s390/dasd: fix list corruption of pavgroup group list
        s390/dasd: prevent inconsistent LCU device data
        s390/dasd: fix hanging device offline processing
        blk-iocost: Add iocg idle state tracepoint
        nbd: Respect max_part for all partition scans
        block/rnbd-clt: Does not request pdu to rtrs-clt
        block/rnbd-clt: Dynamically allocate sglist for rnbd_iu
        block/rnbd: Set write-back cache and fua same to the target device
        block/rnbd: Fix typos
        block/rnbd-srv: Protect dev session sysfs removal
        block/rnbd-clt: Fix possible memleak
        block/rnbd-clt: Get rid of warning regarding size argument in strlcpy
        blk-mq: Remove 'running from the wrong CPU' warning
      771e7e41
    • Linus Torvalds's avatar
      Merge tag 'libnvdimm-for-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm · 1f13d2f7
      Linus Torvalds authored
      Pull libnvdimm updates from Dan Williams:
       "Twas the day before Christmas and the only thing stirring in libnvdimm
        / device-dax land is a pile of miscellaneous fixups and cleanups.
      
        The bulk of it has appeared in -next save the last two patches to
        device-dax that have passed my build and unit tests.
      
         - Fix a long standing block-window-namespace issue surfaced by the
           ndctl change to attempt to preserve the kernel device name over
           a 'reconfigure'
      
         - Fix a few error path memory leaks in nfit and device-dax
      
         - Silence a smatch warning in the ioctl path
      
         - Miscellaneous cleanups"
      
      * tag 'libnvdimm-for-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
        device-dax: Avoid an unnecessary check in alloc_dev_dax_range()
        device-dax: Fix range release
        device-dax: delete a redundancy check in dev_dax_validate_align()
        libnvdimm/label: Return -ENXIO for no slot in __blk_label_update
        device-dax/core: Fix memory leak when rmmod dax.ko
        device-dax/pmem: Convert comma to semicolon
        libnvdimm: Cleanup include of badblocks.h
        ACPI: NFIT: Fix input validation of bus-family
        libnvdimm/namespace: Fix reaping of invalidated block-window-namespace labels
        ACPI/nfit: avoid accessing uninitialized memory in acpi_nfit_ctl()
      1f13d2f7