Commit Graph

2197 Commits

Author SHA1 Message Date
Linus Torvalds 9abf2313ad Linux 6.1-rc1 2022-10-16 15:36:24 -07:00
Linus Torvalds 2df76606db Kbuild fixes for v6.1
- Fix CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y compile error for
    the combination of Clang >= 14 and GAS <= 2.35.
 
  - Drop vmlinux.bz2 from the rpm package as it just annoyingly increased
    the package size.
 
  - Fix modpost error under build environments using musl.
 
  - Make *.ll files keep value names for easier debugging
 
  - Fix single directory build
 
  - Prevent RISC-V from selecting the broken DWARF5 support when Clang
    and GAS are used together.
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Merge tag 'kbuild-fixes-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild fixes from Masahiro Yamada:

 - Fix CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y compile error for the
   combination of Clang >= 14 and GAS <= 2.35.

 - Drop vmlinux.bz2 from the rpm package as it just annoyingly increased
   the package size.

 - Fix modpost error under build environments using musl.

 - Make *.ll files keep value names for easier debugging

 - Fix single directory build

 - Prevent RISC-V from selecting the broken DWARF5 support when Clang
   and GAS are used together.

* tag 'kbuild-fixes-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  lib/Kconfig.debug: Add check for non-constant .{s,u}leb128 support to DWARF5
  kbuild: fix single directory build
  kbuild: add -fno-discard-value-names to cmd_cc_ll_c
  scripts/clang-tools: Convert clang-tidy args to list
  modpost: put modpost options before argument
  kbuild: Stop including vmlinux.bz2 in the rpm's
  Kconfig.debug: add toolchain checks for DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
  Kconfig.debug: simplify the dependency of DEBUG_INFO_DWARF4/5
2022-10-16 11:12:22 -07:00
Masahiro Yamada 3753af778d kbuild: fix single directory build
Commit f110e5a250 ("kbuild: refactor single builds of *.ko") was wrong.

KBUILD_MODULES _is_ needed for single builds.

Otherwise, "make foo/bar/baz/" does not build module objects at all.

Fixes: f110e5a250 ("kbuild: refactor single builds of *.ko")
Reported-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: David Sterba <dsterba@suse.com>
2022-10-17 02:03:52 +09:00
Linus Torvalds 27bc50fc90 - Yu Zhao's Multi-Gen LRU patches are here. They've been under test in
linux-next for a couple of months without, to my knowledge, any negative
   reports (or any positive ones, come to that).
 
 - Also the Maple Tree from Liam R.  Howlett.  An overlapping range-based
   tree for vmas.  It it apparently slight more efficient in its own right,
   but is mainly targeted at enabling work to reduce mmap_lock contention.
 
   Liam has identified a number of other tree users in the kernel which
   could be beneficially onverted to mapletrees.
 
   Yu Zhao has identified a hard-to-hit but "easy to fix" lockdep splat
   (https://lkml.kernel.org/r/CAOUHufZabH85CeUN-MEMgL8gJGzJEWUrkiM58JkTbBhh-jew0Q@mail.gmail.com).
   This has yet to be addressed due to Liam's unfortunately timed
   vacation.  He is now back and we'll get this fixed up.
 
 - Dmitry Vyukov introduces KMSAN: the Kernel Memory Sanitizer.  It uses
   clang-generated instrumentation to detect used-unintialized bugs down to
   the single bit level.
 
   KMSAN keeps finding bugs.  New ones, as well as the legacy ones.
 
 - Yang Shi adds a userspace mechanism (madvise) to induce a collapse of
   memory into THPs.
 
 - Zach O'Keefe has expanded Yang Shi's madvise(MADV_COLLAPSE) to support
   file/shmem-backed pages.
 
 - userfaultfd updates from Axel Rasmussen
 
 - zsmalloc cleanups from Alexey Romanov
 
 - cleanups from Miaohe Lin: vmscan, hugetlb_cgroup, hugetlb and memory-failure
 
 - Huang Ying adds enhancements to NUMA balancing memory tiering mode's
   page promotion, with a new way of detecting hot pages.
 
 - memcg updates from Shakeel Butt: charging optimizations and reduced
   memory consumption.
 
 - memcg cleanups from Kairui Song.
 
 - memcg fixes and cleanups from Johannes Weiner.
 
 - Vishal Moola provides more folio conversions
 
 - Zhang Yi removed ll_rw_block() :(
 
 - migration enhancements from Peter Xu
 
 - migration error-path bugfixes from Huang Ying
 
 - Aneesh Kumar added ability for a device driver to alter the memory
   tiering promotion paths.  For optimizations by PMEM drivers, DRM
   drivers, etc.
 
 - vma merging improvements from Jakub Matěn.
 
 - NUMA hinting cleanups from David Hildenbrand.
 
 - xu xin added aditional userspace visibility into KSM merging activity.
 
 - THP & KSM code consolidation from Qi Zheng.
 
 - more folio work from Matthew Wilcox.
 
 - KASAN updates from Andrey Konovalov.
 
 - DAMON cleanups from Kaixu Xia.
 
 - DAMON work from SeongJae Park: fixes, cleanups.
 
 - hugetlb sysfs cleanups from Muchun Song.
 
 - Mike Kravetz fixes locking issues in hugetlbfs and in hugetlb core.
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Merge tag 'mm-stable-2022-10-08' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull MM updates from Andrew Morton:

 - Yu Zhao's Multi-Gen LRU patches are here. They've been under test in
   linux-next for a couple of months without, to my knowledge, any
   negative reports (or any positive ones, come to that).

 - Also the Maple Tree from Liam Howlett. An overlapping range-based
   tree for vmas. It it apparently slightly more efficient in its own
   right, but is mainly targeted at enabling work to reduce mmap_lock
   contention.

   Liam has identified a number of other tree users in the kernel which
   could be beneficially onverted to mapletrees.

   Yu Zhao has identified a hard-to-hit but "easy to fix" lockdep splat
   at [1]. This has yet to be addressed due to Liam's unfortunately
   timed vacation. He is now back and we'll get this fixed up.

 - Dmitry Vyukov introduces KMSAN: the Kernel Memory Sanitizer. It uses
   clang-generated instrumentation to detect used-unintialized bugs down
   to the single bit level.

   KMSAN keeps finding bugs. New ones, as well as the legacy ones.

 - Yang Shi adds a userspace mechanism (madvise) to induce a collapse of
   memory into THPs.

 - Zach O'Keefe has expanded Yang Shi's madvise(MADV_COLLAPSE) to
   support file/shmem-backed pages.

 - userfaultfd updates from Axel Rasmussen

 - zsmalloc cleanups from Alexey Romanov

 - cleanups from Miaohe Lin: vmscan, hugetlb_cgroup, hugetlb and
   memory-failure

 - Huang Ying adds enhancements to NUMA balancing memory tiering mode's
   page promotion, with a new way of detecting hot pages.

 - memcg updates from Shakeel Butt: charging optimizations and reduced
   memory consumption.

 - memcg cleanups from Kairui Song.

 - memcg fixes and cleanups from Johannes Weiner.

 - Vishal Moola provides more folio conversions

 - Zhang Yi removed ll_rw_block() :(

 - migration enhancements from Peter Xu

 - migration error-path bugfixes from Huang Ying

 - Aneesh Kumar added ability for a device driver to alter the memory
   tiering promotion paths. For optimizations by PMEM drivers, DRM
   drivers, etc.

 - vma merging improvements from Jakub Matěn.

 - NUMA hinting cleanups from David Hildenbrand.

 - xu xin added aditional userspace visibility into KSM merging
   activity.

 - THP & KSM code consolidation from Qi Zheng.

 - more folio work from Matthew Wilcox.

 - KASAN updates from Andrey Konovalov.

 - DAMON cleanups from Kaixu Xia.

 - DAMON work from SeongJae Park: fixes, cleanups.

 - hugetlb sysfs cleanups from Muchun Song.

 - Mike Kravetz fixes locking issues in hugetlbfs and in hugetlb core.

Link: https://lkml.kernel.org/r/CAOUHufZabH85CeUN-MEMgL8gJGzJEWUrkiM58JkTbBhh-jew0Q@mail.gmail.com [1]

* tag 'mm-stable-2022-10-08' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (555 commits)
  hugetlb: allocate vma lock for all sharable vmas
  hugetlb: take hugetlb vma_lock when clearing vma_lock->vma pointer
  hugetlb: fix vma lock handling during split vma and range unmapping
  mglru: mm/vmscan.c: fix imprecise comments
  mm/mglru: don't sync disk for each aging cycle
  mm: memcontrol: drop dead CONFIG_MEMCG_SWAP config symbol
  mm: memcontrol: use do_memsw_account() in a few more places
  mm: memcontrol: deprecate swapaccounting=0 mode
  mm: memcontrol: don't allocate cgroup swap arrays when memcg is disabled
  mm/secretmem: remove reduntant return value
  mm/hugetlb: add available_huge_pages() func
  mm: remove unused inline functions from include/linux/mm_inline.h
  selftests/vm: add selftest for MADV_COLLAPSE of uffd-minor memory
  selftests/vm: add file/shmem MADV_COLLAPSE selftest for cleared pmd
  selftests/vm: add thp collapse shmem testing
  selftests/vm: add thp collapse file and tmpfs testing
  selftests/vm: modularize thp collapse memory operations
  selftests/vm: dedup THP helpers
  mm/khugepaged: add tracepoint to hpage_collapse_scan_file()
  mm/madvise: add file and shmem support to MADV_COLLAPSE
  ...
2022-10-10 17:53:04 -07:00
Linus Torvalds 706eacadd5 Devicetree updates for v6.1:
DT core:
 
 - Fix node refcounting in of_find_last_cache_level()
 
 - Constify device_node in of_device_compatible_match()
 
 - Fix 'dma-ranges' handling in bus controller nodes
 
 - Fix handling of initrd start > end
 
 - Improve error reporting in of_irq_init()
 
 - Taint kernel on DT unittest running
 
 - Use strscpy instead of strlcpy
 
 - Add a build target, dt_compatible_check, to check for
   compatible strings used in kernel sources against compatible strings
   in DT schemas.
 
 - Handle DT_SCHEMA_FILES changes when rebuilding
 
 DT bindings:
 
 - LED bindings for MT6370 PMIC
 
 - Convert Mediatek mtk-gce mailbox, MIPS CPU interrupt controller,
   mt7621 I2C, virtio,pci-iommu, nxp,tda998x, QCom fastrpc, qcom,pdc,
   and arm,versatile-sysreg to DT schema format
 
 - Add nvmem cells to u-boot,env schema
 
 - Add more LED_COLOR_ID definitions
 
 - Require 'opp-table' uses to be a node
 
 - Various schema fixes to match QEMU 'virt' DT usage
 
 - Tree wide dropping of redundant 'Device Tree Binding' in schema titles
 
 - More (unevaluated|additional)Properties fixes in schema child nodes
 
 - Drop various redundant minItems equal to maxItems
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Merge tag 'devicetree-for-6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux

Pull devicetree updates from Rob Herring:
 "DT core:

   - Fix node refcounting in of_find_last_cache_level()

   - Constify device_node in of_device_compatible_match()

   - Fix 'dma-ranges' handling in bus controller nodes

   - Fix handling of initrd start > end

   - Improve error reporting in of_irq_init()

   - Taint kernel on DT unittest running

   - Use strscpy instead of strlcpy

   - Add a build target, dt_compatible_check, to check for compatible
     strings used in kernel sources against compatible strings in DT
     schemas.

   - Handle DT_SCHEMA_FILES changes when rebuilding

  DT bindings:

   - LED bindings for MT6370 PMIC

   - Convert Mediatek mtk-gce mailbox, MIPS CPU interrupt controller,
     mt7621 I2C, virtio,pci-iommu, nxp,tda998x, QCom fastrpc, qcom,pdc,
     and arm,versatile-sysreg to DT schema format

   - Add nvmem cells to u-boot,env schema

   - Add more LED_COLOR_ID definitions

   - Require 'opp-table' uses to be a node

   - Various schema fixes to match QEMU 'virt' DT usage

   - Tree wide dropping of redundant 'Device Tree Binding' in schema
     titles

   - More (unevaluated|additional)Properties fixes in schema child nodes

   - Drop various redundant minItems equal to maxItems"

* tag 'devicetree-for-6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: (62 commits)
  of: base: Shift refcount decrement in of_find_last_cache_level()
  dt-bindings: leds: Add MediaTek MT6370 flashlight
  dt-bindings: leds: mt6370: Add MediaTek MT6370 current sink type LED indicator
  dt-bindings: mailbox: Convert mtk-gce to DT schema
  of: base: make of_device_compatible_match() accept const device node
  of: Fix "dma-ranges" handling for bus controllers
  of: fdt: Remove unused struct fdt_scan_status
  dt-bindings: display: st,stm32-dsi: Handle data-lanes in DSI port node
  dt-bindings: timer: Add power-domains for TI timer-dm on K3
  dt: Add a check for undocumented compatible strings in kernel
  kbuild: take into account DT_SCHEMA_FILES changes while checking dtbs
  dt-bindings: interrupt-controller: migrate MIPS CPU interrupt controller text bindings to YAML
  dt-bindings: i2c: migrate mt7621 text bindings to YAML
  dt-bindings: power: gpcv2: correct patternProperties
  dt-bindings: virtio: Convert virtio,pci-iommu to DT schema
  dt-bindings: timer: arm,arch_timer: Allow dual compatible string
  dt-bindings: arm: cpus: Add kryo240 compatible
  dt-bindings: display: bridge: nxp,tda998x: Convert to json-schema
  dt-bindings: nvmem: u-boot,env: add basic NVMEM cells
  dt-bindings: remoteproc: qcom,adsp: enforce smd-edge schema
  ...
2022-10-10 13:13:51 -07:00
Linus Torvalds 8afc66e8d4 Kbuild updates for v6.1
- Remove potentially incomplete targets when Kbuid is interrupted by
    SIGINT etc. in case GNU Make may miss to do that when stderr is piped
    to another program.
 
  - Rewrite the single target build so it works more correctly.
 
  - Fix rpm-pkg builds with V=1.
 
  - List top-level subdirectories in ./Kbuild.
 
  - Ignore auto-generated __kstrtab_* and __kstrtabns_* symbols in kallsyms.
 
  - Avoid two different modules in lib/zstd/ having shared code, which
    potentially causes building the common code as build-in and modular
    back-and-forth.
 
  - Unify two modpost invocations to optimize the build process.
 
  - Remove head-y syntax in favor of linker scripts for placing particular
    sections in the head of vmlinux.
 
  - Bump the minimal GNU Make version to 3.82.
 
  - Clean up misc Makefiles and scripts.
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Merge tag 'kbuild-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:

 - Remove potentially incomplete targets when Kbuid is interrupted by
   SIGINT etc in case GNU Make may miss to do that when stderr is piped
   to another program.

 - Rewrite the single target build so it works more correctly.

 - Fix rpm-pkg builds with V=1.

 - List top-level subdirectories in ./Kbuild.

 - Ignore auto-generated __kstrtab_* and __kstrtabns_* symbols in
   kallsyms.

 - Avoid two different modules in lib/zstd/ having shared code, which
   potentially causes building the common code as build-in and modular
   back-and-forth.

 - Unify two modpost invocations to optimize the build process.

 - Remove head-y syntax in favor of linker scripts for placing
   particular sections in the head of vmlinux.

 - Bump the minimal GNU Make version to 3.82.

 - Clean up misc Makefiles and scripts.

* tag 'kbuild-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (41 commits)
  docs: bump minimal GNU Make version to 3.82
  ia64: simplify esi object addition in Makefile
  Revert "kbuild: Check if linker supports the -X option"
  kbuild: rebuild .vmlinux.export.o when its prerequisite is updated
  kbuild: move modules.builtin(.modinfo) rules to Makefile.vmlinux_o
  zstd: Fixing mixed module-builtin objects
  kallsyms: ignore __kstrtab_* and __kstrtabns_* symbols
  kallsyms: take the input file instead of reading stdin
  kallsyms: drop duplicated ignore patterns from kallsyms.c
  kbuild: reuse mksysmap output for kallsyms
  mksysmap: update comment about __crc_*
  kbuild: remove head-y syntax
  kbuild: use obj-y instead extra-y for objects placed at the head
  kbuild: hide error checker logs for V=1 builds
  kbuild: re-run modpost when it is updated
  kbuild: unify two modpost invocations
  kbuild: move vmlinux.o rule to the top Makefile
  kbuild: move .vmlinux.objs rule to Makefile.modpost
  kbuild: list sub-directories in ./Kbuild
  Makefile.compiler: replace cc-ifversion with compiler-specific macros
  ...
2022-10-10 12:00:45 -07:00
Linus Torvalds d0989d01c6 hardening updates for v6.1-rc1
Various fixes across several hardening areas:
 
 - loadpin: Fix verity target enforcement (Matthias Kaehlcke).
 
 - zero-call-used-regs: Add missing clobbers in paravirt (Bill Wendling).
 
 - CFI: clean up sparc function pointer type mismatches (Bart Van Assche).
 
 - Clang: Adjust compiler flag detection for various Clang changes (Sami
   Tolvanen, Kees Cook).
 
 - fortify: Fix warnings in arch-specific code in sh, ARM, and xen.
 
 Improvements to existing features:
 
 - testing: improve overflow KUnit test, introduce fortify KUnit test,
   add more coverage to LKDTM tests (Bart Van Assche, Kees Cook).
 
 - overflow: Relax overflow type checking for wider utility.
 
 New features:
 
 - string: Introduce strtomem() and strtomem_pad() to fill a gap in
   strncpy() replacement needs.
 
 - um: Enable FORTIFY_SOURCE support.
 
 - fortify: Enable run-time struct member memcpy() overflow warning.
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Merge tag 'hardening-v6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull kernel hardening updates from Kees Cook:
 "Most of the collected changes here are fixes across the tree for
  various hardening features (details noted below).

  The most notable new feature here is the addition of the memcpy()
  overflow warning (under CONFIG_FORTIFY_SOURCE), which is the next step
  on the path to killing the common class of "trivially detectable"
  buffer overflow conditions (i.e. on arrays with sizes known at compile
  time) that have resulted in many exploitable vulnerabilities over the
  years (e.g. BleedingTooth).

  This feature is expected to still have some undiscovered false
  positives. It's been in -next for a full development cycle and all the
  reported false positives have been fixed in their respective trees.
  All the known-bad code patterns we could find with Coccinelle are also
  either fixed in their respective trees or in flight.

  The commit message in commit 54d9469bc5 ("fortify: Add run-time WARN
  for cross-field memcpy()") for the feature has extensive details, but
  I'll repeat here that this is a warning _only_, and is not intended to
  actually block overflows (yet). The many patches fixing array sizes
  and struct members have been landing for several years now, and we're
  finally able to turn this on to find any remaining stragglers.

  Summary:

  Various fixes across several hardening areas:

   - loadpin: Fix verity target enforcement (Matthias Kaehlcke).

   - zero-call-used-regs: Add missing clobbers in paravirt (Bill
     Wendling).

   - CFI: clean up sparc function pointer type mismatches (Bart Van
     Assche).

   - Clang: Adjust compiler flag detection for various Clang changes
     (Sami Tolvanen, Kees Cook).

   - fortify: Fix warnings in arch-specific code in sh, ARM, and xen.

  Improvements to existing features:

   - testing: improve overflow KUnit test, introduce fortify KUnit test,
     add more coverage to LKDTM tests (Bart Van Assche, Kees Cook).

   - overflow: Relax overflow type checking for wider utility.

  New features:

   - string: Introduce strtomem() and strtomem_pad() to fill a gap in
     strncpy() replacement needs.

   - um: Enable FORTIFY_SOURCE support.

   - fortify: Enable run-time struct member memcpy() overflow warning"

* tag 'hardening-v6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: (27 commits)
  Makefile.extrawarn: Move -Wcast-function-type-strict to W=1
  hardening: Remove Clang's enable flag for -ftrivial-auto-var-init=zero
  sparc: Unbreak the build
  x86/paravirt: add extra clobbers with ZERO_CALL_USED_REGS enabled
  x86/paravirt: clean up typos and grammaros
  fortify: Convert to struct vs member helpers
  fortify: Explicitly check bounds are compile-time constants
  x86/entry: Work around Clang __bdos() bug
  ARM: decompressor: Include .data.rel.ro.local
  fortify: Adjust KUnit test for modular build
  sh: machvec: Use char[] for section boundaries
  kunit/memcpy: Avoid pathological compile-time string size
  lib: Improve the is_signed_type() kunit test
  LoadPin: Require file with verity root digests to have a header
  dm: verity-loadpin: Only trust verity targets with enforcement
  LoadPin: Fix Kconfig doc about format of file with verity digests
  um: Enable FORTIFY_SOURCE
  lkdtm: Update tests for memcpy() run-time warnings
  fortify: Add run-time WARN for cross-field memcpy()
  fortify: Use SIZE_MAX instead of (size_t)-1
  ...
2022-10-03 17:24:22 -07:00
Linus Torvalds 865dad2022 kcfi updates for v6.1-rc1
This replaces the prior support for Clang's standard Control Flow
 Integrity (CFI) instrumentation, which has required a lot of special
 conditions (e.g. LTO) and work-arounds. The current implementation
 ("Kernel CFI") is specific to C, directly designed for the Linux kernel,
 and takes advantage of architectural features like x86's IBT. This
 series retains arm64 support and adds x86 support. Additional "generic"
 architectural support is expected soon:
 https://github.com/samitolvanen/llvm-project/commits/kcfi_generic
 
 - treewide: Remove old CFI support details
 
 - arm64: Replace Clang CFI support with Clang KCFI support
 
 - x86: Introduce Clang KCFI support
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Merge tag 'kcfi-v6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull kcfi updates from Kees Cook:
 "This replaces the prior support for Clang's standard Control Flow
  Integrity (CFI) instrumentation, which has required a lot of special
  conditions (e.g. LTO) and work-arounds.

  The new implementation ("Kernel CFI") is specific to C, directly
  designed for the Linux kernel, and takes advantage of architectural
  features like x86's IBT. This series retains arm64 support and adds
  x86 support.

  GCC support is expected in the future[1], and additional "generic"
  architectural support is expected soon[2].

  Summary:

   - treewide: Remove old CFI support details

   - arm64: Replace Clang CFI support with Clang KCFI support

   - x86: Introduce Clang KCFI support"

Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107048 [1]
Link: https://github.com/samitolvanen/llvm-project/commits/kcfi_generic [2]

* tag 'kcfi-v6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: (22 commits)
  x86: Add support for CONFIG_CFI_CLANG
  x86/purgatory: Disable CFI
  x86: Add types to indirectly called assembly functions
  x86/tools/relocs: Ignore __kcfi_typeid_ relocations
  kallsyms: Drop CONFIG_CFI_CLANG workarounds
  objtool: Disable CFI warnings
  objtool: Preserve special st_shndx indexes in elf_update_symbol
  treewide: Drop __cficanonical
  treewide: Drop WARN_ON_FUNCTION_MISMATCH
  treewide: Drop function_nocfi
  init: Drop __nocfi from __init
  arm64: Drop unneeded __nocfi attributes
  arm64: Add CFI error handling
  arm64: Add types to indirect called assembly functions
  psci: Fix the function type for psci_initcall_t
  lkdtm: Emit an indirect call for CFI tests
  cfi: Add type helper macros
  cfi: Switch to -fsanitize=kcfi
  cfi: Drop __CFI_ADDRESSABLE
  cfi: Remove CONFIG_CFI_CLANG_SHADOW
  ...
2022-10-03 17:11:07 -07:00
Linus Torvalds 8aebac8293 Rust introduction for v6.1-rc1
The initial support of Rust-for-Linux comes in roughly 4 areas:
 
 - Kernel internals (kallsyms expansion for Rust symbols, %pA format)
 
 - Kbuild infrastructure (Rust build rules and support scripts)
 
 - Rust crates and bindings for initial minimum viable build
 
 - Rust kernel documentation and samples
 
 Rust support has been in linux-next for a year and a half now, and the
 short log doesn't do justice to the number of people who have contributed
 both to the Linux kernel side but also to the upstream Rust side to
 support the kernel's needs. Thanks to these 173 people, and many more,
 who have been involved in all kinds of ways:
 
 Miguel Ojeda, Wedson Almeida Filho, Alex Gaynor, Boqun Feng, Gary Guo,
 Björn Roy Baron, Andreas Hindborg, Adam Bratschi-Kaye, Benno Lossin,
 Maciej Falkowski, Finn Behrens, Sven Van Asbroeck, Asahi Lina, FUJITA
 Tomonori, John Baublitz, Wei Liu, Geoffrey Thomas, Philip Herron,
 Arthur Cohen, David Faust, Antoni Boucher, Philip Li, Yujie Liu,
 Jonathan Corbet, Greg Kroah-Hartman, Paul E. McKenney, Josh Triplett,
 Kent Overstreet, David Gow, Alice Ryhl, Robin Randhawa, Kees Cook,
 Nick Desaulniers, Matthew Wilcox, Linus Walleij, Joe Perches, Michael
 Ellerman, Petr Mladek, Masahiro Yamada, Arnaldo Carvalho de Melo,
 Andrii Nakryiko, Konstantin Shelekhin, Rasmus Villemoes, Konstantin
 Ryabitsev, Stephen Rothwell, Andy Shevchenko, Sergey Senozhatsky, John
 Paul Adrian Glaubitz, David Laight, Nathan Chancellor, Jonathan
 Cameron, Daniel Latypov, Shuah Khan, Brendan Higgins, Julia Lawall,
 Laurent Pinchart, Geert Uytterhoeven, Akira Yokosawa, Pavel Machek,
 David S. Miller, John Hawley, James Bottomley, Arnd Bergmann,
 Christian Brauner, Dan Robertson, Nicholas Piggin, Zhouyi Zhou, Elena
 Zannoni, Jose E. Marchesi, Leon Romanovsky, Will Deacon, Richard
 Weinberger, Randy Dunlap, Paolo Bonzini, Roland Dreier, Mark Brown,
 Sasha Levin, Ted Ts'o, Steven Rostedt, Jarkko Sakkinen, Michal
 Kubecek, Marco Elver, Al Viro, Keith Busch, Johannes Berg, Jan Kara,
 David Sterba, Connor Kuehl, Andy Lutomirski, Andrew Lunn, Alexandre
 Belloni, Peter Zijlstra, Russell King, Eric W. Biederman, Willy
 Tarreau, Christoph Hellwig, Emilio Cobos Álvarez, Christian Poveda,
 Mark Rousskov, John Ericson, TennyZhuang, Xuanwo, Daniel Paoliello,
 Manish Goregaokar, comex, Josh Stone, Stephan Sokolow, Philipp Krones,
 Guillaume Gomez, Joshua Nelson, Mats Larsen, Marc Poulhiès, Samantha
 Miller, Esteban Blanc, Martin Schmidt, Martin Rodriguez Reboredo,
 Daniel Xu, Viresh Kumar, Bartosz Golaszewski, Vegard Nossum, Milan
 Landaverde, Dariusz Sosnowski, Yuki Okushi, Matthew Bakhtiari, Wu
 XiangCheng, Tiago Lam, Boris-Chengbiao Zhou, Sumera Priyadarsini,
 Viktor Garske, Niklas Mohrin, Nándor István Krácser, Morgan Bartlett,
 Miguel Cano, Léo Lanteri Thauvin, Julian Merkle, Andreas Reindl,
 Jiapeng Chong, Fox Chen, Douglas Su, Antonio Terceiro, SeongJae Park,
 Sergio González Collado, Ngo Iok Ui (Wu Yu Wei), Joshua Abraham,
 Milan, Daniel Kolsoi, ahomescu, Manas, Luis Gerhorst, Li Hongyu,
 Philipp Gesang, Russell Currey, Jalil David Salamé Messina, Jon Olson,
 Raghvender, Angelos, Kaviraj Kanagaraj, Paul Römer, Sladyn Nunes,
 Mauro Baladés, Hsiang-Cheng Yang, Abhik Jain, Hongyu Li, Sean Nash,
 Yuheng Su, Peng Hao, Anhad Singh, Roel Kluin, Sara Saa, Geert
 Stappers, Garrett LeSage, IFo Hancroft, and Linus Torvalds.
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Merge tag 'rust-v6.1-rc1' of https://github.com/Rust-for-Linux/linux

Pull Rust introductory support from Kees Cook:
 "The tree has a recent base, but has fundamentally been in linux-next
  for a year and a half[1]. It's been updated based on feedback from the
  Kernel Maintainer's Summit, and to gain recent Reviewed-by: tags.

  Miguel is the primary maintainer, with me helping where needed/wanted.
  Our plan is for the tree to switch to the standard non-rebasing
  practice once this initial infrastructure series lands.

  The contents are the absolute minimum to get Rust code building in the
  kernel, with many more interfaces[2] (and drivers - NVMe[3], 9p[4], M1
  GPU[5]) on the way.

  The initial support of Rust-for-Linux comes in roughly 4 areas:

   - Kernel internals (kallsyms expansion for Rust symbols, %pA format)

   - Kbuild infrastructure (Rust build rules and support scripts)

   - Rust crates and bindings for initial minimum viable build

   - Rust kernel documentation and samples

  Rust support has been in linux-next for a year and a half now, and the
  short log doesn't do justice to the number of people who have
  contributed both to the Linux kernel side but also to the upstream
  Rust side to support the kernel's needs. Thanks to these 173 people,
  and many more, who have been involved in all kinds of ways:

  Miguel Ojeda, Wedson Almeida Filho, Alex Gaynor, Boqun Feng, Gary Guo,
  Björn Roy Baron, Andreas Hindborg, Adam Bratschi-Kaye, Benno Lossin,
  Maciej Falkowski, Finn Behrens, Sven Van Asbroeck, Asahi Lina, FUJITA
  Tomonori, John Baublitz, Wei Liu, Geoffrey Thomas, Philip Herron,
  Arthur Cohen, David Faust, Antoni Boucher, Philip Li, Yujie Liu,
  Jonathan Corbet, Greg Kroah-Hartman, Paul E. McKenney, Josh Triplett,
  Kent Overstreet, David Gow, Alice Ryhl, Robin Randhawa, Kees Cook,
  Nick Desaulniers, Matthew Wilcox, Linus Walleij, Joe Perches, Michael
  Ellerman, Petr Mladek, Masahiro Yamada, Arnaldo Carvalho de Melo,
  Andrii Nakryiko, Konstantin Shelekhin, Rasmus Villemoes, Konstantin
  Ryabitsev, Stephen Rothwell, Andy Shevchenko, Sergey Senozhatsky, John
  Paul Adrian Glaubitz, David Laight, Nathan Chancellor, Jonathan
  Cameron, Daniel Latypov, Shuah Khan, Brendan Higgins, Julia Lawall,
  Laurent Pinchart, Geert Uytterhoeven, Akira Yokosawa, Pavel Machek,
  David S. Miller, John Hawley, James Bottomley, Arnd Bergmann,
  Christian Brauner, Dan Robertson, Nicholas Piggin, Zhouyi Zhou, Elena
  Zannoni, Jose E. Marchesi, Leon Romanovsky, Will Deacon, Richard
  Weinberger, Randy Dunlap, Paolo Bonzini, Roland Dreier, Mark Brown,
  Sasha Levin, Ted Ts'o, Steven Rostedt, Jarkko Sakkinen, Michal
  Kubecek, Marco Elver, Al Viro, Keith Busch, Johannes Berg, Jan Kara,
  David Sterba, Connor Kuehl, Andy Lutomirski, Andrew Lunn, Alexandre
  Belloni, Peter Zijlstra, Russell King, Eric W. Biederman, Willy
  Tarreau, Christoph Hellwig, Emilio Cobos Álvarez, Christian Poveda,
  Mark Rousskov, John Ericson, TennyZhuang, Xuanwo, Daniel Paoliello,
  Manish Goregaokar, comex, Josh Stone, Stephan Sokolow, Philipp Krones,
  Guillaume Gomez, Joshua Nelson, Mats Larsen, Marc Poulhiès, Samantha
  Miller, Esteban Blanc, Martin Schmidt, Martin Rodriguez Reboredo,
  Daniel Xu, Viresh Kumar, Bartosz Golaszewski, Vegard Nossum, Milan
  Landaverde, Dariusz Sosnowski, Yuki Okushi, Matthew Bakhtiari, Wu
  XiangCheng, Tiago Lam, Boris-Chengbiao Zhou, Sumera Priyadarsini,
  Viktor Garske, Niklas Mohrin, Nándor István Krácser, Morgan Bartlett,
  Miguel Cano, Léo Lanteri Thauvin, Julian Merkle, Andreas Reindl,
  Jiapeng Chong, Fox Chen, Douglas Su, Antonio Terceiro, SeongJae Park,
  Sergio González Collado, Ngo Iok Ui (Wu Yu Wei), Joshua Abraham,
  Milan, Daniel Kolsoi, ahomescu, Manas, Luis Gerhorst, Li Hongyu,
  Philipp Gesang, Russell Currey, Jalil David Salamé Messina, Jon Olson,
  Raghvender, Angelos, Kaviraj Kanagaraj, Paul Römer, Sladyn Nunes,
  Mauro Baladés, Hsiang-Cheng Yang, Abhik Jain, Hongyu Li, Sean Nash,
  Yuheng Su, Peng Hao, Anhad Singh, Roel Kluin, Sara Saa, Geert
  Stappers, Garrett LeSage, IFo Hancroft, and Linus Torvalds"

Link: https://lwn.net/Articles/849849/ [1]
Link: https://github.com/Rust-for-Linux/linux/commits/rust [2]
Link: d88c3744d6 [3]
Link: 9367032607 [4]
Link: https://github.com/AsahiLinux/linux/commits/gpu/rust-wip [5]

* tag 'rust-v6.1-rc1' of https://github.com/Rust-for-Linux/linux: (27 commits)
  MAINTAINERS: Rust
  samples: add first Rust examples
  x86: enable initial Rust support
  docs: add Rust documentation
  Kbuild: add Rust support
  rust: add `.rustfmt.toml`
  scripts: add `is_rust_module.sh`
  scripts: add `rust_is_available.sh`
  scripts: add `generate_rust_target.rs`
  scripts: add `generate_rust_analyzer.py`
  scripts: decode_stacktrace: demangle Rust symbols
  scripts: checkpatch: enable language-independent checks for Rust
  scripts: checkpatch: diagnose uses of `%pA` in the C side as errors
  vsprintf: add new `%pA` format specifier
  rust: export generated symbols
  rust: add `kernel` crate
  rust: add `bindings` crate
  rust: add `macros` crate
  rust: add `compiler_builtins` crate
  rust: adapt `alloc` crate to the kernel
  ...
2022-10-03 16:39:37 -07:00
Alexander Potapenko f80be4571b kmsan: add KMSAN runtime core
For each memory location KernelMemorySanitizer maintains two types of
metadata:

1. The so-called shadow of that location - а byte:byte mapping describing
   whether or not individual bits of memory are initialized (shadow is 0)
   or not (shadow is 1).
2. The origins of that location - а 4-byte:4-byte mapping containing
   4-byte IDs of the stack traces where uninitialized values were
   created.

Each struct page now contains pointers to two struct pages holding KMSAN
metadata (shadow and origins) for the original struct page.  Utility
routines in mm/kmsan/core.c and mm/kmsan/shadow.c handle the metadata
creation, addressing, copying and checking.  mm/kmsan/report.c performs
error reporting in the cases an uninitialized value is used in a way that
leads to undefined behavior.

KMSAN compiler instrumentation is responsible for tracking the metadata
along with the kernel memory.  mm/kmsan/instrumentation.c provides the
implementation for instrumentation hooks that are called from files
compiled with -fsanitize=kernel-memory.

To aid parameter passing (also done at instrumentation level), each
task_struct now contains a struct kmsan_task_state used to track the
metadata of function parameters and return values for that task.

Finally, this patch provides CONFIG_KMSAN that enables KMSAN, and declares
CFLAGS_KMSAN, which are applied to files compiled with KMSAN.  The
KMSAN_SANITIZE:=n Makefile directive can be used to completely disable
KMSAN instrumentation for certain files.

Similarly, KMSAN_ENABLE_CHECKS:=n disables KMSAN checks and makes newly
created stack memory initialized.

Users can also use functions from include/linux/kmsan-checks.h to mark
certain memory regions as uninitialized or initialized (this is called
"poisoning" and "unpoisoning") or check that a particular region is
initialized.

Link: https://lkml.kernel.org/r/20220915150417.722975-12-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Acked-by: Marco Elver <elver@google.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Eric Biggers <ebiggers@kernel.org>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2022-10-03 14:03:19 -07:00
Linus Torvalds 4fe89d07dc Linux 6.0 2022-10-02 14:09:07 -07:00
Masahiro Yamada 0f1fe9d616 Revert "kbuild: Check if linker supports the -X option"
This reverts commit d79a27195a.

According to the commit description, this ld-option test was added for
the gold linker at that time.

Commit 75959d44f9 ("kbuild: Fail if gold linker is detected") gave
up the gold linker support after all.

I tested the BFD linker from binutils 2.23 and LLD from LLVM 11.0.0.
Both of them support the -X option.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2022-10-03 03:52:58 +09:00
Masahiro Yamada 5d4aeffbf7 kbuild: rebuild .vmlinux.export.o when its prerequisite is updated
When include/linux/export-internal.h is updated, .vmlinux.export.o
must be rebuilt, but it does not happen because its rule is hidden
behind scripts/link-vmlinux.sh.

Move it out of the shell script, so that Make can see the dependency
between vmlinux and .vmlinux.export.o.

Move the vmlinux rule to scripts/Makefile.vmlinux.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2022-10-03 03:52:58 +09:00
Masahiro Yamada 7a342e6c77 kbuild: move modules.builtin(.modinfo) rules to Makefile.vmlinux_o
Do not build modules.builtin(.modinfo) as a side-effect of vmlinux.

There are no good reason to rebuild them just because any of vmlinux's
prerequistes (vmlinux.lds, .vmlinux.export.c, etc.) has been updated.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2022-10-03 03:52:58 +09:00
Masahiro Yamada ce697ccee1 kbuild: remove head-y syntax
Kbuild puts the objects listed in head-y at the head of vmlinux.
Conventionally, we do this for head*.S, which contains the kernel entry
point.

A counter approach is to control the section order by the linker script.
Actually, the code marked as __HEAD goes into the ".head.text" section,
which is placed before the normal ".text" section.

I do not know if both of them are needed. From the build system
perspective, head-y is not mandatory. If you can achieve the proper code
placement by the linker script only, it would be cleaner.

I collected the current head-y objects into head-object-list.txt. It is
a whitelist. My hope is it will be reduced in the long run.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
2022-10-02 18:06:03 +09:00
Masahiro Yamada 3216484550 kbuild: use obj-y instead extra-y for objects placed at the head
The objects placed at the head of vmlinux need special treatments:

 - arch/$(SRCARCH)/Makefile adds them to head-y in order to place
   them before other archives in the linker command line.

 - arch/$(SRCARCH)/kernel/Makefile adds them to extra-y instead of
   obj-y to avoid them going into built-in.a.

This commit gets rid of the latter.

Create vmlinux.a to collect all the objects that are unconditionally
linked to vmlinux. The objects listed in head-y are moved to the head
of vmlinux.a by using 'ar m'.

With this, arch/$(SRCARCH)/kernel/Makefile can consistently use obj-y
for builtin objects.

There is no *.o that is directly linked to vmlinux. Drop unneeded code
in scripts/clang-tools/gen_compile_commands.py.

$(AR) mPi needs 'T' to workaround the llvm-ar bug. The fix was suggested
by Nathan Chancellor [1].

[1]: https://lore.kernel.org/llvm/YyjjT5gQ2hGMH0ni@dev-arch.thelio-3990X/

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
2022-10-02 18:04:05 +09:00
Kees Cook 607e57c6c6 hardening: Remove Clang's enable flag for -ftrivial-auto-var-init=zero
Now that Clang's -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
option is no longer required, remove it from the command line. Clang 16
and later will warn when it is used, which will cause Kconfig to think
it can't use -ftrivial-auto-var-init=zero at all. Check for whether it
is required and only use it when so.

Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: linux-kbuild@vger.kernel.org
Cc: llvm@lists.linux.dev
Cc: stable@vger.kernel.org
Fixes: f02003c860 ("hardening: Avoid harmless Clang option under CONFIG_INIT_STACK_ALL_ZERO")
Signed-off-by: Kees Cook <keescook@chromium.org>
2022-09-29 23:05:00 -07:00
Masahiro Yamada 4b09865900 kbuild: hide error checker logs for V=1 builds
V=1 (verbose build) shows commands executed by Make, but it may cause
misunderstanding.

For example, the following command shows the outstanding error message.

  $ make V=1 INSTALL_PATH=/tmp install
  test -e include/generated/autoconf.h -a -e include/config/auto.conf || (                \
  echo >&2;                                                       \
  echo >&2 "  ERROR: Kernel configuration is invalid.";           \
  echo >&2 "         include/generated/autoconf.h or include/config/auto.conf are missing.";\
  echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
  echo >&2 ;                                                      \
  /bin/false)
    unset sub_make_done; ./scripts/install.sh

It is not an error. Make just showed the recipe lines it has executed,
but people may think that 'make install' has failed.

Likewise, the combination of V=1 and O= shows confusing
"*** The source tree is not clean, please run 'make mrproper'".

Suppress such misleading logs.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
2022-09-29 06:08:18 +09:00
Masahiro Yamada f73edc8951 kbuild: unify two modpost invocations
Currently, modpost is executed twice; first for vmlinux, second
for modules.

This commit merges them.

Current build flow
==================

  1) build obj-y and obj-m objects
    2) link vmlinux.o
      3) modpost for vmlinux
        4) link vmlinux
          5) modpost for modules
            6) link modules (*.ko)

The build steps 1) through 6) are serialized, that is, modules are
built after vmlinux. You do not get benefits of parallel builds when
scripts/link-vmlinux.sh is being run.

New build flow
==============

  1) build obj-y and obj-m objects
    2) link vmlinux.o
      3) modpost for vmlinux and modules
        4a) link vmlinux
        4b) link modules (*.ko)

In the new build flow, modpost is invoked just once.

vmlinux and modules are built in parallel. One exception is
CONFIG_DEBUG_INFO_BTF_MODULES=y, where modules depend on vmlinux.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
2022-09-29 06:07:58 +09:00
Masahiro Yamada 9c5a0ac3c3 kbuild: move vmlinux.o rule to the top Makefile
Move the build rules of vmlinux.o out of scripts/link-vmlinux.sh to
clearly separate 1) pre-modpost, 2) modpost, 3) post-modpost stages.
This will make further refactoring possible.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
2022-09-29 04:42:34 +09:00
Masahiro Yamada 26ef40de5c kbuild: move .vmlinux.objs rule to Makefile.modpost
.vmlinux.objs is used by modpost, so scripts/Makefile.modpost is
a better place to generate it.

It is used only when CONFIG_MODVERSIONS=y. It should be guarded
by "ifdef CONFIG_MODVERSIONS".

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
2022-09-29 04:42:00 +09:00
Masahiro Yamada 5750121ae7 kbuild: list sub-directories in ./Kbuild
Use the ordinary obj-y syntax to list subdirectories.

Note1:
Previously, the link order of lib-y depended on CONFIG_MODULES; lib-y
was linked before drivers-y when CONFIG_MODULES=y, otherwise after
drivers-y. This was a bug of commit 7273ad2b08 ("kbuild: link lib-y
objects to vmlinux forcibly when CONFIG_MODULES=y"), but it was not a
big deal after all. Now, all objects listed in lib-y are linked last,
irrespective of CONFIG_MODULES.

Note2:
Finally, the single target build in arch/*/lib/ works correctly. There was
a bug report about this. [1]

  $ make ARCH=arm arch/arm/lib/findbit.o
    CALL    scripts/checksyscalls.sh
    AS      arch/arm/lib/findbit.o

[1]: https://lore.kernel.org/linux-kbuild/YvUQOwL6lD4%2F5%2FU6@shell.armlinux.org.uk/

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
2022-09-29 04:41:31 +09:00
Nick Desaulniers 88b61e3bff Makefile.compiler: replace cc-ifversion with compiler-specific macros
cc-ifversion is GCC specific. Replace it with compiler specific
variants. Update the users of cc-ifversion to use these new macros.

Link: https://github.com/ClangBuiltLinux/linux/issues/350
Link: https://lore.kernel.org/llvm/CAGG=3QWSAUakO42kubrCap8fp-gm1ERJJAYXTnP1iHk_wrH=BQ@mail.gmail.com/
Suggested-by: Bill Wendling <morbo@google.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2022-09-29 04:40:16 +09:00
Masahiro Yamada cc306abd19 kbuild: fix and refactor single target build
The single target build has a subtle bug for the combination for
an individual file and a subdirectory.

[1] 'make kernel/fork.i' builds only kernel/fork.i

  $ make kernel/fork.i
    CALL    scripts/checksyscalls.sh
    DESCEND objtool
    CPP     kernel/fork.i

[2] 'make kernel/' builds only under the kernel/ directory.

  $ make kernel/
    CALL    scripts/checksyscalls.sh
    DESCEND objtool
    CC      kernel/fork.o
    CC      kernel/exec_domain.o
       [snip]
    CC      kernel/rseq.o
    AR      kernel/built-in.a

But, if you try to do [1] and [2] in a single command, you will get
only [1] with a weird log:

  $ make kernel/fork.i kernel/
    CALL    scripts/checksyscalls.sh
    DESCEND objtool
    CPP     kernel/fork.i
  make[2]: Nothing to be done for 'kernel/'.

With 'make kernel/fork.i kernel/', you should get both [1] and [2].

Rewrite the single target build.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2022-09-29 04:40:15 +09:00
Masahiro Yamada a55f283e8b kbuild: generate include/generated/compile.h in top Makefile
Now that UTS_VERSION was separated out, this header can be generated
much earlier, and probably the top Makefile is a better place to do it
than init/Makefile.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2022-09-29 04:40:15 +09:00
Masahiro Yamada 7f37181393 kbuild: move 'PHONY += modules_prepare' to the common part
Unify the code between in-tree builds and external module builds.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2022-09-29 04:40:15 +09:00
Masahiro Yamada f110e5a250 kbuild: refactor single builds of *.ko
Remove the potentially invalid modules.order instead of using
the temporary file.

Also, KBUILD_MODULES is don't care for single builds. No need to
cancel it.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2022-09-29 04:40:15 +09:00
Masahiro Yamada f75a03340c kbuild: remove duplicated dependency between modules and modules_check
The dependency, "modules: modules_check" is specified twice.
Commit 1a998be620 ("kbuild: check module name conflict for external
modules as well") missed to clean it up.

'PHONY += modules' also appears twice.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2022-09-29 04:40:15 +09:00
Masahiro Yamada d724b578a1 kbuild: do not deduplicate modules.order
The AWK code was added to deduplicate modules.order in case $(obj-m)
contains the same module multiple times, but it is actually unneeded
since commit b2c8855491 ("kbuild: update modules.order only when
contained modules are updated").

The list is already deduplicated before being processed by AWK because
$^ is the deduplicated list of prerequisites.
(Please note the real-prereqs macro uses $^)

Yet, modules.order will contain duplication if two different Makefiles
build the same module:

  foo/Makefile:

      obj-m += bar/baz.o

  foo/bar/Makefile:

      obj-m += baz.o

However, the parallel builds cannot properly handle this case in the
first place. So, it is better to let it fail (as already done by
scripts/modules-check.sh).

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2022-09-29 04:40:14 +09:00
Masahiro Yamada b10fdeea8c kbuild: check sha1sum just once for each atomic header
It is unneeded to check the sha1sum every time.

Create the timestamp files to manage it.

Add '.' to clean-dirs because 'make clean' must visit ./Kbuild to
clean up the timestamp files.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2022-09-29 04:40:14 +09:00
Masahiro Yamada a3c4d4abaa kbuild: hard-code KBUILD_ALLDIRS in scripts/Makefile.package
My future plan is to list subdirectories in ./Kbuild. When it occurs,
$(vmlinux-alldirs) will not contain all subdirectories.

Let's hard-code the directory list until I get around to implementing
a more sophisticated way for generating a source tarball.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
2022-09-29 04:38:57 +09:00
Masahiro Yamada ed7ceac157 kbuild: add phony targets to ./Kbuild
missing-syscalls and old-atomics are meant to be phony targets.
Adding them to always-y is odd. (always-y should generate something).

Add a new phony target 'prepare', which depends on all the other.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2022-09-29 02:00:29 +09:00
Miguel Ojeda 2f7ab1267d Kbuild: add Rust support
Having most of the new files in place, we now enable Rust support
in the build system, including `Kconfig` entries related to Rust,
the Rust configuration printer and a few other bits.

Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com>
Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com>
Co-developed-by: Finn Behrens <me@kloenk.de>
Signed-off-by: Finn Behrens <me@kloenk.de>
Co-developed-by: Adam Bratschi-Kaye <ark.email@gmail.com>
Signed-off-by: Adam Bratschi-Kaye <ark.email@gmail.com>
Co-developed-by: Wedson Almeida Filho <wedsonaf@google.com>
Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com>
Co-developed-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Co-developed-by: Sven Van Asbroeck <thesven73@gmail.com>
Signed-off-by: Sven Van Asbroeck <thesven73@gmail.com>
Co-developed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Gary Guo <gary@garyguo.net>
Co-developed-by: Boris-Chengbiao Zhou <bobo1239@web.de>
Signed-off-by: Boris-Chengbiao Zhou <bobo1239@web.de>
Co-developed-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Co-developed-by: Douglas Su <d0u9.su@outlook.com>
Signed-off-by: Douglas Su <d0u9.su@outlook.com>
Co-developed-by: Dariusz Sosnowski <dsosnowski@dsosnowski.pl>
Signed-off-by: Dariusz Sosnowski <dsosnowski@dsosnowski.pl>
Co-developed-by: Antonio Terceiro <antonio.terceiro@linaro.org>
Signed-off-by: Antonio Terceiro <antonio.terceiro@linaro.org>
Co-developed-by: Daniel Xu <dxu@dxuuu.xyz>
Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
Co-developed-by: Björn Roy Baron <bjorn3_gh@protonmail.com>
Signed-off-by: Björn Roy Baron <bjorn3_gh@protonmail.com>
Co-developed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Signed-off-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2022-09-28 09:02:20 +02:00
Rob Herring b6acf80735 dt: Add a check for undocumented compatible strings in kernel
Add a make target, dt_compatible_check, to extract compatible strings
from kernel sources and check if they are documented by a schema.
At least version v2022.08 of dtschema with dt-check-compatible is
required.

This check can also be run manually on specific files or directories:

scripts/dtc/dt-extract-compatibles drivers/clk/ | \
  xargs dt-check-compatible -v -s Documentation/devicetree/bindings/processed-schema.json

Currently, there are about 3800 undocumented compatible strings. Most of
these are cases where the binding is not yet converted (given there
are 1900 .txt binding files remaining).

Link: https://lore.kernel.org/all/20220916012510.2718170-1-robh@kernel.org/
Signed-off-by: Rob Herring <robh@kernel.org>
2022-09-27 10:36:16 -05:00
Sami Tolvanen 8924560094 cfi: Switch to -fsanitize=kcfi
Switch from Clang's original forward-edge control-flow integrity
implementation to -fsanitize=kcfi, which is better suited for the
kernel, as it doesn't require LTO, doesn't use a jump table that
requires altering function references, and won't break cross-module
function address equality.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Kees Cook <keescook@chromium.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220908215504.3686827-6-samitolvanen@google.com
2022-09-26 10:13:13 -07:00
Linus Torvalds f76349cf41 Linux 6.0-rc7 2022-09-25 14:01:02 -07:00
Linus Torvalds 521a547ced Linux 6.0-rc6 2022-09-18 13:44:14 -07:00
Linus Torvalds 80e78fcce8 Linux 6.0-rc5 2022-09-11 16:22:01 -04:00
Linus Torvalds 4ed9c1e971 Kbuild fixes for v6.0 (2nd)
- Remove unused scripts/gcc-ld script
 
  - Add zstd support to scripts/extract-ikconfig
 
  - Check 'make headers' for UML
 
  - Fix scripts/mksysmap to ignore local symbols
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Merge tag 'kbuild-fixes-v6.0-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild fixes from Masahiro Yamada:

 - Remove unused scripts/gcc-ld script

 - Add zstd support to scripts/extract-ikconfig

 - Check 'make headers' for UML

 - Fix scripts/mksysmap to ignore local symbols

* tag 'kbuild-fixes-v6.0-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  mksysmap: Fix the mismatch of 'L0' symbols in System.map
  kbuild: disable header exports for UML in a straightforward way
  scripts/extract-ikconfig: add zstd compression support
  scripts: remove obsolete gcc-ld script
2022-09-11 15:16:47 -04:00
Linus Torvalds 7e18e42e4b Linux 6.0-rc4 2022-09-04 13:10:01 -07:00
Masahiro Yamada 1b620d539c kbuild: disable header exports for UML in a straightforward way
Previously 'make ARCH=um headers' stopped because of missing
arch/um/include/uapi/asm/Kbuild.

The error is not shown since commit ed102bf2af ("um: Fix W=1
missing-include-dirs warnings") added arch/um/include/uapi/asm/Kbuild.

Hard-code the unsupported architecture, so it works like before.

Fixes: ed102bf2af ("um: Fix W=1 missing-include-dirs warnings")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Richard Weinberger <richard@nod.at>
2022-09-02 00:14:30 +09:00
Linus Torvalds b90cb10531 Linux 6.0-rc3 2022-08-28 15:05:29 -07:00
Linus Torvalds 1c23f9e627 Linux 6.0-rc2 2022-08-21 17:32:54 -07:00
Masahiro Yamada 113147510b kbuild: fix the modules order between drivers and libs
Commit b2c8855491 ("kbuild: update modules.order only when contained
modules are updated") accidentally changed the modules order.

Prior to that commit, the modules order was determined based on
vmlinux-dirs, which lists core-y/m, drivers-y/m, libs-y/m, in this order.

Now, subdir-modorder lists them in a different order: core-y/m, libs-y/m,
drivers-y/m.

Presumably, there was no practical issue because the modules in drivers
and libs are orthogonal, but there is no reason to have this distortion.

Get back to the original order.

Fixes: b2c8855491 ("kbuild: update modules.order only when contained modules are updated")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2022-08-21 02:47:49 +09:00
Linus Torvalds 568035b01c Linux 6.0-rc1 2022-08-14 15:50:18 -07:00
Nick Desaulniers 0d362be5b1 Makefile: link with -z noexecstack --no-warn-rwx-segments
Users of GNU ld (BFD) from binutils 2.39+ will observe multiple
instances of a new warning when linking kernels in the form:

  ld: warning: vmlinux: missing .note.GNU-stack section implies executable stack
  ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
  ld: warning: vmlinux has a LOAD segment with RWX permissions

Generally, we would like to avoid the stack being executable.  Because
there could be a need for the stack to be executable, assembler sources
have to opt-in to this security feature via explicit creation of the
.note.GNU-stack feature (which compilers create by default) or command
line flag --noexecstack.  Or we can simply tell the linker the
production of such sections is irrelevant and to link the stack as
--noexecstack.

LLVM's LLD linker defaults to -z noexecstack, so this flag isn't
strictly necessary when linking with LLD, only BFD, but it doesn't hurt
to be explicit here for all linkers IMO.  --no-warn-rwx-segments is
currently BFD specific and only available in the current latest release,
so it's wrapped in an ld-option check.

While the kernel makes extensive usage of ELF sections, it doesn't use
permissions from ELF segments.

Link: https://lore.kernel.org/linux-block/3af4127a-f453-4cf7-f133-a181cce06f73@kernel.dk/
Link: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=ba951afb99912da01a6e8434126b8fac7aa75107
Link: https://github.com/llvm/llvm-project/issues/57009
Reported-and-tested-by: Jens Axboe <axboe@kernel.dk>
Suggested-by: Fangrui Song <maskray@google.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-08-10 18:29:34 -07:00
Linus Torvalds 0af5cb349a Kbuild updates for v5.20
- Remove the support for -O3 (CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3)
 
  - Fix error of rpm-pkg cross-builds
 
  - Support riscv for checkstack tool
 
  - Re-enable -Wformwat warnings for Clang
 
  - Clean up modpost, Makefiles, and misc scripts
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Merge tag 'kbuild-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:

 - Remove the support for -O3 (CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3)

 - Fix error of rpm-pkg cross-builds

 - Support riscv for checkstack tool

 - Re-enable -Wformwat warnings for Clang

 - Clean up modpost, Makefiles, and misc scripts

* tag 'kbuild-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (30 commits)
  modpost: remove .symbol_white_list field entirely
  modpost: remove unneeded .symbol_white_list initializers
  modpost: add PATTERNS() helper macro
  modpost: shorten warning messages in report_sec_mismatch()
  Revert "Kbuild, lto, workaround: Don't warn for initcall_reference in modpost"
  modpost: use more reliable way to get fromsec in section_rel(a)()
  modpost: add array range check to sec_name()
  modpost: refactor get_secindex()
  kbuild: set EXIT trap before creating temporary directory
  modpost: remove unused Elf_Sword macro
  Makefile.extrawarn: re-enable -Wformat for clang
  kbuild: add dtbs_prepare target
  kconfig: Qt5: tell the user which packages are required
  modpost: use sym_get_data() to get module device_table data
  modpost: drop executable ELF support
  checkstack: add riscv support for scripts/checkstack.pl
  kconfig: shorten the temporary directory name for cc-option
  scripts: headers_install.sh: Update config leak ignore entries
  kbuild: error out if $(INSTALL_MOD_PATH) contains % or :
  kbuild: error out if $(KBUILD_EXTMOD) contains % or :
  ...
2022-08-10 10:40:41 -07:00
Linus Torvalds e05d5b9c5b linux-kselftest-next-5.20-rc1
This Kselftest update for Linux 5.20-rc1 consists of:
 
 - timers test build fixes and cleanups for new tool chains
 - removing khdr from kselftest framework and main Makefile
 - changes to test output messages to improve reports
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Merge tag 'linux-kselftest-next-5.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull Kselftest updates from Shuah Khan:

 - timers test build fixes and cleanups for new tool chains

 - removing khdr from kselftest framework and main Makefile

 - changes to test output messages to improve reports

* tag 'linux-kselftest-next-5.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (24 commits)
  Makefile: replace headers_install with headers for kselftest
  selftests/landlock: drop deprecated headers dependency
  selftests: timers: clocksource-switch: adapt to kselftest framework
  selftests: timers: clocksource-switch: add 'runtime' command line parameter
  selftests: timers: clocksource-switch: add command line switch to skip sanity check
  selftests: timers: clocksource-switch: sort includes
  selftests: timers: clocksource-switch: fix passing errors from child
  selftests: timers: inconsistency-check: adapt to kselftest framework
  selftests: timers: nanosleep: adapt to kselftest framework
  selftests: timers: fix declarations of main()
  selftests: timers: valid-adjtimex: build fix for newer toolchains
  Makefile: add headers_install to kselftest targets
  selftests: drop KSFT_KHDR_INSTALL make target
  selftests: stop using KSFT_KHDR_INSTALL
  selftests: drop khdr make target
  selftests: drivers/dma-buf: Improve message in selftest summary
  selftests/kcmp: Make the test output consistent and clear
  selftests:timers: globals don't need initialization to 0
  selftests/drivers/gpu: Add error messages to drm_mm.sh
  selftests/tpm2: increase timeout for kselftests
  ...
2022-08-02 19:44:56 -07:00
Linus Torvalds b349b1181d for-5.20/io_uring-2022-07-29
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Merge tag 'for-5.20/io_uring-2022-07-29' of git://git.kernel.dk/linux-block

Pull io_uring updates from Jens Axboe:

 - As per (valid) complaint in the last merge window, fs/io_uring.c has
   grown quite large these days. io_uring isn't really tied to fs
   either, as it supports a wide variety of functionality outside of
   that.

   Move the code to io_uring/ and split it into files that either
   implement a specific request type, and split some code into helpers
   as well. The code is organized a lot better like this, and io_uring.c
   is now < 4K LOC (me).

 - Deprecate the epoll_ctl opcode. It'll still work, just trigger a
   warning once if used. If we don't get any complaints on this, and I
   don't expect any, then we can fully remove it in a future release
   (me).

 - Improve the cancel hash locking (Hao)

 - kbuf cleanups (Hao)

 - Efficiency improvements to the task_work handling (Dylan, Pavel)

 - Provided buffer improvements (Dylan)

 - Add support for recv/recvmsg multishot support. This is similar to
   the accept (or poll) support for have for multishot, where a single
   SQE can trigger everytime data is received. For applications that
   expect to do more than a few receives on an instantiated socket, this
   greatly improves efficiency (Dylan).

 - Efficiency improvements for poll handling (Pavel)

 - Poll cancelation improvements (Pavel)

 - Allow specifiying a range for direct descriptor allocations (Pavel)

 - Cleanup the cqe32 handling (Pavel)

 - Move io_uring types to greatly cleanup the tracing (Pavel)

 - Tons of great code cleanups and improvements (Pavel)

 - Add a way to do sync cancelations rather than through the sqe -> cqe
   interface, as that's a lot easier to use for some use cases (me).

 - Add support to IORING_OP_MSG_RING for sending direct descriptors to a
   different ring. This avoids the usually problematic SCM case, as we
   disallow those. (me)

 - Make the per-command alloc cache we use for apoll generic, place
   limits on it, and use it for netmsg as well (me).

 - Various cleanups (me, Michal, Gustavo, Uros)

* tag 'for-5.20/io_uring-2022-07-29' of git://git.kernel.dk/linux-block: (172 commits)
  io_uring: ensure REQ_F_ISREG is set async offload
  net: fix compat pointer in get_compat_msghdr()
  io_uring: Don't require reinitable percpu_ref
  io_uring: fix types in io_recvmsg_multishot_overflow
  io_uring: Use atomic_long_try_cmpxchg in __io_account_mem
  io_uring: support multishot in recvmsg
  net: copy from user before calling __get_compat_msghdr
  net: copy from user before calling __copy_msghdr
  io_uring: support 0 length iov in buffer select in compat
  io_uring: fix multishot ending when not polled
  io_uring: add netmsg cache
  io_uring: impose max limit on apoll cache
  io_uring: add abstraction around apoll cache
  io_uring: move apoll cache to poll.c
  io_uring: consolidate hash_locked io-wq handling
  io_uring: clear REQ_F_HASH_LOCKED on hash removal
  io_uring: don't race double poll setting REQ_F_ASYNC_DATA
  io_uring: don't miss setting REQ_F_DOUBLE_POLL
  io_uring: disable multishot recvmsg
  io_uring: only trace one of complete or overflow
  ...
2022-08-02 13:20:44 -07:00
Linus Torvalds 3d7cb6b04c Linux 5.19 2022-07-31 14:03:01 -07:00