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936 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
Linus Torvalds
|
2e05544060 |
mm.git review status for mm-hotfixes-stable..mm-nonmm-stable
Everything:
Total patches: 108
Reviews/patch: 0.84
Reviewed rate: 75%
Patch series in this merge:
- The 2 patch series "taskstats: fix TGID dead-thread stat retention"
from Yiyang Chen fixes a taskstats TGID aggregation bug where fields
added in the TGID query path were not preserved after thread exit, and
adds a kselftest covering the regression.
- The 2 patch series "lib/tests: string_helpers: Slight improvements"
from Andy Shevchenko improves lib/tests/string_helpers_kunit.c a little.
- The 2 patch series "lib/base64: decode fixes" from Josh Law addreesses
minor issues in lib/base64.c.
- The 3 patch series "selftests/filelock: Make output more kselftestish"
from Mark Brown makes the output from the ofdlocks test a bit easier for
tooling to work with, and also ignores the generated file.
- The 3 patch series "uaccess: unify inline vs outline
copy_{from,to}_user() selection" from Yury Norov simplifies the usercopy
code by removing the selectability of inlining copy_{from,to}_user().
- The 5 patch series "ocfs2: validate inline xattr header consumers"
from ZhengYuan Huang fixes a number of possible issues in the ocfs2
xattr code.
- The 8 patch series "lib and lib/cmdline enhancements" from Dmitry
Antipov provides additional robustness checking in the cmdline handling
code and its in-kernel testing and selftests.
- The 18 patch series "cleanup the RAID6 P/Q library" from Christoph
Hellwig cleans up the RAID6 P/Q library to match the recent updates to
the RAID 5 XOR library and other CRC/crypto libraries.
- The 3 patch series "ocfs2: harden inode validators against forged
metadata" from Michael Bommarito adds three structural checks to OCFS2
dinode validation so malformed on-disk fields are rejected before
ocfs2_populate_inode() copies them into the in-core inode.
- The 2 patch series "lib/raid: replace __get_free_pages() call with
kmalloc()" from Mike Rapoport cleans up the lib/raid code by using
kmalloc() in more places.
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Merge tag 'mm-nonmm-stable-2026-06-21-10-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull non-MM updates from Andrew Morton:
- "taskstats: fix TGID dead-thread stat retention" (Yiyang Chen)
Fix a taskstats TGID aggregation bug where fields added in the TGID
query path were not preserved after thread exit, and adds a kselftest
covering the regression.
- "lib/tests: string_helpers: Slight improvements" (Andy Shevchenko)
Improve lib/tests/string_helpers_kunit.c a little
- "lib/base64: decode fixes" (Josh Law)
Address minor issues in lib/base64.c
- "selftests/filelock: Make output more kselftestish" (Mark Brown)
Make the output from the ofdlocks test a bit easier for tooling to
work with. Also ignore the generated file
- "uaccess: unify inline vs outline copy_{from,to}_user() selection"
(Yury Norov)
Simplify the usercopy code by removing the selectability of inlining
copy_{from,to}_user().
- "ocfs2: validate inline xattr header consumers" (ZhengYuan Huang)
Fix a number of possible issues in the ocfs2 xattr code
- "lib and lib/cmdline enhancements" (Dmitry Antipov)
Provide additional robustness checking in the cmdline handling code
and its in-kernel testing and selftests
- "cleanup the RAID6 P/Q library" (Christoph Hellwig)
Clean up the RAID6 P/Q library to match the recent updates to the
RAID 5 XOR library and other CRC/crypto libraries
- "ocfs2: harden inode validators against forged metadata" (Michael
Bommarito)
Add three structural checks to OCFS2 dinode validation so malformed
on-disk fields are rejected before ocfs2_populate_inode() copies them
into the in-core inode
- "lib/raid: replace __get_free_pages() call with kmalloc()" (Mike
Rapoport)
Clean up the lib/raid code by using kmalloc() in more places
* tag 'mm-nonmm-stable-2026-06-21-10-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (108 commits)
ocfs2: fix circular locking dependency in ocfs2_dio_end_io_write
ocfs2: fix NULL h_transaction deref in ocfs2_assure_trans_credits
lib: interval_tree_test: validate benchmark parameters
ocfs2: avoid moving extents to occupied clusters
treewide: fix transposed "sign" typos and update spelling.txt
ocfs2: fix UBSAN array-index-out-of-bounds in ocfs2_sum_rightmost_rec
fat: reject BPB volumes whose data area starts beyond total sectors
selftests/uevent: increase __UEVENT_BUFFER_SIZE to avoid ENOBUFS on busy systems
lib/test_firmware: allocate the configured into_buf size
fs: efs: remove unneeded debug prints
checkpatch: cuppress warnings when Reported-by: is followed by Link:
MAINTAINERS: add Alexander as a kcov reviewer
mailmap: update Alexander Sverdlin's Email addresses
fs: fat: inode: replace sprintf() with scnprintf()
ocfs2: fix out-of-bounds write in ocfs2_remove_refcount_extent
ocfs2: fix race between ocfs2_control_install_private() and ocfs2_control_release()
ocfs2/dlm: require a ref for locking_state debugfs open
ocfs2: reject FITRIM ranges shorter than a cluster
ocfs2: validate fast symlink target during inode read
ocfs2: add journal NULL check in ocfs2_checkpoint_inode()
...
|
||
|
Linus Torvalds
|
764e77d868 |
Locking updates for v7.2:
Futex updates:
- Optimize futex hash bucket access patterns (Peter Zijlstra)
- Large series to address the robust futex unlock race for real,
by Thomas Gleixner:
"The robust futex unlock mechanism is racy in respect
to the clearing of the robust_list_head::list_op_pending
pointer because unlock and clearing the pointer are not
atomic. The race window is between the unlock and clearing the
pending op pointer. If the task is forced to exit in this
window, exit will access a potentially invalid pending op
pointer when cleaning up the robust list. That happens if
another task manages to unmap the object containing the lock
before the cleanup, which results in an UAF. In the worst case
this UAF can lead to memory corruption when unrelated content
has been mapped to the same address by the time the access
happens.
User space can't solve this problem without help from the kernel.
This series provides the kernel side infrastructure to help it
along:
1) Combined unlock, pointer clearing, wake-up for the
contended case
2) VDSO based unlock and pointer clearing helpers with a
fix-up function in the kernel when user space was interrupted
within the critical section.
... with help by André Almeida:
- Add a note about robust list race condition (André Almeida)
- Add self-tests for robust release operations (André Almeida)
Context analysis updates:
- Implement context analysis for 'struct rt_mutex'.
(Bart Van Assche)
- Bump required Clang version to 23 (Marco Elver)
Guard infrastructure updates:
- Series to remove NULL check from unconditional guards
(Dmitry Ilvokhin)
Lockdep updates:
- Restore self-test migrate_disable() and sched_rt_mutex
state on PREEMPT_RT (Karl Mehltretter)
Membarriers updates:
- Use per-CPU mutexes for targeted commands (Aniket Gattani)
- Modernize membarrier_global_expedited with cleanup guards
(Aniket Gattani)
- Add rseq stress test for CFS throttle interactions (Aniket Gattani)
percpu-rwsems updates:
- Extract __percpu_up_read() to optimize inlining overhead
(Dmitry Ilvokhin)
Seqlocks updates:
- Allow UBSAN_ALIGNMENT to fail optimizing (Heiko Carstens)
Lock tracing:
- Add contended_release tracepoint to sleepable locks
such as mutexes, percpu-rwsems, rtmutexes, rwsems
and semaphores. (Dmitry Ilvokhin)
MAINTAINERS updates:
- MAINTAINERS: Add RUST [SYNC] entry (Boqun Feng)
Misc updates and fixes by Randy Dunlap, YE WEI-HONG,
Fabricio Parra, Dmitry Ilvokhin and Peter Zijlstra.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'locking-core-2026-06-14' of gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip
Pull locking updates from Ingo Molnar:
"Futex updates:
- Optimize futex hash bucket access patterns (Peter Zijlstra)
- Large series to address the robust futex unlock race for real, by
Thomas Gleixner:
"The robust futex unlock mechanism is racy in respect to the
clearing of the robust_list_head::list_op_pending pointer because
unlock and clearing the pointer are not atomic.
The race window is between the unlock and clearing the pending op
pointer. If the task is forced to exit in this window, exit will
access a potentially invalid pending op pointer when cleaning up
the robust list.
That happens if another task manages to unmap the object
containing the lock before the cleanup, which results in an UAF.
In the worst case this UAF can lead to memory corruption when
unrelated content has been mapped to the same address by the time
the access happens.
User space can't solve this problem without help from the kernel.
This series provides the kernel side infrastructure to help it
along:
1) Combined unlock, pointer clearing, wake-up for the
contended case
2) VDSO based unlock and pointer clearing helpers with a
fix-up function in the kernel when user space was interrupted
within the critical section.
... with help by André Almeida:
- Add a note about robust list race condition (André Almeida)
- Add self-tests for robust release operations (André Almeida)
Context analysis updates:
- Implement context analysis for 'struct rt_mutex'. (Bart Van Assche)
- Bump required Clang version to 23 (Marco Elver)
Guard infrastructure updates:
- Series to remove NULL check from unconditional guards (Dmitry
Ilvokhin)
Lockdep updates:
- Restore self-test migrate_disable() and sched_rt_mutex state on
PREEMPT_RT (Karl Mehltretter)
Membarriers updates:
- Use per-CPU mutexes for targeted commands (Aniket Gattani)
- Modernize membarrier_global_expedited with cleanup guards (Aniket
Gattani)
- Add rseq stress test for CFS throttle interactions (Aniket Gattani)
percpu-rwsems updates:
- Extract __percpu_up_read() to optimize inlining overhead (Dmitry
Ilvokhin)
Seqlocks updates:
- Allow UBSAN_ALIGNMENT to fail optimizing (Heiko Carstens)
Lock tracing:
- Add contended_release tracepoint to sleepable locks such as
mutexes, percpu-rwsems, rtmutexes, rwsems and semaphores (Dmitry
Ilvokhin)
MAINTAINERS updates:
- MAINTAINERS: Add RUST [SYNC] entry (Boqun Feng)
Misc updates and fixes by Randy Dunlap, YE WEI-HONG, Fabricio Parra,
Dmitry Ilvokhin and Peter Zijlstra"
* tag 'locking-core-2026-06-14' of gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip: (36 commits)
locking: Add contended_release tracepoint to sleepable locks
locking/percpu-rwsem: Extract __percpu_up_read()
tracing/lock: Remove unnecessary linux/sched.h include
futex: Optimize futex hash bucket access patterns
rust: sync: completion: Mark inline complete_all and wait_for_completion
MAINTAINERS: Add RUST [SYNC] entry
cleanup: Specify nonnull argument index
selftests: futex: Add tests for robust release operations
Documentation: futex: Add a note about robust list race condition
x86/vdso: Implement __vdso_futex_robust_try_unlock()
x86/vdso: Prepare for robust futex unlock support
futex: Provide infrastructure to plug the non contended robust futex unlock race
futex: Add robust futex unlock IP range
futex: Add support for unlocking robust futexes
futex: Cleanup UAPI defines
x86: Select ARCH_MEMORY_ORDER_TSO
uaccess: Provide unsafe_atomic_store_release_user()
futex: Provide UABI defines for robust list entry modifiers
futex: Move futex related mm_struct data into a struct
futex: Make futex_mm_init() void
...
|
||
|
Thomas Gleixner
|
c06cd66387 |
percpu: Sanitize __percpu_qual include hell
Slapping __percpu_qual into the next available header is sloppy at best. It's required by __percpu which is defined in compiler_types.h and that is meant to be included without requiring a boatload of other headers so that a struct or function declaration can contain a __percpu qualifier w/o further prerequisites. This implicit dependency on linux/percpu.h makes that impossible and causes a major problem when trying to separate headers. Create asm/percpu_types.h and move it there. Include that from compiler_types.h and the whole recursion problem goes away. Fix up UM so it uses the generic header and includes it in the UM_HOST build, which pulls in compiler_types.h. The USER_CFLAGS fix was suggested by Richard. Signed-off-by: Thomas Gleixner <tglx@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://patch.msgid.link/20260602090535.254874125@kernel.org |
||
|
Yury Norov
|
c02be2ad2b |
uaccess: unify inline vs outline copy_{from,to}_user() selection
The kernel allows arches to select between inline and outline
implementations of the copy_{from,to}_user() by defining individual
INLINE_COPY_FROM_USER and INLINE_COPY_TO_USER, correspondingly. However,
all arches enable or disable them always together.
Without the real use-case for one helper being inlined while the other
outlined, having independent controls is excessive and error prone.
Switch the codebase to the single unified INLINE_COPY_USER control.
Link: https://lore.kernel.org/20260425020857.356850-3-ynorov@nvidia.com
Signed-off-by: Yury Norov <ynorov@nvidia.com>
Tested-by: Alice Ryhl <aliceryhl@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Viktor Malik <vmalik@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
||
|
Masami Hiramatsu (Google)
|
a494d3c8d5 |
ring-buffer: Flush and stop persistent ring buffer on panic
On real hardware, panic and machine reboot may not flush hardware cache
to memory. This means the persistent ring buffer, which relies on a
coherent state of memory, may not have its events written to the buffer
and they may be lost. Moreover, there may be inconsistency with the
counters which are used for validation of the integrity of the
persistent ring buffer which may cause all data to be discarded.
To avoid this issue, stop recording of the ring buffer on panic and
flush the cache of the ring buffer's memory.
Fixes:
|
||
|
Linus Torvalds
|
065c4e67cc |
Mostly cleanups and small things, notably:
- musl libc compatibility - vDSO installation fix - TLB sync race fix for recent SMP support - build fix for 32-bit with Clang 20/21 -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEpeA8sTs3M8SN2hR410qiO8sPaAAFAmnmKS4ACgkQ10qiO8sP aAD2+w//dOOblgUYgQJUXIxHpS7Gcb3Tm+a7ujC23q/kWf/pc8milCSf+zoxzUXL 23Vwh4Gt4KrHKp8lG1gU3xZqV0qwhXNi5HO2hMpB0ioIVpX3TcrUhFbp/Oirvhgi 3PvnvsFtUlW82DFgewB98tefXZSAlG/pg+RjQ3weHfEo+xQbjYc+kR8o59tN8LNR Ea4rrxyjsr3KN2yBNaFpDkMchudP6XWgKByAZBxZ2FofC3zuVRCyF8ThDfQl/3/W muSqX+2iuKjGpmxV0XWt72hYOhNYjBtDY7f4EPe6sbUy+PU6SjD9h/s7VTyVHgZR 3Sii9AQLLJNYPoglExMfmWfeUnJCUJNNTLUze+ZtnhURZQYTvyJRzVmKj6fDPjK2 jGEKXanfZCK9Cfgy2f2xbQxCxhAVwz6QT0XaQO2dZBXa0anzG+2HM0Zn8MNa9jbU +Lm11k1jd1QBifr+5zeni98KHt2mf77blCny8TraODgLNgWUVi5kMkPF4bZgD4Qj udMU9lOkTD08R89hG/Le9TsB+NIpPauyNxDHUpC/VDterFdZqFvmOFT6afTo/4RZ nXNVdL1tn+7O7v0bLdbyhXwj2her1GDbe6HZ5eTNqmjcOthcgI3gF2stDfFhEbNb /wMHnpGPncMeEI8YWtWOFA4FA5T32+LafLCKhuRJdaw0+f/NMOo= =oovZ -----END PGP SIGNATURE----- Merge tag 'uml-for-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux Pull uml updates from Johannes Berg: "Mostly cleanups and small things, notably: - musl libc compatibility - vDSO installation fix - TLB sync race fix for recent SMP support - build fix for 32-bit with Clang 20/21" * tag 'uml-for-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux: um: Disable GCOV_PROFILE_ALL on 32-bit UML with Clang 20/21 um: drivers: call kernel_strrchr() explicitly in cow_user.c um: Replace strncpy() with strnlen()+memcpy_and_pad() in strncpy_chunk_from_user() x86/um: fix vDSO installation um: Remove CONFIG_FRAME_WARN from x86_64_defconfig um: Fix pte_read() and pte_exec() for kernel mappings um: Fix potential race condition in TLB sync um: time-travel: clean up kernel-doc warnings um: avoid struct sigcontext redefinition with musl um: fix address-of CMSG_DATA() rvalue in stub |
||
|
Linus Torvalds
|
440d6635b2 |
mm.git review status for linus..mm-nonmm-stable
Total patches: 126
Reviews/patch: 0.92
Reviewed rate: 76%
- The 2 patch series "pid: make sub-init creation retryable" from Oleg
Nesterov increases the robustness of our creation of init in a new
namespace. By clearing away some historical cruft which is no longer
needed. Also some documentation fixups are provided.
- The 2 patch series "selftests/fchmodat2: Error handling and general"
from Mark Brown has a fixup and a cleanup for the fchmodat2() syscall
selftest.
- The 3 patch series "lib: polynomial: Move to math/ and clean up" from
Andy Shevchenko does as advertised.
- The 3 patch series "hung_task: Provide runtime reset interface for
hung task detector" from Aaron Tomlin gives administrators the ability
to zero out /proc/sys/kernel/hung_task_detect_count.
- The 2 patch series "tools/getdelays: use the static UAPI headers from
tools/include/uapi" from Thomas Weißschuh teaches getdelays to use the
in-kernel UAPI headers rather than the system-provided ones.
- The 5 patch series "watchdog/hardlockup: Improvements to hardlockup"
from Mayank Rungta provides several cleanups and fixups to the
hardlockup detector code and its documentation.
- The 2 patch series "lib/bch: fix undefined behavior from signed
left-shifts" from Josh Law provides a couple of small/theoretical fixes
in the bch code.
- The 2 patch series "ocfs2/dlm: fix two bugs in dlm_match_regions()"
from Junrui Luo does what is claims.
- The 27 patch series "cleanup the RAID5 XOR library" from Christoph
Hellwig is a quite far-reaching cleanup to this code. I can't do better
than to quote Christoph:
The XOR library used for the RAID5 parity is a bit of a mess right
now. The main file sits in crypto/ despite not being cryptography and
not using the crypto API, with the generic implementations sitting in
include/asm-generic and the arch implementations sitting in an asm/
header in theory. The latter doesn't work for many cases, so
architectures often build the code directly into the core kernel, or
create another module for the architecture code.
Change this to a single module in lib/ that also contains the
architecture optimizations, similar to the library work Eric Biggers
has done for the CRC and crypto libraries later. After that it
changes to better calling conventions that allow for smarter
architecture implementations (although none is contained here yet),
and uses static_call to avoid indirection function call overhead.
- The 2 patch series "lib/list_sort: Clean up list_sort() scheduling
workarounds" from Kuan-Wei Chiu cleans up this library code by removing
a hacky thing which was added for UBIFS, which UBIFS doesn't actually
need.
- The 5 patch series "Fix bugs in extract_iter_to_sg()" from Christian
Ehrhardt fixes a few bugs in the scatterlist code, adds in-kernel tests
for the now-fixed bugs and fixes a leak in the test itself.
- The 3 patch series "kdump: Enable LUKS-encrypted dump target support
in ARM64 and PowerPC" from Coiby Xu eenables support of the
LUKS-encrypted device dump target on arm64 and powerpc.
- The 4 patch series "ocfs2: consolidate extent list validation into
block read callbacks" from Joseph Qi addresses ocfs2's validation of
extent list fields - cleanup, simplification, robustness. (Kernel test
robot loves mounting corrupted fs images!)
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Merge tag 'mm-nonmm-stable-2026-04-15-04-20' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull non-MM updates from Andrew Morton:
- "pid: make sub-init creation retryable" (Oleg Nesterov)
Make creation of init in a new namespace more robust by clearing away
some historical cruft which is no longer needed. Also some
documentation fixups
- "selftests/fchmodat2: Error handling and general" (Mark Brown)
Fix and a cleanup for the fchmodat2() syscall selftest
- "lib: polynomial: Move to math/ and clean up" (Andy Shevchenko)
- "hung_task: Provide runtime reset interface for hung task detector"
(Aaron Tomlin)
Give administrators the ability to zero out
/proc/sys/kernel/hung_task_detect_count
- "tools/getdelays: use the static UAPI headers from
tools/include/uapi" (Thomas Weißschuh)
Teach getdelays to use the in-kernel UAPI headers rather than the
system-provided ones
- "watchdog/hardlockup: Improvements to hardlockup" (Mayank Rungta)
Several cleanups and fixups to the hardlockup detector code and its
documentation
- "lib/bch: fix undefined behavior from signed left-shifts" (Josh Law)
A couple of small/theoretical fixes in the bch code
- "ocfs2/dlm: fix two bugs in dlm_match_regions()" (Junrui Luo)
- "cleanup the RAID5 XOR library" (Christoph Hellwig)
A quite far-reaching cleanup to this code. I can't do better than to
quote Christoph:
"The XOR library used for the RAID5 parity is a bit of a mess right
now. The main file sits in crypto/ despite not being cryptography
and not using the crypto API, with the generic implementations
sitting in include/asm-generic and the arch implementations
sitting in an asm/ header in theory. The latter doesn't work for
many cases, so architectures often build the code directly into
the core kernel, or create another module for the architecture
code.
Change this to a single module in lib/ that also contains the
architecture optimizations, similar to the library work Eric
Biggers has done for the CRC and crypto libraries later. After
that it changes to better calling conventions that allow for
smarter architecture implementations (although none is contained
here yet), and uses static_call to avoid indirection function call
overhead"
- "lib/list_sort: Clean up list_sort() scheduling workarounds"
(Kuan-Wei Chiu)
Clean up this library code by removing a hacky thing which was added
for UBIFS, which UBIFS doesn't actually need
- "Fix bugs in extract_iter_to_sg()" (Christian Ehrhardt)
Fix a few bugs in the scatterlist code, add in-kernel tests for the
now-fixed bugs and fix a leak in the test itself
- "kdump: Enable LUKS-encrypted dump target support in ARM64 and
PowerPC" (Coiby Xu)
Enable support of the LUKS-encrypted device dump target on arm64 and
powerpc
- "ocfs2: consolidate extent list validation into block read callbacks"
(Joseph Qi)
Cleanup, simplify, and make more robust ocfs2's validation of extent
list fields (Kernel test robot loves mounting corrupted fs images!)
* tag 'mm-nonmm-stable-2026-04-15-04-20' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (127 commits)
ocfs2: validate group add input before caching
ocfs2: validate bg_bits during freefrag scan
ocfs2: fix listxattr handling when the buffer is full
doc: watchdog: fix typos etc
update Sean's email address
ocfs2: use get_random_u32() where appropriate
ocfs2: split transactions in dio completion to avoid credit exhaustion
ocfs2: remove redundant l_next_free_rec check in __ocfs2_find_path()
ocfs2: validate extent block list fields during block read
ocfs2: remove empty extent list check in ocfs2_dx_dir_lookup_rec()
ocfs2: validate dx_root extent list fields during block read
ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY
ocfs2: handle invalid dinode in ocfs2_group_extend
.get_maintainer.ignore: add Askar
ocfs2: validate bg_list extent bounds in discontig groups
checkpatch: exclude forward declarations of const structs
tools/accounting: handle truncated taskstats netlink messages
taskstats: set version in TGID exit notifications
ocfs2/heartbeat: fix slot mapping rollback leaks on error paths
arm64,ppc64le/kdump: pass dm-crypt keys to kdump kernel
...
|
||
|
Mike Rapoport (Microsoft)
|
6215d9f447 |
arch, mm: consolidate empty_zero_page
Reduce 22 declarations of empty_zero_page to 3 and 23 declarations of ZERO_PAGE() to 4. Every architecture defines empty_zero_page that way or another, but for the most of them it is always a page aligned page in BSS and most definitions of ZERO_PAGE do virt_to_page(empty_zero_page). Move Linus vetted x86 definition of empty_zero_page and ZERO_PAGE() to the core MM and drop these definitions in architectures that do not implement colored zero page (MIPS and s390). ZERO_PAGE() remains a macro because turning it to a wrapper for a static inline causes severe pain in header dependencies. For the most part the change is mechanical, with these being noteworthy: * alpha: aliased empty_zero_page with ZERO_PGE that was also used for boot parameters. Switching to a generic empty_zero_page removes the aliasing and keeps ZERO_PGE for boot parameters only * arm64: uses __pa_symbol() in ZERO_PAGE() so that definition of ZERO_PAGE() is kept intact. * m68k/parisc/um: allocated empty_zero_page from memblock, although they do not support zero page coloring and having it in BSS will work fine. * sparc64 can have empty_zero_page in BSS rather allocate it, but it can't use virt_to_page() for BSS. Keep it's definition of ZERO_PAGE() but instead of allocating it, make mem_map_zero point to empty_zero_page. * sh: used empty_zero_page for boot parameters at the very early boot. Rename the parameters page to boot_params_page and let sh use the generic empty_zero_page. * hexagon: had an amusing comment about empty_zero_page /* A handy thing to have if one has the RAM. Declared in head.S */ that unfortunately had to go :) Link: https://lkml.kernel.org/r/20260211103141.3215197-4-rppt@kernel.org Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Acked-by: Helge Deller <deller@gmx.de> [parisc] Tested-by: Helge Deller <deller@gmx.de> [parisc] Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Magnus Lindholm <linmag7@gmail.com> [alpha] Acked-by: Dinh Nguyen <dinguyen@kernel.org> [nios2] Acked-by: Andreas Larsson <andreas@gaisler.com> [sparc] Acked-by: David Hildenbrand (Arm) <david@kernel.org> Acked-by: Liam R. Howlett <Liam.Howlett@oracle.com> Cc: "Borislav Petkov (AMD)" <bp@alien8.de> Cc: David S. Miller <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Guo Ren <guoren@kernel.org> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Hocko <mhocko@suse.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Richard Weinberger <richard@nod.at> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vineet Gupta <vgupta@kernel.org> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
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Christoph Hellwig
|
e20043b476 |
xor: make xor.ko self-contained in lib/raid/
Move the asm/xor.h headers to lib/raid/xor/$(SRCARCH)/xor_arch.h and include/linux/raid/xor_impl.h to lib/raid/xor/xor_impl.h so that the xor.ko module implementation is self-contained in lib/raid/. As this remove the asm-generic mechanism a new kconfig symbol is added to indicate that a architecture-specific implementations exists, and xor_arch.h should be included. Link: https://lkml.kernel.org/r/20260327061704.3707577-22-hch@lst.de Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Eric Biggers <ebiggers@kernel.org> Tested-by: Eric Biggers <ebiggers@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Alexandre Ghiti <alex@ghiti.fr> Cc: Andreas Larsson <andreas@gaisler.com> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Borislav Petkov (AMD)" <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Mason <clm@fb.com> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: David S. Miller <davem@davemloft.net> Cc: David Sterba <dsterba@suse.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jason A. Donenfeld <jason@zx2c4.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: Li Nan <linan122@huawei.com> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Magnus Lindholm <linmag7@gmail.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Richard Henderson <richard.henderson@linaro.org> Cc: Richard Weinberger <richard@nod.at> Cc: Russell King <linux@armlinux.org.uk> Cc: Song Liu <song@kernel.org> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Ted Ts'o <tytso@mit.edu> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: WANG Xuerui <kernel@xen0n.name> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
|
Christoph Hellwig
|
3ea16a9851 |
um/xor: cleanup xor.h
Since commit
|
||
|
Tiwei Bie
|
cd4126d48f |
um: Fix pte_read() and pte_exec() for kernel mappings
The pte_read() and pte_exec() helpers are only used during the TLB sync to determine the read/exec permissions for mmap. However, for kernel mappings, they will always return 0. This leads to kern_map() having to unconditionally set the exec flag to 1 and the read flag unexpectedly always being 0. Remove the unnecessary check for the _PAGE_USER bit in these helpers to ensure that the kernel mapping permissions can be correctly determined. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20260302235224.1915380-3-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
||
|
Linus Torvalds
|
4cff5c05e0 |
mm.git review status for linus..mm-stable
Everything:
Total patches: 325
Reviews/patch: 1.39
Reviewed rate: 72%
Excluding DAMON:
Total patches: 262
Reviews/patch: 1.63
Reviewed rate: 82%
Excluding DAMON and zram:
Total patches: 248
Reviews/patch: 1.72
Reviewed rate: 86%
- The 14 patch series "powerpc/64s: do not re-activate batched TLB
flush" from Alexander Gordeev makes arch_{enter|leave}_lazy_mmu_mode()
nest properly.
It adds a generic enter/leave layer and switches architectures to use
it. Various hacks were removed in the process.
- The 7 patch series "zram: introduce compressed data writeback" from
Richard Chang and Sergey Senozhatsky implements data compression for
zram writeback.
- The 8 patch series "mm: folio_zero_user: clear page ranges" from David
Hildenbrand adds clearing of contiguous page ranges for hugepages.
Large improvements during demand faulting are demonstrated.
- The 2 patch series "memcg cleanups" from Chen Ridong tideis up some
memcg code.
- The 12 patch series "mm/damon: introduce {,max_}nr_snapshots and
tracepoint for damos stats" from SeongJae Park improves DAMOS stat's
provided information, deterministic control, and readability.
- The 3 patch series "selftests/mm: hugetlb cgroup charging: robustness
fixes" from Li Wang fixes a few issues in the hugetlb cgroup charging
selftests.
- The 5 patch series "Fix va_high_addr_switch.sh test failure - again"
from Chunyu Hu addresses several issues in the va_high_addr_switch test.
- The 5 patch series "mm/damon/tests/core-kunit: extend existing test
scenarios" from Shu Anzai improves the KUnit test coverage for DAMON.
- The 2 patch series "mm/khugepaged: fix dirty page handling for
MADV_COLLAPSE" from Shivank Garg fixes a glitch in khugepaged which was
causing madvise(MADV_COLLAPSE) to transiently return -EAGAIN.
- The 29 patch series "arch, mm: consolidate hugetlb early reservation"
from Mike Rapoport reworks and consolidates a pile of straggly code
related to reservation of hugetlb memory from bootmem and creation of
CMA areas for hugetlb.
- The 9 patch series "mm: clean up anon_vma implementation" from Lorenzo
Stoakes cleans up the anon_vma implementation in various ways.
- The 3 patch series "tweaks for __alloc_pages_slowpath()" from
Vlastimil Babka does a little streamlining of the page allocator's
slowpath code.
- The 8 patch series "memcg: separate private and public ID namespaces"
from Shakeel Butt cleans up the memcg ID code and prevents the
internal-only private IDs from being exposed to userspace.
- The 6 patch series "mm: hugetlb: allocate frozen gigantic folio" from
Kefeng Wang cleans up the allocation of frozen folios and avoids some
atomic refcount operations.
- The 11 patch series "mm/damon: advance DAMOS-based LRU sorting" from
SeongJae Park improves DAMOS's movement of memory betewwn the active and
inactive LRUs and adds auto-tuning of the ratio-based quotas and of
monitoring intervals.
- The 18 patch series "Support page table check on PowerPC" from Andrew
Donnellan makes CONFIG_PAGE_TABLE_CHECK_ENFORCED work on powerpc.
- The 3 patch series "nodemask: align nodes_and{,not} with underlying
bitmap ops" from Yury Norov makes nodes_and() and nodes_andnot()
propagate the return values from the underlying bit operations, enabling
some cleanup in calling code.
- The 5 patch series "mm/damon: hide kdamond and kdamond_lock from API
callers" from SeongJae Park cleans up some DAMON internal interfaces.
- The 4 patch series "mm/khugepaged: cleanups and scan limit fix" from
Shivank Garg does some cleanup work in khupaged and fixes a scan limit
accounting issue.
- The 24 patch series "mm: balloon infrastructure cleanups" from David
Hildenbrand goes to town on the balloon infrastructure and its page
migration function. Mainly cleanups, also some locking simplification.
- The 2 patch series "mm/vmscan: add tracepoint and reason for
kswapd_failures reset" from Jiayuan Chen adds additional tracepoints to
the page reclaim code.
- The 3 patch series "Replace wq users and add WQ_PERCPU to
alloc_workqueue() users" from Marco Crivellari is part of Marco's
kernel-wide migration from the legacy workqueue APIs over to the
preferred unbound workqueues.
- The 9 patch series "Various mm kselftests improvements/fixes" from
Kevin Brodsky provides various unrelated improvements/fixes for the mm
kselftests.
- The 5 patch series "mm: accelerate gigantic folio allocation" from
Kefeng Wang greatly speeds up gigantic folio allocation, mainly by
avoiding unnecessary work in pfn_range_valid_contig().
- The 5 patch series "selftests/damon: improve leak detection and wss
estimation reliability" from SeongJae Park improves the reliability of
two of the DAMON selftests.
- The 8 patch series "mm/damon: cleanup kdamond, damon_call(), damos
filter and DAMON_MIN_REGION" from SeongJae Park does some cleanup work
in the core DAMON code.
- The 8 patch series "Docs/mm/damon: update intro, modules, maintainer
profile, and misc" from SeongJae Park performs maintenance work on the
DAMON documentation.
- The 10 patch series "mm: add and use vma_assert_stabilised() helper"
from Lorenzo Stoakes refactors and cleans up the core VMA code. The
main aim here is to be able to use the mmap write lock's lockdep state
to perform various assertions regarding the locking which the VMA code
requires.
- The 19 patch series "mm, swap: swap table phase II: unify swapin use"
from Kairui Song removes some old swap code (swap cache bypassing and
swap synchronization) which wasn't working very well. Various other
cleanups and simplifications were made. The end result is a 20% speedup
in one benchmark.
- The 8 patch series "enable PT_RECLAIM on more 64-bit architectures"
from Qi Zheng makes PT_RECLAIM available on 64-bit alpha, loongarch,
mips, parisc, um, Various cleanups were performed along the way.
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Merge tag 'mm-stable-2026-02-11-19-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull MM updates from Andrew Morton:
- "powerpc/64s: do not re-activate batched TLB flush" makes
arch_{enter|leave}_lazy_mmu_mode() nest properly (Alexander Gordeev)
It adds a generic enter/leave layer and switches architectures to use
it. Various hacks were removed in the process.
- "zram: introduce compressed data writeback" implements data
compression for zram writeback (Richard Chang and Sergey Senozhatsky)
- "mm: folio_zero_user: clear page ranges" adds clearing of contiguous
page ranges for hugepages. Large improvements during demand faulting
are demonstrated (David Hildenbrand)
- "memcg cleanups" tidies up some memcg code (Chen Ridong)
- "mm/damon: introduce {,max_}nr_snapshots and tracepoint for damos
stats" improves DAMOS stat's provided information, deterministic
control, and readability (SeongJae Park)
- "selftests/mm: hugetlb cgroup charging: robustness fixes" fixes a few
issues in the hugetlb cgroup charging selftests (Li Wang)
- "Fix va_high_addr_switch.sh test failure - again" addresses several
issues in the va_high_addr_switch test (Chunyu Hu)
- "mm/damon/tests/core-kunit: extend existing test scenarios" improves
the KUnit test coverage for DAMON (Shu Anzai)
- "mm/khugepaged: fix dirty page handling for MADV_COLLAPSE" fixes a
glitch in khugepaged which was causing madvise(MADV_COLLAPSE) to
transiently return -EAGAIN (Shivank Garg)
- "arch, mm: consolidate hugetlb early reservation" reworks and
consolidates a pile of straggly code related to reservation of
hugetlb memory from bootmem and creation of CMA areas for hugetlb
(Mike Rapoport)
- "mm: clean up anon_vma implementation" cleans up the anon_vma
implementation in various ways (Lorenzo Stoakes)
- "tweaks for __alloc_pages_slowpath()" does a little streamlining of
the page allocator's slowpath code (Vlastimil Babka)
- "memcg: separate private and public ID namespaces" cleans up the
memcg ID code and prevents the internal-only private IDs from being
exposed to userspace (Shakeel Butt)
- "mm: hugetlb: allocate frozen gigantic folio" cleans up the
allocation of frozen folios and avoids some atomic refcount
operations (Kefeng Wang)
- "mm/damon: advance DAMOS-based LRU sorting" improves DAMOS's movement
of memory betewwn the active and inactive LRUs and adds auto-tuning
of the ratio-based quotas and of monitoring intervals (SeongJae Park)
- "Support page table check on PowerPC" makes
CONFIG_PAGE_TABLE_CHECK_ENFORCED work on powerpc (Andrew Donnellan)
- "nodemask: align nodes_and{,not} with underlying bitmap ops" makes
nodes_and() and nodes_andnot() propagate the return values from the
underlying bit operations, enabling some cleanup in calling code
(Yury Norov)
- "mm/damon: hide kdamond and kdamond_lock from API callers" cleans up
some DAMON internal interfaces (SeongJae Park)
- "mm/khugepaged: cleanups and scan limit fix" does some cleanup work
in khupaged and fixes a scan limit accounting issue (Shivank Garg)
- "mm: balloon infrastructure cleanups" goes to town on the balloon
infrastructure and its page migration function. Mainly cleanups, also
some locking simplification (David Hildenbrand)
- "mm/vmscan: add tracepoint and reason for kswapd_failures reset" adds
additional tracepoints to the page reclaim code (Jiayuan Chen)
- "Replace wq users and add WQ_PERCPU to alloc_workqueue() users" is
part of Marco's kernel-wide migration from the legacy workqueue APIs
over to the preferred unbound workqueues (Marco Crivellari)
- "Various mm kselftests improvements/fixes" provides various unrelated
improvements/fixes for the mm kselftests (Kevin Brodsky)
- "mm: accelerate gigantic folio allocation" greatly speeds up gigantic
folio allocation, mainly by avoiding unnecessary work in
pfn_range_valid_contig() (Kefeng Wang)
- "selftests/damon: improve leak detection and wss estimation
reliability" improves the reliability of two of the DAMON selftests
(SeongJae Park)
- "mm/damon: cleanup kdamond, damon_call(), damos filter and
DAMON_MIN_REGION" does some cleanup work in the core DAMON code
(SeongJae Park)
- "Docs/mm/damon: update intro, modules, maintainer profile, and misc"
performs maintenance work on the DAMON documentation (SeongJae Park)
- "mm: add and use vma_assert_stabilised() helper" refactors and cleans
up the core VMA code. The main aim here is to be able to use the mmap
write lock's lockdep state to perform various assertions regarding
the locking which the VMA code requires (Lorenzo Stoakes)
- "mm, swap: swap table phase II: unify swapin use" removes some old
swap code (swap cache bypassing and swap synchronization) which
wasn't working very well. Various other cleanups and simplifications
were made. The end result is a 20% speedup in one benchmark (Kairui
Song)
- "enable PT_RECLAIM on more 64-bit architectures" makes PT_RECLAIM
available on 64-bit alpha, loongarch, mips, parisc, and um. Various
cleanups were performed along the way (Qi Zheng)
* tag 'mm-stable-2026-02-11-19-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (325 commits)
mm/memory: handle non-split locks correctly in zap_empty_pte_table()
mm: move pte table reclaim code to memory.c
mm: make PT_RECLAIM depends on MMU_GATHER_RCU_TABLE_FREE
mm: convert __HAVE_ARCH_TLB_REMOVE_TABLE to CONFIG_HAVE_ARCH_TLB_REMOVE_TABLE config
um: mm: enable MMU_GATHER_RCU_TABLE_FREE
parisc: mm: enable MMU_GATHER_RCU_TABLE_FREE
mips: mm: enable MMU_GATHER_RCU_TABLE_FREE
LoongArch: mm: enable MMU_GATHER_RCU_TABLE_FREE
alpha: mm: enable MMU_GATHER_RCU_TABLE_FREE
mm: change mm/pt_reclaim.c to use asm/tlb.h instead of asm-generic/tlb.h
mm/damon/stat: remove __read_mostly from memory_idle_ms_percentiles
zsmalloc: make common caches global
mm: add SPDX id lines to some mm source files
mm/zswap: use %pe to print error pointers
mm/vmscan: use %pe to print error pointers
mm/readahead: fix typo in comment
mm: khugepaged: fix NR_FILE_PAGES and NR_SHMEM in collapse_file()
mm: refactor vma_map_pages to use vm_insert_pages
mm/damon: unify address range representation with damon_addr_range
mm/cma: replace snprintf with strscpy in cma_new_area
...
|
||
|
David Hildenbrand
|
8e38607aa4 |
treewide: provide a generic clear_user_page() variant
Patch series "mm: folio_zero_user: clear page ranges", v11.
This series adds clearing of contiguous page ranges for hugepages.
The series improves on the current discontiguous clearing approach in two
ways:
- clear pages in a contiguous fashion.
- use batched clearing via clear_pages() wherever exposed.
The first is useful because it allows us to make much better use of
hardware prefetchers.
The second, enables advertising the real extent to the processor. Where
specific instructions support it (ex. string instructions on x86; "mops"
on arm64 etc), a processor can optimize based on this because, instead of
seeing a sequence of 8-byte stores, or a sequence of 4KB pages, it sees a
larger unit being operated on.
For instance, AMD Zen uarchs (for extents larger than LLC-size) switch to
a mode where they start eliding cacheline allocation. This is helpful not
just because it results in higher bandwidth, but also because now the
cache is not evicting useful cachelines and replacing them with zeroes.
Demand faulting a 64GB region shows performance improvement:
$ perf bench mem mmap -p $pg-sz -f demand -s 64GB -l 5
baseline +series
(GBps +- %stdev) (GBps +- %stdev)
pg-sz=2MB 11.76 +- 1.10% 25.34 +- 1.18% [*] +115.47% preempt=*
pg-sz=1GB 24.85 +- 2.41% 39.22 +- 2.32% + 57.82% preempt=none|voluntary
pg-sz=1GB (similar) 52.73 +- 0.20% [#] +112.19% preempt=full|lazy
[*] This improvement is because switching to sequential clearing
allows the hardware prefetchers to do a much better job.
[#] For pg-sz=1GB a large part of the improvement is because of the
cacheline elision mentioned above. preempt=full|lazy improves upon
that because, not needing explicit invocations of cond_resched() to
ensure reasonable preemption latency, it can clear the full extent
as a single unit. In comparison the maximum extent used for
preempt=none|voluntary is PROCESS_PAGES_NON_PREEMPT_BATCH (32MB).
When provided the full extent the processor forgoes allocating
cachelines on this path almost entirely.
(The hope is that eventually, in the fullness of time, the lazy
preemption model will be able to do the same job that none or
voluntary models are used for, allowing us to do away with
cond_resched().)
Raghavendra also tested previous version of the series on AMD Genoa and
sees similar improvement [1] with preempt=lazy.
$ perf bench mem map -p $page-size -f populate -s 64GB -l 10
base patched change
pg-sz=2MB 12.731939 GB/sec 26.304263 GB/sec 106.6%
pg-sz=1GB 26.232423 GB/sec 61.174836 GB/sec 133.2%
This patch (of 8):
Let's drop all variants that effectively map to clear_page() and provide
it in a generic variant instead.
We'll use the macro clear_user_page to indicate whether an architecture
provides it's own variant.
Also, clear_user_page() is only called from the generic variant of
clear_user_highpage(), so define it only if the architecture does not
provide a clear_user_highpage(). And, for simplicity define it in
linux/highmem.h.
Note that for parisc, clear_page() and clear_user_page() map to
clear_page_asm(), so we can just get rid of the custom clear_user_page()
implementation. There is a clear_user_page_asm() function on parisc, that
seems to be unused. Not sure what's up with that.
Link: https://lkml.kernel.org/r/20260107072009.1615991-1-ankur.a.arora@oracle.com
Link: https://lkml.kernel.org/r/20260107072009.1615991-2-ankur.a.arora@oracle.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Co-developed-by: Ankur Arora <ankur.a.arora@oracle.com>
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ankur Arora <ankur.a.arora@oracle.com>
Cc: "Borislav Petkov (AMD)" <bp@alien8.de>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Konrad Rzessutek Wilk <konrad.wilk@oracle.com>
Cc: Lance Yang <ioworker0@gmail.com>
Cc: "Liam R. Howlett" <Liam.Howlett@oracle.com>
Cc: Li Zhe <lizhe.67@bytedance.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Mateusz Guzik <mjguzik@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Raghavendra K T <raghavendra.kt@amd.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
||
|
Marco Elver
|
4f109baeea |
um: Fix incorrect __acquires/__releases annotations
With Clang's context analysis, the compiler is a bit more strict about
what goes into the __acquires/__releases annotations and can't refer to
non-existent variables.
On an UM build, mm_id.h is transitively included into mm_types.h, and we
can observe the following error (if context analysis is enabled in e.g.
stackdepot.c):
In file included from lib/stackdepot.c:17:
In file included from include/linux/debugfs.h:15:
In file included from include/linux/fs.h:5:
In file included from include/linux/fs/super.h:5:
In file included from include/linux/fs/super_types.h:7:
In file included from include/linux/list_lru.h:14:
In file included from include/linux/xarray.h:16:
In file included from include/linux/gfp.h:7:
In file included from include/linux/mmzone.h:22:
In file included from include/linux/mm_types.h:26:
In file included from arch/um/include/asm/mmu.h:12:
>> arch/um/include/shared/skas/mm_id.h:24:54: error: use of undeclared identifier 'turnstile'
24 | void enter_turnstile(struct mm_id *mm_id) __acquires(turnstile);
| ^~~~~~~~~
arch/um/include/shared/skas/mm_id.h:25:53: error: use of undeclared identifier 'turnstile'
25 | void exit_turnstile(struct mm_id *mm_id) __releases(turnstile);
| ^~~~~~~~~
One (discarded) option was to use token_context_lock(turnstile) to just
define a token with the already used name, but that would not allow the
compiler to distinguish between different mm_id-dependent instances.
Another constraint is that struct mm_id is only declared and incomplete
in the header, so even if we tried to construct an expression to get to
the mutex instance, this would fail (including more headers transitively
everywhere should also be avoided).
Instead, just declare an mm_id-dependent helper to return the mutex, and
use the mm_id-dependent call expression in the __acquires/__releases
attributes; the compiler will consider the identity of the mutex to be
the call expression. Then using __get_turnstile() in the lock/unlock
wrappers (with context analysis enabled for mmu.c) the compiler will be
able to verify the implementation of the wrappers as-is.
We leave context analysis disabled in arch/um/kernel/skas/ for now. This
change is a preparatory change to allow enabling context analysis in
subsystems that include any of the above headers.
No functional change intended.
Closes: https://lore.kernel.org/oe-kbuild-all/202512171220.vHlvhpCr-lkp@intel.com/
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251219154418.3592607-23-elver@google.com
|
||
|
Linus Torvalds
|
08b8ddac1f |
Address various objtool scalability bugs/inefficiencies exposed by
allmodconfig builds, plus improve the quality of alternatives instructions generated code and disassembly. Signed-off-by: Ingo Molnar <mingo@kernel.org> -----BEGIN PGP SIGNATURE----- iQJFBAABCgAvFiEEBpT5eoXrXCwVQwEKEnMQ0APhK1gFAmk0FVoRHG1pbmdvQGtl cm5lbC5vcmcACgkQEnMQ0APhK1iClg//dHY58dvrsp5Fzo10XgU99/kwzNEgl2b5 SMrSEbliTrehdpG4vBvig9tAMZurxOVIf6yDBEtV45XfD6w3tw6EFYpO1was9wTE R/80Ze6BAEeao782xN3sCpakU1Ogwbxhe4jYFZKE/WVbP9ZaeCI8qeBj3RAuOQ9y PCJzjD5fl9c2cAGDqCJEswxIptpP7eXoBo/V3Txf46M8/ffFcXdJbHN3HRBlszVs 5I9Wb2/vFmwJ4Yi4EO8H7KfzwaXA8wW/MJSDcM24P2/+o5iTqSLNd+rADFMW3XF2 /8b3uAy/6A6tT3ek1teNoM7qB9hRpM1pmpFwgjjTkjl8yamEp6P/W99qUN+UmfV+ NTiW9sz7ShhVTMCdALIljyjmji318crKYQBDulAHuEACpodcBg/GUGfuUcrjSRB/ C7PLatOpfMCODPRGPH4+8Wg8nnBGvOEjjODZBjAq2yU5aJnBeLPmbK2mtcaJtKi+ R0T2LIsNgmnEa4wRZbH8i4jXsgcbe6gD45Tx3qZpss7D4d9IyRWPO8v6GegFUpvh dw8qBqhgi1FzryZ/5uwh5IzkVq+iXHqkPBsV9w7CVSFF1Kc5w1/l7MXsEjkc7Xe3 qMjc43qsN0H/7ngoIA7yp4m7q87gqJMzReIfeIF4pGVtoULGQ+drN0jjQE/SHiKS /EM8IAAk0pU= =2DKc -----END PGP SIGNATURE----- Merge tag 'objtool-urgent-2025-12-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull objtool fixes from Ingo Molnar: "Address various objtool scalability bugs/inefficiencies exposed by allmodconfig builds, plus improve the quality of alternatives instructions generated code and disassembly" * tag 'objtool-urgent-2025-12-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: objtool: Simplify .annotate_insn code generation output some more objtool: Add more robust signal error handling, detect and warn about stack overflows objtool: Remove newlines and tabs from annotation macros objtool: Consolidate annotation macros x86/asm: Remove ANNOTATE_DATA_SPECIAL usage x86/alternative: Remove ANNOTATE_DATA_SPECIAL usage objtool: Fix stack overflow in validate_branch() |
||
|
Josh Poimboeuf
|
f387d0e102 |
x86/asm: Remove ANNOTATE_DATA_SPECIAL usage
Instead of manually annotating each __ex_table entry, just make the section mergeable and store the entry size in the ELF section header. Either way works for objtool create_fake_symbols(), this way produces cleaner code generation. Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://patch.msgid.link/b858cb7891c1ba0080e22a9c32595e6c302435e2.1764694625.git.jpoimboe@kernel.org |
||
|
Josh Poimboeuf
|
a818f28f01 |
x86/alternative: Remove ANNOTATE_DATA_SPECIAL usage
Instead of manually annotating each .altinstructions entry, just make the section mergeable and store the entry size in the ELF section header. Either way works for objtool create_fake_symbols(), this way produces cleaner code generation. Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://patch.msgid.link/5ac04e6db5be6453dce8003a771ebb0c47b4cd7a.1764694625.git.jpoimboe@kernel.org |
||
|
Christophe Leroy (CS GROUP)
|
a3209bb94b |
um: Disable KASAN_INLINE when STATIC_LINK is selected
um doesn't support KASAN_INLINE together with STATIC_LINK.
Instead of failing the build, disable KASAN_INLINE when
STATIC_LINK is selected.
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202511290451.x9GZVJ1l-lkp@intel.com/
Fixes:
|
||
|
Thomas Weißschuh
|
f20e32ffda |
um: Remove __access_ok_vsyscall()
FIXADDR_USER_START and FIXADDR_USER_END are now always zero. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Link: https://patch.msgid.link/20251028-uml-remove-32bit-pseudo-vdso-v1-8-e930063eff5f@weissschuh.net Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
||
|
Thomas Weißschuh
|
880f615bf9 |
um: Remove redundant range check from __access_ok_vsyscall()
The only caller __access_ok() is already doing the same check through __addr_range_nowrap(). Remove the redundant check. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Link: https://patch.msgid.link/20251028-uml-remove-32bit-pseudo-vdso-v1-7-e930063eff5f@weissschuh.net Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
||
|
Thomas Weißschuh
|
dbd7cf408a |
x86/um: Drop gate area handling
With the removal of the vDSO passthrough from the host, FIXADDR_USER_START is always 0 and the gate area setup code is dead. Remove it. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Link: https://patch.msgid.link/20251028-uml-remove-32bit-pseudo-vdso-v1-5-e930063eff5f@weissschuh.net Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
||
|
Thomas Weißschuh
|
8e03c195cc |
um: Avoid circular dependency on asm-offsets in pgtable.h
Recent changes have added an include of as-layout.h to pgtable.h.
However this introduces a circular dependency during asm-offsets
generation as as-layout.h depends on asm-offsets and pgtable.h is an
input for asm-offsets.
Building from a clean state results in the following error:
CC arch/um/kernel/asm-offsets.s
In file included from arch/um/include/asm/pgtable.h:48,
from include/linux/pgtable.h:6,
from include/linux/mm.h:31,
from include/linux/pid_namespace.h:7,
from include/linux/ptrace.h:10,
from include/linux/audit.h:13,
from arch/um/kernel/asm-offsets.c:8:
arch/um/include/shared/as-layout.h:9:10: fatal error: generated/asm-offsets.h: No such file or directory
9 | #include <generated/asm-offsets.h>
| ^~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make[4]: *** [scripts/Makefile.build:182: arch/um/kernel/asm-offsets.s] Error 1
As the inclusion of as-layout.h in pgtable.h is not yet needed while
asm-offsets are generated, break the dependency here.
Fixes:
|
||
|
Tiwei Bie
|
1e4ee5135d |
um: Add initial SMP support
Add initial symmetric multi-processing (SMP) support to UML. With this support enabled, users can tell UML to start multiple virtual processors, each represented as a separate host thread. In UML, kthreads and normal threads (when running in kernel mode) can be scheduled and executed simultaneously on different virtual processors. However, the userspace code of normal threads still runs within their respective single-threaded stubs. That is, SMP support is currently available both within the kernel and across different processes, but still remains limited within threads of the same process in userspace. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20251027001815.1666872-6-tiwei.bie@linux.dev Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
||
|
Tiwei Bie
|
9c82de55d4 |
um: Define timers on a per-CPU basis
Define timers on a per-CPU basis to enable each CPU to have its own timer. This is a preparation for adding SMP support. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20251027001815.1666872-5-tiwei.bie@linux.dev Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
||
|
Tiwei Bie
|
2670917c2f |
um: Determine sleep based on need_resched()
With SMP and NO_HZ enabled, the CPU may still need to sleep even if the timer is disarmed. Switch to deciding whether to sleep based on pending resched. Additionally, because disabling IRQs does not block SIGALRM, it is also necessary to check for any pending timer alarms. This is a preparation for adding SMP support. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20251027001815.1666872-4-tiwei.bie@linux.dev Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
||
|
Tiwei Bie
|
9e5a9f1c9b |
um: Turn signals_* into thread-local variables
Turn signals_enabled, signals_pending and signals_active into thread-local variables. This enables us to control and track signals independently on each CPU thread. This is a preparation for adding SMP support. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20251027001815.1666872-3-tiwei.bie@linux.dev Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
||
|
Tiwei Bie
|
a7f7dbae94 |
um: Remove file-based iomem emulation support
The file-based iomem emulation was introduced to support writing paravirtualized drivers based on emulated iomem regions. However, the only driver that makes use of it is an example driver called mmapper, which was written over two decades ago. We now have several modern device emulation mechanisms, such as vhost-user-based virtio-uml. Remove the file-based iomem emulation support to reduce the maintenance burden. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20251027054519.1996090-5-tiwei.bie@linux.dev Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
||
|
Tiwei Bie
|
9c84022c1d |
um: Replace UML_ROUND_UP() with PAGE_ALIGN()
Although UML_ROUND_UP() is defined in a shared header file, it depends on the PAGE_SIZE and PAGE_MASK macros, so it can only be used in kernel code. Considering its name is not very clear and its functionality is the same as PAGE_ALIGN(), replace its usages with a direct call to PAGE_ALIGN() and remove it. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20251027054519.1996090-4-tiwei.bie@linux.dev Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
||
|
Tiwei Bie
|
691ff59148 |
um: Make host_task_size a local variable
Currently, host_task_size is a global variable, but it is only used in linux_main() to compute stub_start and task_size. Make it a local variable to limit its scope to where it is actually needed. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20251027054519.1996090-2-tiwei.bie@linux.dev Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
||
|
Johannes Berg
|
6e3fc802ab |
um: move asm-offsets generation into a single file
There's nothing subarch dependent here, and it's odd that includes need to be done in the subarch, and then entries defined in the common file. Simplify the whole thing from three files into one. Link: https://patch.msgid.link/20251007071452.367989-4-johannes@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
||
|
Johannes Berg
|
f11839c16c |
um/hostfs: define HOSTFS_ATTR_* via asm-offsets
The HOSTFS_ATTR_* values were meant to be standalone for communication between hostfs's kernel and user code parts. However, it's easy to forget that HOSTFS_ATTR_* should be used even on the kernel side, and that wasn't consistently done. As a result, the values need to match ATTR_* values, which is not useful to maintain by hand. Instead, generate them via asm-offsets like other constants that UML needs in user-side code that aren't otherwise available in any header files that can be included there. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Reviewed-by: Hongbo Li <lihongbo22@huawei.com> Link: https://patch.msgid.link/20251007071452.367989-3-johannes@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
||
|
Linus Torvalds
|
fc282d1731 |
updates for UML, notably
- minor preparations for SMP support - SPARSE_IRQ support for kunit - help output cleanups -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEpeA8sTs3M8SN2hR410qiO8sPaAAFAmjjjKQACgkQ10qiO8sP aAA/Sw//SVjKUs6SVnaglxPQl/qRksULuakpejp2n6fdWL6EC25W6w1Zpl+iV0Yx asMYb6u9cZQxk8bBYXg3luXQF9YdE7MorcaOBQKNxJX5PZheekexTjvV2An0RcM8 t/g4hQXMFN7xv/k7KQ+DTw9l2jEKK21MltsOvB6VXWyBQ+cnvR66nVzzootH9vNR GELDhd/OFx8M9XMumTNLLHw4GsdLbtUKTFOxnjnBfJf4K0xa/O2wInE0/zrpnsZ4 M6Aj73nxeZ5peKIKmqgzxHcJiwjVx2jwqzwjE2EVmxlUNZjGZ9asTGMnmYHwd7YF 6Z+SrI6vQhBBC4SrDU2NEJxyNg876zjt+ua+D71IRjd0wQhms5nWJ1kDNmpQwWbh r6RkbddPlpPASQne30EXXZKwOsYQc2IT3Yf1GkOa+2RzNu0WIhQUkEfi8J+n8Jle ERPDdP9dKHuuPHmZ/CvjLm+PEIVkUKlq0R8+uiWFG8AbBjdyGlue5C4kixfhoZ6I yuiO/GMRotNaG6Nlr5rfpuWSNSWjY5kNpMFsfV+kVUWPCJavk/MXFFiIZfS4SI12 0GzIE7k1rwKo52EsV4gMnRtuvPioJ/mz335RfxT9ZOfaed9hw/Cl3d8aIw7WuNXz CFwHvSVe51fMaLJCLCiWKpBPcDioMymI72znWLqgHwqDvv9GJSM= =lpSi -----END PGP SIGNATURE----- Merge tag 'uml-for-linux-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux Pull uml updates from Johannes Berg: - minor preparations for SMP support - SPARSE_IRQ support for kunit - help output cleanups * tag 'uml-for-linux-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux: um: Remove unused ipi_pipe field from cpuinfo_um um: Remove unused cpu_data and current_cpu_data macros um: Stop tracking virtual CPUs via mm_cpumask() um: Centralize stub size calculations um: Remove outdated comment about STUB_DATA_PAGES um: Remove unused offset and child_err fields from stub_data um: Indent time-travel help messages um: Fix help message for ssl-non-raw um: vector: Fix indentation for help message um: Add missing trailing newline to help messages um: virtio-pci: implement .shutdown() um: Support SPARSE_IRQ |
||
|
Sabyrzhan Tasbolatov
|
1e338f4d99 |
kasan: introduce ARCH_DEFER_KASAN and unify static key across modes
Patch series "kasan: unify kasan_enabled() and remove arch-specific
implementations", v6.
This patch series addresses the fragmentation in KASAN initialization
across architectures by introducing a unified approach that eliminates
duplicate static keys and arch-specific kasan_arch_is_ready()
implementations.
The core issue is that different architectures have inconsistent approaches
to KASAN readiness tracking:
- PowerPC, LoongArch, and UML arch, each implement own kasan_arch_is_ready()
- Only HW_TAGS mode had a unified static key (kasan_flag_enabled)
- Generic and SW_TAGS modes relied on arch-specific solutions
or always-on behavior
This patch (of 2):
Introduce CONFIG_ARCH_DEFER_KASAN to identify architectures [1] that need
to defer KASAN initialization until shadow memory is properly set up, and
unify the static key infrastructure across all KASAN modes.
[1] PowerPC, UML, LoongArch selects ARCH_DEFER_KASAN.
The core issue is that different architectures haveinconsistent approaches
to KASAN readiness tracking:
- PowerPC, LoongArch, and UML arch, each implement own
kasan_arch_is_ready()
- Only HW_TAGS mode had a unified static key (kasan_flag_enabled)
- Generic and SW_TAGS modes relied on arch-specific solutions or always-on
behavior
This patch addresses the fragmentation in KASAN initialization across
architectures by introducing a unified approach that eliminates duplicate
static keys and arch-specific kasan_arch_is_ready() implementations.
Let's replace kasan_arch_is_ready() with existing kasan_enabled() check,
which examines the static key being enabled if arch selects
ARCH_DEFER_KASAN or has HW_TAGS mode support. For other arch,
kasan_enabled() checks the enablement during compile time.
Now KASAN users can use a single kasan_enabled() check everywhere.
Link: https://lkml.kernel.org/r/20250810125746.1105476-1-snovitoll@gmail.com
Link: https://lkml.kernel.org/r/20250810125746.1105476-2-snovitoll@gmail.com
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217049
Signed-off-by: Sabyrzhan Tasbolatov <snovitoll@gmail.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com> #powerpc
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Alexandre Ghiti <alexghiti@rivosinc.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: David Gow <davidgow@google.com>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Huacai Chen <chenhuacai@loongson.cn>
Cc: Marco Elver <elver@google.com>
Cc: Qing Zhang <zhangqing@loongson.cn>
Cc: Sabyrzhan Tasbolatov <snovitoll@gmail.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
||
|
Tiwei Bie
|
e66ae377fe |
um: Remove unused ipi_pipe field from cpuinfo_um
It's no longer used after the removal of the SMP implementation in
TT mode by commit
|
||
|
Tiwei Bie
|
be6a0372be |
um: Remove unused cpu_data and current_cpu_data macros
These two macros have no users. Remove them. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
||
|
Tiwei Bie
|
a73a9aad8a |
um: Stop tracking virtual CPUs via mm_cpumask()
In UML, each user address space is represented as a separate stub process on the host. Therefore, user address spaces do not require TLB management on UML virtual CPUs, and it's unnecessary to track which virtual CPUs they have executed on. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
||
|
Tiwei Bie
|
e047f9af9d |
um: Centralize stub size calculations
Currently, the stub size is calculated in multiple places. Define a macro that performs the calculation so that the code is easier to read and maintain. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
||
|
Tiwei Bie
|
b765d69a1a |
um: Remove outdated comment about STUB_DATA_PAGES
STUB_DATA_PAGES is no longer required to be a power of two since
commit
|
||
|
Tiwei Bie
|
78624eb99e |
um: Remove unused offset and child_err fields from stub_data
They are no longer used. Remove them. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
||
|
Linus Torvalds
|
beb6c8326e |
Mostly cleanups, except:
- dynamic addition of vfio passthrough devices - implementation of HAVE_SYSCALL_TRACEPOINTS -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEpeA8sTs3M8SN2hR410qiO8sPaAAFAmiIm+YACgkQ10qiO8sP aADNGw/8D+3rMvTcJyFPwZi3UAxyV/PQNFGe2UhPZf9SZlXKrzoku/+FaUtw66YG frmQb3tHbprJRdT1rb1bULtwRNpXifNf+LPcb4cjoci1z1qywZ5z5v8hfxYrjufr pw1f8Eev++EPDyQ6OdLMlZa5Sry0Cuf9xTC61ThCv95iUGVbGliPgMuA3LRf10Pd 99yZfzWv/K9MU53m+xtBNaO41Mn7B/ir6fam7Jrs2MpbeyJgB3bwETZs7ZI6P1sp +g+FtjQUdn5tFWBJ3Jpne0AH3dTU8cSN+QZ/1b1BzTVyyVDOvcXvDO5/XUAP51/Y TMeI3a1Y8LLzDHBluwHd3dwbmMMZjlvvvIXrexfuhA2bJWya9Jd1HSEh3l4CNIIB jnxNAHcswY6kClpCf3HTbdMZS5VqFZ1IUH1zcli62EtvpbCxVt82lgKuPBYs/p83 5vv59tr4n4ge6jm0P7WoyL75rsrY5y+XOtmbU1c3x5QzN6vCtGvVIqWdeZZMG2ge rXFUSdyRqmw4B3RvNGQ4jLhp6RZXUWDvamv/PfzU2vV1mz/wVo3nfGaX8olp5Fyq 7CxZegnO40wH1nj5JBP5zhh+AytSz0cbqPmZNfDYLA3lWnrJCANcmHRTkBxbN2+U PsBimJ5Y6xWZdaaxQjlrHkVHy8Iv8meDvwlJB55N3uY2lrGcndM= =WP21 -----END PGP SIGNATURE----- Merge tag 'uml-for-linux-6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux Pull uml updates from Johannes Berg: "Mostly cleanups, except: - dynamic addition of vfio passthrough devices - implementation of HAVE_SYSCALL_TRACEPOINTS" * tag 'uml-for-linux-6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux: um: Replace __ASSEMBLY__ with __ASSEMBLER__ in the usermode headers um: Stop tracking stub's PID via userspace_pid[] um: Remove the pid parameter of handle_trap() um: Use err consistently in userspace() um: vfio: Support adding devices via mconsole um: rtc: Avoid shadowing err in uml_rtc_start() um: Avoid redefining ARCH_HAS_CACHE_LINE_SIZE um: Make mm_list and mm_list_lock static um: Make unscheduled_userspace_iterations static um: Re-evaluate thread flags repeatedly um: simplify syscall header files um/ptrace: Implement HAVE_SYSCALL_TRACEPOINTS um/x86: Add system call table to header file um: virt-pci: Switch to msi_create_parent_irq_domain() um: virtio_pcidev: Rename UM_PCI_STAT_WAITING |
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|
Linus Torvalds
|
126e5754e9 |
This series massages asm/param.h to simpler and more uniform shape.
By the end of it,
* all arch/*/include/uapi/asm/param.h are either generated includes
of <asm-generic/param.h> or a #define or two followed by such include.
* no arch/*/include/asm/param.h anywhere, generated or not.
* include <asm/param.h> resolves to arch/*/include/uapi/asm/param.h
of the architecture in question (or that of host in case of uml).
* include/asm-generic/param.h pulls uapi/asm-generic/param.h and
deals with USER_HZ, CLOCKS_PER_SEC and with HZ redefinition after that.
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Merge tag 'pull-headers_param' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull asm/param cleanup from Al Viro:
"This massages asm/param.h to simpler and more uniform shape:
- all arch/*/include/uapi/asm/param.h are either generated includes
of <asm-generic/param.h> or a #define or two followed by such
include
- no arch/*/include/asm/param.h anywhere, generated or not
- include <asm/param.h> resolves to arch/*/include/uapi/asm/param.h
of the architecture in question (or that of host in case of uml)
- include/asm-generic/param.h pulls uapi/asm-generic/param.h and
deals with USER_HZ, CLOCKS_PER_SEC and with HZ redefinition after
that"
* tag 'pull-headers_param' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
loongarch, um, xtensa: get rid of generated arch/$ARCH/include/asm/param.h
alpha: regularize the situation with asm/param.h
xtensa: get rid uapi/asm/param.h
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Thomas Huth
|
fc9ed2f658 |
um: Replace __ASSEMBLY__ with __ASSEMBLER__ in the usermode headers
While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembly code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This can be very confusing when switching between userspace and kernelspace coding, so let's standardize on the __ASSEMBLER__ macro that is provided by the compilers now. This is a completely mechanical patch (done with a simple "sed -i" statement). Cc: Richard Weinberger <richard@nod.at> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: linux-um@lists.infradead.org Signed-off-by: Thomas Huth <thuth@redhat.com> Link: https://patch.msgid.link/20250314071013.1575167-36-thuth@redhat.com Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
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|
Tiwei Bie
|
f7e9077a16 |
um: Stop tracking stub's PID via userspace_pid[]
The PID of the stub process can be obtained from current_mm_id(). There is no need to track it via userspace_pid[]. Stop doing that to simplify the code. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20250711065021.2535362-4-tiwei.bie@linux.dev Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
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|
Thomas Weißschuh
|
b9e2f2246e |
um: Re-evaluate thread flags repeatedly
The thread flags may change during their processing. For example a task_work can queue a new signal to be sent. This signal should be delivered before returning to usespace again. Evaluate the flags repeatedly similar to other architectures. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Reviewed-by: Nam Cao <namcao@linutronix.de> Link: https://patch.msgid.link/20250704-uml-thread_flags-v1-1-0e293fd8d627@linutronix.de Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
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Thomas Weißschuh
|
2a713f04ed |
um/ptrace: Implement HAVE_SYSCALL_TRACEPOINTS
Implement syscall tracepoints through the generic tracing infrastructure. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Reviewed-by: Nam Cao <namcao@linutronix.de> Link: https://patch.msgid.link/20250703-uml-have_syscall_tracepoints-v1-2-23c1d3808578@linutronix.de Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
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|
Al Viro
|
2560014ec1 |
loongarch, um, xtensa: get rid of generated arch/$ARCH/include/asm/param.h
For loongarch and xtensa that gets them to do what x86 et.al. are doing - have asm/param.h resolve to uapi variant, which is generated by mandatory-y += param.h and contains exact same include. On um it will resolve to x86 uapi variant instead, which also contains the same include (um doesn't have uapi headers, but it does build the host ones). Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> |
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Magnus Lindholm
|
403d1338a4 |
mm: pgtable: fix pte_swp_exclusive
Make pte_swp_exclusive return bool instead of int. This will better reflect how pte_swp_exclusive is actually used in the code. This fixes swap/swapoff problems on Alpha due pte_swp_exclusive not returning correct values when _PAGE_SWP_EXCLUSIVE bit resides in upper 32-bits of PTE (like on alpha). Suggested-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Magnus Lindholm <linmag7@gmail.com> Cc: Sam James <sam@gentoo.org> Link: https://lore.kernel.org/lkml/20250218175735.19882-2-linmag7@gmail.com/ Link: https://lore.kernel.org/lkml/20250602041118.GA2675383@ZenIV/ [ Applied as the 'sed' script Al suggested - Linus ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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|
Linus Torvalds
|
cfc4ca8986 |
Notable changes:
- remove obsolete network transports
- remove PCI IO port support
- start adding seccomp-based process handling
instead of ptrace
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Merge tag 'uml-for-linux-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux
Pull UML updates from Johannes Berg:
"The only really new thing is the long-standing seccomp work
(originally from 2021!). Wven if it still isn't enabled by default due
to security concerns it can still be used e.g. for tests.
- remove obsolete network transports
- remove PCI IO port support
- start adding seccomp-based process handling instead of ptrace"
* tag 'uml-for-linux-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux: (29 commits)
um: remove "extern" from implementation of sigchld_handler
um: fix unused variable warning
um: fix SECCOMP 32bit xstate register restore
um: pass FD for memory operations when needed
um: Add SECCOMP support detection and initialization
um: Implement kernel side of SECCOMP based process handling
um: Track userspace children dying in SECCOMP mode
um: Add helper functions to get/set state for SECCOMP
um: Add stub side of SECCOMP/futex based process handling
um: Move faultinfo extraction into userspace routine
um: vector: Use mac_pton() for MAC address parsing
um: vector: Clean up and modernize log messages
um: chan_kern: use raw spinlock for irqs_to_free_lock
MAINTAINERS: remove obsolete file entry in TUN/TAP DRIVER
um: Fix tgkill compile error on old host OSes
um: stop using PCI port I/O
um: Remove legacy network transport infrastructure
um: vector: Eliminate the dependency on uml_net
um: Remove obsolete legacy network transports
um/asm: Replace "REP; NOP" with PAUSE mnemonic
...
|
||
|
Benjamin Berg
|
e92e255285 |
um: pass FD for memory operations when needed
Instead of always sharing the FDs with the userspace process, only hand over the FDs needed for mmap when required. The idea is that userspace might be able to force the stub into executing an mmap syscall, however, it will not be able to manipulate the control flow sufficiently to have access to an FD that would allow mapping arbitrary memory. Security wise, we need to be sure that only the expected syscalls are executed after the kernel sends FDs through the socket. This is currently not the case, as userspace can trivially jump to the rt_sigreturn syscall instruction to execute any syscall that the stub is permitted to do. With this, it can trick the kernel to send the FD, which in turn allows userspace to freely map any physical memory. As such, this is currently *not* secure. However, in principle the approach should be fine with a more strict SECCOMP filter and a careful review of the stub control flow (as userspace can prepare a stack). With some care, it is likely possible to extend the security model to SMP if desired. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20250602130052.545733-8-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com> |
||
|
Benjamin Berg
|
406d17c6c3 |
um: Implement kernel side of SECCOMP based process handling
This adds the kernel side of the seccomp based process handling. Co-authored-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Benjamin Berg <benjamin@sipsolutions.net> Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20250602130052.545733-6-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com> |