un-inlining which results in a section mismatch.
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Merge tag 'locking-urgent-2021-07-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 jump label fix from Thomas Gleixner:
"A single fix for jump labels to prevent the compiler from agressive
un-inlining which results in a section mismatch"
* tag 'locking-urgent-2021-07-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
jump_labels: Mark __jump_label_transform() as __always_inlined to work around aggressive compiler un-inlining
- Prevent memblock and I/O reserved resources to get out of sync when EFI
memreserve is in use.
- Don't claim a non-existing table is invalid
- Don't warn when firmware memory is already reserved correctly
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Merge tag 'efi-urgent-2021-07-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull EFI fixes from Thomas Gleixner:
"A set of EFI fixes:
- Prevent memblock and I/O reserved resources to get out of sync when
EFI memreserve is in use.
- Don't claim a non-existing table is invalid
- Don't warn when firmware memory is already reserved correctly"
* tag 'efi-urgent-2021-07-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
efi/mokvar: Reserve the table only if it is in boot services data
efi/libstub: Fix the efi_load_initrd function description
firmware/efi: Tell memblock about EFI iomem reservations
efi/tpm: Differentiate missing and invalid final event log table.
causes a section mismatch.
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Merge tag 'core-urgent-2021-07-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull core fix from Thomas Gleixner:
"A single update for the boot code to prevent aggressive un-inlining
which causes a section mismatch"
* tag 'core-urgent-2021-07-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
smpboot: Mark idle_init() as __always_inlined to work around aggressive compiler un-inlining
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Merge tag '5.14-rc2-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6
Pull cifs fixes from Steve French:
"Five cifs/smb3 fixes, including a DFS failover fix, two fallocate
fixes, and two trivial coverity cleanups"
* tag '5.14-rc2-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
cifs: fix fallocate when trying to allocate a hole.
CIFS: Clarify SMB1 code for POSIX delete file
CIFS: Clarify SMB1 code for POSIX Create
cifs: support share failover when remounting
cifs: only write 64kb at a time when fallocating a small region of a file
* A fix to properly set the memory size, which fixes 32-bit systems.
* A fix to allow the initrd to load anywhere in memory, rather that
restricting it to the first 256MiB.
* A fix for the mem= parameter on 64-bit systems, to properly account
for the maximum supported memory now that the kernel is outside the
linear map.
* A fix to avoid installing mappings into the last 4KiB of memory, which
conflicts with error values.
* A fix to avoid the stack from being freed while it is being walked.
* A handful of fixes to the new copy to/from user routines.
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Merge tag 'riscv-for-linus-5.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux
Pull RISC-V fixes from Palmer Dabbelt:
- properly set the memory size, which fixes 32-bit systems
- allow initrd to load anywhere in memory, rather that restricting it
to the first 256MiB
- fix the 'mem=' parameter on 64-bit systems to properly account for
the maximum supported memory now that the kernel is outside the
linear map
- avoid installing mappings into the last 4KiB of memory, which
conflicts with error values
- avoid the stack from being freed while it is being walked
- a handful of fixes to the new copy to/from user routines
* tag 'riscv-for-linus-5.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
riscv: __asm_copy_to-from_user: Fix: Typos in comments
riscv: __asm_copy_to-from_user: Remove unnecessary size check
riscv: __asm_copy_to-from_user: Fix: fail on RV32
riscv: __asm_copy_to-from_user: Fix: overrun copy
riscv: stacktrace: pin the task's stack in get_wchan
riscv: Make sure the kernel mapping does not overlap with IS_ERR_VALUE
riscv: Make sure the linear mapping does not use the kernel mapping
riscv: Fix memory_limit for 64-bit kernel
RISC-V: load initrd wherever it fits into memory
riscv: Fix 32-bit RISC-V boot failure
Commit 71f6428332 ("ACPI: utils: Fix reference counting in
for_each_acpi_dev_match()") started doing "acpi_dev_put()" on a pointer
that was possibly NULL. That fails miserably, because that helper
inline function is not set up to handle that case.
Just make acpi_dev_put() silently accept a NULL pointer, rather than
calling down to put_device() with an invalid offset off that NULL
pointer.
Link: https://lore.kernel.org/lkml/a607c149-6bf6-0fd0-0e31-100378504da2@kernel.dk/
Reported-and-tested-by: Jens Axboe <axboe@kernel.dk>
Tested-by: Daniel Scally <djrscally@gmail.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Four fixes, all in drivers, all of which can lead to user visible
problems in certain situations.
Signed-off-by: James E.J. Bottomley <jejb@linux.ibm.com>
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Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Pull SCSI fixes from James Bottomley:
"Four fixes, all in drivers, all of which can lead to user visible
problems in certain situations"
* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
scsi: target: Fix NULL dereference on XCOPY completion
scsi: mpt3sas: Transition IOC to Ready state during shutdown
scsi: target: Fix protect handling in WRITE SAME(32)
scsi: iscsi: Fix iface sysfs attr detection
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Merge tag 'block-5.14-2021-07-24' of git://git.kernel.dk/linux-block
Pull block fixes from Jens Axboe:
- NVMe pull request (Christoph):
- tracing fix (Keith Busch)
- fix multipath head refcounting (Hannes Reinecke)
- Write Zeroes vs PI fix (me)
- drop a bogus WARN_ON (Zhihao Cheng)
- Increase max blk-cgroup policy size, now that mq-deadline
uses it too (Oleksandr)
* tag 'block-5.14-2021-07-24' of git://git.kernel.dk/linux-block:
nvme: set the PRACT bit when using Write Zeroes with T10 PI
nvme: fix nvme_setup_command metadata trace event
nvme: fix refcounting imbalance when all paths are down
nvme-pci: don't WARN_ON in nvme_reset_work if ctrl.state is not RESETTING
block: increase BLKCG_MAX_POLS
Pull i2c fixes from Wolfram Sang:
"Two bugfixes for the I2C subsystem"
* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
i2c: mpc: Poll for MCF
misc: eeprom: at24: Always append device id even if label property is set.
Merge misc mm fixes from Andrew Morton:
"15 patches.
VM subsystems affected by this patch series: userfaultfd, kfence,
highmem, pagealloc, memblock, pagecache, secretmem, pagemap, and
hugetlbfs"
* akpm:
hugetlbfs: fix mount mode command line processing
mm: fix the deadlock in finish_fault()
mm: mmap_lock: fix disabling preemption directly
mm/secretmem: wire up ->set_page_dirty
writeback, cgroup: do not reparent dax inodes
writeback, cgroup: remove wb from offline list before releasing refcnt
memblock: make for_each_mem_range() traverse MEMBLOCK_HOTPLUG regions
mm: page_alloc: fix page_poison=1 / INIT_ON_ALLOC_DEFAULT_ON interaction
mm: use kmap_local_page in memzero_page
mm: call flush_dcache_page() in memcpy_to_page() and memzero_page()
kfence: skip all GFP_ZONEMASK allocations
kfence: move the size check to the beginning of __kfence_alloc()
kfence: defer kfence_test_init to ensure that kunit debugfs is created
selftest: use mmap instead of posix_memalign to allocate memory
userfaultfd: do not untag user pointers
Clean up:
The size of 0 will be evaluated in the next step. Not
required here.
Signed-off-by: Akira Tsukamoto <akira.tsukamoto@gmail.com>
Fixes: ca6eaaa210 ("riscv: __asm_copy_to-from_user: Optimize unaligned memory access and pipeline stall")
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Had a bug when converting bytes to bits when the cpu was rv32.
The a3 contains the number of bytes and multiple of 8
would be the bits. The LGREG is holding 2 for RV32 and 3 for
RV32, so to achieve multiple of 8 it must always be constant 3.
The 2 was mistakenly used for rv32.
Signed-off-by: Akira Tsukamoto <akira.tsukamoto@gmail.com>
Fixes: ca6eaaa210 ("riscv: __asm_copy_to-from_user: Optimize unaligned memory access and pipeline stall")
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
There were two causes for the overrun memory access.
The threshold size was too small.
The aligning dst require one SZREG and unrolling word copy requires
8*SZREG, total have to be at least 9*SZREG.
Inside the unrolling copy, the subtracting -(8*SZREG-1) would make
iteration happening one extra loop. Proper value is -(8*SZREG).
Signed-off-by: Akira Tsukamoto <akira.tsukamoto@gmail.com>
Fixes: ca6eaaa210 ("riscv: __asm_copy_to-from_user: Optimize unaligned memory access and pipeline stall")
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
In commit 32021982a3 ("hugetlbfs: Convert to fs_context") processing
of the mount mode string was changed from match_octal() to fsparam_u32.
This changed existing behavior as match_octal does not require octal
values to have a '0' prefix, but fsparam_u32 does.
Use fsparam_u32oct which provides the same behavior as match_octal.
Link: https://lkml.kernel.org/r/20210721183326.102716-1-mike.kravetz@oracle.com
Fixes: 32021982a3 ("hugetlbfs: Convert to fs_context")
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Reported-by: Dennis Camera <bugs+kernel.org@dtnr.ch>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Commit 63f3655f95 ("mm, memcg: fix reclaim deadlock with writeback")
fix the following ABBA deadlock by pre-allocating the pte page table
without holding the page lock.
lock_page(A)
SetPageWriteback(A)
unlock_page(A)
lock_page(B)
lock_page(B)
pte_alloc_one
shrink_page_list
wait_on_page_writeback(A)
SetPageWriteback(B)
unlock_page(B)
# flush A, B to clear the writeback
Commit f9ce0be71d ("mm: Cleanup faultaround and finish_fault()
codepaths") reworked the relevant code but ignored this race. This will
cause the deadlock above to appear again, so fix it.
Link: https://lkml.kernel.org/r/20210721074849.57004-1-zhengqi.arch@bytedance.com
Fixes: f9ce0be71d ("mm: Cleanup faultaround and finish_fault() codepaths")
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Commit 832b507253 ("mm: mmap_lock: use local locks instead of
disabling preemption") fixed a bug by using local locks.
But commit d01079f3d0 ("mm/mmap_lock: remove dead code for
!CONFIG_TRACING configurations") changed those lines back to the
original version.
I guess it was introduced by fixing conflicts.
Link: https://lkml.kernel.org/r/20210720074228.76342-1-songmuchun@bytedance.com
Fixes: d01079f3d0 ("mm/mmap_lock: remove dead code for !CONFIG_TRACING configurations")
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta@ionos.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Make secretmem up to date with the changes done in commit 0af573780b
("mm: require ->set_page_dirty to be explicitly wired up") so that
unconditional call to this method won't cause crashes.
Link: https://lkml.kernel.org/r/20210716063933.31633-1-rppt@kernel.org
Fixes: 0af573780b ("mm: require ->set_page_dirty to be explicitly wired up")
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Commit b10d6bca87 ("arch, drivers: replace for_each_membock() with
for_each_mem_range()") didn't take into account that when there is
movable_node parameter in the kernel command line, for_each_mem_range()
would skip ranges marked with MEMBLOCK_HOTPLUG.
The page table setup code in POWER uses for_each_mem_range() to create
the linear mapping of the physical memory and since the regions marked
as MEMORY_HOTPLUG are skipped, they never make it to the linear map.
A later access to the memory in those ranges will fail:
BUG: Unable to handle kernel data access on write at 0xc000000400000000
Faulting instruction address: 0xc00000000008a3c0
Oops: Kernel access of bad area, sig: 11 [#1]
LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries
Modules linked in:
CPU: 0 PID: 53 Comm: kworker/u2:0 Not tainted 5.13.0 #7
NIP: c00000000008a3c0 LR: c0000000003c1ed8 CTR: 0000000000000040
REGS: c000000008a57770 TRAP: 0300 Not tainted (5.13.0)
MSR: 8000000002009033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 84222202 XER: 20040000
CFAR: c0000000003c1ed4 DAR: c000000400000000 DSISR: 42000000 IRQMASK: 0
GPR00: c0000000003c1ed8 c000000008a57a10 c0000000019da700 c000000400000000
GPR04: 0000000000000280 0000000000000180 0000000000000400 0000000000000200
GPR08: 0000000000000100 0000000000000080 0000000000000040 0000000000000300
GPR12: 0000000000000380 c000000001bc0000 c0000000001660c8 c000000006337e00
GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR20: 0000000040000000 0000000020000000 c000000001a81990 c000000008c30000
GPR24: c000000008c20000 c000000001a81998 000fffffffff0000 c000000001a819a0
GPR28: c000000001a81908 c00c000001000000 c000000008c40000 c000000008a64680
NIP clear_user_page+0x50/0x80
LR __handle_mm_fault+0xc88/0x1910
Call Trace:
__handle_mm_fault+0xc44/0x1910 (unreliable)
handle_mm_fault+0x130/0x2a0
__get_user_pages+0x248/0x610
__get_user_pages_remote+0x12c/0x3e0
get_arg_page+0x54/0xf0
copy_string_kernel+0x11c/0x210
kernel_execve+0x16c/0x220
call_usermodehelper_exec_async+0x1b0/0x2f0
ret_from_kernel_thread+0x5c/0x70
Instruction dump:
79280fa4 79271764 79261f24 794ae8e2 7ca94214 7d683a14 7c893a14 7d893050
7d4903a6 60000000 60000000 60000000 <7c001fec> 7c091fec 7c081fec 7c051fec
---[ end trace 490b8c67e6075e09 ]---
Making for_each_mem_range() include MEMBLOCK_HOTPLUG regions in the
traversal fixes this issue.
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1976100
Link: https://lkml.kernel.org/r/20210712071132.20902-1-rppt@kernel.org
Fixes: b10d6bca87 ("arch, drivers: replace for_each_membock() with for_each_mem_range()")
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Tested-by: Greg Kurz <groug@kaod.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: <stable@vger.kernel.org> [5.10+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The commit message introducing the global memzero_page explicitly
mentions switching to kmap_local_page in the commit log but doesn't
actually do that.
Link: https://lkml.kernel.org/r/20210713055231.137602-3-hch@lst.de
Fixes: 28961998f8 ("iov_iter: lift memzero_page() to highmem.h")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
memcpy_to_page and memzero_page can write to arbitrary pages, which
could be in the page cache or in high memory, so call
flush_kernel_dcache_pages to flush the dcache.
This is a problem when using these helpers on dcache challeneged
architectures. Right now there are just a few users, chances are no one
used the PC floppy driver, the aha1542 driver for an ISA SCSI HBA, and a
few advanced and optional btrfs and ext4 features on those platforms yet
since the conversion.
Link: https://lkml.kernel.org/r/20210713055231.137602-2-hch@lst.de
Fixes: bb90d4bc7b ("mm/highmem: Lift memcpy_[to|from]_page to core")
Fixes: 28961998f8 ("iov_iter: lift memzero_page() to highmem.h")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Cc: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Allocation requests outside ZONE_NORMAL (MOVABLE, HIGHMEM or DMA) cannot
be fulfilled by KFENCE, because KFENCE memory pool is located in a zone
different from the requested one.
Because callers of kmem_cache_alloc() may actually rely on the
allocation to reside in the requested zone (e.g. memory allocations
done with __GFP_DMA must be DMAable), skip all allocations done with
GFP_ZONEMASK and/or respective SLAB flags (SLAB_CACHE_DMA and
SLAB_CACHE_DMA32).
Link: https://lkml.kernel.org/r/20210714092222.1890268-2-glider@google.com
Fixes: 0ce20dd840 ("mm: add Kernel Electric-Fence infrastructure")
Signed-off-by: Alexander Potapenko <glider@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Acked-by: Souptick Joarder <jrdr.linux@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Souptick Joarder <jrdr.linux@gmail.com>
Cc: <stable@vger.kernel.org> [5.12+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Check the allocation size before toggling kfence_allocation_gate.
This way allocations that can't be served by KFENCE will not result in
waiting for another CONFIG_KFENCE_SAMPLE_INTERVAL without allocating
anything.
Link: https://lkml.kernel.org/r/20210714092222.1890268-1-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Suggested-by: Marco Elver <elver@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: <stable@vger.kernel.org> [5.12+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kfence_test_init and kunit_init both use the same level late_initcall,
which means if kfence_test_init linked ahead of kunit_init,
kfence_test_init will get a NULL debugfs_rootdir as parent dentry, then
kfence_test_init and kfence_debugfs_init both create a debugfs node
named "kfence" under debugfs_mount->mnt_root, and it will throw out
"debugfs: Directory 'kfence' with parent '/' already present!" with
EEXIST. So kfence_test_init should be deferred.
Link: https://lkml.kernel.org/r/20210714113140.2949995-1-o451686892@gmail.com
Signed-off-by: Weizhao Ouyang <o451686892@gmail.com>
Tested-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This test passes pointers obtained from anon_allocate_area to the
userfaultfd and mremap APIs. This causes a problem if the system
allocator returns tagged pointers because with the tagged address ABI
the kernel rejects tagged addresses passed to these APIs, which would
end up causing the test to fail. To make this test compatible with such
system allocators, stop using the system allocator to allocate memory in
anon_allocate_area, and instead just use mmap.
Link: https://lkml.kernel.org/r/20210714195437.118982-3-pcc@google.com
Link: https://linux-review.googlesource.com/id/Icac91064fcd923f77a83e8e133f8631c5b8fc241
Fixes: c47174fc36 ("userfaultfd: selftest")
Co-developed-by: Lokesh Gidra <lokeshgidra@google.com>
Signed-off-by: Lokesh Gidra <lokeshgidra@google.com>
Signed-off-by: Peter Collingbourne <pcc@google.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Dave Martin <Dave.Martin@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Alistair Delva <adelva@google.com>
Cc: William McVicker <willmcvicker@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Mitch Phillips <mitchp@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: <stable@vger.kernel.org> [5.4]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Patch series "userfaultfd: do not untag user pointers", v5.
If a user program uses userfaultfd on ranges of heap memory, it may end
up passing a tagged pointer to the kernel in the range.start field of
the UFFDIO_REGISTER ioctl. This can happen when using an MTE-capable
allocator, or on Android if using the Tagged Pointers feature for MTE
readiness [1].
When a fault subsequently occurs, the tag is stripped from the fault
address returned to the application in the fault.address field of struct
uffd_msg. However, from the application's perspective, the tagged
address *is* the memory address, so if the application is unaware of
memory tags, it may get confused by receiving an address that is, from
its point of view, outside of the bounds of the allocation. We observed
this behavior in the kselftest for userfaultfd [2] but other
applications could have the same problem.
Address this by not untagging pointers passed to the userfaultfd ioctls.
Instead, let the system call fail. Also change the kselftest to use
mmap so that it doesn't encounter this problem.
[1] https://source.android.com/devices/tech/debug/tagged-pointers
[2] tools/testing/selftests/vm/userfaultfd.c
This patch (of 2):
Do not untag pointers passed to the userfaultfd ioctls. Instead, let
the system call fail. This will provide an early indication of problems
with tag-unaware userspace code instead of letting the code get confused
later, and is consistent with how we decided to handle brk/mmap/mremap
in commit dcde237319 ("mm: Avoid creating virtual address aliases in
brk()/mmap()/mremap()"), as well as being consistent with the existing
tagged address ABI documentation relating to how ioctl arguments are
handled.
The code change is a revert of commit 7d0325749a ("userfaultfd: untag
user pointers") plus some fixups to some additional calls to
validate_range that have appeared since then.
[1] https://source.android.com/devices/tech/debug/tagged-pointers
[2] tools/testing/selftests/vm/userfaultfd.c
Link: https://lkml.kernel.org/r/20210714195437.118982-1-pcc@google.com
Link: https://lkml.kernel.org/r/20210714195437.118982-2-pcc@google.com
Link: https://linux-review.googlesource.com/id/I761aa9f0344454c482b83fcfcce547db0a25501b
Fixes: 63f0c60379 ("arm64: Introduce prctl() options to control the tagged user addresses ABI")
Signed-off-by: Peter Collingbourne <pcc@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Alistair Delva <adelva@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Dave Martin <Dave.Martin@arm.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Mitch Phillips <mitchp@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: William McVicker <willmcvicker@google.com>
Cc: <stable@vger.kernel.org> [5.4]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Catch an illegal case to queue async from an unrelated task that got
the ring fd passed to it. This should not be possible to hit, but
better be proactive and catch it explicitly. io-wq is extended to
check for early IO_WQ_WORK_CANCEL being set on a work item as well,
so it can run the request through the normal cancelation path.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
There are two reasons why this shouldn't be done:
1) Ring is exiting, and we're canceling requests anyway. Any request
should be canceled anyway. In theory, this could iterate for a
number of times if someone else is also driving the target block
queue into request starvation, however the likelihood of this
happening is miniscule.
2) If the original task decided to pass the ring to another task, then
we don't want to be reissuing from this context as it may be an
unrelated task or context. No assumptions should be made about
the context in which ->release() is run. This can only happen for pure
read/write, and we'll get -EFAULT on them anyway.
Link: https://lore.kernel.org/io-uring/YPr4OaHv0iv0KTOc@zeniv-ca.linux.org.uk/
Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Merge tag 'for-5.14-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs fixes from David Sterba:
"A few fixes and one patch to help some block layer API cleanups:
- skip missing device when running fstrim
- fix unpersisted i_size on fsync after expanding truncate
- fix lock inversion problem when doing qgroup extent tracing
- replace bdgrab/bdput usage, replace gendisk by block_device"
* tag 'for-5.14-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
btrfs: store a block_device in struct btrfs_ordered_extent
btrfs: fix lock inversion problem when doing qgroup extent tracing
btrfs: check for missing device in btrfs_trim_fs
btrfs: fix unpersisted i_size on fsync after expanding truncate
(marked for stable). Also included a rare WARN condition tweak.
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Merge tag 'ceph-for-5.14-rc3' of git://github.com/ceph/ceph-client
Pull ceph fixes from Ilya Dryomov:
"A subtle deadlock on lock_rwsem (marked for stable) and rbd fixes for
a -rc1 regression.
Also included a rare WARN condition tweak"
* tag 'ceph-for-5.14-rc3' of git://github.com/ceph/ceph-client:
rbd: resurrect setting of disk->private_data in rbd_init_disk()
ceph: don't WARN if we're still opening a session to an MDS
rbd: don't hold lock_rwsem while running_list is being drained
rbd: always kick acquire on "acquired" and "released" notifications
- Fix deadloop in ring buffer because of using stale "read" variable
- Fix synthetic event use of field_pos as boolean and not an index
- Fixed histogram special var "cpu" overriding event fields called "cpu"
- Cleaned up error prone logic in alloc_synth_event()
- Removed call to synchronize_rcu_tasks_rude() when not needed
- Removed redundant initialization of a local variable "ret"
- Fixed kernel crash when updating tracepoint callbacks of different
priorities.
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Merge tag 'trace-v5.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing fixes from Steven Rostedt:
- Fix deadloop in ring buffer because of using stale "read" variable
- Fix synthetic event use of field_pos as boolean and not an index
- Fixed histogram special var "cpu" overriding event fields called
"cpu"
- Cleaned up error prone logic in alloc_synth_event()
- Removed call to synchronize_rcu_tasks_rude() when not needed
- Removed redundant initialization of a local variable "ret"
- Fixed kernel crash when updating tracepoint callbacks of different
priorities.
* tag 'trace-v5.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
tracepoints: Update static_call before tp_funcs when adding a tracepoint
ftrace: Remove redundant initialization of variable ret
ftrace: Avoid synchronize_rcu_tasks_rude() call when not necessary
tracing: Clean up alloc_synth_event()
tracing/histogram: Rename "cpu" to "common_cpu"
tracing: Synthetic event field_pos is an index not a boolean
tracing: Fix bug in rb_per_cpu_empty() that might cause deadloop.
- Fix a Mac defconfig regression due to the IDE -> ATA switch.
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Merge tag 'm68k-for-v5.14-tag2' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k
Pull m68k fix from Geert Uytterhoeven:
- Fix a Mac defconfig regression due to the IDE -> ATA switch
* tag 'm68k-for-v5.14-tag2' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k:
m68k: MAC should select HAVE_PATA_PLATFORM
Here are 2 small driver core fixes to resolve some reported problems for
5.14-rc3. They include:
- aux bus memory leak fix
- unneeded warning message removed when removing a device link.
Both have been in linux-next with no reported problems.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-5.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core fixes from Greg KH:
"Here are two small driver core fixes to resolve some reported problems
for 5.14-rc3. They include:
- aux bus memory leak fix
- unneeded warning message removed when removing a device link.
Both have been in linux-next with no reported problems"
* tag 'driver-core-5.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
driver core: Prevent warning when removing a device link from unregistered consumer
driver core: auxiliary bus: Fix memory leak when driver_register() fail
Here are some small char/misc driver fixes for 5.14-rc3.
Included in here are:
- MAINTAINERS file updates for 2 changes in different driver
subsystems.
- mhi bus bugfixes
- nds32 bugfix that resolves a reported problem.
All have been in linux-next with no reported problems.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'char-misc-5.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc fixes from Greg KH:
"Here are some small char/misc driver fixes for 5.14-rc3.
Included in here are:
- MAINTAINERS file updates for two changes in different driver
subsystems
- mhi bus bugfixes
- nds32 bugfix that resolves a reported problem
All have been in linux-next with no reported problems"
* tag 'char-misc-5.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
nds32: fix up stack guard gap
MAINTAINERS: Change ACRN HSM driver maintainer
MAINTAINERS: Update for VMCI driver
bus: mhi: pci_generic: Fix inbound IPCR channel
bus: mhi: core: Validate channel ID when processing command completions
bus: mhi: pci_generic: Apply no-op for wake using sideband wake boolean
Here are some USB fixes for 5.14-rc3 to resolve a bunch of tiny problems
reported. Included in here are:
- dtsi revert to resolve a problem which broke android systems
that relied on the dts name to find the USB controller device.
People are still working out the "real" solution for this, but
for now the revert is needed.
- core USB fix for pipe calculation found by syzbot
- typec fixes
- gadget driver fixes
- new usb-serial device ids
- new USB quirks
- xhci fixes
- usb hub fixes for power management issues reported
- other tiny fixes
All have been in linux-next with no reported problems.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'usb-5.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Pull USB fixes from Greg KH:
"Here are some USB fixes for 5.14-rc3 to resolve a bunch of tiny
problems reported. Included in here are:
- dtsi revert to resolve a problem which broke android systems that
relied on the dts name to find the USB controller device.
People are still working out the "real" solution for this, but for
now the revert is needed.
- core USB fix for pipe calculation found by syzbot
- typec fixes
- gadget driver fixes
- new usb-serial device ids
- new USB quirks
- xhci fixes
- usb hub fixes for power management issues reported
- other tiny fixes
All have been in linux-next with no reported problems"
* tag 'usb-5.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (27 commits)
USB: serial: cp210x: add ID for CEL EM3588 USB ZigBee stick
Revert "USB: quirks: ignore remote wake-up on Fibocom L850-GL LTE modem"
usb: cdc-wdm: fix build error when CONFIG_WWAN_CORE is not set
Revert "arm64: dts: qcom: Harmonize DWC USB3 DT nodes name"
usb: dwc2: gadget: Fix sending zero length packet in DDMA mode.
usb: dwc2: Skip clock gating on Samsung SoCs
usb: renesas_usbhs: Fix superfluous irqs happen after usb_pkt_pop()
usb: dwc2: gadget: Fix GOUTNAK flow for Slave mode.
usb: phy: Fix page fault from usb_phy_uevent
usb: xhci: avoid renesas_usb_fw.mem when it's unusable
usb: gadget: u_serial: remove WARN_ON on null port
usb: dwc3: avoid NULL access of usb_gadget_driver
usb: max-3421: Prevent corruption of freed memory
usb: gadget: Fix Unbalanced pm_runtime_enable in tegra_xudc_probe
MAINTAINERS: repair reference in USB IP DRIVER FOR HISILICON KIRIN 970
usb: typec: stusb160x: Don't block probing of consumer of "connector" nodes
usb: typec: stusb160x: register role switch before interrupt registration
USB: usb-storage: Add LaCie Rugged USB3-FW to IGNORE_UAS
usb: ehci: Prevent missed ehci interrupts with edge-triggered MSI
usb: hub: Disable USB 3 device initiated lpm if exit latency is too high
...
A collection of small fixes, mostly covering device-specific
regressions and bugs over ASoC, HD-audio and USB-audio, while the
ALSA PCM core received a few additional fixes for the possible
(new and old) regressions.
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Merge tag 'sound-5.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai:
"A collection of small fixes, mostly covering device-specific
regressions and bugs over ASoC, HD-audio and USB-audio, while
the ALSA PCM core received a few additional fixes for the
possible (new and old) regressions"
* tag 'sound-5.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (29 commits)
ALSA: usb-audio: Add registration quirk for JBL Quantum headsets
ALSA: hda/hdmi: Add quirk to force pin connectivity on NUC10
ALSA: pcm: Fix mmap without buffer preallocation
ALSA: pcm: Fix mmap capability check
ALSA: hda: intel-dsp-cfg: add missing ElkhartLake PCI ID
ASoC: ti: j721e-evm: Check for not initialized parent_clk_id
ASoC: ti: j721e-evm: Fix unbalanced domain activity tracking during startup
ALSA: hda/realtek: Fix pop noise and 2 Front Mic issues on a machine
ALSA: hdmi: Expose all pins on MSI MS-7C94 board
ALSA: sb: Fix potential ABBA deadlock in CSP driver
ASoC: rt5682: Fix the issue of garbled recording after powerd_dbus_suspend
ASoC: amd: reverse stop sequence for stoneyridge platform
ASoC: soc-pcm: add a flag to reverse the stop sequence
ASoC: codecs: wcd938x: setup irq during component bind
ASoC: dt-bindings: renesas: rsnd: Fix incorrect 'port' regex schema
ALSA: usb-audio: Add missing proc text entry for BESPOKEN type
ASoC: codecs: wcd938x: make sdw dependency explicit in Kconfig
ASoC: SOF: Intel: Update ADL descriptor to use ACPI power states
ASoC: rt5631: Fix regcache sync errors on resume
ALSA: pcm: Call substream ack() method upon compat mmap commit
...
Because of the significant overhead that retpolines pose on indirect
calls, the tracepoint code was updated to use the new "static_calls" that
can modify the running code to directly call a function instead of using
an indirect caller, and this function can be changed at runtime.
In the tracepoint code that calls all the registered callbacks that are
attached to a tracepoint, the following is done:
it_func_ptr = rcu_dereference_raw((&__tracepoint_##name)->funcs);
if (it_func_ptr) {
__data = (it_func_ptr)->data;
static_call(tp_func_##name)(__data, args);
}
If there's just a single callback, the static_call is updated to just call
that callback directly. Once another handler is added, then the static
caller is updated to call the iterator, that simply loops over all the
funcs in the array and calls each of the callbacks like the old method
using indirect calling.
The issue was discovered with a race between updating the funcs array and
updating the static_call. The funcs array was updated first and then the
static_call was updated. This is not an issue as long as the first element
in the old array is the same as the first element in the new array. But
that assumption is incorrect, because callbacks also have a priority
field, and if there's a callback added that has a higher priority than the
callback on the old array, then it will become the first callback in the
new array. This means that it is possible to call the old callback with
the new callback data element, which can cause a kernel panic.
static_call = callback1()
funcs[] = {callback1,data1};
callback2 has higher priority than callback1
CPU 1 CPU 2
----- -----
new_funcs = {callback2,data2},
{callback1,data1}
rcu_assign_pointer(tp->funcs, new_funcs);
/*
* Now tp->funcs has the new array
* but the static_call still calls callback1
*/
it_func_ptr = tp->funcs [ new_funcs ]
data = it_func_ptr->data [ data2 ]
static_call(callback1, data);
/* Now callback1 is called with
* callback2's data */
[ KERNEL PANIC ]
update_static_call(iterator);
To prevent this from happening, always switch the static_call to the
iterator before assigning the tp->funcs to the new array. The iterator will
always properly match the callback with its data.
To trigger this bug:
In one terminal:
while :; do hackbench 50; done
In another terminal
echo 1 > /sys/kernel/tracing/events/sched/sched_waking/enable
while :; do
echo 1 > /sys/kernel/tracing/set_event_pid;
sleep 0.5
echo 0 > /sys/kernel/tracing/set_event_pid;
sleep 0.5
done
And it doesn't take long to crash. This is because the set_event_pid adds
a callback to the sched_waking tracepoint with a high priority, which will
be called before the sched_waking trace event callback is called.
Note, the removal to a single callback updates the array first, before
changing the static_call to single callback, which is the proper order as
the first element in the array is the same as what the static_call is
being changed to.
Link: https://lore.kernel.org/io-uring/4ebea8f0-58c9-e571-fd30-0ce4f6f09c70@samba.org/
Cc: stable@vger.kernel.org
Fixes: d25e37d89d ("tracepoint: Optimize using static_call()")
Reported-by: Stefan Metzmacher <metze@samba.org>
tested-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
The variable ret is being initialized with a value that is never
read, it is being updated later on. The assignment is redundant and
can be removed.
Link: https://lkml.kernel.org/r/20210721120915.122278-1-colin.king@canonical.com
Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
synchronize_rcu_tasks_rude() triggers IPIs and forces rescheduling on
all CPUs. It is a costly operation and, when targeting nohz_full CPUs,
very disrupting (hence the name). So avoid calling it when 'old_hash'
doesn't need to be freed.
Link: https://lkml.kernel.org/r/20210721114726.1545103-1-nsaenzju@redhat.com
Signed-off-by: Nicolas Saenz Julienne <nsaenzju@redhat.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
alloc_synth_event() currently has the following code to initialize the
event fields and dynamic_fields:
for (i = 0, j = 0; i < n_fields; i++) {
event->fields[i] = fields[i];
if (fields[i]->is_dynamic) {
event->dynamic_fields[j] = fields[i];
event->dynamic_fields[j]->field_pos = i;
event->dynamic_fields[j++] = fields[i];
event->n_dynamic_fields++;
}
}
1) It would make more sense to have all fields keep track of their
field_pos.
2) event->dynmaic_fields[j] is assigned twice for no reason.
3) We can move updating event->n_dynamic_fields outside the loop, and just
assign it to j.
This combination makes the code much cleaner.
Link: https://lkml.kernel.org/r/20210721195341.29bb0f77@oasis.local.home
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Currently the histogram logic allows the user to write "cpu" in as an
event field, and it will record the CPU that the event happened on.
The problem with this is that there's a lot of events that have "cpu"
as a real field, and using "cpu" as the CPU it ran on, makes it
impossible to run histograms on the "cpu" field of events.
For example, if I want to have a histogram on the count of the
workqueue_queue_work event on its cpu field, running:
># echo 'hist:keys=cpu' > events/workqueue/workqueue_queue_work/trigger
Gives a misleading and wrong result.
Change the command to "common_cpu" as no event should have "common_*"
fields as that's a reserved name for fields used by all events. And
this makes sense here as common_cpu would be a field used by all events.
Now we can even do:
># echo 'hist:keys=common_cpu,cpu if cpu < 100' > events/workqueue/workqueue_queue_work/trigger
># cat events/workqueue/workqueue_queue_work/hist
# event histogram
#
# trigger info: hist:keys=common_cpu,cpu:vals=hitcount:sort=hitcount:size=2048 if cpu < 100 [active]
#
{ common_cpu: 0, cpu: 2 } hitcount: 1
{ common_cpu: 0, cpu: 4 } hitcount: 1
{ common_cpu: 7, cpu: 7 } hitcount: 1
{ common_cpu: 0, cpu: 7 } hitcount: 1
{ common_cpu: 0, cpu: 1 } hitcount: 1
{ common_cpu: 0, cpu: 6 } hitcount: 2
{ common_cpu: 0, cpu: 5 } hitcount: 2
{ common_cpu: 1, cpu: 1 } hitcount: 4
{ common_cpu: 6, cpu: 6 } hitcount: 4
{ common_cpu: 5, cpu: 5 } hitcount: 14
{ common_cpu: 4, cpu: 4 } hitcount: 26
{ common_cpu: 0, cpu: 0 } hitcount: 39
{ common_cpu: 2, cpu: 2 } hitcount: 184
Now for backward compatibility, I added a trick. If "cpu" is used, and
the field is not found, it will fall back to "common_cpu" and work as
it did before. This way, it will still work for old programs that use
"cpu" to get the actual CPU, but if the event has a "cpu" as a field, it
will get that event's "cpu" field, which is probably what it wants
anyway.
I updated the tracefs/README to include documentation about both the
common_timestamp and the common_cpu. This way, if that text is present in
the README, then an application can know that common_cpu is supported over
just plain "cpu".
Link: https://lkml.kernel.org/r/20210721110053.26b4f641@oasis.local.home
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: stable@vger.kernel.org
Fixes: 8b7622bf94 ("tracing: Add cpu field for hist triggers")
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
