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Ralph Campbell c18ce674d5 mm/hmm: hmm_range_fault() infinite loop 
Normally, callers to handle_mm_fault() are supposed to check the
vma->vm_flags first. hmm_range_fault() checks for VM_READ but doesn't
check for VM_WRITE if the caller requests a page to be faulted in with
write permission (via the hmm_range.pfns[] value).  If the vma is write
protected, this can result in an infinite loop:

  hmm_range_fault()
    walk_page_range()
      ...
      hmm_vma_walk_hole()
        hmm_vma_walk_hole_()
          hmm_vma_do_fault()
            handle_mm_fault(FAULT_FLAG_WRITE)
            /* returns VM_FAULT_WRITE */
          /* returns -EBUSY */
        /* returns -EBUSY */
      /* returns -EBUSY */
    /* loops on -EBUSY and range->valid */

Prevent this by checking for vma->vm_flags & VM_WRITE before calling
handle_mm_fault().

Link: https://lore.kernel.org/r/20190823221753.2514-3-rcampbell@nvidia.com
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2019-08-27 19:27:07 -03:00
..
kasan
mm/kasan: change kasan_check_{read,write} to return boolean
2019-07-12 11:05:42 -07:00
backing-dev.c
backing-dev: no need to check return value of debugfs_create functions
2019-06-03 15:49:07 +02:00
balloon_compaction.c
balloon: fix up comments
2019-07-22 11:19:26 -04:00
cleancache.c
Driver Core and debugfs changes for 5.3-rc1
2019-07-12 12:24:03 -07:00
cma_debug.c
mm/cma_debug.c: fix the break condition in cma_maxchunk_get()
2019-05-14 09:47:45 -07:00
cma.c
mm/cma.c: fail if fixed declaration can't be honored
2019-07-16 19:23:21 -07:00
cma.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
compaction.c
mm: compaction: avoid 100% CPU usage during compaction when a task is killed
2019-08-03 07:02:00 -07:00
debug_page_ref.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
debug.c
mm: update references to page _refcount
2019-05-14 19:52:47 -07:00
dmapool.c
mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options
2019-07-12 11:05:46 -07:00
early_ioremap.c
mm/early_ioremap: Fix boot hang with earlyprintk=efi,keep
2017-12-11 14:54:44 +01:00
fadvise.c
vfs: implement readahead(2) using POSIX_FADV_WILLNEED
2018-08-30 20:01:32 +02:00
failslab.c
mm/failslab.c: by default, do not fail allocations with direct reclaim only
2019-07-12 11:05:43 -07:00
filemap.c
mm/filemap.c: correct the comment about VM_FAULT_RETRY
2019-07-12 11:05:43 -07:00
frame_vector.c
mm/frame_vector.c: release a semaphore in 'get_vaddr_frames()'
2017-12-14 16:00:48 -08:00
frontswap.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 482
2019-06-19 17:09:52 +02:00
gup_benchmark.c
mm/gup: replace get_user_pages_longterm() with FOLL_LONGTERM
2019-05-14 09:47:45 -07:00
gup.c
mm: introduce ARCH_HAS_PTE_DEVMAP
2019-07-16 19:23:25 -07:00
highmem.c
mm: convert totalram_pages and totalhigh_pages variables to atomic
2018-12-28 12:11:47 -08:00
hmm.c
mm/hmm: hmm_range_fault() infinite loop
2019-08-27 19:27:07 -03:00
huge_memory.c
Revert "mm, thp: restore node-local hugepage allocations"
2019-08-13 16:06:52 -07:00
hugetlb_cgroup.c
mm: rename page_counter's count/limit into usage/max
2018-06-07 17:34:35 -07:00
hugetlb.c
hugetlbfs: fix hugetlb page migration/fault race causing SIGBUS
2019-08-13 16:06:53 -07:00
hwpoison-inject.c
hwpoison-inject: no need to check return value of debugfs_create functions
2019-06-03 15:39:40 +02:00
init-mm.c
mm: Allocate the mm_cpumask (mm->cpu_bitmap[]) dynamically based on nr_cpu_ids
2018-07-17 09:35:30 +02:00
internal.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
interval_tree.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 248
2019-06-19 17:09:08 +02:00
Kconfig
mm: remove CONFIG_MIGRATE_VMA_HELPER
2019-08-20 09:35:03 -03:00
Kconfig.debug
mm, debug_pagealloc: use a page type instead of page_ext flag
2019-07-12 11:05:43 -07:00
khugepaged.c
Revert "mm: page cache: store only head pages in i_pages"
2019-07-05 19:55:18 -07:00
kmemleak-test.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333
2019-06-05 17:37:06 +02:00
kmemleak.c
mm: kmemleak: disable early logging in case of error
2019-08-13 16:06:52 -07:00
ksm.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 482
2019-06-19 17:09:52 +02:00
list_lru.c
mm: memcg/slab: stop setting page->mem_cgroup pointer for slab pages
2019-07-12 11:05:44 -07:00
maccess.c
The main changes in this release include:
2019-07-18 11:51:00 -07:00
madvise.c
mm: remove MEMORY_DEVICE_PUBLIC support
2019-07-02 14:32:43 -03:00
Makefile
memremap: move from kernel/ to mm/
2019-08-03 07:02:01 -07:00
memblock.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
memcontrol.c
mm: workingset: fix vmstat counters for shadow nodes
2019-08-13 16:06:52 -07:00
memfd.c
Revert "mm: page cache: store only head pages in i_pages"
2019-07-05 19:55:18 -07:00
memory_hotplug.c
mm/memory_hotplug.c: remove unneeded return for void function
2019-08-03 07:02:01 -07:00
memory-failure.c
HMM patches for 5.3
2019-07-14 19:42:11 -07:00
memory.c
mm: thp: make transhuge_vma_suitable available for anonymous THP
2019-07-18 17:08:06 -07:00
mempolicy.c
Revert "mm, thp: restore node-local hugepage allocations"
2019-08-13 16:06:52 -07:00
mempool.c
docs/core-api/mm: fix return value descriptions in mm/
2019-03-05 21:07:20 -08:00
memremap.c
Merge branch 'odp_fixes' into hmm.git
2019-08-21 20:58:18 -03:00
memtest.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
migrate.c
Merge branch 'odp_fixes' into hmm.git
2019-08-21 20:58:18 -03:00
mincore.c
mm/mincore.c: fix race between swapoff and mincore
2019-07-12 11:05:43 -07:00
mlock.c
mm/mlock.c: change count_mm_mlocked_page_nr return type
2019-06-13 17:34:56 -10:00
mm_init.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
mmap.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
mmu_context.c
sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h>
2017-03-02 08:42:38 +01:00
mmu_gather.c
mm: mmu_gather: remove __tlb_reset_range() for force flush
2019-06-13 17:34:56 -10:00
mmu_notifier.c
mm/mmu_notifiers: remove unregister_no_release
2019-08-21 20:58:19 -03:00
mmzone.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mprotect.c
mm/mprotect.c: fix compilation warning because of unused 'mm' variable
2019-05-14 09:47:51 -07:00
mremap.c
mm/mmu_notifier: contextual information for event triggering invalidation
2019-05-14 09:47:49 -07:00
msync.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nommu.c
mm: fix the MAP_UNINITIALIZED flag
2019-07-16 19:23:21 -07:00
oom_kill.c
mm/oom_kill.c: remove redundant OOM score normalization in select_bad_process()
2019-07-12 11:05:47 -07:00
page_alloc.c
memremap: remove the dev field in struct dev_pagemap
2019-08-20 09:41:35 -03:00
page_counter.c
memcg: introduce memory.min
2018-06-07 17:34:36 -07:00
page_ext.c
mm, debug_pagealloc: use a page type instead of page_ext flag
2019-07-12 11:05:43 -07:00
page_idle.c
mm/page_idle.c: fix oops because end_pfn is larger than max_pfn
2019-06-29 16:43:45 +08:00
page_io.c
mm, swap: use rbtree for swap_extent
2019-07-12 11:05:43 -07:00
page_isolation.c
mm/page_isolation.c: change the prototype of undo_isolate_page_range()
2019-07-12 11:05:43 -07:00
page_owner.c
mm/page_owner: Simplify stack trace handling
2019-04-29 12:37:50 +02:00
page_poison.c
page_poison: play nicely with KASAN
2019-03-05 21:07:13 -08:00
page_vma_mapped.c
mm/rmap: map_pte() was not handling private ZONE_DEVICE page properly
2018-10-31 08:54:11 -07:00
page-writeback.c
mm: remove the account_page_dirtied export
2019-07-12 11:05:42 -07:00
pagewalk.c
mm: kernel-doc: add missing parameter descriptions
2018-04-05 21:36:27 -07:00
percpu-internal.h
percpu: convert chunk hints to be based on pcpu_block_md
2019-03-13 12:25:31 -07:00
percpu-km.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428
2019-06-05 17:37:16 +02:00
percpu-stats.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428
2019-06-05 17:37:16 +02:00
percpu-vm.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428
2019-06-05 17:37:16 +02:00
percpu.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428
2019-06-05 17:37:16 +02:00
pgtable-generic.c
x86/mm: Page size aware flush_tlb_mm_range()
2018-10-09 16:51:11 +02:00
process_vm_access.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
quicklist.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
readahead.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
rmap.c
mm/hmm: fix bad subpage pointer in try_to_unmap_one
2019-08-13 16:06:52 -07:00
rodata_test.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441
2019-06-05 17:37:17 +02:00
shmem.c
Revert "Revert "mm, thp: consolidate THP gfp handling into alloc_hugepage_direct_gfpmask""
2019-08-13 16:06:52 -07:00
shuffle.c
mm: maintain randomization of page free lists
2019-05-14 19:52:48 -07:00
shuffle.h
mm: maintain randomization of page free lists
2019-05-14 19:52:48 -07:00
slab_common.c
mm/slab_common.c: work around clang bug #42570
2019-07-16 19:23:21 -07:00
slab.c
mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options
2019-07-12 11:05:46 -07:00
slab.h
mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options
2019-07-12 11:05:46 -07:00
slob.c
mm/slab: refactor common ksize KASAN logic into slab_common.c
2019-07-12 11:05:42 -07:00
slub.c
mm: slub: Fix slab walking for init_on_free
2019-07-31 13:16:06 -07:00
sparse-vmemmap.c
mm/sparsemem: convert kmalloc_section_memmap() to populate_section_memmap()
2019-07-18 17:08:07 -07:00
sparse.c
mm/sparsemem: cleanup 'section number' data types
2019-07-18 17:08:07 -07:00
swap_cgroup.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
swap_slots.c
mm, swap, get_swap_pages: use entry_size instead of cluster in parameter
2018-08-22 10:52:44 -07:00
swap_state.c
mm/swap_state.c: simplify total_swapcache_pages() with get_swap_device()
2019-07-12 11:05:43 -07:00
swap.c
docs: admin-guide: move sysctl directory to it
2019-07-15 11:03:01 -03:00
swapfile.c
mm, swap: use rbtree for swap_extent
2019-07-12 11:05:43 -07:00
truncate.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
usercopy.c
mm/usercopy: use memory range to be accessed for wraparound check
2019-08-13 16:06:52 -07:00
userfaultfd.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 499
2019-06-19 17:09:53 +02:00
util.c
mm: add account_locked_vm utility function
2019-07-16 19:23:25 -07:00
vmacache.c
mm: get rid of vmacache_flush_all() entirely
2018-09-13 15:18:04 -10:00
vmalloc.c
mm/vmalloc.c: fix percpu free VM area search criteria
2019-08-13 16:06:52 -07:00
vmpressure.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
vmscan.c
mm, vmscan: do not special-case slab reclaim when watermarks are boosted
2019-08-13 16:06:53 -07:00
vmstat.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
workingset.c
mm: workingset: fix vmstat counters for shadow nodes
2019-08-13 16:06:52 -07:00
z3fold.c
mm/z3fold.c: fix z3fold_destroy_pool() race condition
2019-08-13 16:06:52 -07:00
zbud.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
zpool.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
zsmalloc.c
Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2019-07-19 10:42:02 -07:00
zswap.c
zswap: ignore debugfs_create_dir() return value
2019-06-03 15:39:39 +02:00