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Will Deacon b2a84de2a2 mm/mremap: Add comment explaining the untagging behaviour of mremap() 
Commit dcde237319e6 ("mm: Avoid creating virtual address aliases in
brk()/mmap()/mremap()") changed mremap() so that only the 'old' address
is untagged, leaving the 'new' address in the form it was passed from
userspace. This prevents the unexpected creation of aliasing virtual
mappings in userspace, but looks a bit odd when you read the code.

Add a comment justifying the untagging behaviour in mremap().

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2020-03-26 11:28:57 +00:00
..
kasan
RISC-V Patches for the 5.6 Merge Window, Part 1
2020-01-31 11:23:29 -08:00
backing-dev.c
memcg: fix a crash in wb_workfn when a device disappears
2020-01-31 10:30:36 -08:00
balloon_compaction.c
mm/balloon_compaction: suppress allocation warnings
2019-09-04 07:42:01 -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: use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops
2019-12-01 12:59:09 -08:00
cma.c
mm/cma.c: switch to bitmap_zalloc() for cma bitmap allocation
2019-12-01 12:59:09 -08:00
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: fix wrong pfn handling in __reset_isolation_pfn()
2019-10-14 15:04:01 -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/hotplug: silence a lockdep splat with printk()
2020-01-31 10:30:39 -08:00
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.c: use %pa to print resource_size_t variables
2020-01-31 10:30:38 -08:00
fadvise.c
fs: Export generic_fadvise()
2019-08-30 22:43:58 -07:00
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: clean up filemap_write_and_wait()
2020-01-31 10:30:37 -08:00
frame_vector.c
mm: untag user pointers in get_vaddr_frames
2019-09-25 17:51:41 -07:00
frontswap.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 482
2019-06-19 17:09:52 +02:00
gup_benchmark.c
mm/gup_benchmark: use proper FOLL_WRITE flags instead of hard-coding "1"
2020-01-31 10:30:38 -08:00
gup.c
asm-generic/tlb: rename HAVE_RCU_TABLE_FREE
2020-02-04 03:05:26 +00:00
highmem.c
mm, x86/mm: Untangle address space layout definitions from basic pgtable type definitions
2019-12-10 10:12:55 +01:00
hmm.c
mm: pagewalk: add 'depth' parameter to pte_hole
2020-02-04 03:05:25 +00:00
huge_memory.c
Merge branch 'akpm' (patches from Andrew)
2020-01-31 12:16:36 -08:00
hugetlb_cgroup.c
mm: hugetlb controller for cgroups v2
2019-12-16 12:41:40 -08:00
hugetlb.c
mm/hugetlb: defer freeing of huge pages if in non-task context
2020-01-04 13:55:09 -08:00
hwpoison-inject.c
mm/hwpoison-inject: use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops
2019-12-01 12:59:09 -08:00
init-mm.c
mm/init-mm.c: include <linux/mman.h> for vm_committed_as_batch
2019-10-19 06:32:32 -04:00
internal.h
mm, pcpu: make zone pcp updates and reset internal to the mm
2019-12-01 12:59:06 -08:00
interval_tree.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 248
2019-06-19 17:09:08 +02:00
Kconfig
mm/Kconfig: fix trivial help text punctuation
2019-12-01 12:59:10 -08:00
Kconfig.debug
mm: add generic ptdump
2020-02-04 03:05:25 +00:00
khugepaged.c
mm/thp: flush file for !is_shmem PageDirty() case in collapse_file()
2019-12-01 12:59:09 -08:00
kmemleak-test.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333
2019-06-05 17:37:06 +02:00
kmemleak.c
mm/kmemleak: turn kmemleak_lock and object->lock to raw_spinlock_t
2020-01-31 10:30:36 -08:00
ksm.c
* PPC secure guest support
2019-12-04 11:08:30 -08:00
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
uaccess: Add strict non-pagefault kernel-space read function
2019-11-02 12:39:12 -07:00
madvise.c
mm: make do_madvise() available internally
2020-01-20 17:04:02 -07:00
Makefile
mm: add generic ptdump
2020-02-04 03:05:25 +00:00
mapping_dirty_helpers.c
mm: Add write-protect and clean utilities for address space ranges
2019-11-06 13:03:36 +01:00
memblock.c
memblock: Use __func__ in remaining memblock_dbg() call sites
2020-01-31 10:30:38 -08:00
memcontrol.c
mm/memcontrol.c: lost css_put in memcg_expand_shrinker_maps()
2020-02-21 11:22:15 -08:00
memfd.c
mm: page cache: store only head pages in i_pages
2019-09-24 15:54:08 -07:00
memory_hotplug.c
mm/memory_hotplug: drop valid_start/valid_end from test_pages_in_a_zone()
2020-02-04 03:05:23 +00:00
memory-failure.c
mm/memory-failure.c: use page_shift() in add_to_kill()
2019-12-01 12:59:04 -08:00
memory.c
drm ttm/mm changes for 5.6-rc1
2020-02-04 07:21:04 +00:00
mempolicy.c
mm/mempolicy.c: fix out of bounds write in mpol_parse_str()
2020-01-31 10:30:36 -08:00
mempool.c
docs/core-api/mm: fix return value descriptions in mm/
2019-03-05 21:07:20 -08:00
memremap.c
mm/memory_hotplug: poison memmap in remove_pfn_range_from_zone()
2020-02-04 03:05:23 +00:00
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
mm: pagewalk: add 'depth' parameter to pte_hole
2020-02-04 03:05:25 +00:00
mincore.c
mm: pagewalk: add 'depth' parameter to pte_hole
2020-02-04 03:05:25 +00:00
mlock.c
mm: untag user pointers passed to memory syscalls
2019-09-25 17:51:41 -07:00
mm_init.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
mmap.c
mm: Avoid creating virtual address aliases in brk()/mmap()/mremap()
2020-02-20 10:03:14 +00:00
mmu_context.c
…
mmu_gather.c
asm-generic/tlb: provide MMU_GATHER_TABLE_FREE
2020-02-04 03:05:26 +00:00
mmu_notifier.c
mm/mmu_notifiers: Use 'interval_sub' as the variable for mmu_interval_notifier
2020-01-14 11:54:47 -04:00
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
autonuma: reduce cache footprint when scanning page tables
2019-12-01 12:59:09 -08:00
mremap.c
mm/mremap: Add comment explaining the untagging behaviour of mremap()
2020-03-26 11:28:57 +00:00
msync.c
mm: untag user pointers passed to memory syscalls
2019-09-25 17:51:41 -07:00
nommu.c
mm/mmap.c: rb_parent is not necessary in __vma_link_list()
2019-12-01 06:29:19 -08:00
oom_kill.c
mm, oom: dump stack of victim when reaping failed
2020-01-31 10:30:38 -08:00
page_alloc.c
mm/memmap_init: update variable name in memmap_init_zone
2020-02-04 03:05:23 +00:00
page_counter.c
memcg: introduce memory.min
2018-06-07 17:34:36 -07:00
page_ext.c
mm, page_owner: fix off-by-one error in __set_page_owner_handle()
2019-10-14 15:04:00 -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
fs: Enable bmap() function to properly return errors
2020-02-03 08:05:37 -05:00
page_isolation.c
mm/page_isolation: fix potential warning from user
2020-01-31 10:30:39 -08:00
page_owner.c
mm/page_owner: don't access uninitialized memmaps when reading /proc/pagetypeinfo
2019-10-19 06:32:31 -04:00
page_poison.c
mm/page_poison.c: fix a typo in a comment
2019-09-24 15:54:08 -07:00
page_vma_mapped.c
mm/page_vma_mapped.c: explicitly compare pfn for normal, hugetlbfs and THP page
2020-01-31 10:30:38 -08:00
page-writeback.c
mm/page-writeback.c: improve arithmetic divisions
2020-01-13 18:19:02 -08:00
pagewalk.c
x86: mm: avoid allocating struct mm_struct on the stack
2020-02-04 03:05:25 +00:00
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
bitmap: genericize percpu bitmap region iterators
2020-01-20 16:40:56 +01:00
pgtable-generic.c
asm-generic/mm: stub out p{4,u}d_clear_bad() if __PAGETABLE_P{4,U}D_FOLDED
2019-12-01 06:29:19 -08:00
process_vm_access.c
mm, tree-wide: rename put_user_page*() to unpin_user_page*()
2020-01-31 10:30:38 -08:00
ptdump.c
x86: mm: avoid allocating struct mm_struct on the stack
2020-02-04 03:05:25 +00:00
readahead.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
rmap.c
mm, thp: do not queue fully unmapped pages for deferred split
2019-12-01 12:59:09 -08:00
rodata_test.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441
2019-06-05 17:37:17 +02:00
shmem.c
tmpfs: switch to use of invalfc()
2020-02-07 14:48:44 -05:00
shuffle.c
mm: fix -Wmissing-prototypes warnings
2019-10-07 15:47:19 -07:00
shuffle.h
mm: maintain randomization of page free lists
2019-05-14 19:52:48 -07:00
slab_common.c
proc: convert everything to "struct proc_ops"
2020-02-04 03:05:26 +00:00
slab.c
mm, debug_pagealloc: don't rely on static keys too early
2020-01-13 18:19:02 -08:00
slab.h
mm: clean up and clarify lruvec lookup procedure
2019-12-01 12:59:06 -08:00
slob.c
mm, sl[aou]b: guarantee natural alignment for kmalloc(power-of-two)
2019-10-07 15:47:20 -07:00
slub.c
mm/slub.c: avoid slub allocation while holding list_lock
2020-01-31 10:30:36 -08:00
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: pfn_to_page is not valid yet on SPARSEMEM
2020-02-21 11:22:15 -08:00
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: page cache: store only head pages in i_pages
2019-09-24 15:54:08 -07:00
swap.c
mm: devmap: refactor 1-based refcounting for ZONE_DEVICE pages
2020-01-31 10:30:37 -08:00
swapfile.c
mm/swapfile.c: fix a comment in sys_swapon()
2020-02-21 11:22:15 -08:00
truncate.c
mm/thp: allow dropping THP from page cache
2019-10-19 06:32:33 -04:00
usercopy.c
usercopy: Avoid HIGHMEM pfn warning
2019-09-17 15:20:17 -07:00
userfaultfd.c
mm: fix typos in comments when calling __SetPageUptodate()
2019-12-01 12:59:10 -08:00
util.c
mm/mmap.c: rb_parent is not necessary in __vma_link_list()
2019-12-01 06:29:19 -08:00
vmacache.c
mm: get rid of vmacache_flush_all() entirely
2018-09-13 15:18:04 -10:00
vmalloc.c
Linux 5.5-rc7
2020-01-20 08:05:16 +01:00
vmpressure.c
mm/vmpressure.c: fix a signedness bug in vmpressure_register_event()
2019-10-07 15:47:19 -07:00
vmscan.c
mm/vmscan.c: don't round up scan size for online memory cgroup
2020-02-21 11:22:15 -08:00
vmstat.c
mm/memcontrol: use vmstat names for printing statistics
2019-12-04 19:44:11 -08:00
workingset.c
mm: vmscan: detect file thrashing at the reclaim root
2019-12-01 12:59:07 -08:00
z3fold.c
mm/z3fold.c: add inter-page compaction
2019-12-01 12:59:07 -08:00
zbud.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
zpool.c
zpool: add malloc_support_movable to zpool_driver
2019-09-24 15:54:12 -07:00
zsmalloc.c
mm/zsmalloc.c: fix the migrated zspage statistics.
2020-01-04 13:55:09 -08:00
zswap.c
zswap: potential NULL dereference on error in init_zswap()
2020-01-31 10:30:39 -08:00