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David Herrmann e3609fdb39 mm: allow drivers to prevent new writable mappings 
This patch (of 6):

The i_mmap_writable field counts existing writable mappings of an
address_space.  To allow drivers to prevent new writable mappings, make
this counter signed and prevent new writable mappings if it is negative.
This is modelled after i_writecount and DENYWRITE.

This will be required by the shmem-sealing infrastructure to prevent any
new writable mappings after the WRITE seal has been set.  In case there
exists a writable mapping, this operation will fail with EBUSY.

Note that we rely on the fact that iff you already own a writable mapping,
you can increase the counter without using the helpers.  This is the same
that we do for i_writecount.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Ryan Lortie <desrt@desrt.ca>
Cc: Lennart Poettering <lennart@poettering.net>
Cc: Daniel Mack <zonque@gmail.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2020-10-08 05:52:37 -07:00
..
kasan kasan, module, vmalloc: rework shadow allocation for modules 2015-05-04 14:03:58 -07:00
Kconfig Import T813XXS2BRC2 kernel source changes 2018-05-26 00:39:42 +02:00
Kconfig.debug
…
Makefile mm: per-thread vma caching 2019-07-27 22:08:06 +02:00
backing-dev.c
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balloon_compaction.c
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bootmem.c
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bounce.c mm: convert some level-less printks to pr_* 2019-07-27 22:08:13 +02:00
cleancache.c
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compaction.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
debug-pagealloc.c mm/debug-pagealloc.c: print page physical address for 2015-08-23 23:19:22 -07:00
dmapool.c
…
early_ioremap.c
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fadvise.c mm/fadvise.c: fix signed overflow UBSAN complaint 2019-07-27 21:51:37 +02:00
failslab.c
…
filemap.c mm, fs: check for fatal signals in do_generic_file_read() 2019-07-27 21:43:51 +02:00
filemap_xip.c
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fremap.c
…
frontswap.c
…
highmem.c
…
huge_memory.c mm, thp: fix collapsing of hugepages on madvise 2019-07-27 22:08:13 +02:00
hugetlb.c mm: hugetlbfs: skip shared VMAs when unmapping private pages to satisfy a fault 2015-10-22 14:37:50 -07:00
hugetlb_cgroup.c
…
hwpoison-inject.c
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init-mm.c
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internal.h mm: Enhance per process reclaim to consider shared pages 2015-04-16 10:14:27 -07:00
interval_tree.c
…
kmemcheck.c
…
kmemleak-test.c
…
kmemleak.c mm: kmemleak: allow safe memory scanning during kmemleak disabling 2015-06-22 10:47:32 +05:30
ksm.c mm,ksm: fix endless looping in allocating memory when ksm enable 2019-07-27 21:42:51 +02:00
maccess.c
…
madvise.c mm/madvise.c: fix madvise() infinite loop under special circumstances 2019-07-27 21:45:21 +02:00
memblock.c
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memcontrol.c UPSTREAM: memcg: Only free spare array when readers are done 2016-05-18 14:36:06 +05:30
memory-failure.c mm: hwpoison: use do_send_sig_info() instead of force_sig() 2019-07-27 22:10:18 +02:00
memory.c mm: introduce vma_is_anonymous(vma) helper 2019-07-27 22:11:11 +02:00
memory_hotplug.c mm/memory_hotplug.c: check start_pfn in test_pages_in_a_zone() 2019-07-27 21:43:51 +02:00
mempolicy.c mm: convert some level-less printks to pr_* 2019-07-27 22:08:13 +02:00
mempool.c
…
memtest.c memtest: use phys_addr_t for physical addresses 2015-04-01 09:27:43 -07:00
migrate.c Sanitize 'move_pages()' permission checks 2019-07-27 21:44:50 +02:00
mincore.c mm/mincore.c: make mincore() more conservative 2019-07-27 22:11:11 +02:00
mlock.c mm: do not bug_on on incorrect length in __mm_populate() 2019-07-27 22:08:08 +02:00
mm_init.c
…
mmap.c mm: allow drivers to prevent new writable mappings 2020-10-08 05:52:37 -07:00
mmu_context.c
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mmu_notifier.c
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mmzone.c
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mprotect.c mm/mprotect: add a cond_resched() inside change_pmd_range() 2019-07-27 21:46:25 +02:00
mremap.c mremap: properly flush TLB before releasing the page 2019-07-27 21:53:28 +02:00
msync.c
…
nobootmem.c
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nommu.c mm: convert some level-less printks to pr_* 2019-07-27 22:08:13 +02:00
oom_kill.c mm, oom: fix use-after-free in oom_kill_process 2019-07-27 22:05:56 +02:00
page-writeback.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
page_alloc.c ANDROID: Remove conflicting Samsung options for upstream changes 2019-07-27 22:09:50 +02:00
page_cgroup.c
…
page_io.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
page_isolation.c mm: add zone counter for cma pages 2019-07-27 21:51:09 +02:00
pageowner.c
…
pagewalk.c pagewalk: improve vma handling 2019-07-27 21:51:51 +02:00
percpu-km.c
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percpu-vm.c
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percpu.c
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pgtable-generic.c
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process_reclaim.c Revert "lowmemorykiller: Introduce sysfs node for ALMK and PPR adj threshold" 2019-07-27 22:09:43 +02:00
process_vm_access.c ptrace: use fsuid, fsgid, effective creds for fs access checks 2016-02-25 11:57:47 -08:00
quicklist.c
…
readahead.c readahead: make context readahead more conservative 2019-07-27 21:49:54 +02:00
rmap.c mm: fix anon_vma->degree underflow in anon_vma endless growing prevention 2019-07-27 22:08:15 +02:00
shmem.c shm: add sealing API 2020-10-08 05:52:37 -07:00
showmem.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
slab.c cpuset: PF_SPREAD_PAGE and PF_SPREAD_SLAB should be atomic flags 2019-07-27 21:44:59 +02:00
slab.h
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slab_common.c mm: slub: add kernel address sanitizer support for slub allocator 2015-05-04 14:03:56 -07:00
slob.c
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slub.c mm: slub: add kernel address sanitizer support for slub allocator 2015-05-04 14:03:56 -07:00
sparse-vmemmap.c
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sparse.c
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swap.c
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swap_state.c mm: allow drivers to prevent new writable mappings 2020-10-08 05:52:37 -07:00
swapfile.c swapfile: fix memory corruption via malformed swapfile 2019-07-27 21:42:14 +02:00
truncate.c
…
util.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
vmacache.c mm: get rid of vmacache_flush_all() entirely 2019-07-27 22:08:09 +02:00
vmalloc.c mm/vmalloc.c: fix kernel BUG at mm/vmalloc.c:512! 2019-07-27 22:10:02 +02:00
vmpressure.c mm: vmpressure: fix sending wrong events on underflow 2019-07-27 21:43:56 +02:00
vmscan.c mm: convert some level-less printks to pr_* 2019-07-27 22:08:13 +02:00
vmstat.c Revert "lowmemorykiller: Don't count swap cache pages twice" 2019-07-27 22:09:45 +02:00
zbud.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zpool.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zsmalloc.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zswap.c Import latest Samsung release 2017-04-18 03:43:52 +02:00