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linux/mm
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Linus Torvalds 423913ad4a mmap: relax file size limit for regular files 
Commit be83bbf806 ("mmap: introduce sane default mmap limits") was
introduced to catch problems in various ad-hoc character device drivers
doing mmap and getting the size limits wrong.  In the process, it used
"known good" limits for the normal cases of mapping regular files and
block device drivers.

It turns out that the "s_maxbytes" limit was less "known good" than I
thought.  In particular, /proc doesn't set it, but exposes one regular
file to mmap: /proc/vmcore.  As a result, that file got limited to the
default MAX_INT s_maxbytes value.

This went unnoticed for a while, because apparently the only thing that
needs it is the s390 kernel zfcpdump, but there might be other tools
that use this too.

Vasily suggested just changing s_maxbytes for all of /proc, which isn't
wrong, but makes me nervous at this stage.  So instead, just make the
new mmap limit always be MAX_LFS_FILESIZE for regular files, which won't
affect anything else.  It wasn't the regular file case I was worried
about.

I'd really prefer for maxsize to have been per-inode, but that is not
how things are today.

Fixes: be83bbf806 ("mmap: introduce sane default mmap limits")
Reported-by: Vasily Gorbik <gor@linux.ibm.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-05-19 09:29:11 -07:00
..
kasan slab, slub: skip unnecessary kasan_cache_shutdown() 2018-04-05 21:36:24 -07:00
backing-dev.c bdi: Fix use after free bug in debugfs_remove() 2018-05-03 09:36:24 -06:00
balloon_compaction.c
bootmem.c
cleancache.c
cma_debug.c
cma.c mm/cma: manage the memory of the CMA area by using the ZONE_MOVABLE 2018-04-11 10:28:32 -07:00
cma.h
compaction.c mm/cma: remove ALLOC_CMA 2018-04-11 10:28:32 -07:00
debug_page_ref.c
debug.c
dmapool.c
early_ioremap.c
fadvise.c mm: add ksys_fadvise64_64() helper; remove in-kernel call to sys_fadvise64_64() 2018-04-02 20:16:10 +02:00
failslab.c mm: make should_failslab always available for fault injection 2018-04-05 21:36:26 -07:00
filemap.c mm/filemap.c: fix NULL pointer in page_cache_tree_insert() 2018-04-20 17:18:36 -07:00
frame_vector.c
frontswap.c
gup_benchmark.c mm/gup_benchmark: handle gup failures 2018-04-13 17:10:27 -07:00
gup.c proc: do not access cmdline nor environ from file-backed areas 2018-05-17 09:27:47 -07:00
highmem.c
hmm.c mm/hmm.c: remove superfluous RCU protection around radix tree lookup 2018-04-11 10:28:31 -07:00
huge_memory.c mm: enable thp migration for shmem thp 2018-04-20 17:18:35 -07:00
hugetlb_cgroup.c
hugetlb.c mm, hugetlbfs: introduce ->pagesize() to vm_operations_struct 2018-04-05 21:36:26 -07:00
hwpoison-inject.c
init-mm.c
internal.h mm/cma: remove ALLOC_CMA 2018-04-11 10:28:32 -07:00
interval_tree.c
Kconfig mm: don't allow deferred pages with NEED_PER_CPU_KM 2018-05-18 17:17:12 -07:00
Kconfig.debug
khugepaged.c page cache: use xa_lock 2018-04-11 10:28:39 -07:00
kmemleak-test.c
kmemleak.c mm: kernel-doc: add missing parameter descriptions 2018-04-05 21:36:27 -07:00
ksm.c mm/ksm.c: fix inconsistent accounting of zero pages 2018-04-11 10:28:31 -07:00
list_lru.c mm: make counting of list_lru_one::nr_items lockless 2018-04-05 21:36:27 -07:00
maccess.c
madvise.c
Makefile mm/swap_slots.c: use conditional compilation 2018-04-05 21:36:24 -07:00
memblock.c powerpc updates for 4.17 2018-04-07 12:08:19 -07:00
memcontrol.c mm: memcg: add __GFP_NOWARN in __memcg_schedule_kmem_cache_create() 2018-04-20 17:18:36 -07:00
memory_hotplug.c mm: unclutter THP migration 2018-04-11 10:28:32 -07:00
memory-failure.c mm, migrate: remove reason argument from new_page_t 2018-04-11 10:28:32 -07:00
memory.c mm: swap: unify cluster-based and vma-based swap readahead 2018-04-05 21:36:25 -07:00
mempolicy.c mm: unclutter THP migration 2018-04-11 10:28:32 -07:00
mempool.c
memtest.c
migrate.c mm: migrate: fix double call of radix_tree_replace_slot() 2018-05-11 17:28:45 -07:00
mincore.c
mlock.c
mm_init.c
mmap.c mmap: relax file size limit for regular files 2018-05-19 09:29:11 -07:00
mmu_context.c
mmu_notifier.c
mmzone.c
mprotect.c sched/numa: avoid trapping faults and attempting migration of file-backed dirty pages 2018-04-11 10:28:31 -07:00
mremap.c
msync.c
nobootmem.c
nommu.c mm/nommu: remove description of alloc_vm_area 2018-04-05 21:36:26 -07:00
oom_kill.c mm, oom: fix concurrent munlock and oom reaper unmap, v3 2018-05-11 17:28:45 -07:00
page_alloc.c xen, mm: allow deferred page initialization for xen pv domains 2018-04-11 10:28:38 -07:00
page_counter.c
page_ext.c
page_idle.c mm: thp: fix potential clearing to referenced flag in page_idle_clear_pte_refs_one() 2018-04-05 21:36:25 -07:00
page_io.c
page_isolation.c mm, migrate: remove reason argument from new_page_t 2018-04-11 10:28:32 -07:00
page_owner.c mm/page_owner.c: make early_page_owner_param() __init 2018-04-05 21:36:26 -07:00
page_poison.c mm/page_poison.c: make early_page_poison_param() __init 2018-04-05 21:36:26 -07:00
page_vma_mapped.c
page-writeback.c writeback: safer lock nesting 2018-04-20 17:18:35 -07:00
pagewalk.c mm: kernel-doc: add missing parameter descriptions 2018-04-05 21:36:27 -07:00
percpu-internal.h
percpu-km.c
percpu-stats.c mm: reuse DEFINE_SHOW_ATTRIBUTE() macro 2018-04-05 21:36:25 -07:00
percpu-vm.c
percpu.c arch: remove obsolete architecture ports 2018-04-02 20:20:12 -07:00
pgtable-generic.c
process_vm_access.c
quicklist.c
readahead.c page cache: use xa_lock 2018-04-11 10:28:39 -07:00
rmap.c mm: enable thp migration for shmem thp 2018-04-20 17:18:35 -07:00
rodata_test.c
shmem.c page cache: use xa_lock 2018-04-11 10:28:39 -07:00
slab_common.c mm: make should_failslab always available for fault injection 2018-04-05 21:36:26 -07:00
slab.c mm, slab: reschedule cache_reap() on the same CPU 2018-04-13 17:10:27 -07:00
slab.h slab, slub: skip unnecessary kasan_cache_shutdown() 2018-04-05 21:36:24 -07:00
slob.c
slub.c kasan, slub: fix handling of kasan_slab_free hook 2018-04-11 10:28:32 -07:00
sparse-vmemmap.c
sparse.c mm: sections are not offlined during memory hotremove 2018-05-11 17:28:45 -07:00
swap_cgroup.c
swap_slots.c mm/swap_slots.c: use conditional compilation 2018-04-05 21:36:24 -07:00
swap_state.c page cache: use xa_lock 2018-04-11 10:28:39 -07:00
swap.c mm/swap.c: remove @cold parameter description for release_pages() 2018-04-05 21:36:26 -07:00
swapfile.c mm/swapfile.c: make pointer swap_avail_heads static 2018-04-11 10:28:32 -07:00
truncate.c page cache: use xa_lock 2018-04-11 10:28:39 -07:00
usercopy.c
userfaultfd.c
util.c mm/gup.c: document return value 2018-04-13 17:10:27 -07:00
vmacache.c
vmalloc.c
vmpressure.c
vmscan.c mm,vmscan: Allow preallocating memory for register_shrinker(). 2018-04-16 02:06:47 -04:00
vmstat.c mm: don't show nr_indirectly_reclaimable in /proc/vmstat 2018-05-11 17:28:45 -07:00
workingset.c page cache: use xa_lock 2018-04-11 10:28:39 -07:00
z3fold.c z3fold: fix reclaim lock-ups 2018-05-11 17:28:45 -07:00
zbud.c
zpool.c
zsmalloc.c mm: kernel-doc: add missing parameter descriptions 2018-04-05 21:36:27 -07:00
zswap.c