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linux/mm
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Linus Torvalds ee60e293b3 mmap: relax file size limit for regular files 
commit 423913ad4a upstream.

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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
History 2018-10-21 08:46:08 +01:00
..
backing-dev.c block: fix bdi vs gendisk lifetime mismatch 2016-11-20 01:17:05 +00:00
balloon_compaction.c mm/balloon_compaction: fix deflation when compaction is disabled 2016-06-15 21:29:35 +01:00
bootmem.c mem-hotplug: reset node managed pages when hot-adding a new pgdat 2014-11-27 11:21:50 +00:00
cleancache.c mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE 2014-01-23 16:36:50 -08:00
compaction.c mm/balloon_compaction: redesign ballooned pages management 2016-06-15 21:29:35 +01:00
debug-pagealloc.c mm, x86: Remove debug_pagealloc_enabled 2011-12-06 09:24:07 +01:00
dmapool.c Fix unbalanced mutex in dma_pool_create(). 2014-10-05 13:41:09 -07:00
early_ioremap.c mm: create generic early_ioremap() support 2014-04-07 16:36:15 -07:00
fadvise.c teach SYSCALL_DEFINE<n> how to deal with long long/unsigned long long 2013-03-03 22:46:22 -05:00
failslab.c switch debugfs to umode_t 2012-01-03 22:54:56 -05:00
filemap.c mm/filemap.c: fix NULL pointer in page_cache_tree_insert() 2018-10-21 08:45:34 +01:00
filemap_xip.c mm: drop vm_ops->remap_pages and generic_file_remap_pages() stub 2018-10-03 04:09:51 +01:00
frontswap.c mm: frontswap: invalidate expired data on a dup-store failure 2014-12-10 17:49:41 +00:00
gup.c mm: remove rest usage of VM_NONLINEAR and pte_file() 2018-10-03 04:09:52 +01:00
highmem.c Some nice cleanups, and even a patch my wife did as a "live" demo for 2012-12-20 08:37:05 -08:00
huge_memory.c mm, thp: Do not make page table dirty unconditionally in touch_p[mu]d() 2018-01-01 20:52:09 +00:00
hugetlb.c hugetlbfs: check for pgoff value overflow 2018-06-16 22:21:33 +01:00
hugetlb_cgroup.c cgroup: remove css_parent() 2014-05-16 13:22:48 -04:00
hwpoison-inject.c mm/hwpoison: add '#' to hwpoison_inject 2014-01-21 16:19:48 -08:00
init-mm.c mm: Add a user_ns owner to mm_struct and fix ptrace permission checks 2018-01-01 20:52:10 +00:00
internal.h mm, compaction: properly signal and act upon lock and need_sched() contention 2014-06-04 16:54:11 -07:00
interval_tree.c mm: replace vma->sharead.linear with vma->shared 2018-10-03 04:09:52 +01:00
iov_iter.c Fix thinko in iov_iter_single_seg_count 2014-11-27 11:21:48 +00:00
Kconfig mm/zsmalloc: make zsmalloc module-buildable 2014-06-04 16:54:14 -07:00
Kconfig.debug mm: more intensive memory corruption debugging 2012-01-10 16:30:42 -08:00
kmemcheck.c kmemcheck: Fix build errors due to missing slab.h 2010-03-30 22:02:32 +09:00
kmemleak-test.c mm/kmemleak-test.c: use pr_fmt for logging 2014-06-06 16:08:18 -07:00
kmemleak.c mm: kmemleak: allow safe memory scanning during kmemleak disabling 2015-07-15 10:00:54 +01:00
ksm.c mm: remove rest usage of VM_NONLINEAR and pte_file() 2018-10-03 04:09:52 +01:00
list_lru.c mm: keep page cache radix tree nodes in check 2014-04-03 16:21:01 -07:00
maccess.c mm: Map most files to use export.h instead of module.h 2011-10-31 09:20:12 -04:00
madvise.c mm: remove rest usage of VM_NONLINEAR and pte_file() 2018-10-03 04:09:52 +01:00
Makefile mm: replace remap_file_pages() syscall with emulation 2018-10-03 04:09:50 +01:00
memblock.c memblock, memhotplug: fix wrong type in memblock_find_in_range_node(). 2014-10-05 13:41:03 -07:00
memcontrol.c mm: remove rest usage of VM_NONLINEAR and pte_file() 2018-10-03 04:09:52 +01:00
memory-failure.c mm/memory-failure.c: use compound_head() flags for huge pages 2017-09-15 18:30:12 +01:00
memory.c x86/speculation/l1tf: Disallow non privileged high MMIO PROT_NONE mappings 2018-10-03 04:10:02 +01:00
memory_hotplug.c mm/memory_hotplug: define find_{smallest|biggest}_section_pfn as unsigned long 2018-01-01 20:51:48 +00:00
mempolicy.c mm/mempolicy.c: avoid use uninitialized preferred_node 2018-06-16 22:22:47 +01:00
mempool.c mm/mempool.c: update the kmemleak stack trace for mempool allocations 2014-06-06 16:08:17 -07:00
migrate.c rmap: drop support of non-linear mappings 2018-10-03 04:09:51 +01:00
mincore.c mm: remove rest usage of VM_NONLINEAR and pte_file() 2018-10-03 04:09:52 +01:00
mlock.c mlock: fix mlock count can not decrease in race condition 2017-09-15 18:29:55 +01:00
mm_init.c mm: bring back /sys/kernel/mm 2014-01-27 21:02:39 -08:00
mmap.c mmap: relax file size limit for regular files 2018-10-21 08:46:08 +01:00
mmu_context.c mm/mmu_context, sched/core: Fix mmu_context.h assumption 2018-01-09 00:35:08 +00:00
mmu_notifier.c mm: audit/fix non-modular users of module_init in core code 2014-01-23 16:36:52 -08:00
mmzone.c mm: numa: Change page last {nid,pid} into {cpu,pid} 2013-10-09 14:47:45 +02:00
mprotect.c x86/speculation/l1tf: Disallow non privileged high MMIO PROT_NONE mappings 2018-10-03 04:10:02 +01:00
mremap.c mm: remove rest usage of VM_NONLINEAR and pte_file() 2018-10-03 04:09:52 +01:00
msync.c mm: remove rest usage of VM_NONLINEAR and pte_file() 2018-10-03 04:09:52 +01:00
nobootmem.c mem-hotplug: reset node managed pages when hot-adding a new pgdat 2014-11-27 11:21:50 +00:00
nommu.c mm: replace remap_file_pages() syscall with emulation 2018-10-03 04:09:50 +01:00
oom_kill.c OOM, PM: OOM killed task shouldn't escape PM suspend 2014-11-05 11:43:09 +00:00
page-writeback.c writeback: use |1 instead of +1 to protect against div by zero 2015-05-20 13:25:57 +01:00
page_alloc.c mm/init: fix zone boundary creation 2017-11-11 13:33:41 +00:00
page_cgroup.c swap: cond_resched in swap_cgroup_prepare() 2017-09-15 18:30:12 +01:00
page_io.c fix __swap_writepage() compile failure on old gcc versions 2014-06-14 19:30:48 -05:00
page_isolation.c mm: fix invalid node in alloc_migrate_target() 2016-05-01 00:06:08 +02:00
pagewalk.c pagewalk: improve vma handling 2018-10-03 04:10:02 +01:00
percpu-km.c percpu: clear memory allocated with the km allocator 2010-10-02 10:28:42 +03:00
percpu-vm.c percpu: perform tlb flush after pcpu_map_pages() failure 2014-10-05 13:41:06 -07:00
percpu.c Revert "percpu: free percpu allocation info for uniprocessor system" 2014-11-14 15:20:06 +00:00
pgtable-generic.c mm: fix TLB flush race between migration, and change_protection_range 2013-12-18 19:04:51 -08:00
process_vm_access.c ptrace: use fsuid, fsgid, effective creds for fs access checks 2017-09-15 18:30:17 +01:00
quicklist.c mm: delete various needless include <linux/module.h> 2011-10-31 09:20:11 -04:00
readahead.c mm/readahead.c: inline ra_submit 2014-04-07 16:35:58 -07:00
rmap.c rmap: drop support of non-linear mappings 2018-10-03 04:09:51 +01:00
shmem.c mm: drop vm_ops->remap_pages and generic_file_remap_pages() stub 2018-10-03 04:09:51 +01:00
slab.c cpuset: PF_SPREAD_PAGE and PF_SPREAD_SLAB should be atomic flags 2017-10-12 15:28:22 +01:00
slab.h memcg, slab: merge memcg_{bind,release}_pages to memcg_{un}charge_slab 2014-06-04 16:54:01 -07:00
slab_common.c Merge branch 'slab/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux into for-3.16-rcX 2014-07-22 18:38:27 -04:00
slob.c slab: get_online_mems for kmem_cache_{create,destroy,shrink} 2014-06-04 16:53:59 -07:00
slub.c slub/memcg: cure the brainless abuse of sysfs attributes 2017-09-15 18:29:54 +01:00
sparse-vmemmap.c mm/sparse: use memblock apis for early memory allocations 2014-01-21 16:19:47 -08:00
sparse.c mm: use macros from compiler.h instead of __attribute__((...)) 2014-04-07 16:35:54 -07:00
swap.c rmap: drop support of non-linear mappings 2018-10-03 04:09:51 +01:00
swap_state.c mm: page_alloc: convert hot/cold parameter and immediate callers to bool 2014-06-04 16:54:09 -07:00
swapfile.c x86/speculation/l1tf: Limit swap file size to MAX_PA/2 2018-10-03 04:10:03 +01:00
truncate.c mm: Remove false WARN_ON from pagecache_isize_extended() 2014-11-13 11:49:03 +00:00
util.c vm_is_stack: use for_each_thread() rather then buggy while_each_thread() 2014-09-05 16:36:43 -07:00
vmacache.c mm: get rid of vmacache_flush_all() entirely 2018-09-25 23:47:35 +01:00
vmalloc.c mm/vmalloc.c: export unmap_kernel_range() 2014-06-04 16:54:14 -07:00
vmpressure.c mm: vmpressure: fix sending wrong events on underflow 2017-06-05 21:17:16 +01:00
vmscan.c mm: fix the NULL mapping case in __isolate_lru_page() 2018-06-16 22:22:04 +01:00
vmstat.c KAISER: Kernel Address Isolation 2018-01-09 00:35:13 +00:00
workingset.c mm: workingset: fix crash in shadow node shrinker caused by replace_page_cache_page() 2016-11-20 01:17:36 +00:00
zbud.c mm/zbud.c: make size unsigned like unique callsite 2014-06-04 16:54:13 -07:00
zsmalloc.c zsmalloc: fixup trivial zs size classes value in comments 2014-06-04 16:54:13 -07:00
zswap.c mm/zswap: NUMA aware allocation for zswap_dstmem 2014-06-04 16:54:14 -07:00