Linus Torvalds 6ea1dc96a0 mmap: relax file size limit for regular files ... commit 423913ad4ae5b3e8fb8983f70969fb522261ba26 upstream. Commit be83bbf80682 ("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: be83bbf80682 ("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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-06-13 16:15:27 +02:00
..
kasan	kasan: fix memory hotplug during boot	2018-05-30 07:48:51 +02:00
backing-dev.c	writeback: fix the wrong congested state variable definition	2018-04-08 11:51:56 +02:00
balloon_compaction.c	virtio_balloon: fix race between migration and ballooning	2016-03-03 15:07:18 -08:00
bootmem.c
cleancache.c
cma_debug.c
cma.c	cma: fix calculation of aligned offset	2018-01-31 12:06:09 +01:00
cma.h
compaction.c	mm/compaction: pass only pageblock aligned range to pageblock_pfn_to_page	2018-01-17 09:35:26 +01:00
debug-pagealloc.c	mm, hwpoison: fixup "mm: check the return value of lookup_page_ext for all call sites"	2017-11-24 11:26:29 +01:00
debug.c	mm: make compound_head() robust	2015-11-06 17:50:42 -08:00
dmapool.c	mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd	2015-11-06 17:50:42 -08:00
early_ioremap.c	mm/early_ioremap: Fix boot hang with earlyprintk=efi,keep	2018-02-25 11:03:41 +01:00
fadvise.c
failslab.c	mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM	2015-11-06 17:50:42 -08:00
filemap.c	mm: filemap: avoid unnecessary calls to lock_page when waiting for IO to complete during a read	2018-05-26 08:48:54 +02:00
frame_vector.c	mm: fix docbook comment for get_vaddr_frames()	2015-11-05 19:34:48 -08:00
frontswap.c
gup.c	mm: larger stack guard gap, between vmas	2017-06-26 07:13:11 +02:00
highmem.c
huge_memory.c	thp: fix MADV_DONTNEED vs. numa balancing race	2017-12-16 10:33:50 +01:00
hugetlb_cgroup.c	mm: make compound_head() robust	2015-11-06 17:50:42 -08:00
hugetlb.c	mm, hugetlb: use pte_present() instead of pmd_present() in follow_huge_pmd()	2017-04-08 09:53:32 +02:00
hwpoison-inject.c
init-mm.c	mm: Add a user_ns owner to mm_struct and fix ptrace permission checks	2017-01-06 11:16:11 +01:00
internal.h	mm, mprotect: flush TLB if potentially racing with a parallel reclaim leaving stale TLB entries	2017-08-11 09:08:50 -07:00
interval_tree.c
Kconfig	mm: don't allow deferred pages with NEED_PER_CPU_KM	2018-05-26 08:48:55 +02:00
Kconfig.debug
kmemcheck.c
kmemleak-test.c
kmemleak.c	mm/kmemleak.c: wait for scan completion before disabling free	2018-05-30 07:49:06 +02:00
ksm.c	mm/ksm: fix interaction with THP	2018-05-30 07:49:08 +02:00
list_lru.c	mm/list_lru.c: fix list_lru_count_node() to be race free	2017-07-21 07:44:56 +02:00
maccess.c	mm/maccess.c: actually return -EFAULT from strncpy_from_unsafe	2015-11-05 19:34:48 -08:00
madvise.c	mm/madvise.c: fix madvise() infinite loop under special circumstances	2017-12-05 11:22:50 +01:00
Makefile
memblock.c	mm: consider memblock reservations for deferred memory initialization sizing	2017-06-14 13:16:26 +02:00
memcontrol.c	hwpoison, memcg: forcibly uncharge LRU pages	2018-01-31 12:06:09 +01:00
memory_hotplug.c	base/memory, hotplug: fix a kernel oops in show_valid_zones()	2017-02-09 08:02:47 +01:00
memory-failure.c	hwpoison, memcg: forcibly uncharge LRU pages	2018-01-31 12:06:09 +01:00
memory.c	mm: allow GFP_{FS,IO} for page_cache_read page cache allocation	2018-04-24 09:32:11 +02:00
mempolicy.c	mm/mempolicy.c: avoid use uninitialized preferred_node	2018-05-30 07:49:05 +02:00
mempool.c	mm/mempool: avoid KASAN marking mempool poison checks as use-after-free	2017-08-12 19:29:09 -07:00
memtest.c
migrate.c	Sanitize 'move_pages()' permission checks	2017-08-24 17:02:36 -07:00
mincore.c	mm/mincore: use offset_in_page macro	2015-11-05 19:34:48 -08:00
mlock.c	mlock: fix mlock count can not decrease in race condition	2017-06-07 12:06:01 +02:00
mm_init.c
mmap.c	mmap: relax file size limit for regular files	2018-06-13 16:15:27 +02:00
mmu_context.c	mm/mmu_context, sched/core: Fix mmu_context.h assumption	2017-12-25 14:22:09 +01:00
mmu_notifier.c
mmzone.c
mprotect.c	mm, mprotect: flush TLB if potentially racing with a parallel reclaim leaving stale TLB entries	2017-08-11 09:08:50 -07:00
mremap.c	mm, mprotect: flush TLB if potentially racing with a parallel reclaim leaving stale TLB entries	2017-08-11 09:08:50 -07:00
msync.c	mm/msync: use offset_in_page macro	2015-11-05 19:34:48 -08:00
nobootmem.c
nommu.c	mm/nommu.c: drop unlikely inside BUG_ON()	2015-11-05 19:34:48 -08:00
oom_kill.c	mm/oom_kill.c: avoid attempting to kill init sharing same memory	2015-12-12 10:15:34 -08:00
page_alloc.c	mm, page_alloc: fix potential false positive in __zone_watermark_ok	2018-01-31 12:06:09 +01:00
page_counter.c	mm: page_counter: let page_counter_try_charge() return bool	2015-11-05 19:34:48 -08:00
page_ext.c	mm/page_ext.c: check if page_ext is not prepared	2017-11-24 08:32:25 +01:00
page_idle.c
page_io.c
page_isolation.c	mm: fix invalid node in alloc_migrate_target()	2016-04-20 15:41:53 +09:00
page_owner.c	mm: check the return value of lookup_page_ext for all call sites	2017-11-24 08:32:25 +01:00
page-writeback.c	writeback: safer lock nesting	2018-04-24 09:32:12 +02:00
pagewalk.c	mm/pagewalk.c: report holes in hugetlb ranges	2017-11-24 08:32:25 +01:00
percpu-km.c
percpu-vm.c
percpu.c	percpu: include linux/sched.h for cond_resched()	2018-05-16 10:06:46 +02:00
pgtable-generic.c	mm,thp: khugepaged: call pte flush at the time of collapse	2016-02-25 12:01:23 -08:00
process_vm_access.c	ptrace: use fsuid, fsgid, effective creds for fs access checks	2016-02-25 12:01:16 -08:00
quicklist.c
readahead.c	mm, fs: introduce mapping_gfp_constraint()	2015-11-06 17:50:42 -08:00
rmap.c	mm/rmap: batched invalidations should use existing api	2017-12-25 14:22:09 +01:00
shmem.c	tmpfs: fix regression hang in fallocate undo	2016-07-27 09:47:40 -07:00
slab_common.c	slub: do not merge cache if slub_debug contains a never-merge flag	2017-10-21 17:09:05 +02:00
slab.c	mm, slab: reschedule cache_reap() on the same CPU	2018-04-24 09:32:05 +02:00
slab.h	slab/slub: adjust kmem_cache_alloc_bulk API	2015-11-22 11:58:44 -08:00
slob.c	slab/slub: adjust kmem_cache_alloc_bulk API	2015-11-22 11:58:44 -08:00
slub.c	slub/memcg: cure the brainless abuse of sysfs attributes	2017-06-07 12:06:01 +02:00
sparse-vmemmap.c
sparse.c
swap_cgroup.c	mm, swap_cgroup: reschedule when neeed in swap_cgroup_swapoff()	2017-07-05 14:37:15 +02:00
swap_state.c
swap.c	mm: make compound_head() robust	2015-11-06 17:50:42 -08:00
swapfile.c	swap: divide-by-zero when zero length swap file on ssd	2018-05-30 07:49:07 +02:00
truncate.c	fs: add i_blocksize()	2017-06-14 13:16:24 +02:00
userfaultfd.c
util.c	proc read mm's {arg,env}_{start,end} with mmap semaphore taken.	2018-05-26 08:48:55 +02:00
vmacache.c	mm/vmacache: inline vmacache_valid_mm()	2015-11-05 19:34:48 -08:00
vmalloc.c	mm: vmalloc: don't remove inexistent guard hole in remove_vm_area()	2015-11-20 16:17:32 -08:00
vmpressure.c	mm: vmpressure: fix sending wrong events on underflow	2017-03-12 06:37:25 +01:00
vmscan.c	mm: fix the NULL mapping case in __isolate_lru_page()	2018-06-06 16:46:23 +02:00
vmstat.c	proc: much faster /proc/vmstat	2018-01-10 09:27:14 +01:00
workingset.c	mm: workingset: fix crash in shadow node shrinker caused by replace_page_cache_page()	2016-10-28 03:01:34 -04:00
zbud.c	mm: zsmalloc: constify struct zs_pool name	2015-11-06 17:50:42 -08:00
zpool.c	mm: zsmalloc: constify struct zs_pool name	2015-11-06 17:50:42 -08:00
zsmalloc.c	zsmalloc: fix zs_can_compact() integer overflow	2016-05-18 17:06:44 -07:00
zswap.c	zswap: don't param_set_charp while holding spinlock	2018-01-17 09:35:27 +01:00