Jan Kara 07d6db9281 mm: make sendfile(2) killable ... commit 296291cdd1629c308114504b850dc343eabc2782 upstream. Currently a simple program below issues a sendfile(2) system call which takes about 62 days to complete in my test KVM instance. int fd; off_t off = 0; fd = open("file", O_RDWR | O_TRUNC | O_SYNC | O_CREAT, 0644); ftruncate(fd, 2); lseek(fd, 0, SEEK_END); sendfile(fd, fd, &off, 0xfffffff); Now you should not ask kernel to do a stupid stuff like copying 256MB in 2-byte chunks and call fsync(2) after each chunk but if you do, sysadmin should have a way to stop you. We actually do have a check for fatal_signal_pending() in generic_perform_write() which triggers in this path however because we always succeed in writing something before the check is done, we return value > 0 from generic_perform_write() and thus the information about signal gets lost. Fix the problem by doing the signal check before writing anything. That way generic_perform_write() returns -EINTR, the error gets propagated up and the sendfile loop terminates early. Signed-off-by: Jan Kara <jack@suse.com> Reported-by: Dmitry Vyukov <dvyukov@google.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2015-11-09 10:12:58 -08:00
..
Kconfig	mmKconfig: add an option to disable bounce	2013-04-29 15:54:40 -07:00
Kconfig.debug	…
Makefile	memcg: add memory.pressure_level events	2013-04-29 15:54:38 -07:00
backing-dev.c	bdi: avoid oops on device removal	2014-04-26 17:15:35 -07:00
balloon_compaction.c	…
bootmem.c	…
bounce.c	mm/bounce.c: fix a regression where MS_SNAP_STABLE (stable pages snapshotting) was ignored	2013-10-13 16:08:33 -07:00
cleancache.c	mm: cleancache: clean up cleancache_enabled	2013-04-30 17:04:01 -07:00
compaction.c	mm/compaction: fix wrong order check in compact_finished()	2015-03-18 13:22:28 +01:00
debug-pagealloc.c	…
dmapool.c	…
fadvise.c	…
failslab.c	…
filemap.c	mm: make sendfile(2) killable	2015-11-09 10:12:58 -08:00
filemap_xip.c	…
fremap.c	mm: fix use-after-free in sys_remap_file_pages	2014-01-09 12:24:24 -08:00
frontswap.c	mm: frontswap: invalidate expired data on a dup-store failure	2014-12-16 09:09:41 -08:00
highmem.c	…
huge_memory.c	mm: numa: Do not mark PTEs pte_numa when splitting huge pages	2014-10-09 12:18:42 -07:00
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	…
init-mm.c	…
internal.h	…
interval_tree.c	…
kmemcheck.c	…
kmemleak-test.c	…
kmemleak.c	…
ksm.c	vm: add VM_FAULT_SIGSEGV handling support	2015-04-29 10:34:00 +02:00
maccess.c	…
madvise.c	mm: madvise: complete input validation before taking lock	2013-04-29 15:54:37 -07:00
memblock.c	memblock: fix missing comment of memblock_insert_region()	2013-04-29 15:54:38 -07:00
memcontrol.c	mm: memcg: handle non-error OOM situations more gracefully	2014-11-21 09:22:56 -08:00
memory-failure.c	mm/hwpoison: fix page refcount of unknown non LRU page	2015-09-13 09:07:59 -07:00
memory.c	mm: avoid setting up anonymous pages into file mapping	2015-08-10 12:20:29 -07:00
memory_hotplug.c	mm/memory_hotplug.c: set zone->wait_table to null after freeing it	2015-06-22 16:55:54 -07:00
mempolicy.c	cpuset,mempolicy: fix sleeping function called from invalid context	2014-07-17 15:58:00 -07:00
mempool.c	…
migrate.c	mm: numa: avoid unnecessary work on the failure path	2014-01-09 12:24:23 -08:00
mincore.c	…
mlock.c	mm: try_to_unmap_cluster() should lock_page() before mlocking	2014-05-06 07:55:32 -07:00
mm_init.c	…
mmap.c	mm/mmap.c: fix arithmetic overflow in __vm_enough_memory()	2015-03-18 13:22:27 +01:00
mmu_context.c	mm: remove old aio use_mm() comment	2013-05-07 18:38:27 -07:00
mmu_notifier.c	mm: mmu_notifier: re-fix freed page still mapped in secondary MMU	2013-05-24 16:22:51 -07:00
mmzone.c	…
mprotect.c	mm: fix TLB flush race between migration, and change_protection_range	2014-01-09 12:24:23 -08:00
mremap.c	mm, thp: close race between mremap() and split_huge_page()	2014-06-07 13:25:31 -07:00
msync.c	…
nobootmem.c	mm, nobootmem: do memset() after memblock_reserve()	2013-04-29 15:54:39 -07:00
nommu.c	mm/nommu.c: fix arithmetic overflow in __vm_enough_memory()	2015-03-18 13:22:28 +01:00
oom_kill.c	mm: memcg: handle non-error OOM situations more gracefully	2014-11-21 09:22:56 -08:00
page-writeback.c	writeback: fix possible underflow in write bandwidth calculation	2015-04-19 10:10:48 +02:00
page_alloc.c	OOM, PM: OOM killed task shouldn't escape PM suspend	2014-11-14 08:47:58 -08:00
page_cgroup.c	cgroup/kmemleak: add kmemleak_free() for cgroup deallocations.	2014-11-14 08:47:59 -08:00
page_io.c	Merge branch 'for-3.10/core' of git://git.kernel.dk/linux-block	2013-05-08 10:13:35 -07:00
page_isolation.c	…
pagewalk.c	mm: pagewalk: call pte_hole() for VM_PFNMAP during walk_page_range	2015-02-11 14:48:16 +08:00
percpu-km.c	…
percpu-vm.c	percpu: perform tlb flush after pcpu_map_pages() failure	2014-10-05 14:54:13 -07:00
percpu.c	Revert "percpu: free percpu allocation info for uniprocessor system"	2014-11-14 08:47:53 -08:00
pgtable-generic.c	mm: fix TLB flush race between migration, and change_protection_range	2014-01-09 12:24:23 -08:00
process_vm_access.c	…
quicklist.c	…
readahead.c	…
rmap.c	mm: fix sleeping function warning from __put_anon_vma	2014-06-30 20:09:42 -07:00
shmem.c	shmem: fix nlink for rename overwrite directory	2014-10-05 14:54:11 -07:00
slab.c	slab: fix init_lock_keys	2013-07-21 18:21:26 -07:00
slab.h	memcg: check that kmem_cache has memcg_params before accessing it	2013-09-07 22:09:58 -07:00
slab_common.c	slab_common: fix the check for duplicate slab names	2014-07-31 12:53:50 -07:00
slob.c	…
slub.c	slub: Fix calculation of cpu slabs	2014-02-13 13:48:00 -08:00
sparse-vmemmap.c	sparse-vmemmap: specify vmemmap population range in bytes	2013-04-29 15:54:35 -07:00
sparse.c	mm, hotplug: avoid compiling memory hotremove functions when disabled	2013-04-29 15:54:37 -07:00
swap.c	mm: close PageTail race	2014-04-03 12:01:05 -07:00
swap_state.c	swap: avoid read_swap_cache_async() race to deadlock while waiting on discard I/O completion	2013-06-12 16:29:45 -07:00
swapfile.c	frontswap: fix incorrect zeroing and allocation size for frontswap_map	2013-06-12 16:29:46 -07:00
truncate.c	mm: Remove false WARN_ON from pagecache_isize_extended()	2014-11-14 08:48:00 -08:00
util.c	vm_is_stack: use for_each_thread() rather then buggy while_each_thread()	2014-10-05 14:54:16 -07:00
vmalloc.c	mm/vmalloc.c: fix an overflow bug in alloc_vmap_area()	2013-11-13 12:05:34 +09:00
vmpressure.c	memcg: add memory.pressure_level events	2013-04-29 15:54:38 -07:00
vmscan.c	vmscan: fix increasing nr_isolated incurred by putback unevictable pages	2015-10-01 12:07:32 +02:00
vmstat.c	mm: numa: return the number of base pages altered by protection changes	2013-12-08 07:29:27 -08:00