The patch titled
Subject: mm, fs: check for fatal signals in do_generic_file_read()
has been added to the -mm tree. Its filename is
mm-fs-check-for-fatal-signals-in-do_generic_file_read.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-fs-check-for-fatal-signals-in-do_generic_file_read.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-fs-check-for-fatal-signals-in-do_generic_file_read.patch
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------------------------------------------------------
From: Michal Hocko <mhocko@xxxxxxxx>
Subject: mm, fs: check for fatal signals in do_generic_file_read()
do_generic_file_read() can be told to perform a large request from
userspace. If the system is under OOM and the reading task is the OOM
victim then it has an access to memory reserves and finishing the full
request can lead to the full memory depletion which is dangerous. Make
sure we rather go with a short read and allow the killed task to
terminate.
Link: http://lkml.kernel.org/r/20170201092706.9966-3-mhocko@xxxxxxxxxx
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/filemap.c | 5 +++++
1 file changed, 5 insertions(+)
diff -puN mm/filemap.c~mm-fs-check-for-fatal-signals-in-do_generic_file_read mm/filemap.c
--- a/mm/filemap.c~mm-fs-check-for-fatal-signals-in-do_generic_file_read
+++ a/mm/filemap.c
@@ -1791,6 +1791,11 @@ static ssize_t do_generic_file_read(stru
cond_resched();
find_page:
+ if (fatal_signal_pending(current)) {
+ error = -EINTR;
+ goto out;
+ }
+
page = find_get_page(mapping, index);
if (!page) {
page_cache_sync_readahead(mapping,
_
Patches currently in -mm which might be from mhocko@xxxxxxxx are
fs-break-out-of-iomap_file_buffered_write-on-fatal-signals.patch
mm-fs-check-for-fatal-signals-in-do_generic_file_read.patch
mm-throttle-show_mem-from-warn_alloc.patch
mm-trace-extract-compaction_status-and-zone_type-to-a-common-header.patch
oom-trace-add-oom-detection-tracepoints.patch
oom-trace-add-compaction-retry-tracepoint.patch
mm-vmscan-remove-unused-mm_vmscan_memcg_isolate.patch
mm-vmscan-add-active-list-aging-tracepoint.patch
mm-vmscan-add-active-list-aging-tracepoint-update.patch
mm-vmscan-show-the-number-of-skipped-pages-in-mm_vmscan_lru_isolate.patch
mm-vmscan-show-lru-name-in-mm_vmscan_lru_isolate-tracepoint.patch
mm-vmscan-extract-shrink_page_list-reclaim-counters-into-a-struct.patch
mm-vmscan-enhance-mm_vmscan_lru_shrink_inactive-tracepoint.patch
mm-vmscan-add-mm_vmscan_inactive_list_is_low-tracepoint.patch
trace-vmscan-postprocess-sync-with-tracepoints-updates.patch
mm-vmscan-do-not-count-freed-pages-as-pgdeactivate.patch
mm-vmscan-cleanup-lru-size-claculations.patch
mm-vmscan-consider-eligible-zones-in-get_scan_count.patch
revert-mm-bail-out-in-shrink_inactive_list.patch
mm-page_alloc-do-not-report-all-nodes-in-show_mem.patch
mm-page_alloc-warn_alloc-print-nodemask.patch
arch-mm-remove-arch-specific-show_mem.patch
lib-show_memc-teach-show_mem-to-work-with-the-given-nodemask.patch
mm-consolidate-gfp_nofail-checks-in-the-allocator-slowpath.patch
mm-oom-do-not-enfore-oom-killer-for-__gfp_nofail-automatically.patch
mm-help-__gfp_nofail-allocations-which-do-not-trigger-oom-killer.patch
vmalloc-back-of-when-the-current-is-killed.patch
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