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vmalloc: back off when the current task is killed

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__vmalloc_area_node() allocates pages to cover the requested vmalloc
size.  This can be a lot of memory.  If the current task is killed by
the OOM killer, and thus has an unlimited access to memory reserves, it
can consume all the memory theoretically.  Fix this by checking for
fatal_signal_pending and back off early.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Michal Hocko <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Cc: Tetsuo Handa <[email protected]>
Cc: Al Viro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Michal Hocko authored and Linus Torvalds committed 2017-02-24 17:46:55 -08:00
1 parent dbe43d4d28
commit 5d17a73a2e
1 file changed
+5
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mm/vmalloc.c
+5
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@@ -1642,6 +1642,11 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
for (i = 0; i < area->nr_pages; i++) {
struct page *page;
if (fatal_signal_pending(current)) {
area->nr_pages = i;
goto fail;
}
if (node == NUMA_NO_NODE)
page = alloc_page(alloc_mask);
else