Commit 5d17a73a authored Feb 24, 2017 by Michal Hocko Committed by Linus Torvalds Feb 24, 2017

vmalloc: back off when the current task is killed

__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/20170201092706.9966-4-mhocko@kernel.org


Signed-off-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
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>

parent dbe43d4d

mm/vmalloc.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -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

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