From 5d17a73a2ebeb8d1c6924b91e53ab2650fe86ffb Mon Sep 17 00:00:00 2001 From: Michal Hocko Date: Fri, 24 Feb 2017 14:58:53 -0800 Subject: [PATCH] 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 Reviewed-by: Christoph Hellwig Cc: Tetsuo Handa Cc: Al Viro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/vmalloc.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index d89034a393f2..011b446f8758 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -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 -- 2.20.1