diff mbox

[3/3] vmalloc: back of when the current is killed

Message ID 20170201092706.9966-4-mhocko@kernel.org (mailing list archive)
State New, archived
Headers show

Commit Message

Michal Hocko Feb. 1, 2017, 9:27 a.m. UTC 
From: Michal Hocko <mhocko@suse.com>

__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.

Signed-off-by: Michal Hocko <mhocko@suse.com>
---
 mm/vmalloc.c | 5 +++++
 1 file changed, 5 insertions(+)

Comments

Christoph Hellwig Feb. 1, 2017, 9:28 a.m. UTC | #1 
Looks fine,

Reviewed-by: Christoph Hellwig <hch@lst.de>
diff mbox

Patch

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