The patch titled
oom: stop allocating user memory if TIF_MEMDIE is set
has been added to the -mm tree. Its filename is
oom-stop-allocating-user-memory-if-tif_memdie-is-set.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: oom: stop allocating user memory if TIF_MEMDIE is set
From: Ethan Solomita <solo@xxxxxxxxxx>
get_user_pages() can try to allocate a nearly unlimited amount of memory on
behalf of a user process, even if that process has been OOM killed. The
OOM kill occurs upon return to user space via a SIGKILL, but
get_user_pages() will try allocate all its memory before returning. Change
get_user_pages() to check for TIF_MEMDIE, and if set then return
immediately.
Signed-off-by: Ethan Solomita <solo@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 8 ++++++++
1 files changed, 8 insertions(+)
diff -puN mm/memory.c~oom-stop-allocating-user-memory-if-tif_memdie-is-set mm/memory.c
--- a/mm/memory.c~oom-stop-allocating-user-memory-if-tif_memdie-is-set
+++ a/mm/memory.c
@@ -1056,6 +1056,14 @@ int get_user_pages(struct task_struct *t
do {
struct page *page;
+ /*
+ * If tsk is ooming, cut off its access to large memory
+ * allocations. It has a pending SIGKILL, but it can't
+ * be processed until returning to user space.
+ */
+ if (unlikely(test_tsk_thread_flag(tsk, TIF_MEMDIE)))
+ return -ENOMEM;
+
if (write)
foll_flags |= FOLL_WRITE;
_
Patches currently in -mm which might be from solo@xxxxxxxxxx are
oom-stop-allocating-user-memory-if-tif_memdie-is-set.patch
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