The patch titled
Subject: epoll: account epitem and eppoll_entry to kmemcg
has been added to the -mm tree. Its filename is
epoll-account-epitem-and-eppoll_entry-to-kmemcg.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/epoll-account-epitem-and-eppoll_entry-to-kmemcg.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/epoll-account-epitem-and-eppoll_entry-to-kmemcg.patch
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------------------------------------------------------
From: Shakeel Butt <shakeelb@xxxxxxxxxx>
Subject: epoll: account epitem and eppoll_entry to kmemcg
A userspace application can directly trigger the allocations from
eventpoll_epi and eventpoll_pwq slabs. A buggy or malicious application
can consume a significant amount of system memory by triggering such
allocations. Indeed we have seen in production where a buggy application
was leaking the epoll references and causing a burst of eventpoll_epi and
eventpoll_pwq slab allocations. This patch opt-in the charging of
eventpoll_epi and eventpoll_pwq slabs.
Link: http://lkml.kernel.org/r/20171003021519.23907-1-shakeelb@xxxxxxxxxx
Signed-off-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Greg Thelen <gthelen@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/eventpoll.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN fs/eventpoll.c~epoll-account-epitem-and-eppoll_entry-to-kmemcg fs/eventpoll.c
--- a/fs/eventpoll.c~epoll-account-epitem-and-eppoll_entry-to-kmemcg
+++ a/fs/eventpoll.c
@@ -2329,11 +2329,11 @@ static int __init eventpoll_init(void)
/* Allocates slab cache used to allocate "struct epitem" items */
epi_cache = kmem_cache_create("eventpoll_epi", sizeof(struct epitem),
- 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
+ 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_ACCOUNT, NULL);
/* Allocates slab cache used to allocate "struct eppoll_entry" */
pwq_cache = kmem_cache_create("eventpoll_pwq",
- sizeof(struct eppoll_entry), 0, SLAB_PANIC, NULL);
+ sizeof(struct eppoll_entry), 0, SLAB_PANIC|SLAB_ACCOUNT, NULL);
return 0;
}
_
Patches currently in -mm which might be from shakeelb@xxxxxxxxxx are
epoll-account-epitem-and-eppoll_entry-to-kmemcg.patch
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