From: Vasily Averin vvs@virtuozzo.com
mainline inclusion from mainline-v5.15-rc1 commit 5f58c39819ff78ca5ddbba2b3cd8ff4779b19bb5 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I4A0WD CVE: NA
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When a user send a signal to any another processes it forces the kernel to allocate memory for 'struct sigqueue' objects. The number of signals is limited by RLIMIT_SIGPENDING resource limit, but even the default settings allow each user to consume up to several megabytes of memory.
It makes sense to account for these allocations to restrict the host's memory consumption from inside the memcg-limited container.
Link: https://lkml.kernel.org/r/e34e958c-e785-712e-a62a-2c7b66c646c7@virtuozzo.com Signed-off-by: Vasily Averin vvs@virtuozzo.com Reviewed-by: Shakeel Butt shakeelb@google.com Cc: Alexander Viro viro@zeniv.linux.org.uk Cc: Alexey Dobriyan adobriyan@gmail.com Cc: Andrei Vagin avagin@gmail.com Cc: Borislav Petkov bp@alien8.de Cc: Borislav Petkov bp@suse.de Cc: Christian Brauner christian.brauner@ubuntu.com Cc: Dmitry Safonov 0x7f454c46@gmail.com Cc: "Eric W. Biederman" ebiederm@xmission.com Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: "H. Peter Anvin" hpa@zytor.com Cc: Ingo Molnar mingo@redhat.com Cc: "J. Bruce Fields" bfields@fieldses.org Cc: Jeff Layton jlayton@kernel.org Cc: Jens Axboe axboe@kernel.dk Cc: Jiri Slaby jirislaby@kernel.org Cc: Johannes Weiner hannes@cmpxchg.org Cc: Kirill Tkhai ktkhai@virtuozzo.com Cc: Michal Hocko mhocko@kernel.org Cc: Oleg Nesterov oleg@redhat.com Cc: Roman Gushchin guro@fb.com Cc: Serge Hallyn serge@hallyn.com Cc: Tejun Heo tj@kernel.org Cc: Thomas Gleixner tglx@linutronix.de Cc: Vladimir Davydov vdavydov.dev@gmail.com Cc: Yutian Yang nglaive@gmail.com Cc: Zefan Li lizefan.x@bytedance.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org
Conflicts: kernel/signal.c Signed-off-by: Li Ming limingming.li@huawei.com
Signed-off-by: Lu Jialin lujialin4@huawei.com Reviewed-by: Xiu Jianfeng xiujianfeng@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- kernel/signal.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/signal.c b/kernel/signal.c index a39ca8841c8fa..89f1bd9c008a2 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -4051,7 +4051,7 @@ void __init signals_init(void) != offsetof(struct siginfo, _sifields._pad)); BUILD_BUG_ON(sizeof(struct siginfo) != SI_MAX_SIZE);
- sigqueue_cachep = KMEM_CACHE(sigqueue, SLAB_PANIC); + sigqueue_cachep = KMEM_CACHE(sigqueue, SLAB_PANIC | SLAB_ACCOUNT); }
#ifdef CONFIG_KGDB_KDB