From patchwork Sun Jan 10 17:33:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexey Gladkov X-Patchwork-Id: 12009331 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.7 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7C560C433DB for ; Sun, 10 Jan 2021 17:35:52 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id 9F32A221E5 for ; Sun, 10 Jan 2021 17:35:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9F32A221E5 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-20629-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 11674 invoked by uid 550); 10 Jan 2021 17:35:08 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Received: (qmail 11335 invoked from network); 10 Jan 2021 17:35:03 -0000 From: Alexey Gladkov To: LKML , Linux Containers , Kernel Hardening Cc: Alexey Gladkov , "Eric W . Biederman" , Kees Cook , Christian Brauner , Linus Torvalds Subject: [RFC PATCH v2 3/8] Increase size of ucounts to atomic_long_t Date: Sun, 10 Jan 2021 18:33:42 +0100 Message-Id: <2868ed8e8f196ae6ff4de60934668483680df14d.1610299857.git.gladkov.alexey@gmail.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.6.1 (raptor.unsafe.ru [5.9.43.93]); Sun, 10 Jan 2021 17:34:52 +0000 (UTC) This commit is preparation for migrating rlimits counters to ucounts. Signed-off-by: Alexey Gladkov --- include/linux/user_namespace.h | 4 ++-- kernel/ucount.c | 14 +++++++------- 2 files changed, 9 insertions(+), 9 deletions(-) diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h index 483568a56f7f..24b850c7b70e 100644 --- a/include/linux/user_namespace.h +++ b/include/linux/user_namespace.h @@ -85,7 +85,7 @@ struct user_namespace { struct ctl_table_header *sysctls; #endif struct ucounts *ucounts; - int ucount_max[UCOUNT_COUNTS]; + long ucount_max[UCOUNT_COUNTS]; } __randomize_layout; struct ucounts { @@ -93,7 +93,7 @@ struct ucounts { struct user_namespace *ns; kuid_t uid; atomic_t count; - atomic_t ucount[UCOUNT_COUNTS]; + atomic_long_t ucount[UCOUNT_COUNTS]; }; extern struct user_namespace init_user_ns; diff --git a/kernel/ucount.c b/kernel/ucount.c index 80a39073bcef..4c5825ffd2e9 100644 --- a/kernel/ucount.c +++ b/kernel/ucount.c @@ -185,14 +185,14 @@ void set_cred_ucounts(const struct cred *cred, struct user_namespace *ns, kuid_t ((struct cred *) cred)->ucounts = get_ucounts(ns, uid); } -static inline bool atomic_inc_below(atomic_t *v, int u) +static inline bool atomic_long_inc_below(atomic_long_t *v, int u) { - int c, old; - c = atomic_read(v); + long c, old; + c = atomic_long_read(v); for (;;) { if (unlikely(c >= u)) return false; - old = atomic_cmpxchg(v, c, c+1); + old = atomic_long_cmpxchg(v, c, c+1); if (likely(old == c)) return true; c = old; @@ -209,14 +209,14 @@ struct ucounts *inc_ucount(struct user_namespace *ns, kuid_t uid, int max; tns = iter->ns; max = READ_ONCE(tns->ucount_max[type]); - if (!atomic_inc_below(&iter->ucount[type], max)) + if (!atomic_long_inc_below(&iter->ucount[type], max)) goto fail; } return ucounts; fail: bad = iter; for (iter = ucounts; iter != bad; iter = iter->ns->ucounts) - atomic_dec(&iter->ucount[type]); + atomic_long_dec(&iter->ucount[type]); put_ucounts(ucounts); return NULL; @@ -226,7 +226,7 @@ void dec_ucount(struct ucounts *ucounts, enum ucount_type type) { struct ucounts *iter; for (iter = ucounts; iter; iter = iter->ns->ucounts) { - int dec = atomic_dec_if_positive(&iter->ucount[type]); + int dec = atomic_long_dec_if_positive(&iter->ucount[type]); WARN_ON_ONCE(dec < 0); } put_ucounts(ucounts);