From patchwork Fri Dec 6 22:13:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11277071 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 71764930 for ; Fri, 6 Dec 2019 22:14:59 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id A100724673 for ; Fri, 6 Dec 2019 22:14:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="nleTFJgR" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A100724673 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-17478-patchwork-kernel-hardening=patchwork.kernel.org@lists.openwall.com Received: (qmail 19926 invoked by uid 550); 6 Dec 2019 22:14:24 -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: Delivered-To: mailing list kernel-hardening@lists.openwall.com Received: (qmail 19832 invoked from network); 6 Dec 2019 22:14:23 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=2NAd6y4qah1xjfOWgEwpdzIyhOs1qjeDK6sFpv82Xfk=; b=nleTFJgRsrFntSKtaTSiELZAJh4L62n5MZ39M4LNipLMCXmGAfN+QbNLE9JWVDNoUf FZeGDFV2R/AF33xnTgrIX5xjnCWJVFZRyTk8S+GG2mohQlZMLcvRe2iURNjMn+aIN/og bfwgPaN9/saum6UK50jtpf3YpT9BXijJTmvlKEOOPFgAq6IT8xd+3XqS/piglnxvV3Lg HDplbyhHrPdi/L4Hy1988EmrJKJabf6LPGSLYuq3BG/Dr7HeGQfO2fyQJqMplXbKLnV4 mPGbF+SAnjxCad9nRgJLhDQm4R3cVNWjefLoFKhefXmz+/SdA+LcVY17pkNRUdnrDniD O7fA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=2NAd6y4qah1xjfOWgEwpdzIyhOs1qjeDK6sFpv82Xfk=; b=lzfloPYs1zrUgUKYdCCSvU3LKzi1o17+cGb98kmsvg8HTxdnDbu5TatKRbtU3Jv8v4 Aa9Dl0OSMYXdfyQMNVO8LArdxH66Bm4ljOlOlArhW+6Np3vlBJs1kckUTPMrT1h4wfWk OwQn3wYaFCZQhwSSWP0+S+PyD8ojoGTe1CLfXXpyF83kBamyFmalXIK/ESgOq/ta3mNI Sf8rYd95M6UHgZY09o5hwzuiv0BrRT/OQHS8F+nYTlybGeFtdEbXv0Bz8se5tNxGMWfa lo4JUSqqmbErWr0TfLdK4kZpL636KYufmWPbWNjM6OVbToBUht8OM2hJvD5J4T8ke5cY U3mA== X-Gm-Message-State: APjAAAWMffNWtUWyckvtIQWVAOBQOSbvjyrgdClTVGWE6RP/GrSoMGUT lQjo/ojkTzTBJzQA31yXiabonrMb3GaFI+T2+qo= X-Google-Smtp-Source: APXvYqwPxKr5F59QI/IUrMyssHf1PoCaUN+YE2r4dert42cYlVgcHlWDeG9U9dYm6ovwVN+Ig08oGuZ7xRI0KQJlkmM= X-Received: by 2002:a65:64d0:: with SMTP id t16mr6176894pgv.427.1575670451581; Fri, 06 Dec 2019 14:14:11 -0800 (PST) Date: Fri, 6 Dec 2019 14:13:42 -0800 In-Reply-To: <20191206221351.38241-1-samitolvanen@google.com> Message-Id: <20191206221351.38241-7-samitolvanen@google.com> Mime-Version: 1.0 References: <20191018161033.261971-1-samitolvanen@google.com> <20191206221351.38241-1-samitolvanen@google.com> X-Mailer: git-send-email 2.24.0.393.g34dc348eaf-goog Subject: [PATCH v6 06/15] scs: add accounting From: Sami Tolvanen To: Will Deacon , Catalin Marinas , Steven Rostedt , Masami Hiramatsu , Ard Biesheuvel , Mark Rutland Cc: Dave Martin , Kees Cook , Laura Abbott , Marc Zyngier , Nick Desaulniers , Jann Horn , Miguel Ojeda , Masahiro Yamada , clang-built-linux@googlegroups.com, kernel-hardening@lists.openwall.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Sami Tolvanen This change adds accounting for the memory allocated for shadow stacks. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- drivers/base/node.c | 6 ++++++ fs/proc/meminfo.c | 4 ++++ include/linux/mmzone.h | 3 +++ kernel/scs.c | 20 ++++++++++++++++++++ mm/page_alloc.c | 6 ++++++ mm/vmstat.c | 3 +++ 6 files changed, 42 insertions(+) diff --git a/drivers/base/node.c b/drivers/base/node.c index 98a31bafc8a2..874a8b428438 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -415,6 +415,9 @@ static ssize_t node_read_meminfo(struct device *dev, "Node %d AnonPages: %8lu kB\n" "Node %d Shmem: %8lu kB\n" "Node %d KernelStack: %8lu kB\n" +#ifdef CONFIG_SHADOW_CALL_STACK + "Node %d ShadowCallStack:%8lu kB\n" +#endif "Node %d PageTables: %8lu kB\n" "Node %d NFS_Unstable: %8lu kB\n" "Node %d Bounce: %8lu kB\n" @@ -438,6 +441,9 @@ static ssize_t node_read_meminfo(struct device *dev, nid, K(node_page_state(pgdat, NR_ANON_MAPPED)), nid, K(i.sharedram), nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK_KB), +#ifdef CONFIG_SHADOW_CALL_STACK + nid, sum_zone_node_page_state(nid, NR_KERNEL_SCS_BYTES) / 1024, +#endif nid, K(sum_zone_node_page_state(nid, NR_PAGETABLE)), nid, K(node_page_state(pgdat, NR_UNSTABLE_NFS)), nid, K(sum_zone_node_page_state(nid, NR_BOUNCE)), diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c index 8c1f1bb1a5ce..49768005a79e 100644 --- a/fs/proc/meminfo.c +++ b/fs/proc/meminfo.c @@ -103,6 +103,10 @@ static int meminfo_proc_show(struct seq_file *m, void *v) show_val_kb(m, "SUnreclaim: ", sunreclaim); seq_printf(m, "KernelStack: %8lu kB\n", global_zone_page_state(NR_KERNEL_STACK_KB)); +#ifdef CONFIG_SHADOW_CALL_STACK + seq_printf(m, "ShadowCallStack:%8lu kB\n", + global_zone_page_state(NR_KERNEL_SCS_BYTES) / 1024); +#endif show_val_kb(m, "PageTables: ", global_zone_page_state(NR_PAGETABLE)); diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 89d8ff06c9ce..dfeb8a5a7f7e 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -200,6 +200,9 @@ enum zone_stat_item { NR_MLOCK, /* mlock()ed pages found and moved off LRU */ NR_PAGETABLE, /* used for pagetables */ NR_KERNEL_STACK_KB, /* measured in KiB */ +#if IS_ENABLED(CONFIG_SHADOW_CALL_STACK) + NR_KERNEL_SCS_BYTES, /* measured in bytes */ +#endif /* Second 128 byte cacheline */ NR_BOUNCE, #if IS_ENABLED(CONFIG_ZSMALLOC) diff --git a/kernel/scs.c b/kernel/scs.c index 28abed21950c..5245e992c692 100644 --- a/kernel/scs.c +++ b/kernel/scs.c @@ -12,6 +12,7 @@ #include #include #include +#include #include static inline void *__scs_base(struct task_struct *tsk) @@ -89,6 +90,11 @@ static void scs_free(void *s) vfree_atomic(s); } +static struct page *__scs_page(struct task_struct *tsk) +{ + return vmalloc_to_page(__scs_base(tsk)); +} + static int scs_cleanup(unsigned int cpu) { int i; @@ -135,6 +141,11 @@ static inline void scs_free(void *s) kmem_cache_free(scs_cache, s); } +static struct page *__scs_page(struct task_struct *tsk) +{ + return virt_to_page(__scs_base(tsk)); +} + void __init scs_init(void) { scs_cache = kmem_cache_create("scs_cache", SCS_SIZE, SCS_SIZE, @@ -153,6 +164,12 @@ void scs_task_reset(struct task_struct *tsk) task_set_scs(tsk, __scs_base(tsk)); } +static void scs_account(struct task_struct *tsk, int account) +{ + mod_zone_page_state(page_zone(__scs_page(tsk)), NR_KERNEL_SCS_BYTES, + account * SCS_SIZE); +} + int scs_prepare(struct task_struct *tsk, int node) { void *s; @@ -162,6 +179,8 @@ int scs_prepare(struct task_struct *tsk, int node) return -ENOMEM; task_set_scs(tsk, s); + scs_account(tsk, 1); + return 0; } @@ -182,6 +201,7 @@ void scs_release(struct task_struct *tsk) WARN_ON(scs_corrupted(tsk)); + scs_account(tsk, -1); task_set_scs(tsk, NULL); scs_free(s); } diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 4785a8a2040e..6073556fc99a 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5365,6 +5365,9 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask) " managed:%lukB" " mlocked:%lukB" " kernel_stack:%lukB" +#ifdef CONFIG_SHADOW_CALL_STACK + " shadow_call_stack:%lukB" +#endif " pagetables:%lukB" " bounce:%lukB" " free_pcp:%lukB" @@ -5387,6 +5390,9 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask) K(zone_managed_pages(zone)), K(zone_page_state(zone, NR_MLOCK)), zone_page_state(zone, NR_KERNEL_STACK_KB), +#ifdef CONFIG_SHADOW_CALL_STACK + zone_page_state(zone, NR_KERNEL_SCS_BYTES) / 1024, +#endif K(zone_page_state(zone, NR_PAGETABLE)), K(zone_page_state(zone, NR_BOUNCE)), K(free_pcp), diff --git a/mm/vmstat.c b/mm/vmstat.c index 78d53378db99..d0650391c8c1 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1119,6 +1119,9 @@ const char * const vmstat_text[] = { "nr_mlock", "nr_page_table_pages", "nr_kernel_stack", +#if IS_ENABLED(CONFIG_SHADOW_CALL_STACK) + "nr_shadow_call_stack_bytes", +#endif "nr_bounce", #if IS_ENABLED(CONFIG_ZSMALLOC) "nr_zspages",