From patchwork Mon Sep 19 17:24:16 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Akinobu Mita X-Patchwork-Id: 12980822 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A36B7ECAAD3 for ; Mon, 19 Sep 2022 17:25:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230124AbiISRY6 (ORCPT ); Mon, 19 Sep 2022 13:24:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58070 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230209AbiISRY4 (ORCPT ); Mon, 19 Sep 2022 13:24:56 -0400 Received: from mail-pg1-x531.google.com (mail-pg1-x531.google.com [IPv6:2607:f8b0:4864:20::531]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 033C912741; Mon, 19 Sep 2022 10:24:55 -0700 (PDT) Received: by mail-pg1-x531.google.com with SMTP id q9so18235389pgq.8; Mon, 19 Sep 2022 10:24:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date; bh=dm/xj3UCM5GDvqsqEmDruuZjxjQYqmvO/RJqSynJbxs=; b=Gl7e0Yg8ZgFENkMxqlZEodWfUspPOUzXA6vlgpyAT3PfrxXQj5hHyjBXcOEztaOxX4 Cit0Qg+NsaiJdZzLZeDbyx+dco7v0P1bMKAkFi7i5QYrOPC60VSzMUSJ0blRa5Y7I333 BgCxp/EKma8OPzoa0oz/JFpLSbSggbELy21Kzyg8/PabTrvZ2SXGuWb8vpHEbZMSOswd DkmGSS+NjD9cVPrK/i2CnS1/MOoI8DigrnVgC6EFYnR1Yi8MTEsNZN7DqGmH5OibfzW+ EOIO7EPrnROJDtqPZvzmqKnXDdC18pi31j2HFmF499FCJTH/eEspslCg7QWyejU6JmZH gbkw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date; bh=dm/xj3UCM5GDvqsqEmDruuZjxjQYqmvO/RJqSynJbxs=; b=ooqGRp+q5IkCEcTu0FvpPiSW40RlUo/7oIwKGFKLqQoAq0u0BZwD/5ZlS3CJfLXdJi mmhTJWq2LelQTr088JHclsMCATe+jHzSM7PnN9NdShlNC4tokY01FNcmPwn+xvGU+fCL Rc6n2hucBL0RbzLdu11JUvZmW3udSrUQVH6xagTZZg1bbDrGLAbM5K04WNC34QXq3y/M Ve01PRxEgPEMZjssm8yJK6HdAURbX+mIquFwXk8/V0ZqtwfLdV/O1mrUmsCiz92he6Yi KAfQ7QIMwMMvqxza7nWrXVMhZMX6dCF1mjbLjRx3T4SVGOArbY5MrC5pS+q4fYeYSqS6 nXpQ== X-Gm-Message-State: ACrzQf3FiqLvFKFJR5a+Dtq3E9+QUkoXR/fNTQy6kEo3TGZTw0lX80Eb kmGHG4bLA6qoWbi6BtfX14hZsJsMHLA= X-Google-Smtp-Source: AMsMyM77MWJIoSfL+bJOQIrJOo1UxqGAj8MBR0N1o9UjBpDSOUGMPeEtRSXnUeklW0hsy/M0CYwu2A== X-Received: by 2002:a63:c3:0:b0:439:72d7:7e1f with SMTP id 186-20020a6300c3000000b0043972d77e1fmr16248074pga.524.1663608294102; Mon, 19 Sep 2022 10:24:54 -0700 (PDT) Received: from localhost.localdomain (KD027092233113.ppp-bb.dion.ne.jp. [27.92.233.113]) by smtp.gmail.com with ESMTPSA id h7-20020aa796c7000000b0053f2505318asm21226480pfq.142.2022.09.19.10.24.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Sep 2022 10:24:53 -0700 (PDT) From: Akinobu Mita To: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-fsdevel@vger.kernel.org, corbet@lwn.net, david@redhat.com, osalvador@suse.de, shuah@kernel.org, Zhao Gongyi , Wei Yongjun , Yicong Yang , Greg Kroah-Hartman , "Rafael J. Wysocki" , Alexander Viro , akpm@linux-foundation.org Cc: Akinobu Mita Subject: [PATCH 1/3] libfs: add DEFINE_SIMPLE_ATTRIBUTE_SIGNED for signed value Date: Tue, 20 Sep 2022 02:24:16 +0900 Message-Id: <20220919172418.45257-2-akinobu.mita@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220919172418.45257-1-akinobu.mita@gmail.com> References: <20220919172418.45257-1-akinobu.mita@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org The simple attribute files do not accept a negative value since the commit 488dac0c9237 ("libfs: fix error cast of negative value in simple_attr_write()"), so we have to use a 64-bit value to write a negative value. This adds DEFINE_SIMPLE_ATTRIBUTE_SIGNED for a signed value. Fixes: 488dac0c9237 ("libfs: fix error cast of negative value in simple_attr_write()") Reported-by: Zhao Gongyi Signed-off-by: Akinobu Mita Reviewed-by: David Hildenbrand --- fs/libfs.c | 22 +++++++++++++++++++--- include/linux/fs.h | 12 ++++++++++-- 2 files changed, 29 insertions(+), 5 deletions(-) diff --git a/fs/libfs.c b/fs/libfs.c index 31b0ddf01c31..76fb29a103a2 100644 --- a/fs/libfs.c +++ b/fs/libfs.c @@ -994,8 +994,8 @@ ssize_t simple_attr_read(struct file *file, char __user *buf, EXPORT_SYMBOL_GPL(simple_attr_read); /* interpret the buffer as a number to call the set function with */ -ssize_t simple_attr_write(struct file *file, const char __user *buf, - size_t len, loff_t *ppos) +static ssize_t simple_attr_write_xsigned(struct file *file, const char __user *buf, + size_t len, loff_t *ppos, bool is_signed) { struct simple_attr *attr; unsigned long long val; @@ -1016,7 +1016,10 @@ ssize_t simple_attr_write(struct file *file, const char __user *buf, goto out; attr->set_buf[size] = '\0'; - ret = kstrtoull(attr->set_buf, 0, &val); + if (is_signed) + ret = kstrtoll(attr->set_buf, 0, &val); + else + ret = kstrtoull(attr->set_buf, 0, &val); if (ret) goto out; ret = attr->set(attr->data, val); @@ -1026,8 +1029,21 @@ ssize_t simple_attr_write(struct file *file, const char __user *buf, mutex_unlock(&attr->mutex); return ret; } + +ssize_t simple_attr_write(struct file *file, const char __user *buf, + size_t len, loff_t *ppos) +{ + return simple_attr_write_xsigned(file, buf, len, ppos, false); +} EXPORT_SYMBOL_GPL(simple_attr_write); +ssize_t simple_attr_write_signed(struct file *file, const char __user *buf, + size_t len, loff_t *ppos) +{ + return simple_attr_write_xsigned(file, buf, len, ppos, true); +} +EXPORT_SYMBOL_GPL(simple_attr_write_signed); + /** * generic_fh_to_dentry - generic helper for the fh_to_dentry export operation * @sb: filesystem to do the file handle conversion on diff --git a/include/linux/fs.h b/include/linux/fs.h index 9eced4cc286e..c79138818922 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3471,7 +3471,7 @@ void simple_transaction_set(struct file *file, size_t n); * All attributes contain a text representation of a numeric value * that are accessed with the get() and set() functions. */ -#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ +#define DEFINE_SIMPLE_ATTRIBUTE_XSIGNED(__fops, __get, __set, __fmt, __is_signed) \ static int __fops ## _open(struct inode *inode, struct file *file) \ { \ __simple_attr_check_format(__fmt, 0ull); \ @@ -3482,10 +3482,16 @@ static const struct file_operations __fops = { \ .open = __fops ## _open, \ .release = simple_attr_release, \ .read = simple_attr_read, \ - .write = simple_attr_write, \ + .write = (__is_signed) ? simple_attr_write_signed : simple_attr_write, \ .llseek = generic_file_llseek, \ } +#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ + DEFINE_SIMPLE_ATTRIBUTE_XSIGNED(__fops, __get, __set, __fmt, false) + +#define DEFINE_SIMPLE_ATTRIBUTE_SIGNED(__fops, __get, __set, __fmt) \ + DEFINE_SIMPLE_ATTRIBUTE_XSIGNED(__fops, __get, __set, __fmt, true) + static inline __printf(1, 2) void __simple_attr_check_format(const char *fmt, ...) { @@ -3500,6 +3506,8 @@ ssize_t simple_attr_read(struct file *file, char __user *buf, size_t len, loff_t *ppos); ssize_t simple_attr_write(struct file *file, const char __user *buf, size_t len, loff_t *ppos); +ssize_t simple_attr_write_signed(struct file *file, const char __user *buf, + size_t len, loff_t *ppos); struct ctl_table; int __init list_bdev_fs_names(char *buf, size_t size); From patchwork Mon Sep 19 17:24:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Akinobu Mita X-Patchwork-Id: 12980823 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 94445C54EE9 for ; Mon, 19 Sep 2022 17:25:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231230AbiISRZM (ORCPT ); Mon, 19 Sep 2022 13:25:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58286 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231138AbiISRY7 (ORCPT ); Mon, 19 Sep 2022 13:24:59 -0400 Received: from mail-pj1-x1031.google.com (mail-pj1-x1031.google.com [IPv6:2607:f8b0:4864:20::1031]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0EA5813DE9; Mon, 19 Sep 2022 10:24:59 -0700 (PDT) Received: by mail-pj1-x1031.google.com with SMTP id q15-20020a17090a304f00b002002ac83485so6825663pjl.0; Mon, 19 Sep 2022 10:24:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date; bh=bbpyEIxy2q5E0Mu0eFfeDQBjUZV6iZmC2F5w0SRo/n0=; b=Co/4gbdqV3wYszCUQb+RGNGJu20t0HKKIu5oDP6hA8o9BdkU2FmW7i7IcL+7qo2PaC gM4RjQzS/YttfgyX5aTlw6dn83JpW5nnVlJPkKOC2VdS3K56xvI+AGNZfBtbF/h1rFER ScpZLXretyLf+Rt5TNkDJFqMg/kQ2Ipeq1lo7ytmLUhfwl5T7t+p5MOqXuiRfV4iyrJp Q8j82WniFh2z9s041bYtoTiYgUNtESbIF5HpSuNW1z0aCwe1479MPo92D2QSvDuadXob nNC7P8bvFcBWcvO0WucpeKiFL4sbIyYia87lUj0/OSbuGM0B/3hp4Okx1oAQO7TWN6UM a+5w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date; bh=bbpyEIxy2q5E0Mu0eFfeDQBjUZV6iZmC2F5w0SRo/n0=; b=ohNvj3FJkuYO3zIU23XcvXFOT1wHPKmREsZ8EaQZntGXa6PZEevTv8FplBLJ+B74Ar WSdRDQrtgwiQhniYGntaBePSv0C9ub14wyTwa5V5E2ZbjJAI6mjxNAeN8bP4a8Jku7T4 HpEPBPDBXzr1f++SK+E/DMr5YVy+iYYn3M6ybwHZF4F1Lacf8tB25Z3mmGU2+xfpdASe AJbGmUHh1GO8xjSrj+LsEdXOKUA4Yr4z4jdF6uPBNTMRY3F0vA2kvx64wW0IVs9DSMAU jJJtrS0jX3Do2i02SrsOs2uRfhEOMmFtkDWTbzH4fOsi45batH0ADroRvoZZxl9an+35 PWhA== X-Gm-Message-State: ACrzQf35eYfvU5KfBDwJK5xcBpJFd6jdP6+VQS+QzSFVW55Dz+HPEHSU wI40lfIT7jrPTjpW15n/1ij4WSpbp3o= X-Google-Smtp-Source: AMsMyM6Qrw6HZuNf6rIjays5IloSGiOAoofUELKN7KLJpWX1ntXV4kAENP3WaVkLwjI5RbzGYGwmPw== X-Received: by 2002:a17:90a:ac10:b0:202:9880:4cae with SMTP id o16-20020a17090aac1000b0020298804caemr20626018pjq.173.1663608297969; Mon, 19 Sep 2022 10:24:57 -0700 (PDT) Received: from localhost.localdomain (KD027092233113.ppp-bb.dion.ne.jp. [27.92.233.113]) by smtp.gmail.com with ESMTPSA id h7-20020aa796c7000000b0053f2505318asm21226480pfq.142.2022.09.19.10.24.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Sep 2022 10:24:57 -0700 (PDT) From: Akinobu Mita To: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-fsdevel@vger.kernel.org, corbet@lwn.net, david@redhat.com, osalvador@suse.de, shuah@kernel.org, Zhao Gongyi , Wei Yongjun , Yicong Yang , Greg Kroah-Hartman , "Rafael J. Wysocki" , Alexander Viro , akpm@linux-foundation.org Cc: Akinobu Mita Subject: [PATCH 2/3] lib/notifier-error-inject: fix error when writing -errno to debugfs file Date: Tue, 20 Sep 2022 02:24:17 +0900 Message-Id: <20220919172418.45257-3-akinobu.mita@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220919172418.45257-1-akinobu.mita@gmail.com> References: <20220919172418.45257-1-akinobu.mita@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org The simple attribute files do not accept a negative value since the commit 488dac0c9237 ("libfs: fix error cast of negative value in simple_attr_write()"). This restores the previous behaviour by using newly introduced DEFINE_SIMPLE_ATTRIBUTE_SIGNED instead of DEFINE_SIMPLE_ATTRIBUTE. Fixes: 488dac0c9237 ("libfs: fix error cast of negative value in simple_attr_write()") Reported-by: Zhao Gongyi Signed-off-by: Akinobu Mita Reviewed-by: David Hildenbrand --- lib/notifier-error-inject.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/notifier-error-inject.c b/lib/notifier-error-inject.c index 21016b32d313..2b24ea6c9497 100644 --- a/lib/notifier-error-inject.c +++ b/lib/notifier-error-inject.c @@ -15,7 +15,7 @@ static int debugfs_errno_get(void *data, u64 *val) return 0; } -DEFINE_SIMPLE_ATTRIBUTE(fops_errno, debugfs_errno_get, debugfs_errno_set, +DEFINE_SIMPLE_ATTRIBUTE_SIGNED(fops_errno, debugfs_errno_get, debugfs_errno_set, "%lld\n"); static struct dentry *debugfs_create_errno(const char *name, umode_t mode, From patchwork Mon Sep 19 17:24:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Akinobu Mita X-Patchwork-Id: 12980824 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2D6F3ECAAD3 for ; Mon, 19 Sep 2022 17:25:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231293AbiISRZS (ORCPT ); Mon, 19 Sep 2022 13:25:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58988 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231192AbiISRZL (ORCPT ); Mon, 19 Sep 2022 13:25:11 -0400 Received: from mail-pg1-x52f.google.com (mail-pg1-x52f.google.com [IPv6:2607:f8b0:4864:20::52f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DE7DD1E3C0; Mon, 19 Sep 2022 10:25:02 -0700 (PDT) Received: by mail-pg1-x52f.google.com with SMTP id bh13so27363789pgb.4; Mon, 19 Sep 2022 10:25:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date; bh=euAaknLa+h5zIEMESHSd9vMo0x33lOPRlPldQOSO1tY=; b=ShNlkKcjQX74zNjF0cFpDDUgQjKD8DIkh4EVc7Mv0LXsJafE4SY2OEYjaXtaX6yg8Z 8PJonHc9SvScgzKL+dfAAtAzN5E0QOm7TMiGh2Ekv8ph4CTYvq458StXhFk/3SPwMm3F pBPxy2kCWa/AcGmxcGJKEWMGDaIOsTcrM8xaBFKZCvGgwW/IdONn/pVcY4Fow5+4aJSw 0cPtz24cRa12OPlbcMKQngJjGnF67wogF9OE5broq9HuQhZ3ydOxsJpbUfpIjX0ugOuw N27BvSJhGKXz03wnL1LZqtd0vyEKXZjs3SigU8Kfz8DrsmsoOySbz9GKYKX7CBuDtB/Q lnpg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date; bh=euAaknLa+h5zIEMESHSd9vMo0x33lOPRlPldQOSO1tY=; b=23UQn5e3Aua4IwfPxPJe0jVDodaXO/0MFLAyLkVyii6rFwg59qTWJdqwhVYxotOOfl SR5bpWUCGdear9c0LbUcu8J8eETh3lHNOE2slv2z2m7gtvDW0rs9PypU4Dpdko+8QHSQ bHjh6dwrRFHGQwvtHHYud0Q5XkV6+VBuh3+pogzSD6hSR/mCpVV0y88OYcQENdp8JAoV tJEmSanSBEomeWUa3K6OhBhHhozfxVi+0dvXZLePwcRzt8H02j9X+Y2Md5UMGWDY3GgR v+u8LT/K9MmNSyYiG0acD/V+DcdDjgfT+TeAur9N9239GCRiC+Of8Px74+DB+CTQ9wfC 4vRw== X-Gm-Message-State: ACrzQf0dczm7oHhkpRZVL9Lt4IOU5CEny4LaLYFTlaaM1DVTfgVklC5w 0+cnziL+XlYNk5WdenPMtZ+9JpKa6nA= X-Google-Smtp-Source: AMsMyM6OTf8JGt0/2O1PiJjtsm9iJk3G5nddptF65VkDZixrBOW+hXa9Ea4CpUGY12LhhkBrwX/ErA== X-Received: by 2002:a63:b64:0:b0:439:8143:c184 with SMTP id a36-20020a630b64000000b004398143c184mr16377617pgl.22.1663608301881; Mon, 19 Sep 2022 10:25:01 -0700 (PDT) Received: from localhost.localdomain (KD027092233113.ppp-bb.dion.ne.jp. [27.92.233.113]) by smtp.gmail.com with ESMTPSA id h7-20020aa796c7000000b0053f2505318asm21226480pfq.142.2022.09.19.10.24.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Sep 2022 10:25:01 -0700 (PDT) From: Akinobu Mita To: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-fsdevel@vger.kernel.org, corbet@lwn.net, david@redhat.com, osalvador@suse.de, shuah@kernel.org, Zhao Gongyi , Wei Yongjun , Yicong Yang , Greg Kroah-Hartman , "Rafael J. Wysocki" , Alexander Viro , akpm@linux-foundation.org Cc: Akinobu Mita Subject: [PATCH 3/3] debugfs: fix error when writing negative value to atomic_t debugfs file Date: Tue, 20 Sep 2022 02:24:18 +0900 Message-Id: <20220919172418.45257-4-akinobu.mita@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220919172418.45257-1-akinobu.mita@gmail.com> References: <20220919172418.45257-1-akinobu.mita@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org The simple attribute files do not accept a negative value since the commit 488dac0c9237 ("libfs: fix error cast of negative value in simple_attr_write()"), so we have to use a 64-bit value to write a negative value for a debugfs file created by debugfs_create_atomic_t(). This restores the previous behaviour by introducing DEFINE_DEBUGFS_ATTRIBUTE_SIGNED for a signed value. Fixes: 488dac0c9237 ("libfs: fix error cast of negative value in simple_attr_write()") Reported-by: Zhao Gongyi Signed-off-by: Akinobu Mita Reviewed-by: David Hildenbrand --- .../fault-injection/fault-injection.rst | 10 +++---- fs/debugfs/file.c | 28 +++++++++++++++---- include/linux/debugfs.h | 19 +++++++++++-- 3 files changed, 43 insertions(+), 14 deletions(-) diff --git a/Documentation/fault-injection/fault-injection.rst b/Documentation/fault-injection/fault-injection.rst index 17779a2772e5..5f6454b9dbd4 100644 --- a/Documentation/fault-injection/fault-injection.rst +++ b/Documentation/fault-injection/fault-injection.rst @@ -83,9 +83,7 @@ configuration of fault-injection capabilities. - /sys/kernel/debug/fail*/times: specifies how many times failures may happen at most. A value of -1 - means "no limit". Note, though, that this file only accepts unsigned - values. So, if you want to specify -1, you better use 'printf' instead - of 'echo', e.g.: $ printf %#x -1 > times + means "no limit". - /sys/kernel/debug/fail*/space: @@ -284,7 +282,7 @@ Application Examples echo Y > /sys/kernel/debug/$FAILTYPE/task-filter echo 10 > /sys/kernel/debug/$FAILTYPE/probability echo 100 > /sys/kernel/debug/$FAILTYPE/interval - printf %#x -1 > /sys/kernel/debug/$FAILTYPE/times + echo -1 > /sys/kernel/debug/$FAILTYPE/times echo 0 > /sys/kernel/debug/$FAILTYPE/space echo 2 > /sys/kernel/debug/$FAILTYPE/verbose echo Y > /sys/kernel/debug/$FAILTYPE/ignore-gfp-wait @@ -338,7 +336,7 @@ Application Examples echo N > /sys/kernel/debug/$FAILTYPE/task-filter echo 10 > /sys/kernel/debug/$FAILTYPE/probability echo 100 > /sys/kernel/debug/$FAILTYPE/interval - printf %#x -1 > /sys/kernel/debug/$FAILTYPE/times + echo -1 > /sys/kernel/debug/$FAILTYPE/times echo 0 > /sys/kernel/debug/$FAILTYPE/space echo 2 > /sys/kernel/debug/$FAILTYPE/verbose echo Y > /sys/kernel/debug/$FAILTYPE/ignore-gfp-wait @@ -369,7 +367,7 @@ Application Examples echo N > /sys/kernel/debug/$FAILTYPE/task-filter echo 100 > /sys/kernel/debug/$FAILTYPE/probability echo 0 > /sys/kernel/debug/$FAILTYPE/interval - printf %#x -1 > /sys/kernel/debug/$FAILTYPE/times + echo -1 > /sys/kernel/debug/$FAILTYPE/times echo 0 > /sys/kernel/debug/$FAILTYPE/space echo 1 > /sys/kernel/debug/$FAILTYPE/verbose diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c index 950c63fa4d0b..38930d9b0bb7 100644 --- a/fs/debugfs/file.c +++ b/fs/debugfs/file.c @@ -378,8 +378,8 @@ ssize_t debugfs_attr_read(struct file *file, char __user *buf, } EXPORT_SYMBOL_GPL(debugfs_attr_read); -ssize_t debugfs_attr_write(struct file *file, const char __user *buf, - size_t len, loff_t *ppos) +static ssize_t debugfs_attr_write_xsigned(struct file *file, const char __user *buf, + size_t len, loff_t *ppos, bool is_signed) { struct dentry *dentry = F_DENTRY(file); ssize_t ret; @@ -387,12 +387,28 @@ ssize_t debugfs_attr_write(struct file *file, const char __user *buf, ret = debugfs_file_get(dentry); if (unlikely(ret)) return ret; - ret = simple_attr_write(file, buf, len, ppos); + if (is_signed) + ret = simple_attr_write_signed(file, buf, len, ppos); + else + ret = simple_attr_write(file, buf, len, ppos); debugfs_file_put(dentry); return ret; } + +ssize_t debugfs_attr_write(struct file *file, const char __user *buf, + size_t len, loff_t *ppos) +{ + return debugfs_attr_write_xsigned(file, buf, len, ppos, false); +} EXPORT_SYMBOL_GPL(debugfs_attr_write); +ssize_t debugfs_attr_write_signed(struct file *file, const char __user *buf, + size_t len, loff_t *ppos) +{ + return debugfs_attr_write_xsigned(file, buf, len, ppos, true); +} +EXPORT_SYMBOL_GPL(debugfs_attr_write_signed); + static struct dentry *debugfs_create_mode_unsafe(const char *name, umode_t mode, struct dentry *parent, void *value, const struct file_operations *fops, @@ -738,11 +754,11 @@ static int debugfs_atomic_t_get(void *data, u64 *val) *val = atomic_read((atomic_t *)data); return 0; } -DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t, debugfs_atomic_t_get, +DEFINE_DEBUGFS_ATTRIBUTE_SIGNED(fops_atomic_t, debugfs_atomic_t_get, debugfs_atomic_t_set, "%lld\n"); -DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t_ro, debugfs_atomic_t_get, NULL, +DEFINE_DEBUGFS_ATTRIBUTE_SIGNED(fops_atomic_t_ro, debugfs_atomic_t_get, NULL, "%lld\n"); -DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t_wo, NULL, debugfs_atomic_t_set, +DEFINE_DEBUGFS_ATTRIBUTE_SIGNED(fops_atomic_t_wo, NULL, debugfs_atomic_t_set, "%lld\n"); /** diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h index f60674692d36..ea2d919fd9c7 100644 --- a/include/linux/debugfs.h +++ b/include/linux/debugfs.h @@ -45,7 +45,7 @@ struct debugfs_u32_array { extern struct dentry *arch_debugfs_dir; -#define DEFINE_DEBUGFS_ATTRIBUTE(__fops, __get, __set, __fmt) \ +#define DEFINE_DEBUGFS_ATTRIBUTE_XSIGNED(__fops, __get, __set, __fmt, __is_signed) \ static int __fops ## _open(struct inode *inode, struct file *file) \ { \ __simple_attr_check_format(__fmt, 0ull); \ @@ -56,10 +56,16 @@ static const struct file_operations __fops = { \ .open = __fops ## _open, \ .release = simple_attr_release, \ .read = debugfs_attr_read, \ - .write = debugfs_attr_write, \ + .write = (__is_signed) ? debugfs_attr_write_signed : debugfs_attr_write, \ .llseek = no_llseek, \ } +#define DEFINE_DEBUGFS_ATTRIBUTE(__fops, __get, __set, __fmt) \ + DEFINE_DEBUGFS_ATTRIBUTE_XSIGNED(__fops, __get, __set, __fmt, false) + +#define DEFINE_DEBUGFS_ATTRIBUTE_SIGNED(__fops, __get, __set, __fmt) \ + DEFINE_DEBUGFS_ATTRIBUTE_XSIGNED(__fops, __get, __set, __fmt, true) + typedef struct vfsmount *(*debugfs_automount_t)(struct dentry *, void *); #if defined(CONFIG_DEBUG_FS) @@ -102,6 +108,8 @@ ssize_t debugfs_attr_read(struct file *file, char __user *buf, size_t len, loff_t *ppos); ssize_t debugfs_attr_write(struct file *file, const char __user *buf, size_t len, loff_t *ppos); +ssize_t debugfs_attr_write_signed(struct file *file, const char __user *buf, + size_t len, loff_t *ppos); struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry, struct dentry *new_dir, const char *new_name); @@ -254,6 +262,13 @@ static inline ssize_t debugfs_attr_write(struct file *file, return -ENODEV; } +static inline ssize_t debugfs_attr_write_signed(struct file *file, + const char __user *buf, + size_t len, loff_t *ppos) +{ + return -ENODEV; +} + static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry, struct dentry *new_dir, char *new_name) {