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[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 ARC-Authentication-Results: i=1; imf11.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=Gl7e0Yg8; spf=pass (imf11.hostedemail.com: domain of akinobu.mita@gmail.com designates 209.85.210.174 as permitted sender) smtp.mailfrom=akinobu.mita@gmail.com; dmarc=pass (policy=none) header.from=gmail.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1663608295; a=rsa-sha256; cv=none; b=JRzNsvQb+jSH21f1Qn577nEXW226fBxiK8xnRg/yxaMWQ6pPWJBTZVeurHcceC/0sX0fbs /XqkFrEGEt28QeTm15z4GReheCG2SYcvPm8KZKxQZuKrhqD+M5HcJ9UMB3VoyNcuK6NtWI eA7DDmGAcZRIpbKaOw9AevHaPVV3wHw= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1663608295; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=dm/xj3UCM5GDvqsqEmDruuZjxjQYqmvO/RJqSynJbxs=; b=0rPyGCwvqSGnawyUN3+6dsLPGjVhJ/KvV7dEW8mXzEkIAJVerpKM7eXcCTR+dKVdKSS7Jh 8KfwDfF1oy5leAUlx7NPfb/+zd98kaBHothFnZxo6IR+1qPobFiL6wWR38ZR9XFrwYep/m CYhttbZC0mqrFML/RcvKGazHE98xO58= Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=Gl7e0Yg8; spf=pass (imf11.hostedemail.com: domain of akinobu.mita@gmail.com designates 209.85.210.174 as permitted sender) smtp.mailfrom=akinobu.mita@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-Stat-Signature: uypybrj141kih4y1sbhcxikhim4uijhz X-Rspamd-Queue-Id: 40D7040019 X-Rspamd-Server: rspam03 X-Rspam-User: X-HE-Tag: 1663608295-786023 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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);