From patchwork Thu Jul 11 11:18:55 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xu Kuohai X-Patchwork-Id: 13730484 X-Patchwork-Delegate: paul@paul-moore.com Received: from dggsgout12.his.huawei.com (dggsgout12.his.huawei.com [45.249.212.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 39E3E15E5BB; Thu, 11 Jul 2024 11:14:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720696448; cv=none; b=gIFCjpzvdl845ISDydvR09MvlSgOebvaj6wlpv8EH66pfctV0Y2BzcYCylXC0Bjavw99Lgy6auElFTYd0aWTOhp+KdHVRaDLtz4NKRoYf+jar7Ooccm3y9P9O5fNVqFLn9VjcC1bjErM9wiQXS5zoY9C39YMWfTuMgj+iqhmdFk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720696448; c=relaxed/simple; bh=qrrpdpqqwja83fU2xQi9LV/n3kM40V0F8khJS++VSsY=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=jj4tF9NSdWv3VgUvCyBueiEEIZ7vET2YvcBjRnLErxZTyVIDn3EABymfZT3N18WxaDV2phoetX79H+IG0vLUbrwHreXDuY+3OD39KnNMwariUO3SIWBksZ3NpjAUcu9NIb0VS4yif1/Jw3D6xjhHuuWxOpm1x8XH+Y5aSHORcL8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.93.142]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTP id 4WKXCt0NRNz4f3jdn; Thu, 11 Jul 2024 19:13:46 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.128]) by mail.maildlp.com (Postfix) with ESMTP id B17751A016E; Thu, 11 Jul 2024 19:13:57 +0800 (CST) Received: from k01.huawei.com (unknown [10.67.174.197]) by APP4 (Coremail) with SMTP id gCh0CgCHjPVxvo9mulQgBw--.25300S9; Thu, 11 Jul 2024 19:13:57 +0800 (CST) From: Xu Kuohai To: bpf@vger.kernel.org, netdev@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-integrity@vger.kernel.org, apparmor@lists.ubuntu.com, selinux@vger.kernel.org Cc: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Matt Bobrowski , Brendan Jackman , Paul Moore , James Morris , "Serge E . Hallyn" , Khadija Kamran , Casey Schaufler , Ondrej Mosnacek , Kees Cook , John Johansen , Lukas Bulwahn , Roberto Sassu , Shung-Hsi Yu , Edward Cree , Alexander Viro , Christian Brauner , Trond Myklebust , Anna Schumaker , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Stephen Smalley Subject: [PATCH bpf-next v4 07/20] lsm: Refactor return value of LSM hook setprocattr Date: Thu, 11 Jul 2024 19:18:55 +0800 Message-Id: <20240711111908.3817636-8-xukuohai@huaweicloud.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20240711111908.3817636-1-xukuohai@huaweicloud.com> References: <20240711111908.3817636-1-xukuohai@huaweicloud.com> Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CM-TRANSID: gCh0CgCHjPVxvo9mulQgBw--.25300S9 X-Coremail-Antispam: 1UD129KBjvJXoW3Ww4fXr4kCw4kAFyrJr48tFb_yoWxuw4DpF s8K3W3Gr48GFy7XF4vyFnxCa1a93yrGr17J39xCwnFyFy7Jw4Igay3GFyjkFWfCw18Wr18 KanFqrW3Cr4UAr7anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUBqb4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUAV Cq3wA2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0 rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVW7JVWDJwA2z4x0Y4vE2Ix0cI8IcVCY1x0267 AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E 14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7 xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Y z7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lFIxGxcIEc7CjxVA2Y2ka0xkIwI1l42xK82IYc2 Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s02 6x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26rWY6r4UJwCIc40Y0x0EwIxGrwCI42 IY6xIIjxv20xvE14v26r1I6r4UMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8Jr0_Cr1UMIIF 0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87 Iv6xkF7I0E14v26r4UJVWxJrUvcSsGvfC2KfnxnUUI43ZEXa7IU13l1DUUUUU== X-CM-SenderInfo: 50xn30hkdlqx5xdzvxpfor3voofrz/ From: Xu Kuohai To be consistent with most LSM hooks, convert the return value of hook setprocattr to 0 or a negative error code. Before: - Hook setprocattr returns the number of bytes written on success or a negative error code on failure. After: - Hook setprocattr returns 0 on success or a negative error code on failure. An output parameter @wbytes is introduced to hold the number of bytes written on success. Signed-off-by: Xu Kuohai --- fs/proc/base.c | 5 +++-- include/linux/lsm_hook_defs.h | 3 ++- include/linux/security.h | 5 +++-- security/apparmor/lsm.c | 10 +++++++--- security/security.c | 8 +++++--- security/selinux/hooks.c | 11 ++++++++--- security/smack/smack_lsm.c | 14 ++++++++++---- 7 files changed, 38 insertions(+), 18 deletions(-) diff --git a/fs/proc/base.c b/fs/proc/base.c index 72a1acd03675..9e1cf6cc674d 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2740,6 +2740,7 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, { struct inode * inode = file_inode(file); struct task_struct *task; + size_t wbytes; void *page; int rv; @@ -2785,12 +2786,12 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, rv = security_setprocattr(PROC_I(inode)->op.lsmid, file->f_path.dentry->d_name.name, page, - count); + count, &wbytes); mutex_unlock(¤t->signal->cred_guard_mutex); out_free: kfree(page); out: - return rv; + return rv < 0 ? rv : wbytes; } static const struct file_operations proc_pid_attr_operations = { diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h index dbc16f14f42f..2628514bb19c 100644 --- a/include/linux/lsm_hook_defs.h +++ b/include/linux/lsm_hook_defs.h @@ -287,7 +287,8 @@ LSM_HOOK(int, -EOPNOTSUPP, setselfattr, unsigned int attr, struct lsm_ctx *ctx, u32 size, u32 flags) LSM_HOOK(int, -EINVAL, getprocattr, struct task_struct *p, const char *name, char **value) -LSM_HOOK(int, -EINVAL, setprocattr, const char *name, void *value, size_t size) +LSM_HOOK(int, -EINVAL, setprocattr, const char *name, void *value, size_t size, + size_t *wbytes) LSM_HOOK(int, 0, ismaclabel, const char *name) LSM_HOOK(int, -EOPNOTSUPP, secid_to_secctx, u32 secid, char **secdata, u32 *seclen) diff --git a/include/linux/security.h b/include/linux/security.h index 96a63e132abf..1f1a9696e65d 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -496,7 +496,8 @@ int security_setselfattr(unsigned int attr, struct lsm_ctx __user *ctx, u32 size, u32 flags); int security_getprocattr(struct task_struct *p, int lsmid, const char *name, char **value); -int security_setprocattr(int lsmid, const char *name, void *value, size_t size); +int security_setprocattr(int lsmid, const char *name, void *value, size_t size, + size_t *wbytes); int security_netlink_send(struct sock *sk, struct sk_buff *skb); int security_ismaclabel(const char *name); int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen); @@ -1440,7 +1441,7 @@ static inline int security_getprocattr(struct task_struct *p, int lsmid, } static inline int security_setprocattr(int lsmid, char *name, void *value, - size_t size) + size_t size, size_t *wbytes) { return -EINVAL; } diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c index 72dd09993f28..6c8b1f8c5781 100644 --- a/security/apparmor/lsm.c +++ b/security/apparmor/lsm.c @@ -939,13 +939,17 @@ static int apparmor_setselfattr(unsigned int attr, struct lsm_ctx *ctx, } static int apparmor_setprocattr(const char *name, void *value, - size_t size) + size_t size, size_t *wbytes) { + int rc = -EINVAL; int attr = lsm_name_to_attr(name); if (attr) - return do_setattr(attr, value, size); - return -EINVAL; + rc = do_setattr(attr, value, size); + if (rc < 0) + return rc; + *wbytes = rc; + return 0; } /** diff --git a/security/security.c b/security/security.c index 095e78efcb32..9685096dbf16 100644 --- a/security/security.c +++ b/security/security.c @@ -4141,20 +4141,22 @@ int security_getprocattr(struct task_struct *p, int lsmid, const char *name, * @name: attribute name * @value: attribute value * @size: attribute value size + * @wbytes: bytes written on success * * Write (set) the current task's attribute @name to @value, size @size if * allowed. * - * Return: Returns bytes written on success, a negative value otherwise. + * Return: Returns 0 on success, a negative error code otherwise. */ -int security_setprocattr(int lsmid, const char *name, void *value, size_t size) +int security_setprocattr(int lsmid, const char *name, void *value, size_t size, + size_t *wbytes) { struct security_hook_list *hp; hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) { if (lsmid != 0 && lsmid != hp->lsmid->id) continue; - return hp->hook.setprocattr(name, value, size); + return hp->hook.setprocattr(name, value, size, wbytes); } return LSM_RET_DEFAULT(setprocattr); } diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 0d35bb93baca..7a73f3710025 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -6589,13 +6589,18 @@ static int selinux_getprocattr(struct task_struct *p, return -EINVAL; } -static int selinux_setprocattr(const char *name, void *value, size_t size) +static int selinux_setprocattr(const char *name, void *value, size_t size, + size_t *wbytes) { + int rc = -EINVAL; int attr = lsm_name_to_attr(name); if (attr) - return selinux_lsm_setattr(attr, value, size); - return -EINVAL; + rc = selinux_lsm_setattr(attr, value, size); + if (rc < 0) + return rc; + *wbytes = rc; + return 0; } static int selinux_ismaclabel(const char *name) diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 63d9c5f456c1..4265f2639106 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -3797,19 +3797,25 @@ static int smack_setselfattr(unsigned int attr, struct lsm_ctx *ctx, * @name: the name of the attribute in /proc/.../attr * @value: the value to set * @size: the size of the value + * @wbytes: the length of the smack label written * * Sets the Smack value of the task. Only setting self * is permitted and only with privilege * - * Returns the length of the smack label or an error code + * Returns 0 on success or a negative error code */ -static int smack_setprocattr(const char *name, void *value, size_t size) +static int smack_setprocattr(const char *name, void *value, size_t size, + size_t *wbytes) { + int rc = -EINVAL; int attr = lsm_name_to_attr(name); if (attr != LSM_ATTR_UNDEF) - return do_setattr(attr, value, size); - return -EINVAL; + rc = do_setattr(attr, value, size); + if (rc < 0) + return rc; + *wbytes = rc; + return 0; } /**