From: Roberto Sassu <roberto.sassu@huaweicloud.com>
To: viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz,
chuck.lever@oracle.com, jlayton@kernel.org, neilb@suse.de,
kolga@netapp.com, Dai.Ngo@oracle.com, tom@talpey.com,
paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com,
zohar@linux.ibm.com, dmitry.kasatkin@gmail.com,
eric.snowberg@oracle.com, dhowells@redhat.com, jarkko@kernel.org,
stephen.smalley.work@gmail.com, omosnace@redhat.com,
casey@schaufler-ca.com, shuah@kernel.org, mic@digikod.net
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-nfs@vger.kernel.org, linux-security-module@vger.kernel.org,
linux-integrity@vger.kernel.org, keyrings@vger.kernel.org,
selinux@vger.kernel.org, linux-kselftest@vger.kernel.org,
Roberto Sassu <roberto.sassu@huawei.com>,
Stefan Berger <stefanb@linux.ibm.com>
Subject: [PATCH v10 14/25] security: Introduce path_post_mknod hook
Date: Thu, 15 Feb 2024 11:31:02 +0100 [thread overview]
Message-ID: <20240215103113.2369171-15-roberto.sassu@huaweicloud.com> (raw)
In-Reply-To: <20240215103113.2369171-1-roberto.sassu@huaweicloud.com>
From: Roberto Sassu <roberto.sassu@huawei.com>
In preparation for moving IMA and EVM to the LSM infrastructure, introduce
the path_post_mknod hook.
IMA-appraisal requires all existing files in policy to have a file
hash/signature stored in security.ima. An exception is made for empty files
created by mknod, by tagging them as new files.
LSMs could also take some action after files are created.
The new hook cannot return an error and cannot cause the operation to be
reverted.
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Acked-by: Christian Brauner <brauner@kernel.org>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
---
fs/namei.c | 5 +++++
include/linux/lsm_hook_defs.h | 2 ++
include/linux/security.h | 5 +++++
security/security.c | 14 ++++++++++++++
4 files changed, 26 insertions(+)
diff --git a/fs/namei.c b/fs/namei.c
index ef867f1d6704..9280aa5d60a7 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -4063,6 +4063,11 @@ static int do_mknodat(int dfd, struct filename *name, umode_t mode,
dentry, mode, 0);
break;
}
+
+ if (error)
+ goto out2;
+
+ security_path_post_mknod(idmap, dentry);
out2:
done_path_create(&path, dentry);
if (retry_estale(error, lookup_flags)) {
diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h
index 7f9e9240606e..dba5d8204dc5 100644
--- a/include/linux/lsm_hook_defs.h
+++ b/include/linux/lsm_hook_defs.h
@@ -94,6 +94,8 @@ LSM_HOOK(int, 0, path_mkdir, const struct path *dir, struct dentry *dentry,
LSM_HOOK(int, 0, path_rmdir, const struct path *dir, struct dentry *dentry)
LSM_HOOK(int, 0, path_mknod, const struct path *dir, struct dentry *dentry,
umode_t mode, unsigned int dev)
+LSM_HOOK(void, LSM_RET_VOID, path_post_mknod, struct mnt_idmap *idmap,
+ struct dentry *dentry)
LSM_HOOK(int, 0, path_truncate, const struct path *path)
LSM_HOOK(int, 0, path_symlink, const struct path *dir, struct dentry *dentry,
const char *old_name)
diff --git a/include/linux/security.h b/include/linux/security.h
index 2997348afcb7..977dd9f7f51a 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1893,6 +1893,7 @@ int security_path_mkdir(const struct path *dir, struct dentry *dentry, umode_t m
int security_path_rmdir(const struct path *dir, struct dentry *dentry);
int security_path_mknod(const struct path *dir, struct dentry *dentry, umode_t mode,
unsigned int dev);
+void security_path_post_mknod(struct mnt_idmap *idmap, struct dentry *dentry);
int security_path_truncate(const struct path *path);
int security_path_symlink(const struct path *dir, struct dentry *dentry,
const char *old_name);
@@ -1927,6 +1928,10 @@ static inline int security_path_mknod(const struct path *dir, struct dentry *den
return 0;
}
+static inline void security_path_post_mknod(struct mnt_idmap *idmap,
+ struct dentry *dentry)
+{ }
+
static inline int security_path_truncate(const struct path *path)
{
return 0;
diff --git a/security/security.c b/security/security.c
index 145e3141339c..b55f9ad294cc 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1801,6 +1801,20 @@ int security_path_mknod(const struct path *dir, struct dentry *dentry,
}
EXPORT_SYMBOL(security_path_mknod);
+/**
+ * security_path_post_mknod() - Update inode security field after file creation
+ * @idmap: idmap of the mount
+ * @dentry: new file
+ *
+ * Update inode security field after a file has been created.
+ */
+void security_path_post_mknod(struct mnt_idmap *idmap, struct dentry *dentry)
+{
+ if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
+ return;
+ call_void_hook(path_post_mknod, idmap, dentry);
+}
+
/**
* security_path_mkdir() - Check if creating a new directory is allowed
* @dir: parent directory
--
2.34.1
next prev parent reply other threads:[~2024-02-15 10:36 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-15 10:30 [PATCH v10 00/25] security: Move IMA and EVM to the LSM infrastructure Roberto Sassu
2024-02-15 10:30 ` [PATCH v10 01/25] ima: Align ima_inode_post_setattr() definition with " Roberto Sassu
2024-02-15 10:30 ` [PATCH v10 02/25] ima: Align ima_file_mprotect() " Roberto Sassu
2024-02-15 10:30 ` [PATCH v10 03/25] ima: Align ima_inode_setxattr() " Roberto Sassu
2024-02-15 10:30 ` [PATCH v10 04/25] ima: Align ima_inode_removexattr() " Roberto Sassu
2024-02-15 10:30 ` [PATCH v10 05/25] ima: Align ima_post_read_file() " Roberto Sassu
2024-02-15 10:30 ` [PATCH v10 06/25] evm: Align evm_inode_post_setattr() " Roberto Sassu
2024-02-15 10:30 ` [PATCH v10 07/25] evm: Align evm_inode_setxattr() " Roberto Sassu
2024-02-15 10:30 ` [PATCH v10 08/25] evm: Align evm_inode_post_setxattr() " Roberto Sassu
2024-02-15 10:30 ` [PATCH v10 09/25] security: Align inode_setattr hook definition with EVM Roberto Sassu
2024-02-15 10:30 ` [PATCH v10 10/25] security: Introduce inode_post_setattr hook Roberto Sassu
2024-02-15 10:30 ` [PATCH v10 11/25] security: Introduce inode_post_removexattr hook Roberto Sassu
2024-02-15 10:31 ` [PATCH v10 12/25] security: Introduce file_post_open hook Roberto Sassu
2024-02-15 10:31 ` [PATCH v10 13/25] security: Introduce file_release hook Roberto Sassu
2024-02-15 10:31 ` Roberto Sassu [this message]
2024-02-15 10:31 ` [PATCH v10 15/25] security: Introduce inode_post_create_tmpfile hook Roberto Sassu
2024-02-15 10:31 ` [PATCH v10 16/25] security: Introduce inode_post_set_acl hook Roberto Sassu
2024-02-15 10:31 ` [PATCH v10 17/25] security: Introduce inode_post_remove_acl hook Roberto Sassu
2024-02-15 10:31 ` [PATCH v10 18/25] security: Introduce key_post_create_or_update hook Roberto Sassu
2024-02-15 10:31 ` [PATCH v10 19/25] integrity: Move integrity_kernel_module_request() to IMA Roberto Sassu
2024-02-15 16:09 ` Roberto Sassu
2024-02-16 0:25 ` Mimi Zohar
2024-02-15 10:31 ` [PATCH v10 20/25] ima: Move to LSM infrastructure Roberto Sassu
2024-02-15 10:31 ` [PATCH v10 21/25] ima: Move IMA-Appraisal " Roberto Sassu
2024-02-15 10:31 ` [PATCH v10 22/25] evm: Move " Roberto Sassu
2024-02-15 10:31 ` [PATCH v10 23/25] evm: Make it independent from 'integrity' LSM Roberto Sassu
2024-02-15 10:31 ` [PATCH v10 24/25] ima: " Roberto Sassu
2024-02-15 10:31 ` [PATCH v10 25/25] integrity: Remove LSM Roberto Sassu
2024-02-16 4:43 ` [PATCH v10 0/25] security: Move IMA and EVM to the LSM infrastructure Paul Moore
2024-02-16 7:54 ` Roberto Sassu
2024-02-16 22:34 ` [PATCH v10 00/25] " Eric Snowberg
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