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| author | Roberto Sassu <roberto.sassu@huawei.com> | 2024-02-15 11:30:59 +0100 |
|---|---|---|
| committer | Paul Moore <paul@paul-moore.com> | 2024-02-15 23:43:42 -0500 |
| commit | dae52cbf5887ac51c3574648124cfe475a9b3246 (patch) | |
| tree | ebba0f72a35b8983541589e03cc7ff0362a40a59 /security/security.c | |
| parent | 77fa6f314f0376176ef6bf3d84403e0d8b54ce28 (diff) | |
| download | lwn-dae52cbf5887ac51c3574648124cfe475a9b3246.tar.gz lwn-dae52cbf5887ac51c3574648124cfe475a9b3246.zip | |
security: Introduce inode_post_removexattr hook
In preparation for moving IMA and EVM to the LSM infrastructure, introduce
the inode_post_removexattr hook.
At inode_removexattr hook, EVM verifies the file's existing HMAC value. At
inode_post_removexattr, EVM re-calculates the file's HMAC with the passed
xattr removed and other file metadata.
Other LSMs could similarly take some action after successful xattr removal.
The new hook cannot return an error and cannot cause the operation to be
reverted.
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
Acked-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'security/security.c')
| -rw-r--r-- | security/security.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/security/security.c b/security/security.c index 56527d5415e2..d77fdd3ca1bc 100644 --- a/security/security.c +++ b/security/security.c @@ -2453,6 +2453,20 @@ int security_inode_removexattr(struct mnt_idmap *idmap, } /** + * security_inode_post_removexattr() - Update the inode after a removexattr op + * @dentry: file + * @name: xattr name + * + * Update the inode after a successful removexattr operation. + */ +void security_inode_post_removexattr(struct dentry *dentry, const char *name) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) + return; + call_void_hook(inode_post_removexattr, dentry, name); +} + +/** * security_inode_need_killpriv() - Check if security_inode_killpriv() required * @dentry: associated dentry * |