diff options
| author | David Howells <dhowells@redhat.com> | 2020-02-12 13:58:35 +0000 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2020-05-19 15:08:23 +0100 |
| commit | 344fa64ef8f6740e99b32ab788b6e3742d7284b3 (patch) | |
| tree | 44170f4c17e4e98be3bec9972ef6fa6531a52582 /include | |
| parent | 0858caa419e6cf9d31e734d09d70b34f64443ef6 (diff) | |
security: Add a hook for the point of notification insertion
Add a security hook that allows an LSM to rule on whether a notification
message is allowed to be inserted into a particular watch queue.
The hook is given the following information:
(1) The credentials of the triggerer (which may be init_cred for a system
notification, eg. a hardware error).
(2) The credentials of the whoever set the watch.
(3) The notification message.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: James Morris <jamorris@linux.microsoft.com>
cc: Casey Schaufler <casey@schaufler-ca.com>
cc: Stephen Smalley <sds@tycho.nsa.gov>
cc: linux-security-module@vger.kernel.org
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/lsm_hook_defs.h | 5 | ||||
| -rw-r--r-- | include/linux/lsm_hooks.h | 9 | ||||
| -rw-r--r-- | include/linux/security.h | 15 |
3 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h index 5616b2567aa7..e0def45b5cc5 100644 --- a/include/linux/lsm_hook_defs.h +++ b/include/linux/lsm_hook_defs.h @@ -253,6 +253,11 @@ LSM_HOOK(int, 0, inode_setsecctx, struct dentry *dentry, void *ctx, u32 ctxlen) LSM_HOOK(int, 0, inode_getsecctx, struct inode *inode, void **ctx, u32 *ctxlen) +#if defined(CONFIG_SECURITY) && defined(CONFIG_WATCH_QUEUE) +LSM_HOOK(int, 0, post_notification, const struct cred *w_cred, + const struct cred *cred, struct watch_notification *n) +#endif /* CONFIG_SECURITY && CONFIG_KEY_NOTIFICATIONS */ + #ifdef CONFIG_SECURITY_NETWORK LSM_HOOK(int, 0, unix_stream_connect, struct sock *sock, struct sock *other, struct sock *newsk) diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h index 988ca0df7824..0b5e5769b836 100644 --- a/include/linux/lsm_hooks.h +++ b/include/linux/lsm_hooks.h @@ -1437,6 +1437,15 @@ * @ctx is a pointer in which to place the allocated security context. * @ctxlen points to the place to put the length of @ctx. * + * Security hooks for the general notification queue: + * + * @post_notification: + * Check to see if a watch notification can be posted to a particular + * queue. + * @w_cred: The credentials of the whoever set the watch. + * @cred: The event-triggerer's credentials + * @n: The notification being posted + * * Security hooks for using the eBPF maps and programs functionalities through * eBPF syscalls. * diff --git a/include/linux/security.h b/include/linux/security.h index a8d9310472df..9a5d12ab491b 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -56,6 +56,8 @@ struct mm_struct; struct fs_context; struct fs_parameter; enum fs_value_type; +struct watch; +struct watch_notification; /* Default (no) options for the capable function */ #define CAP_OPT_NONE 0x0 @@ -1275,6 +1277,19 @@ static inline int security_locked_down(enum lockdown_reason what) } #endif /* CONFIG_SECURITY */ +#if defined(CONFIG_SECURITY) && defined(CONFIG_WATCH_QUEUE) +int security_post_notification(const struct cred *w_cred, + const struct cred *cred, + struct watch_notification *n); +#else +static inline int security_post_notification(const struct cred *w_cred, + const struct cred *cred, + struct watch_notification *n) +{ + return 0; +} +#endif + #ifdef CONFIG_SECURITY_NETWORK int security_unix_stream_connect(struct sock *sock, struct sock *other, struct sock *newsk); |