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security: Add a hook for the point of notification insertion

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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
This commit is contained in:
David Howells
2020-02-12 13:58:35 +00:00
parent 0858caa419
commit 344fa64ef8
4 changed files with 38 additions and 0 deletions
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9
include/linux/lsm_hooks.h
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@@ -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.
*