12 Feb
2024
12 Feb
'24
5:56 p.m.
On Mon, Feb 12, 2024 at 12:48 PM Stefan Berger stefanb@linux.ibm.com wrote:
On 1/15/24 13:18, Roberto Sassu wrote:
...
+/**
- ima_kernel_module_request - Prevent crypto-pkcs1pad(rsa,*) requests
- @kmod_name: kernel module name
- We have situation, when public_key_verify_signature() in case of RSA > + * algorithm use alg_name to store internal information in order to
- construct an algorithm on the fly, but crypto_larval_lookup() will try
- to use alg_name in order to load kernel module with same name.
- Since we don't have any real "crypto-pkcs1pad(rsa,*)" kernel modules,
- we are safe to fail such module request from crypto_larval_lookup().
- In this way we prevent modprobe execution during digsig verification
- and avoid possible deadlock if modprobe and/or it's dependencies
- also signed with digsig.
This text needs to some reformulation at some point..
There is no time like the present. If you have a suggestion I would love to hear it and I'm sure Roberto would too.
--
paul-moore.com