crypto: ccp - Fix the INIT_EX data file open failure
There are 2 common cases when INIT_EX data file might not be opened successfully and fail the sev initialization: 1. In user namespaces, normal user tasks (e.g. VMM) can change their current->fs->root to point to arbitrary directories. While init_ex_path is provided as a module param related to root file system. Solution: use the root directory of init_task to avoid accessing the wrong file. 2. Normal user tasks (e.g. VMM) don't have the privilege to access the INIT_EX data file. Solution: open the file as root and restore permissions immediately. Fixes: 3d725965 ("crypto: ccp - Add SEV_INIT_EX support") Signed-off-by:Jacky Li <jackyli@google.com> Reviewed-by:
Peter Gonda <pgonda@google.com> Acked-by:
Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by:
Herbert Xu <herbert@gondor.apana.org.au>
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