On Thu, Apr 14, 2022 at 04:23:25PM +0000, Jacky Li wrote: > 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: 3d725965f836 ("crypto: ccp - Add SEV_INIT_EX support") > Signed-off-by: Jacky Li <jackyli@xxxxxxxxxx> > Reviewed-by: Peter Gonda <pgonda@xxxxxxxxxx> > --- > Changelog since v1: > - Added Fixes tag and Reviewed-By tag. > > drivers/crypto/ccp/sev-dev.c | 30 ++++++++++++++++++++++++++++-- > 1 file changed, 28 insertions(+), 2 deletions(-) Patch applied. Thanks. -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt