device_cgroup: Roll back to original exceptions after copy failure

When add the 'a *:* rwm' entry to devcgroup A's whitelist, at first A's
exceptions will be cleaned and A's behavior is changed to
DEVCG_DEFAULT_ALLOW. Then parent's exceptions will be copyed to A's
whitelist. If copy failure occurs, just return leaving A to grant
permissions to all devices. And A may grant more permissions than
parent.

Backup A's whitelist and recover original exceptions after copy
failure.

Cc: [email protected]
Fixes: 4cef7299b478 ("device_cgroup: add proper checking when changing default behavior")
Signed-off-by: Wang Weiyang <[email protected]>
Reviewed-by: Aristeu Rozanski <[email protected]>
Signed-off-by: Paul Moore <[email protected]>

0 files changed, 0 insertions, 0 deletions