Hi David, this patch doesn't compile with CONFIG_SECURITY=n: ./include/linux/security.h: In function 'security_inode_need_killpriv': ./include/linux/security.h:893:40: error: passing argument 1 of 'cap_inode_need_killpriv' from incompatible pointer type [-Werror=incompatible-pointer-types] 893 | return cap_inode_need_killpriv(dentry); | ^~~~~~ | | | struct dentry * ./include/linux/security.h:153:52: note: expected 'struct user_namespace *' but argument is of type 'struct dentry *' 153 | int cap_inode_need_killpriv(struct user_namespace *mnt_userns, | ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~ I applied the patch on linux-next tag next-20220318, but the relevant part doesn't seem to have changed lately. Regards Luca