於 四,2012-09-20 於 10:41 -0400,Matthew Garrett 提到: > From: Josh Boyer <jwboyer@xxxxxxxxxx> > > This forcibly drops CAP_COMPROMISE_KERNEL from both cap_permitted and cap_bset > in the init_cred struct, which everything else inherits from. This works on > any machine and can be used to develop even if the box doesn't have UEFI. > > Signed-off-by: Josh Boyer <jwboyer@xxxxxxxxxx> Patch works to me for test lock the IO port access. Tested-by: Lee, Chun-Yi <jlee@xxxxxxxx> Joey Lee > --- > kernel/cred.c | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > > diff --git a/kernel/cred.c b/kernel/cred.c > index de728ac..7e6e83f 100644 > --- a/kernel/cred.c > +++ b/kernel/cred.c > @@ -623,6 +623,23 @@ void __init cred_init(void) > 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); > } > > +void __init secureboot_enable() > +{ > + pr_info("Secure boot enabled\n"); > + cap_lower((&init_cred)->cap_bset, CAP_COMPROMISE_KERNEL); > + cap_lower((&init_cred)->cap_permitted, CAP_COMPROMISE_KERNEL); > +} > + > +/* Dummy Secure Boot enable option to fake out UEFI SB=1 */ > +static int __init secureboot_enable_opt(char *str) > +{ > + int sb_enable = !!simple_strtol(str, NULL, 0); > + if (sb_enable) > + secureboot_enable(); > + return 1; > +} > +__setup("secureboot_enable=", secureboot_enable_opt); > + > /** > * prepare_kernel_cred - Prepare a set of credentials for a kernel service > * @daemon: A userspace daemon to be used as a reference -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html