-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
KaiGai Kohei wrote:
> Serge,
>
> Please tell me the meanings of the following condition.
>
>> diff --git a/security/commoncap.c b/security/commoncap.c
>> index 3a95990..cb71bb0 100644
>> --- a/security/commoncap.c
>> +++ b/security/commoncap.c
>> @@ -133,6 +119,12 @@ int cap_capset_check (struct task_struct *target,
>> kernel_cap_t *effective,
>> /* incapable of using this inheritable set */
>> return -EPERM;
>> }
>> + if (!!cap_issubset(*inheritable,
>> + cap_combine(target->cap_inheritable,
>> + current->cap_bset))) {
>> + /* no new pI capabilities outside bounding set */
>> + return -EPERM;
>> + }
>>
>> /* verify restrictions on target's new Permitted set */
>> if (!cap_issubset (*permitted,
>
> It seems to me this condition requires the new inheritable capability
> set must have a capability more than bounding set, at least.
> What is the purpose of this checking?
Yes, the !! was a bug. The correct check is a single !.
(Thus, the correct check says no 'new' pI bits can be outside cap_bset.)
Cheers
Andrew
>
> In the initial state, any process have no inheritable capability set
> and full bounding set. Thus, we cannot do capset() always.
>
> Thanks,
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (Darwin)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
iD8DBQFHVPBS+bHCR3gb8jsRAnxQAJ0Vna82bl9M11OL/uuEe21nF5+9TACfSzGi
aY0SUvMmLZCIF0KovBTpihE=
=wT9N
-----END PGP SIGNATURE-----
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
