linux-kernel - Re: [PATCH 0/3] exporting capability name/code pairs (for 2.6.26)

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Message-ID: <20080423070328.GA5006@martell.zuzino.mipt.ru>
Date:	Wed, 23 Apr 2008 11:03:28 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	KaiGai Kohei <kaigai@...jp.nec.com>
Cc:	greg@...ah.com, morgan@...nel.org, serue@...ibm.com,
	chrisw@...s-sol.org, linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] exporting capability name/code pairs (for 2.6.26)

On Wed, Apr 23, 2008 at 09:38:31AM +0900, KaiGai Kohei wrote:
> Alexey Dobriyan wrote:
>> On Tue, Apr 22, 2008 at 08:12:15PM +0900, KaiGai Kohei wrote:
>>> $ ls -R /sys/kernel/capability/
>>> /sys/kernel/capability/:
>>> codes  names  version
>>>
>>> /sys/kernel/capability/codes:
>>> 0  10  12  14  16  18  2   21  23  25  27  29  30  32  4  6  8
>>> 1  11  13  15  17  19  20  22  24  26  28  3   31  33  5  7  9
>>>
>>> /sys/kernel/capability/names:
>>> cap_audit_control    cap_kill              cap_net_raw     cap_sys_nice
>>> cap_audit_write      cap_lease             cap_setfcap     cap_sys_pacct
>>> cap_chown            cap_linux_immutable   cap_setgid      cap_sys_ptrace
>>> cap_dac_override     cap_mac_admin         cap_setpcap     cap_sys_rawio
>>> cap_dac_read_search  cap_mac_override      cap_setuid      
>>> cap_sys_resource
>>> cap_fowner           cap_mknod             cap_sys_admin   cap_sys_time
>>> cap_fsetid           cap_net_admin         cap_sys_boot    
>>> cap_sys_tty_config
>>> cap_ipc_lock         cap_net_bind_service  cap_sys_chroot
>>> cap_ipc_owner        cap_net_broadcast     cap_sys_module
>>> $ cat /sys/kernel/capability/names/cap_sys_pacct
>>> 20
>>> $ cat /sys/kernel/capability/codes/16
>>> cap_sys_module
>> This is amazing amount of bloat for such conceptually simple feature!
>> Below is /proc/capabilities ,
>> a) without all memory eaten by sysfs files and directories,
>>    generated on the fly
>> b) with capability names matching the ones in manpages
>> c) nicely formatted
>> e) with whole-whooping 2 lines of protection from fool
>> 	(including helpful directions)
>>   Proposed regexp of course will incorrectly match someday
>> If this file will be used often, I can even make whole its content
>> become generated at compile time and then put into buffers
>> with 1 (one) seq_puts()!
>
> I had suggested a similar idea previously, but it could not be supported
> because it requires to scan whole of /proc/capabilities at first.

You claim that libcap people can't or don't want to parse such file?

0	CAP_CHOWN
1	CAP_DAC_OVERRIDE
2	CAP_DAC_READ_SEARCH
3	CAP_FOWNER
4	CAP_FSETID
5	CAP_KILL
6	CAP_SETGID
7	CAP_SETUID
8	CAP_SETPCAP
9	CAP_LINUX_IMMUTABLE
10	CAP_NET_BIND_SERVICE
11	CAP_NET_BROADCAST
12	CAP_NET_ADMIN
13	CAP_NET_RAW
14	CAP_IPC_LOCK
15	CAP_IPC_OWNER
16	CAP_SYS_MODULE
17	CAP_SYS_RAWIO
18	CAP_SYS_CHROOT
19	CAP_SYS_PTRACE
20	CAP_SYS_PACCT
21	CAP_SYS_ADMIN
22	CAP_SYS_BOOT
23	CAP_SYS_NICE
24	CAP_SYS_RESOURCE
25	CAP_SYS_TIME
26	CAP_SYS_TTY_CONFIG
27	CAP_MKNOD
28	CAP_LEASE
29	CAP_AUDIT_WRITE
30	CAP_AUDIT_CONTROL
31	CAP_SETFCAP
32	CAP_MAC_OVERRIDE
33	CAP_MAC_ADMIN

That's what you claim? Do I undestand you correctly?

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