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Notes for TOMOYO Linux project |
Notes for TOMOYO Linux project |
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This is a handy Mandatory Access Control patch for Linux kernels. |
This is a handy Mandatory Access Control patch for Linux kernels. |
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This patch is released under the GPL. |
This patch is released under the GPLv2. |
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Project URL: http://tomoyo.sourceforge.jp/ |
Project URL: http://tomoyo.sourceforge.jp/ |
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1146 |
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1147 |
Fix 2008/02/05 |
Fix 2008/02/05 |
1148 |
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1149 |
@ Use find_task_by_vpid() instead of find_task_pid(). |
@ Use find_task_by_vpid() instead of find_task_by_pid(). |
1150 |
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1151 |
Kernel 2.6.24 introduced PID namespace. |
Kernel 2.6.24 introduced PID namespace. |
1152 |
To search PID given from userland, the kernel needs to use |
To search PID given from userland, the kernel needs to use |
1153 |
find_task_by_vpid() instead of find_task_pid(). |
find_task_by_vpid() instead of find_task_by_pid(). |
1154 |
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1155 |
Fix 2008/02/14 |
Fix 2008/02/14 |
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1247 |
By default, this handler does nothing (i.e. merely reject execve() |
By default, this handler does nothing (i.e. merely reject execve() |
1248 |
request). You can specify any program to start what you want to do. |
request). You can specify any program to start what you want to do. |
1249 |
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1250 |
You can redirect attackers to somewhere else (e.g. honeypot). |
You can redirect attackers to somewhere else (e.g. honey pot). |
1251 |
This makes it possible to act your Linux box as an on-demand honeypot |
This makes it possible to act your Linux box as an on-demand honey pot |
1252 |
while keeping regular services for your usage. |
while keeping regular services for your usage. |
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You can collect information of the attacker (e.g. IP address) and |
You can collect information of the attacker (e.g. IP address) and |
1301 |
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1302 |
Fix 2008/03/10 |
Fix 2008/03/10 |
1303 |
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1304 |
@ Rename "force_alt_exec" keyword to "preferred_execute_handler". |
@ Rename "force_alt_exec" keyword to "execute_handler". |
1305 |
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1306 |
To be able to use different programs for validating execve() parameters, |
To be able to use different programs for validating execve() parameters, |
1307 |
I moved the location to specify the program's pathname from profile |
I moved the location to specify the program's pathname from profile |
1308 |
to domain policy. |
to domain policy. |
1309 |
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1310 |
The "preferred_execute_handler" keyword takes one pathname which is |
The "execute_handler" keyword takes one pathname which is |
1311 |
invoked whenever execve() request is issued. Thus, any "allow_execute" |
invoked whenever execve() request is issued. Thus, any "allow_execute" |
1312 |
keywords in a domain with "preferred_execute_handler" are ignored. |
keywords in a domain with "execute_handler" are ignored. |
1313 |
This keyword is designed for validating expected/desirable execve() |
This keyword is designed for validating expected/desirable execve() |
1314 |
requests in userspace, although there is no way to tell the caller |
requests in userspace, although there is no way to tell the caller |
1315 |
that the execve() request was rejected. |
that the execve() request was rejected. |
1316 |
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1317 |
@ Rename "alt_exec" keyword to "default_execute_handler". |
@ Rename "alt_exec" keyword to "denied_execute_handler". |
1318 |
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1319 |
The "default_execute_handler" keyword takes one pathname which is |
The "denied_execute_handler" keyword takes one pathname which is |
1320 |
invoked only when execve() request was rejected. In other words, |
invoked only when execve() request was rejected. In other words, |
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this program is invoked only when the following conditions are met. |
this program is invoked only when the following conditions are met. |
1322 |
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(1) None of "allow_execute" keywords in the domain didn't match. |
(1) None of "allow_execute" keywords in the domain matched. |
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(2) The execve() request was rejected in enforcing mode. |
(2) The execve() request was rejected in enforcing mode. |
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(3) "preferred_execute_handler" keyword is not used by the domain. |
(3) "execute_handler" keyword is not used by the domain. |
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1327 |
This keyword is designed for handling unexpected/undesirable execve() |
This keyword is designed for handling unexpected/undesirable execve() |
1328 |
requests, to redirect the process issuing such requests to somewhere. |
requests, to redirect the process issuing such requests to somewhere. |
1329 |
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1330 |
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Fix 2008/03/18 |
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1332 |
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@ Fix wrong/redundant locks in pre-vfs functions. |
1333 |
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1334 |
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lock_kernel()/unlock_kernel() in pre_vfs_rename() were redundant for |
1335 |
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2.6 kernels. |
1336 |
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1337 |
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Locking order in pre_vfs_link() and pre_vfs_unlink() for 2.4 kernels |
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after 2.4.33 were different from before 2.4.32 . |
1339 |
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1340 |
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Fix 2008/03/28 |
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@ Disable execute handler loop. |
1343 |
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To be able to use "execute_handler" in a "keep_domain" domain, |
1345 |
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ignore "execute_handler" and "denied_execute_handler" keywords |
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if the current process is executing programs specified by |
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"execute_handler" or "denied_execute_handler" keyword. |
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This exception is needed to avoid infinite execute handler loop. |
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If a domain has both "keep_domain" and "execute_handler", |
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any execute request by that domain is handled by an execute handler, |
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and the execute handler attempts to process original execute request. |
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But the original execute request is handled by the same execute handler |
1354 |
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unless the execute handler ignores "execute_handler". |
1355 |
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1356 |
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@ Update coding style. |
1357 |
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I rewrote the code to pass scripts/checkpatch.pl as much as possible. |
1359 |
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Function names were changed to use only lower letters. |
1360 |
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Version 1.6.0 2008/04/01 Feature enhancement release. |
1362 |
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Fix 2008/04/14 |
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@ Fix "Compilation failures" and "Initialization ordering bugs" |
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with kernels before 2.4.30/2.6.11 . |
1367 |
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2.6 kernels before 2.6.9 didn't have include/linux/hardirq.h , |
1369 |
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resulting compilation error at #include <linux/hardirq.h> . |
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I added #elif condition. |
1371 |
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CentOS 4.6's 2.6.9 kernel calls do_execve() before initialization of |
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ccs_alloc(), resulting NULL pointer dereference. |
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I changed __initcall to core_initcall. |
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CentOS 4.6's 2.6.9 kernel backported kzalloc() from 2.6.14 , |
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resulting compilation error at kzalloc(). |
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I modified prototype of kzalloc(). |
1379 |
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Fix 2008/04/20 |
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@ Fix "Compilation failures" with kernels before 2.4.30/2.6.11 . |
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Turbolinux 10 Server's 2.6.8 kernel backported kzalloc() as an inlined |
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function, resulting compilation error at kzalloc(). |
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I converted kzalloc() from an inlined function into a macro. |
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Fix 2008/04/21 |
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@ Add workaround for gcc 3.2.2's inline bug. |
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RedHat Linux 9's gcc 3.2.2 generated a bad code |
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if ((var_of_u8 & 0x000000BF) & 0x80000000) { } |
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where the expected code is |
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if ((var_of_u8 & 0xBF) & 0x80) { } |
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when embedding ccs_acl_type2() into print_entry(), |
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resulting runtime BUG(). |
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I added the expected code explicitly as a workaround. |
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Fix 2008/05/06 |
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@ Add memory quota. |
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1.5.x returns -ENOMEM when FindNextDomain() failed to create a new |
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domain, but I forgot to return -ENOMEM when find_next_domain() failed to |
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create a new domain. |
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A domain is automatically created by find_next_domain() only if |
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the domain for the requested program doesn't exist. |
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This behavior is for the administrator's convenience. |
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The administrator needn't to know how many domains are needed for running |
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the whole programs in the system beforehand when developing the policy. |
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But the administrator does not want the kernel to reject execution of the |
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requested program when developing the policy. |
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So, I think it is better to grant execution of programs even if |
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find_next_domain() failed to create a new domain than reject execution. |
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Thus, I decided not to return -ENOMEM when find_next_domain() failed to |
1419 |
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create a new domain. This exception breaks the domain transition rules, |
1420 |
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so I print "transition_failed" warning in /proc/ccs/domain_policy |
1421 |
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when this exception happened. |
1422 |
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1423 |
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Also, to prevent the system from being halted by unexpectedly allocating |
1424 |
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all kernel memory for the policy, I added memory quota. |
1425 |
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This quota is configurable via /proc/ccs/meminfo like |
1426 |
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1427 |
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echo Shared: 1048576 > /proc/ccs/meminfo |
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echo Private: 1048576 > /proc/ccs/meminfo |
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Version 1.6.1 2008/05/10 Bug fix release. |
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1432 |
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Fix 2008/06/04 |
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@ Check open mode of /proc/ccs/ interface. |
1435 |
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It turned out that I can avoid allocating memory for reading if |
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FMODE_READ is not set and memory for writing if FMODE_WRITE is not set. |
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@ Wait for completion of /sbin/ccs-init . |
1440 |
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Since 2.4 kernel's call_usermodehelper() can't wait for termination of |
1442 |
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the executed program, I was using the close() request of |
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/proc/ccs/meminfo to indicate that loading policy has finished. |
1444 |
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But since /proc/ccs/meminfo could be accessed for setting memory quota |
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by /etc/ccs/ccs-post-init , I stopped using the close() request. |
1446 |
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The policy loader no longer need to access /proc/ccs/meminfo to notify |
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the kernel that loading policy has finished. |
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Fix 2008/06/05 |
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@ Fix realpath for pipes and sockets. |
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Kernel 2.6.22 and later use different method for calculating d_path(). |
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Since fs/realpath.c didn't notice the change, the realpath of pipes |
1455 |
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appeared as "pipe:" rather than "pipe:[\$]" when they are opened via |
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/proc/PID/fd/ directory. |
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@ Add process's information into /proc/ccs/query . |
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While /proc/ccs/grant_log and /proc/ccs/reject_log contain process's |
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information, /proc/ccs/query doesn't contain it. |
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To be able to utilize ccs-queryd and ccs-notifyd more, I added it into |
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/proc/ccs/query . |
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Fix 2008/06/10 |
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@ Allow using patterns for globally readable files. |
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1469 |
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To allow users specify locale specific files to globally readable files, |
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I relaxed checking in update_globally_readable_entry(). |
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Fix 2008/06/11 |
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@ Remove ALLOW_ENFORCE_GRACE parameter. |
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1476 |
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Since unexpected requests caused by doing software updates can happen |
1477 |
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in all profiles, users likely have to write ALLOW_ENFORCE_GRACE=enabled |
1478 |
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to all profiles. And it makes meaningless to allow users to selectively |
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enable specific profile's ALLOW_ENFORCE_GRACE parameter. |
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So, I removed ALLOW_ENFORCE_GRACE parameter. |
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Now, the system behaves as if ALLOW_ENFORCE_GRACE=enabled is specified. |
1482 |
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The behavior of "delayed enforcing" mode is defined in the following |
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order. |
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(1) The requests are rejected immediately if nobody is opening |
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/proc/ccs/query interface. |
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(2) The requests will be rejected in 10 seconds if somebody other than |
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ccs-queryd (such as less(1)) is opening /proc/ccs/query interface, |
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for such process doesn't write dummy decisions. |
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Fix 2008/06/22 |
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@ Pass escaped pathname to audit_execute_handler_log(). |
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I was passing unescaped pathname to audit_execute_handler_log() |
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which causes /proc/ccs/grant_log contain whitespace characters |
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if execute handler's pathname contains whitespace characters. |
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Fix 2008/06/25 |
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@ Return 0 when ccs_may_umount() succeeds. |
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I forgot to clear error value in ccs_may_umount() when the requested |
1504 |
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directory didn't match "deny_unmount" keyword. As a result, any umount() |
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request with RESTRICT_UNMOUNT=enforcing returned -EPERM error. |
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Version 1.6.2 2008/06/25 Usability enhancement release. |
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Fix 2008/07/01 |
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@ Fix "Compilation failure" with 2.4.20 kernel. |
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RedHat Linux 9's 2.4.20 kernel backported O(1) scheduler patch, |
1514 |
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resulting compilation error at ccs_load_policy(). |
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I added defined(TASK_DEAD) check. |
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Fix 2008/07/08 |
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@ Don't check permissions if vfsmount is NULL. |
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Some filesystems (e.g. unionfs) pass NULL vfsmount. |
1522 |
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I changed fs/tomoyo_file.c not to try to calculate pathnames |
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if vfsmount is NULL. |
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1525 |
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Version 1.6.3 2008/07/15 Bug fix release. |
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1527 |
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Fix 2008/08/21 |
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@ Add workaround for gcc 4.3's bug. |
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1531 |
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In some environments, fs/tomoyo_network.c could not be compiled |
1532 |
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because of gcc 4.3's bug. |
1533 |
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I modified save_ipv6_address() to use "integer literal" value |
1534 |
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instead for "static const u8" variable. |
1535 |
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@ Change prototypes of some functions. |
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To support 2.6.27 kernels, I replaced "struct nameidata" with |
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"struct path" for some functions. |
1540 |
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@ Detect distributor specific patches automatically. |
1542 |
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Since kernels with AppArmor patch applied is increasing, |
1544 |
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I introduced a mechanism which determines whether specific patches |
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are applied or not, based on "#define" directives in the patches. |
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Fix 2008/08/29 |
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@ Remove "-ccs" suffix from Makefile's EXTRAVERSION. |
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To reduce conflicts on Makefile's EXTRAVERSION, |
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I removed "-ccs" suffix from ccs-patch-2.\*.diff . |
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Those who build kernels without using specs/build-\*.sh , |
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please edit EXTRAVERSION tag manually so that original kernels |
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will not be overwritten by TOMOYO Linux kernels. |
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Version 1.6.4 2008/09/?? Minor update release. |