| 2088 |
@ Transit to new domain before do_execve() succeeds. |
@ Transit to new domain before do_execve() succeeds. |
| 2089 |
|
|
| 2090 |
Permission checks for interpreters and environment variables are |
Permission checks for interpreters and environment variables are |
| 2091 |
done using new domain. In order to be allow ccs-queryd to reach the new |
done using new domain. In order to allow ccs-queryd to reach the new |
| 2092 |
domain via global PID, I reverted "Don't transit to new domain until |
domain via global PID, I reverted "Don't transit to new domain until |
| 2093 |
do_execve() succeeds." made on 2008/10/07. |
do_execve() succeeds." made on 2008/10/07. |
| 2094 |
|
|
| 2273 |
|
|
| 2274 |
@ Use rcu_read_lock() for find_task_by_pid(). |
@ Use rcu_read_lock() for find_task_by_pid(). |
| 2275 |
|
|
| 2276 |
Since kernel 2.6.16 , caller of find_task_by_pid() needs to call |
Since kernel 2.6.18 , caller of find_task_by_pid() needs to call |
| 2277 |
rcu_read_lock() rather than read_lock(&tasklist_lock) because find_pid() |
rcu_read_lock() rather than read_lock(&tasklist_lock) because find_pid() |
| 2278 |
uses RCU primitives but spinlock does not prevent RCU callback if |
uses RCU primitives but spinlock does not prevent RCU callback if |
| 2279 |
preemptive RCU ( CONFIG_PREEMPT_RCU or CONFIG_TREE_PREEMPT_RCU ) is |
preemptive RCU ( CONFIG_PREEMPT_RCU or CONFIG_TREE_PREEMPT_RCU ) is |
| 2280 |
enabled. |
enabled. |
| 2281 |
|
|
| 2282 |
|
Fix 2009/12/15 |
| 2283 |
|
|
| 2284 |
|
@ Allow deleting "quota_exceeded" and "transition_failed" entries. |
| 2285 |
|
|
| 2286 |
|
To notify users of "this domain has too many entries to hold" and "some |
| 2287 |
|
process in this domain was not able to perform domain transition", |
| 2288 |
|
"quota_exceeded" and "transition_failed" messages are used respectively. |
| 2289 |
|
These messages were not deletable. But it is more convenient for users |
| 2290 |
|
to be notified again if such events occurred again after tuning policy. |
| 2291 |
|
Thus, I made these messages deletable. |
| 2292 |
|
|
| 2293 |
|
Fix 2009/12/17 |
| 2294 |
|
|
| 2295 |
|
@ Don't check read permission in ccs_try_alt_exec(). |
| 2296 |
|
|
| 2297 |
|
While I was trying to remove ccs_execve_list list for GC optimization |
| 2298 |
|
between TOMOYO 1.7.0 and 1.7.1 , I made a mistake which made TOMOYO to |
| 2299 |
|
check allow_read permission of the programs specified by execute_handler |
| 2300 |
|
and denied_execute_handler keywords. |
| 2301 |
|
|
| 2302 |
|
@ Don't check DAC permission if disabled mode. |
| 2303 |
|
|
| 2304 |
|
I was checking DAC permissions regarding directory entry modification |
| 2305 |
|
operations (e.g. mkdir()) even if mode=disabled . It is a waste of CPU |
| 2306 |
|
resource to check DAC permissions when MAC permissions are not checked. |
| 2307 |
|
Thus, I modified to skip DAC permission checks if mode=disabled . |
| 2308 |
|
|
| 2309 |
|
Fix 2009/12/19 |
| 2310 |
|
|
| 2311 |
|
@ Fix memory leak in ccs_environ(). |
| 2312 |
|
|
| 2313 |
|
When I fixed a bug that a permission like |
| 2314 |
|
|
| 2315 |
|
allow_env PATH if exec.envp["PATH"]="/" |
| 2316 |
|
|
| 2317 |
|
was not working (2009/11/02), I allocated two buffers but only one buffer |
| 2318 |
|
was released. |
| 2319 |
|
|
| 2320 |
|
This bug will trigger OOM killer if environment variable checking is |
| 2321 |
|
enabled. |
| 2322 |
|
|
| 2323 |
|
Fix 2010/01/17 |
| 2324 |
|
|
| 2325 |
|
@ Use current domain's name for execute_handler audit log. |
| 2326 |
|
|
| 2327 |
|
Since 1.6.7 , /proc/ccs/grant_log was by error using next domain's name |
| 2328 |
|
when auditing current domain's "execute_handler" line. |
| 2329 |
|
|
| 2330 |
|
Fix 2010/03/02 |
| 2331 |
|
|
| 2332 |
|
@ Allow domain transition without execve(). |
| 2333 |
|
|
| 2334 |
|
To be able to split permissions for Apache's CGI programs which are |
| 2335 |
|
executed without execve(), I added special domain transition which is |
| 2336 |
|
performed by atomically writing '\0'-terminated binary string to |
| 2337 |
|
/proc/ccs/.transition interface. For example, a process which belongs to |
| 2338 |
|
"<kernel> /usr/sbin/httpd" domain will transit to |
| 2339 |
|
"<kernel> /usr/sbin/httpd //app=cgi1\040id=10000" domain by atomically |
| 2340 |
|
writing "app=cgi1 id=10000" + '\0' to /proc/ccs/.transition using |
| 2341 |
|
Apache's ap_hook_handler() functionality. |
| 2342 |
|
|
| 2343 |
|
Note that '\0'-terminated binary string is converted to TOMOYO's string |
| 2344 |
|
inside kernel and prefix "//" is automatically added to the string so |
| 2345 |
|
that domainname does not conflict with domainnames created by execve(). |
| 2346 |
|
Without this prefix, if "<kernel> /usr/sbin/sshd /bin/bash" domain is |
| 2347 |
|
allowed to open /proc/ccs/.transition for writing and |
| 2348 |
|
"<kernel> /usr/sbin/sshd /bin/bash /usr/bin/passwd" domain is allowed to |
| 2349 |
|
access /etc/shadow , /bin/bash will be able to access /etc/shadow by |
| 2350 |
|
atomically writing "/usr/bin/passwd" + '\0' to /proc/ccs/.transition . |
| 2351 |
|
Allowing /bin/bash to access /etc/shadow is not what people want. |
| 2352 |
|
|
| 2353 |
|
Permission for this operation is checked by "allow_transit" keyword. |
| 2354 |
|
Unlike "allow_execute" keyword, the string parameter for "allow_transit" |
| 2355 |
|
keyword does not refer a real file on filesystem's namespace. Therefore, |
| 2356 |
|
you can store any combination of parameters like LDAP's DN entry in the |
| 2357 |
|
string parameter for "allow_transit" keyword. |
| 2358 |
|
|
| 2359 |
|
Fix 2010/03/08 |
| 2360 |
|
|
| 2361 |
|
@ Allow building as loadable kernel module. |
| 2362 |
|
|
| 2363 |
|
To be able to minimize filesize increment of vmlinux, I made it |
| 2364 |
|
possible to compile TOMOYO Linux as loadable kernel module. |
| 2365 |
|
Although patching the kernel source and recompiling the kernel are |
| 2366 |
|
inevitable, this change will make it easier to enable TOMOYO Linux |
| 2367 |
|
when there is a filesize limitation on vmlinux (e.g. embedded systems). |
| 2368 |
|
|
| 2369 |
|
Fix 2010/03/21 |
| 2370 |
|
|
| 2371 |
|
@ Improve garbage collector. |
| 2372 |
|
|
| 2373 |
|
Until now, garbage collector did not start garbage collection until |
| 2374 |
|
/proc/ccs/ users call close(). But since it is not good behavior to |
| 2375 |
|
leave the kernel with SRCU read lock held, I changed /proc/ccs/ users |
| 2376 |
|
not to leave the kernel with SRCU read lock held. As a result, garbage |
| 2377 |
|
collector can start garbage collection before /proc/ccs/ users call |
| 2378 |
|
close(). |
| 2379 |
|
|
| 2380 |
|
Fix 2010/03/25 |
| 2381 |
|
|
| 2382 |
|
@ Fix ccs_get_ipv6_address() bug. |
| 2383 |
|
|
| 2384 |
|
Since 1.7.0 , ccs_get_ipv6_address() was by error returning address of |
| 2385 |
|
"struct list_head ccs_address_list" if memory allocation failed. |
| 2386 |
|
As a result, ccs_put_ipv6_address() will modify memory near |
| 2387 |
|
"struct list_head ccs_address_list" if memory allocation failed. |
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