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authorLi Zefan <lizf@cn.fujitsu.com>2009-07-29 15:04:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-07-29 19:10:35 -0700
commit096b7fe012d66ed55e98bc8022405ede0cc80e96 (patch)
tree755709b6d3ff21a9e9640d6c19432b31c863ad34 /include/linux
parentb317c833211b7fbf902163de766f09554090e0bf (diff)
cgroups: fix pid namespace bug
The bug was introduced by commit cc31edceee04a7b87f2be48f9489ebb72d264844 ("cgroups: convert tasks file to use a seq_file with shared pid array"). We cache a pid array for all threads that are opening the same "tasks" file, but the pids in the array are always from the namespace of the last process that opened the file, so all other threads will read pids from that namespace instead of their own namespaces. To fix it, we maintain a list of pid arrays, which is keyed by pid_ns. The list will be of length 1 at most time. Reported-by: Paul Menage <menage@google.com> Idea-by: Paul Menage <menage@google.com> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Reviewed-by: Serge Hallyn <serue@us.ibm.com> Cc: Balbir Singh <balbir@in.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/cgroup.h11
1 files changed, 4 insertions, 7 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 665fa70e409..20411d2876f 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -179,14 +179,11 @@ struct cgroup {
*/
struct list_head release_list;
- /* pids_mutex protects the fields below */
+ /* pids_mutex protects pids_list and cached pid arrays. */
struct rw_semaphore pids_mutex;
- /* Array of process ids in the cgroup */
- pid_t *tasks_pids;
- /* How many files are using the current tasks_pids array */
- int pids_use_count;
- /* Length of the current tasks_pids array */
- int pids_length;
+
+ /* Linked list of struct cgroup_pids */
+ struct list_head pids_list;
/* For RCU-protected deletion */
struct rcu_head rcu_head;