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authorDavid Howells <dhowells@redhat.com>2009-09-02 10:13:40 +0200
committerJames Morris <jmorris@namei.org>2009-09-02 13:29:01 +0200
commite0e817392b9acf2c98d3be80c233dddb1b52003d (patch)
treeee680c020039313c9f9c40ab3542bb30a7363381 /kernel/exit.c
parentselinux: Support for the new TUN LSM hooks (diff)
downloadlinux-e0e817392b9acf2c98d3be80c233dddb1b52003d.tar.xz
linux-e0e817392b9acf2c98d3be80c233dddb1b52003d.zip
CRED: Add some configurable debugging [try #6]
Add a config option (CONFIG_DEBUG_CREDENTIALS) to turn on some debug checking for credential management. The additional code keeps track of the number of pointers from task_structs to any given cred struct, and checks to see that this number never exceeds the usage count of the cred struct (which includes all references, not just those from task_structs). Furthermore, if SELinux is enabled, the code also checks that the security pointer in the cred struct is never seen to be invalid. This attempts to catch the bug whereby inode_has_perm() faults in an nfsd kernel thread on seeing cred->security be a NULL pointer (it appears that the credential struct has been previously released): http://www.kerneloops.org/oops.php?number=252883 Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'kernel/exit.c')
-rw-r--r--kernel/exit.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index 869dc221733e..c98ff7a8025f 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -901,6 +901,8 @@ NORET_TYPE void do_exit(long code)
tracehook_report_exit(&code);
+ validate_creds_for_do_exit(tsk);
+
/*
* We're taking recursive faults here in do_exit. Safest is to just
* leave this task alone and wait for reboot.
@@ -1009,6 +1011,8 @@ NORET_TYPE void do_exit(long code)
if (tsk->splice_pipe)
__free_pipe_info(tsk->splice_pipe);
+ validate_creds_for_do_exit(tsk);
+
preempt_disable();
/* causes final put_task_struct in finish_task_switch(). */
tsk->state = TASK_DEAD;