path: root/fs/nfsd/vfs.c
diff options
authorDavid Howells <dhowells@redhat.com>2009-09-02 09:13:40 +0100
committerJames Morris <jmorris@namei.org>2009-09-02 21:29:01 +1000
commite0e817392b9acf2c98d3be80c233dddb1b52003d (patch)
treeee680c020039313c9f9c40ab3542bb30a7363381 /fs/nfsd/vfs.c
parented6d76e4c32de0c2ad5f1d572b948ef49e465176 (diff)
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 'fs/nfsd/vfs.c')
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 23341c1063b..8fa09bfbcba 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -684,6 +684,8 @@ nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
__be32 err;
int host_err;
+ validate_process_creds();
* If we get here, then the client has already done an "open",
* and (hopefully) checked permission - so allow OWNER_OVERRIDE
@@ -740,6 +742,7 @@ nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
err = nfserrno(host_err);
+ validate_process_creds();
return err;