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authorDavid Howells <dhowells@redhat.com>2012-10-02 19:24:29 +0100
committerDavid Howells <dhowells@redhat.com>2012-10-02 19:24:29 +0100
commit3a50597de8635cd05133bd12c95681c82fe7b878 (patch)
treed81c3e46dcef80fbaf84fdf1e8f43676625bab8e /security/keys/keyctl.c
parenta84a921978b7d56e0e4b87ffaca6367429b4d8ff (diff)
downloadlinaro-lsk-3a50597de8635cd05133bd12c95681c82fe7b878.tar.gz
KEYS: Make the session and process keyrings per-thread
Make the session keyring per-thread rather than per-process, but still inherited from the parent thread to solve a problem with PAM and gdm. The problem is that join_session_keyring() will reject attempts to change the session keyring of a multithreaded program but gdm is now multithreaded before it gets to the point of starting PAM and running pam_keyinit to create the session keyring. See: https://bugs.freedesktop.org/show_bug.cgi?id=49211 The reason that join_session_keyring() will only change the session keyring under a single-threaded environment is that it's hard to alter the other thread's credentials to effect the change in a multi-threaded program. The problems are such as: (1) How to prevent two threads both running join_session_keyring() from racing. (2) Another thread's credentials may not be modified directly by this process. (3) The number of threads is uncertain whilst we're not holding the appropriate spinlock, making preallocation slightly tricky. (4) We could use TIF_NOTIFY_RESUME and key_replace_session_keyring() to get another thread to replace its keyring, but that means preallocating for each thread. A reasonable way around this is to make the session keyring per-thread rather than per-process and just document that if you want a common session keyring, you must get it before you spawn any threads - which is the current situation anyway. Whilst we're at it, we can the process keyring behave in the same way. This means we can clean up some of the ickyness in the creds code. Basically, after this patch, the session, process and thread keyrings are about inheritance rules only and not about sharing changes of keyring. Reported-by: Mantas M. <grawity@gmail.com> Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Ray Strode <rstrode@redhat.com>
Diffstat (limited to 'security/keys/keyctl.c')
-rw-r--r--security/keys/keyctl.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index a0d373f7681..65b38417c21 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -1475,7 +1475,8 @@ long keyctl_session_to_parent(void)
goto error_keyring;
newwork = &cred->rcu;
- cred->tgcred->session_keyring = key_ref_to_ptr(keyring_r);
+ cred->session_keyring = key_ref_to_ptr(keyring_r);
+ keyring_r = NULL;
init_task_work(newwork, key_change_session_keyring);
me = current;
@@ -1500,7 +1501,7 @@ long keyctl_session_to_parent(void)
mycred = current_cred();
pcred = __task_cred(parent);
if (mycred == pcred ||
- mycred->tgcred->session_keyring == pcred->tgcred->session_keyring) {
+ mycred->session_keyring == pcred->session_keyring) {
ret = 0;
goto unlock;
}
@@ -1516,9 +1517,9 @@ long keyctl_session_to_parent(void)
goto unlock;
/* the keyrings must have the same UID */
- if ((pcred->tgcred->session_keyring &&
- pcred->tgcred->session_keyring->uid != mycred->euid) ||
- mycred->tgcred->session_keyring->uid != mycred->euid)
+ if ((pcred->session_keyring &&
+ pcred->session_keyring->uid != mycred->euid) ||
+ mycred->session_keyring->uid != mycred->euid)
goto unlock;
/* cancel an already pending keyring replacement */