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authorDavid Howells <dhowells@redhat.com>2008-04-29 01:01:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-29 08:06:17 -0700
commit69664cf16af4f31cd54d77948a4baf9c7e0ca7b9 (patch)
tree3ff4ecae21c140a2beed25cfa9e55b788f9814ac /include/linux
parent6b79ccb5144f9ffb4d4596c23e7570238dd12abc (diff)
keys: don't generate user and user session keyrings unless they're accessed
Don't generate the per-UID user and user session keyrings unless they're explicitly accessed. This solves a problem during a login process whereby set*uid() is called before the SELinux PAM module, resulting in the per-UID keyrings having the wrong security labels. This also cures the problem of multiple per-UID keyrings sometimes appearing due to PAM modules (including pam_keyinit) setuiding and causing user_structs to come into and go out of existence whilst the session keyring pins the user keyring. This is achieved by first searching for extant per-UID keyrings before inventing new ones. The serial bound argument is also dropped from find_keyring_by_name() as it's not currently made use of (setting it to 0 disables the feature). Signed-off-by: David Howells <dhowells@redhat.com> Cc: <kwc@citi.umich.edu> Cc: <arunsr@cse.iitk.ac.in> Cc: <dwalsh@redhat.com> Cc: Stephen Smalley <sds@tycho.nsa.gov> Cc: James Morris <jmorris@namei.org> Cc: Chris Wright <chrisw@sous-sol.org> 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/key.h8
1 files changed, 0 insertions, 8 deletions
diff --git a/include/linux/key.h b/include/linux/key.h
index 8b0bd3393ab..2effd031a81 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -268,9 +268,6 @@ extern struct key *key_lookup(key_serial_t id);
/*
* the userspace interface
*/
-extern struct key root_user_keyring, root_session_keyring;
-extern int alloc_uid_keyring(struct user_struct *user,
- struct task_struct *ctx);
extern void switch_uid_keyring(struct user_struct *new_user);
extern int copy_keys(unsigned long clone_flags, struct task_struct *tsk);
extern int copy_thread_group_keys(struct task_struct *tsk);
@@ -299,7 +296,6 @@ extern void key_init(void);
#define make_key_ref(k, p) ({ NULL; })
#define key_ref_to_ptr(k) ({ NULL; })
#define is_key_possessed(k) 0
-#define alloc_uid_keyring(u,c) 0
#define switch_uid_keyring(u) do { } while(0)
#define __install_session_keyring(t, k) ({ NULL; })
#define copy_keys(f,t) 0
@@ -312,10 +308,6 @@ extern void key_init(void);
#define key_fsgid_changed(t) do { } while(0)
#define key_init() do { } while(0)
-/* Initial keyrings */
-extern struct key root_user_keyring;
-extern struct key root_session_keyring;
-
#endif /* CONFIG_KEYS */
#endif /* __KERNEL__ */
#endif /* _LINUX_KEY_H */