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| author | David Howells <dhowells@redhat.com> | 2008-04-29 01:01:31 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-29 08:06:17 -0700 |
| commit | 69664cf16af4f31cd54d77948a4baf9c7e0ca7b9 (patch) | |
| tree | 3ff4ecae21c140a2beed25cfa9e55b788f9814ac /include | |
| parent | 6b79ccb5144f9ffb4d4596c23e7570238dd12abc (diff) | |
| download | lwn-69664cf16af4f31cd54d77948a4baf9c7e0ca7b9.tar.gz lwn-69664cf16af4f31cd54d77948a4baf9c7e0ca7b9.zip | |
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')
| -rw-r--r-- | include/linux/key.h | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/include/linux/key.h b/include/linux/key.h index 8b0bd3393abc..2effd031a817 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 */ |