Messages in this thread Patch in this message | | | Subject | (patch 1/3) lsm: add control over /proc/<pid> visibility | From | Serge Hallyn <> | Date | Wed, 06 Oct 2004 15:21:44 -0500 |
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Attached is a patch which introduces a new LSM hook, security_task_lookup. This hook allows an LSM to mediate visibility of /proc/<pid> on a per-pid level. The bsdjail lsm which will be sent next is a user of this hook.
Please apply.
Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
diff -Nrup linux-2.6.9-rc3-bk6/fs/proc/base.c linux-2.6.9-rc3-bk6-jail/fs/proc/base.c --- linux-2.6.9-rc3-bk6/fs/proc/base.c 2004-10-06 10:07:55.000000000 -0500 +++ linux-2.6.9-rc3-bk6-jail/fs/proc/base.c 2004-10-06 10:51:04.000000000 -0500 @@ -1683,6 +1683,8 @@ static int get_tgid_list(int index, unsi int tgid = p->pid; if (!pid_alive(p)) continue; + if (security_task_lookup(p)) + continue; if (--index >= 0) continue; tgids[nr_tgids] = tgid; diff -Nrup linux-2.6.9-rc3-bk6/include/linux/security.h linux-2.6.9-rc3-bk6-jail/include/linux/security.h --- linux-2.6.9-rc3-bk6/include/linux/security.h 2004-08-14 00:37:30.000000000 -0500 +++ linux-2.6.9-rc3-bk6-jail/include/linux/security.h 2004-10-06 10:51:04.000000000 -0500 @@ -627,6 +627,11 @@ struct swap_info_struct; * Set the security attributes in @p->security for a kernel thread that * is being reparented to the init task. * @p contains the task_struct for the kernel thread. + * @task_lookup: + * Check permission to see the /proc/<pid> entry for process @p. + * @p contains the task_struct for task <pid> which is being looked + * up under /proc + * return 0 if permission is granted. * @task_to_inode: * Set the security attributes for an inode based on an associated task's * security attributes, e.g. for /proc/pid inodes. @@ -1152,6 +1157,7 @@ struct security_operations { unsigned long arg3, unsigned long arg4, unsigned long arg5); void (*task_reparent_to_init) (struct task_struct * p); + int (*task_lookup)(struct task_struct *p); void (*task_to_inode)(struct task_struct *p, struct inode *inode); int (*ipc_permission) (struct kern_ipc_perm * ipcp, short flag); @@ -1751,6 +1757,11 @@ static inline void security_task_reparen security_ops->task_reparent_to_init (p); } +static inline int security_task_lookup(struct task_struct *p) +{ + return security_ops->task_lookup(p); +} + static inline void security_task_to_inode(struct task_struct *p, struct inode *inode) { security_ops->task_to_inode(p, inode); @@ -2386,6 +2397,11 @@ static inline void security_task_reparen cap_task_reparent_to_init (p); } +static inline int security_task_lookup(struct task_struct *p) +{ + return 0; +} + static inline void security_task_to_inode(struct task_struct *p, struct inode *inode) { } diff -Nrup linux-2.6.9-rc3-bk6/security/dummy.c linux-2.6.9-rc3-bk6-jail/security/dummy.c --- linux-2.6.9-rc3-bk6/security/dummy.c 2004-10-06 10:11:29.000000000 -0500 +++ linux-2.6.9-rc3-bk6-jail/security/dummy.c 2004-10-06 10:51:04.000000000 -0500 @@ -616,6 +616,11 @@ static void dummy_task_reparent_to_init return; } +static int dummy_task_lookup(struct task_struct *p) +{ + return 0; +} + static void dummy_task_to_inode(struct task_struct *p, struct inode *inode) { } @@ -978,6 +983,7 @@ void security_fixup_ops (struct security set_to_dummy_if_null(ops, task_kill); set_to_dummy_if_null(ops, task_prctl); set_to_dummy_if_null(ops, task_reparent_to_init); + set_to_dummy_if_null(ops, task_lookup); set_to_dummy_if_null(ops, task_to_inode); set_to_dummy_if_null(ops, ipc_permission); set_to_dummy_if_null(ops, msg_msg_alloc_security);
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