[PATCH 3/4] task_post_setgid()
- Implement the task_post_setgid() LSM hook which is required by
MultiAdmin to switch between classes.
(task_post_setuid also switches between classes -- and already exists)
Signed-off-by: Jan Engelhardt <[EMAIL PROTECTED]>, May 01 2006
Modified July 11 2006
---
include/linux/security.h | 13 +++++++++++++
kernel/sys.c | 15 ++++++++++++---
security/dummy.c | 7 +++++++
3 files changed, 32 insertions(+), 3 deletions(-)
Index: linux-2.6.23.1/include/linux/security.h
===================================================================
--- linux-2.6.23.1.orig/include/linux/security.h
+++ linux-2.6.23.1/include/linux/security.h
@@ -1400,6 +1400,7 @@ struct security_operations {
#endif /* CONFIG_KEYS */
int (*cap_extra)(struct task_struct *, unsigned int);
+ int (*task_post_setgid)(gid_t, gid_t, gid_t, unsigned int);
};
/* global variables */
@@ -2139,6 +2140,12 @@ static inline int security_cap_extra(str
return security_ops->cap_extra(task, cap);
}
+static inline int security_task_post_setgid(gid_t real, gid_t effective,
+ gid_t saved, unsigned int type)
+{
+ return security_ops->task_post_setgid(real, effective, saved, type);
+}
+
/* prototypes */
extern int security_init (void);
extern int register_security (struct security_operations *ops);
@@ -2799,6 +2806,12 @@ static inline int security_cap_extra(str
return 0;
}
+static inline int security_task_post_setgid(gid_t real, gid_t effective,
+ gid_t saved, unsigned int type)
+{
+ return 0;
+}
+
static inline struct dentry *securityfs_create_dir(const char *name,
struct dentry *parent)
{
Index: linux-2.6.23.1/kernel/sys.c
===================================================================
--- linux-2.6.23.1.orig/kernel/sys.c
+++ linux-2.6.23.1/kernel/sys.c
@@ -1052,7 +1052,8 @@ asmlinkage long sys_setregid(gid_t rgid,
current->gid = new_rgid;
key_fsgid_changed(current);
proc_id_connector(current, PROC_EVENT_GID);
- return 0;
+ return security_task_post_setgid(old_rgid, old_egid,
+ (gid_t)-1, LSM_SETID_RE);
}
/*
@@ -1062,6 +1063,7 @@ asmlinkage long sys_setregid(gid_t rgid,
*/
asmlinkage long sys_setgid(gid_t gid)
{
+ gid_t old_rgid = current->gid;
int old_egid = current->egid;
int retval;
@@ -1087,7 +1089,8 @@ asmlinkage long sys_setgid(gid_t gid)
key_fsgid_changed(current);
proc_id_connector(current, PROC_EVENT_GID);
- return 0;
+ return security_task_post_setgid(old_rgid, (gid_t)-1,
+ (gid_t)-1, LSM_SETID_ID);
}
static int set_user(uid_t new_ruid, int dumpclear)
@@ -1290,6 +1293,9 @@ asmlinkage long sys_getresuid(uid_t __us
*/
asmlinkage long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
{
+ gid_t old_rgid = current->gid;
+ gid_t old_egid = current->egid;
+ gid_t old_sgid = current->sgid;
int retval;
retval = security_task_setgid(rgid, egid, sgid, LSM_SETID_RES);
@@ -1322,7 +1328,8 @@ asmlinkage long sys_setresgid(gid_t rgid
key_fsgid_changed(current);
proc_id_connector(current, PROC_EVENT_GID);
- return 0;
+ return security_task_post_setgid(old_rgid, old_egid,
+ old_sgid, LSM_SETID_RES);
}
asmlinkage long sys_getresgid(gid_t __user *rgid, gid_t __user *egid, gid_t
__user *sgid)
@@ -1391,6 +1398,8 @@ asmlinkage long sys_setfsgid(gid_t gid)
key_fsgid_changed(current);
proc_id_connector(current, PROC_EVENT_GID);
}
+ security_task_post_setgid(old_fsgid, (gid_t)-1,
+ (gid_t)-1, LSM_SETID_FS);
return old_fsgid;
}
Index: linux-2.6.23.1/security/dummy.c
===================================================================
--- linux-2.6.23.1.orig/security/dummy.c
+++ linux-2.6.23.1/security/dummy.c
@@ -698,6 +698,12 @@ static int dummy_cap_extra(struct task_s
return 0;
}
+static int dummy_task_post_setgid(gid_t real, gid_t effective,
+ gid_t saved, unsigned int type)
+{
+ return 0;
+}
+
#ifdef CONFIG_SECURITY_NETWORK
static int dummy_unix_stream_connect (struct socket *sock,
struct socket *other,
@@ -1138,5 +1144,6 @@ void security_fixup_ops (struct security
#endif /* CONFIG_KEYS */
set_to_dummy_if_null(ops, cap_extra);
+ set_to_dummy_if_null(ops, task_post_setgid);
}
-
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