Hi,
the following patch adds a post_setgid() security hook, and necessary dummy
funcs.
Signed-off-by: Jan Engelhardt <[email protected]>
diff -dpru linux-2.6.13-rc1-git3-20050706140055/include/linux/security.h AS17/include/linux/security.h
--- linux-2.6.13-rc1-git3-20050706140055/include/linux/security.h 2005-07-11 22:16:30.000000000 +0200
+++ AS17/include/linux/security.h 2005-07-14 23:28:45.000000000 +0200
@@ -558,6 +558,17 @@ struct swap_info_struct;
* @id2 contains a gid.
* @flags contains one of the LSM_SETID_* values.
* Return 0 if permission is granted.
+ * @task_post_setgid:
+ * Update the module's state after setting one or more of the user
+ * identity attributes of the current process. The @flags parameter
+ * indicates which of the set*gid system calls invoked this hook. If
+ * @flags is LSM_SETID_FS, then @old_rgid is the old fs gid and the other
+ * parameters are not used.
+ * @old_rgid contains the old real gid (or fs gid if LSM_SETID_FS).
+ * @old_egid contains the old effective gid (or -1 if LSM_SETID_FS).
+ * @old_sgid contains the old saved gid (or -1 if LSM_SETID_FS).
+ * @flags contains one of the LSM_SETID_* values.
+ * Return 0 on success.
* @task_setpgid:
* Check permission before setting the process group identifier of the
* process @p to @pgid.
@@ -1151,6 +1162,7 @@ struct security_operations {
int (*task_post_setuid) (uid_t old_ruid /* or fsuid */ ,
uid_t old_euid, uid_t old_suid, int flags);
int (*task_setgid) (gid_t id0, gid_t id1, gid_t id2, int flags);
+ int (*task_post_setgid) (gid_t, gid_t, gid_t, int);
int (*task_setpgid) (struct task_struct * p, pid_t pgid);
int (*task_getpgid) (struct task_struct * p);
int (*task_getsid) (struct task_struct * p);
@@ -1949,6 +1961,12 @@ static inline int security_task_setgid (
0);
}
+static inline int security_task_post_setgid(gid_t id0, gid_t id1, gid_t id2,
+ int flags)
+{
+ return COND_SECURITY(task_post_setgid(id0, id1, id2, flags), 0);
+}
+
static inline int security_task_setpgid (struct task_struct *p, pid_t pgid)
{
return COND_SECURITY(task_setpgid (p, pgid),
diff -dpru linux-2.6.13-rc1-git3-20050706140055/kernel/sys.c AS17/kernel/sys.c
--- linux-2.6.13-rc1-git3-20050706140055/kernel/sys.c 2005-07-07 20:53:44.000000000 +0200
+++ AS17/kernel/sys.c 2005-07-14 23:23:12.000000000 +0200
@@ -558,7 +558,7 @@ asmlinkage long sys_setregid(gid_t rgid,
current->egid = new_egid;
current->gid = new_rgid;
key_fsgid_changed(current);
- return 0;
+ return security_task_post_setgid(old_rgid, old_egid, -1, LSM_SETID_RE);
}
/*
@@ -597,7 +597,7 @@ asmlinkage long sys_setgid(gid_t gid)
return -EPERM;
key_fsgid_changed(current);
- return 0;
+ return security_task_post_setgid(gid, -1, -1, LSM_SETID_ID);
}
static int set_user(uid_t new_ruid, int dumpclear)
@@ -801,6 +801,9 @@ 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);
@@ -833,7 +836,7 @@ asmlinkage long sys_setresgid(gid_t rgid
current->sgid = sgid;
key_fsgid_changed(current);
- 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)
diff -dpru linux-2.6.13-rc1-git3-20050706140055/security/dummy.c AS17/security/dummy.c
--- linux-2.6.13-rc1-git3-20050706140055/security/dummy.c 2005-07-07 20:53:51.000000000 +0200
+++ AS17/security/dummy.c 2005-07-14 23:26:27.000000000 +0200
@@ -518,6 +518,11 @@ static int dummy_task_setgid (gid_t id0,
return 0;
}
+static int dummy_task_post_setgid(gid_t id0, gid_t id1, gid_t id2, int flags)
+{
+ return 0;
+}
+
static int dummy_task_setpgid (struct task_struct *p, pid_t pgid)
{
return 0;
@@ -931,6 +936,7 @@ void security_fixup_ops (struct security
set_to_dummy_if_null(ops, task_setuid);
set_to_dummy_if_null(ops, task_post_setuid);
set_to_dummy_if_null(ops, task_setgid);
+ set_to_dummy_if_null(ops, task_post_setgid);
set_to_dummy_if_null(ops, task_setpgid);
set_to_dummy_if_null(ops, task_getpgid);
set_to_dummy_if_null(ops, task_getsid);
#eof
Jan Engelhardt
--
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