sanitize audit_socketcall

* don't bother with allocations
* now that it can't fail, make it return void

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

3 files changed, 41 insertions, 33 deletions

diff --git a/include/linux/audit.h b/include/linux/audit.h
index 26c4f6f65a46..466a953d4bf6 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -446,7 +446,7 @@ extern void audit_log_task_context(struct audit_buffer *ab);
 extern int __audit_ipc_obj(struct kern_ipc_perm *ipcp);
 extern int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode);
 extern int audit_bprm(struct linux_binprm *bprm);
-extern int audit_socketcall(int nargs, unsigned long *args);
+extern void audit_socketcall(int nargs, unsigned long *args);
 extern int audit_sockaddr(int len, void *addr);
 extern int __audit_fd_pair(int fd1, int fd2);
 extern int audit_set_macxattr(const char *name);
@@ -549,7 +549,7 @@ extern int audit_signals;
 #define audit_ipc_obj(i) ({ 0; })
 #define audit_ipc_set_perm(q,u,g,m) ({ 0; })
 #define audit_bprm(p) ({ 0; })
-#define audit_socketcall(n,a) ({ 0; })
+#define audit_socketcall(n,a) ((void)0)
 #define audit_fd_pair(n,a) ({ 0; })
 #define audit_sockaddr(len, addr) ({ 0; })
 #define audit_set_macxattr(n) do { ; } while (0)
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index c2e43ebb1b68..5cda66466e14 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -168,12 +168,6 @@ struct audit_aux_data_execve {
         struct mm_struct *mm;
 };
 
-struct audit_aux_data_socketcall {
-        struct audit_aux_data   d;
-        int                     nargs;
-        unsigned long           args[0];
-};
-
 struct audit_aux_data_fd_pair {
         struct  audit_aux_data d;
         int     fd[2];
@@ -247,6 +241,14 @@ struct audit_context {
         struct audit_tree_refs *trees, *first_trees;
         int tree_count;
 
+        int type;
+        union {
+                struct {
+                        int nargs;
+                        long args[6];
+                } socketcall;
+        };
+
 #if AUDIT_DEBUG
         int                 put_count;
         int                 ino_count;
@@ -1226,6 +1228,27 @@ static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
                 audit_log_format(ab, " cap_fe=%d cap_fver=%x", name->fcap.fE, name->fcap_ver);
 }
 
+static void show_special(struct audit_context *context)
+{
+        struct audit_buffer *ab;
+        int i;
+
+        ab = audit_log_start(context, GFP_KERNEL, context->type);
+        if (!ab)
+                return;
+
+        switch (context->type) {
+        case AUDIT_SOCKETCALL: {
+                int nargs = context->socketcall.nargs;
+                audit_log_format(ab, "nargs=%d", nargs);
+                for (i = 0; i < nargs; i++)
+                        audit_log_format(ab, " a%d=%lx", i,
+                                context->socketcall.args[i]);
+                break; }
+        }
+        audit_log_end(ab);
+}
+
 static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
 {
         const struct cred *cred;
@@ -1372,13 +1395,6 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
                         audit_log_execve_info(context, &ab, axi);
                         break; }
 
-                case AUDIT_SOCKETCALL: {
-                        struct audit_aux_data_socketcall *axs = (void *)aux;
-                        audit_log_format(ab, "nargs=%d", axs->nargs);
-                        for (i=0; i<axs->nargs; i++)
-                                audit_log_format(ab, " a%d=%lx", i, axs->args[i]);
-                        break; }
-
                 case AUDIT_FD_PAIR: {
                         struct audit_aux_data_fd_pair *axs = (void *)aux;
                         audit_log_format(ab, "fd0=%d fd1=%d", axs->fd[0], axs->fd[1]);
@@ -1410,6 +1426,9 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
                 audit_log_end(ab);
         }
 
+        if (context->type)
+                show_special(context);
+
         if (context->sockaddr_len) {
                 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR);
                 if (ab) {
@@ -1689,6 +1708,7 @@ void audit_syscall_exit(int valid, long return_code)
                 context->target_pid = 0;
                 context->target_sid = 0;
                 context->sockaddr_len = 0;
+                context->type = 0;
                 kfree(context->filterkey);
                 context->filterkey = NULL;
                 tsk->audit_context = context;
@@ -2406,27 +2426,17 @@ int audit_bprm(struct linux_binprm *bprm)
  * @nargs: number of args
  * @args: args array
  *
- * Returns 0 for success or NULL context or < 0 on error.
  */
-int audit_socketcall(int nargs, unsigned long *args)
+void audit_socketcall(int nargs, unsigned long *args)
 {
-        struct audit_aux_data_socketcall *ax;
         struct audit_context *context = current->audit_context;
 
         if (likely(!context || context->dummy))
-                return 0;
-
-        ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL);
-        if (!ax)
-                return -ENOMEM;
-
-        ax->nargs = nargs;
-        memcpy(ax->args, args, nargs * sizeof(unsigned long));
+                return;
 
-        ax->d.type = AUDIT_SOCKETCALL;
-        ax->d.next = context->aux;
-        context->aux = (void *)ax;
-        return 0;
+        context->type = AUDIT_SOCKETCALL;
+        context->socketcall.nargs = nargs;
+        memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long));
 }
 
 /**
diff --git a/net/socket.c b/net/socket.c
index 2c730fc718ab..b41a92093e40 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -2065,9 +2065,7 @@ asmlinkage long sys_socketcall(int call, unsigned long __user *args)
         if (copy_from_user(a, args, nargs[call]))
                 return -EFAULT;
 
-        err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
-        if (err)
-                return err;
+        audit_socketcall(nargs[call] / sizeof(unsigned long), a);
 
         a0 = a[0];
         a1 = a[1];