1 files changed, 35 insertions, 6 deletions

diff --git a/fs/exec.c b/fs/exec.c
index 0dd60a01f1b4..b9f1c144b7a1 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -45,6 +45,7 @@
 #include <linux/proc_fs.h>
 #include <linux/mount.h>
 #include <linux/security.h>
+#include <linux/ima.h>
 #include <linux/syscalls.h>
 #include <linux/tsacct_kern.h>
 #include <linux/cn_proc.h>
@@ -127,6 +128,9 @@ SYSCALL_DEFINE1(uselib, const char __user *, library)
                                  MAY_READ | MAY_EXEC | MAY_OPEN);
         if (error)
                 goto exit;
+        error = ima_path_check(&nd.path, MAY_READ | MAY_EXEC | MAY_OPEN);
+        if (error)
+                goto exit;
 
         file = nameidata_to_filp(&nd, O_RDONLY|O_LARGEFILE);
         error = PTR_ERR(file);
@@ -674,6 +678,9 @@ struct file *open_exec(const char *name)
         err = inode_permission(nd.path.dentry->d_inode, MAY_EXEC | MAY_OPEN);
         if (err)
                 goto out_path_put;
+        err = ima_path_check(&nd.path, MAY_EXEC | MAY_OPEN);
+        if (err)
+                goto out_path_put;
 
         file = nameidata_to_filp(&nd, O_RDONLY|O_LARGEFILE);
         if (IS_ERR(file))
@@ -1049,16 +1056,32 @@ EXPORT_SYMBOL(install_exec_creds);
  * - the caller must hold current->cred_exec_mutex to protect against
  *   PTRACE_ATTACH
  */
-void check_unsafe_exec(struct linux_binprm *bprm)
+void check_unsafe_exec(struct linux_binprm *bprm, struct files_struct *files)
 {
-        struct task_struct *p = current;
+        struct task_struct *p = current, *t;
+        unsigned long flags;
+        unsigned n_fs, n_files, n_sighand;
 
         bprm->unsafe = tracehook_unsafe_exec(p);
 
-        if (atomic_read(&p->fs->count) > 1 ||
-            atomic_read(&p->files->count) > 1 ||
-            atomic_read(&p->sighand->count) > 1)
+        n_fs = 1;
+        n_files = 1;
+        n_sighand = 1;
+        lock_task_sighand(p, &flags);
+        for (t = next_thread(p); t != p; t = next_thread(t)) {
+                if (t->fs == p->fs)
+                        n_fs++;
+                if (t->files == files)
+                        n_files++;
+                n_sighand++;
+        }
+
+        if (atomic_read(&p->fs->count) > n_fs ||
+            atomic_read(&p->files->count) > n_files ||
+            atomic_read(&p->sighand->count) > n_sighand)
                 bprm->unsafe |= LSM_UNSAFE_SHARE;
+
+        unlock_task_sighand(p, &flags);
 }
 
 /* 
@@ -1168,6 +1191,9 @@ int search_binary_handler(struct linux_binprm *bprm,struct pt_regs *regs)
         retval = security_bprm_check(bprm);
         if (retval)
                 return retval;
+        retval = ima_bprm_check(bprm);
+        if (retval)
+                return retval;
 
         /* kernel module loader fixup */
         /* so we don't try to load run modprobe in kernel space. */
@@ -1268,12 +1294,13 @@ int do_execve(char * filename,
         retval = mutex_lock_interruptible(&current->cred_exec_mutex);
         if (retval < 0)
                 goto out_free;
+        current->in_execve = 1;
 
         retval = -ENOMEM;
         bprm->cred = prepare_exec_creds();
         if (!bprm->cred)
                 goto out_unlock;
-        check_unsafe_exec(bprm);
+        check_unsafe_exec(bprm, displaced);
 
         file = open_exec(filename);
         retval = PTR_ERR(file);
@@ -1321,6 +1348,7 @@ int do_execve(char * filename,
                 goto out;
 
         /* execve succeeded */
+        current->in_execve = 0;
         mutex_unlock(&current->cred_exec_mutex);
         acct_update_integrals(current);
         free_bprm(bprm);
@@ -1339,6 +1367,7 @@ out_file:
         }
 
 out_unlock:
+        current->in_execve = 0;
         mutex_unlock(&current->cred_exec_mutex);
 
 out_free: