drm/i915: Check for dev->primary->master before dereference.

[safe/jmp/linux-2.6] / fs / exec.c

diff --git a/fs/exec.c b/fs/exec.c
index 6b09d6f..b9f1c14 100644 (file)
--- 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>
@@ -99,7 +100,7 @@ static inline void put_binfmt(struct linux_binfmt * fmt)
  *
  * Also note that we take the address to load from from the file itself.
  */
-asmlinkage long sys_uselib(const char __user * library)
+SYSCALL_DEFINE1(uselib, const char __user *, library)
 {
        struct file *file;
        struct nameidata nd;
@@ -127,6 +128,9 @@ asmlinkage long sys_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:
@@ -1686,7 +1715,7 @@ int get_dumpable(struct mm_struct *mm)
        return (ret >= 2) ? 2 : ret;
 }
 
-int do_coredump(long signr, int exit_code, struct pt_regs * regs)
+void do_coredump(long signr, int exit_code, struct pt_regs *regs)
 {
        struct core_state core_state;
        char corename[CORENAME_MAX_SIZE + 1];
@@ -1842,5 +1871,5 @@ fail_unlock:
        put_cred(cred);
        coredump_finish(mm);
 fail:
-       return retval;
+       return;
 }