generic kernel_execve()

[mirror_ubuntu-artful-kernel.git] / fs / exec.c

diff --git a/fs/exec.c b/fs/exec.c
index 3684353ebd5f612a82f7e8981fb2ce80441e8565..48c525115fe4d8a71d0a8716354f57e0bf19eed6 100644 (file)
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -59,7 +59,6 @@
 #include <asm/uaccess.h>
 #include <asm/mmu_context.h>
 #include <asm/tlb.h>
-#include <asm/exec.h>
 
 #include <trace/events/task.h>
 #include "internal.h"
@@ -2069,25 +2068,18 @@ static void wait_for_dump_helpers(struct file *file)
  */
 static int umh_pipe_setup(struct subprocess_info *info, struct cred *new)
 {
-       struct file *rp, *wp;
+       struct file *files[2];
        struct fdtable *fdt;
        struct coredump_params *cp = (struct coredump_params *)info->data;
        struct files_struct *cf = current->files;
+       int err = create_pipe_files(files, 0);
+       if (err)
+               return err;
 
-       wp = create_write_pipe(0);
-       if (IS_ERR(wp))
-               return PTR_ERR(wp);
-
-       rp = create_read_pipe(wp, 0);
-       if (IS_ERR(rp)) {
-               free_write_pipe(wp);
-               return PTR_ERR(rp);
-       }
-
-       cp->file = wp;
+       cp->file = files[1];
 
        sys_close(0);
-       fd_install(0, rp);
+       fd_install(0, files[0]);
        spin_lock(&cf->file_lock);
        fdt = files_fdtable(cf);
        __set_open_fd(0, fdt);
@@ -2326,3 +2318,25 @@ int dump_seek(struct file *file, loff_t off)
        return ret;
 }
 EXPORT_SYMBOL(dump_seek);
+
+#ifdef __ARCH_WANT_KERNEL_EXECVE
+int kernel_execve(const char *filename,
+                 const char *const argv[],
+                 const char *const envp[])
+{
+       struct pt_regs *p = current_pt_regs();
+       int ret;
+
+       ret = do_execve(filename,
+                       (const char __user *const __user *)argv,
+                       (const char __user *const __user *)envp, p);
+       if (ret < 0)
+               return ret;
+
+       /*
+        * We were successful.  We won't be returning to our caller, but
+        * instead to user space by manipulating the kernel stack.
+        */
+       ret_from_kernel_execve(p);
+}
+#endif