generic sys_execve()

Selected by __ARCH_WANT_SYS_EXECVE in unistd.h.  Requires
	* working current_pt_regs()
	* *NOT* doing a syscall-in-kernel kind of kernel_execve()
implementation.  Using generic kernel_execve() is fine.

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

1 files changed, 34 insertions, 4 deletions

diff --git a/fs/exec.c b/fs/exec.c
index 48c525115fe4..50a1270da95b 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -401,7 +401,7 @@ struct user_arg_ptr {
         union {
                 const char __user *const __user *native;
 #ifdef CONFIG_COMPAT
-                compat_uptr_t __user *compat;
+                const compat_uptr_t __user *compat;
 #endif
         } ptr;
 };
@@ -1600,9 +1600,9 @@ int do_execve(const char *filename,
 }
 
 #ifdef CONFIG_COMPAT
-int compat_do_execve(char *filename,
-        compat_uptr_t __user *__argv,
-        compat_uptr_t __user *__envp,
+int compat_do_execve(const char *filename,
+        const compat_uptr_t __user *__argv,
+        const compat_uptr_t __user *__envp,
         struct pt_regs *regs)
 {
         struct user_arg_ptr argv = {
@@ -2319,6 +2319,36 @@ int dump_seek(struct file *file, loff_t off)
 }
 EXPORT_SYMBOL(dump_seek);
 
+#ifdef __ARCH_WANT_SYS_EXECVE
+SYSCALL_DEFINE3(execve,
+                const char __user *, filename,
+                const char __user *const __user *, argv,
+                const char __user *const __user *, envp)
+{
+        const char *path = getname(filename);
+        int error = PTR_ERR(path);
+        if (!IS_ERR(path)) {
+                error = do_execve(path, argv, envp, current_pt_regs());
+                putname(path);
+        }
+        return error;
+}
+#ifdef CONFIG_COMPAT
+asmlinkage long compat_sys_execve(const char __user * filename,
+        const compat_uptr_t __user * argv,
+        const compat_uptr_t __user * envp)
+{
+        const char *path = getname(filename);
+        int error = PTR_ERR(path);
+        if (!IS_ERR(path)) {
+                error = compat_do_execve(path, argv, envp, current_pt_regs());
+                putname(path);
+        }
+        return error;
+}
+#endif
+#endif
+
 #ifdef __ARCH_WANT_KERNEL_EXECVE
 int kernel_execve(const char *filename,
                   const char *const argv[],