[PATCH 7/8] exec: simplify the copy_strings_kernel calling convention

[Christoph Hellwig]

copy_strings_kernel is always used with a single argument,
adjust the calling convention to that.

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 fs/binfmt_em86.c        |  6 +++---
 fs/binfmt_misc.c        |  4 ++--
 fs/binfmt_script.c      |  6 +++---
 fs/exec.c               | 13 ++++++-------
 include/linux/binfmts.h |  3 +--
 5 files changed, 15 insertions(+), 17 deletions(-)

diff --git a/fs/binfmt_em86.c b/fs/binfmt_em86.c
index 466497860c62..f33fa668c91f 100644
--- a/fs/binfmt_em86.c
+++ b/fs/binfmt_em86.c
@@ -68,15 +68,15 @@ static int load_em86(struct linux_binprm *bprm)
         * user environment and arguments are stored.
         */
        remove_arg_zero(bprm);
-       retval = copy_strings_kernel(1, &bprm->filename, bprm);
+       retval = copy_string_kernel(bprm->filename, bprm);
        if (retval < 0) return retval; 
        bprm->argc++;
        if (i_arg) {
-               retval = copy_strings_kernel(1, &i_arg, bprm);
+               retval = copy_string_kernel(i_arg, bprm);
                if (retval < 0) return retval; 
                bprm->argc++;
        }
-       retval = copy_strings_kernel(1, &i_name, bprm);
+       retval = copy_string_kernel(i_name, bprm);
        if (retval < 0) return retval;
        bprm->argc++;
 
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index cdb45829354d..b15257d8ff5e 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -190,13 +190,13 @@ static int load_misc_binary(struct linux_binprm *bprm)
                bprm->file = NULL;
        }
        /* make argv[1] be the path to the binary */
-       retval = copy_strings_kernel(1, &bprm->interp, bprm);
+       retval = copy_string_kernel(bprm->interp, bprm);
        if (retval < 0)
                goto error;
        bprm->argc++;
 
        /* add the interp as argv[0] */
-       retval = copy_strings_kernel(1, &fmt->interpreter, bprm);
+       retval = copy_string_kernel(fmt->interpreter, bprm);
        if (retval < 0)
                goto error;
        bprm->argc++;
diff --git a/fs/binfmt_script.c b/fs/binfmt_script.c
index e9e6a6f4a35f..c4fb7f52a46e 100644
--- a/fs/binfmt_script.c
+++ b/fs/binfmt_script.c
@@ -117,17 +117,17 @@ static int load_script(struct linux_binprm *bprm)
        retval = remove_arg_zero(bprm);
        if (retval)
                return retval;
-       retval = copy_strings_kernel(1, &bprm->interp, bprm);
+       retval = copy_string_kernel(bprm->interp, bprm);
        if (retval < 0)
                return retval;
        bprm->argc++;
        if (i_arg) {
-               retval = copy_strings_kernel(1, &i_arg, bprm);
+               retval = copy_string_kernel(i_arg, bprm);
                if (retval < 0)
                        return retval;
                bprm->argc++;
        }
-       retval = copy_strings_kernel(1, &i_name, bprm);
+       retval = copy_string_kernel(i_name, bprm);
        if (retval)
                return retval;
        bprm->argc++;
diff --git a/fs/exec.c b/fs/exec.c
index 06b4c550af5d..b2a77d5acede 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -588,24 +588,23 @@ static int copy_strings(int argc, struct user_arg_ptr 
argv,
 }
 
 /*
- * Like copy_strings, but get argv and its values from kernel memory.
+ * Copy and argument/environment string from the kernel to the processes stack.
  */
-int copy_strings_kernel(int argc, const char *const *__argv,
-                       struct linux_binprm *bprm)
+int copy_string_kernel(const char *arg, struct linux_binprm *bprm)
 {
        int r;
        mm_segment_t oldfs = get_fs();
        struct user_arg_ptr argv = {
-               .ptr.native = (const char __user *const  __user *)__argv,
+               .ptr.native = (const char __user *const  __user *)&arg,
        };
 
        set_fs(KERNEL_DS);
-       r = copy_strings(argc, argv, bprm);
+       r = copy_strings(1, argv, bprm);
        set_fs(oldfs);
 
        return r;
 }
-EXPORT_SYMBOL(copy_strings_kernel);
+EXPORT_SYMBOL(copy_string_kernel);
 
 #ifdef CONFIG_MMU
 
@@ -1863,7 +1862,7 @@ static int __do_execve_file(int fd, struct filename 
*filename,
        if (retval < 0)
                goto out;
 
-       retval = copy_strings_kernel(1, &bprm->filename, bprm);
+       retval = copy_string_kernel(bprm->filename, bprm);
        if (retval < 0)
                goto out;
 
diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h
index a345d9fed3d8..3d3afe094c97 100644
--- a/include/linux/binfmts.h
+++ b/include/linux/binfmts.h
@@ -144,8 +144,7 @@ extern int setup_arg_pages(struct linux_binprm * bprm,
 extern int transfer_args_to_stack(struct linux_binprm *bprm,
                                  unsigned long *sp_location);
 extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm);
-extern int copy_strings_kernel(int argc, const char *const *argv,
-                              struct linux_binprm *bprm);
+int copy_string_kernel(const char *arg, struct linux_binprm *bprm);
 extern void install_exec_creds(struct linux_binprm *bprm);
 extern void set_binfmt(struct linux_binfmt *new);
 extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t);
-- 
2.25.1