linux-hardening - Re: [PATCH v1 1/1] kernel.h: Move lib/cmdline.c prototypes to string.h

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Date: Tue, 3 Oct 2023 16:39:18 -0700
From: Kees Cook <keescook@...omium.org>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
	Andy Shevchenko <andy@...nel.org>
Subject: Re: [PATCH v1 1/1] kernel.h: Move lib/cmdline.c prototypes to
 string.h

On Tue, Oct 03, 2023 at 04:01:42PM +0300, Andy Shevchenko wrote:
> The lib/cmdline.c is basically a set of some small string parsers
> which are wide used in the kernel. Their prototypes belong to the
> string.h rather then kernel.h.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

I think these should live in string_helpers.h not string.h (which is, in
theory, supposed to be used for the standard C string library functions,
though that's not 100% currently)...

-Kees

> ---
>  include/linux/kernel.h | 6 ------
>  include/linux/string.h | 8 ++++++++
>  2 files changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> index c07f9c779d45..3e6c5ac08f8b 100644
> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -195,12 +195,6 @@ static inline void might_fault(void) { }
>  
>  void do_exit(long error_code) __noreturn;
>  
> -extern int get_option(char **str, int *pint);
> -extern char *get_options(const char *str, int nints, int *ints);
> -extern unsigned long long memparse(const char *ptr, char **retptr);
> -extern bool parse_option_str(const char *str, const char *option);
> -extern char *next_arg(char *args, char **param, char **val);
> -
>  extern int core_kernel_text(unsigned long addr);
>  extern int __kernel_text_address(unsigned long addr);
>  extern int kernel_text_address(unsigned long addr);
> diff --git a/include/linux/string.h b/include/linux/string.h
> index 3c920b6d609b..0995f2a737ef 100644
> --- a/include/linux/string.h
> +++ b/include/linux/string.h
> @@ -181,9 +181,17 @@ extern void *kmemdup(const void *src, size_t len, gfp_t gfp) __realloc_size(2);
>  extern void *kvmemdup(const void *src, size_t len, gfp_t gfp) __realloc_size(2);
>  extern char *kmemdup_nul(const char *s, size_t len, gfp_t gfp);
>  
> +/* lib/argv_split.c */
>  extern char **argv_split(gfp_t gfp, const char *str, int *argcp);
>  extern void argv_free(char **argv);
>  
> +/* lib/cmdline.c */
> +extern int get_option(char **str, int *pint);
> +extern char *get_options(const char *str, int nints, int *ints);
> +extern unsigned long long memparse(const char *ptr, char **retptr);
> +extern bool parse_option_str(const char *str, const char *option);
> +extern char *next_arg(char *args, char **param, char **val);
> +
>  extern bool sysfs_streq(const char *s1, const char *s2);
>  int match_string(const char * const *array, size_t n, const char *string);
>  int __sysfs_match_string(const char * const *array, size_t n, const char *s);
> -- 
> 2.40.0.1.gaa8946217a0b
> 

-- 
Kees Cook