Subject: Re: [PATCH v3 11/12] lkdtm: Fix execute_[user]_location()

From: Kees Cook <[email-masked]>
Date: Thu, 10 Feb 2022 17:01:07 -0800

On Sun, Oct 17, 2021 at 02:38:24PM +0200, Christophe Leroy wrote:
> execute_location() and execute_user_location() intent
> to copy do_nothing() text and execute it at a new location.
> However, at the time being it doesn't copy do_nothing() function
> but do_nothing() function descriptor which still points to the
> original text. So at the end it still executes do_nothing() at
> its original location allthough using a copied function descriptor.
> 
> So, fix that by really copying do_nothing() text and build a new
> function descriptor by copying do_nothing() function descriptor and
> updating the target address with the new location.
> 
> Also fix the displayed addresses by dereferencing do_nothing()
> function descriptor.
> 
> Signed-off-by: Christophe Leroy <[email-masked]>

This looks good. I might rename variables in the future (e.g. to avoid
the churn from adding _text) but also, that does help keep it clear. :)

Acked-by: Kees Cook <[email-masked]>

-Kees

> ---
>  drivers/misc/lkdtm/perms.c | 37 ++++++++++++++++++++++++++++---------
>  1 file changed, 28 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/misc/lkdtm/perms.c b/drivers/misc/lkdtm/perms.c
> index 035fcca441f0..1cf24c4a79e9 100644
> --- a/drivers/misc/lkdtm/perms.c
> +++ b/drivers/misc/lkdtm/perms.c
> @@ -44,19 +44,34 @@ static noinline void do_overwritten(void)
>  	return;
>  }
>  
> +static void *setup_function_descriptor(func_desc_t *fdesc, void *dst)
> +{
> +	if (!have_function_descriptors())
> +		return dst;
> +
> +	memcpy(fdesc, do_nothing, sizeof(*fdesc));
> +	fdesc->addr = (unsigned long)dst;
> +	barrier();
> +
> +	return fdesc;
> +}
> +
>  static noinline void execute_location(void *dst, bool write)
>  {
> -	void (*func)(void) = dst;
> +	void (*func)(void);
> +	func_desc_t fdesc;
> +	void *do_nothing_text = dereference_function_descriptor(do_nothing);
>  
> -	pr_info("attempting ok execution at %px\n", do_nothing);
> +	pr_info("attempting ok execution at %px\n", do_nothing_text);
>  	do_nothing();
>  
>  	if (write == CODE_WRITE) {
> -		memcpy(dst, do_nothing, EXEC_SIZE);
> +		memcpy(dst, do_nothing_text, EXEC_SIZE);
>  		flush_icache_range((unsigned long)dst,
>  				   (unsigned long)dst + EXEC_SIZE);
>  	}
> -	pr_info("attempting bad execution at %px\n", func);
> +	pr_info("attempting bad execution at %px\n", dst);
> +	func = setup_function_descriptor(&fdesc, dst);
>  	func();
>  	pr_err("FAIL: func returned\n");
>  }
> @@ -66,16 +81,19 @@ static void execute_user_location(void *dst)
>  	int copied;
>  
>  	/* Intentionally crossing kernel/user memory boundary. */
> -	void (*func)(void) = dst;
> +	void (*func)(void);
> +	func_desc_t fdesc;
> +	void *do_nothing_text = dereference_function_descriptor(do_nothing);
>  
> -	pr_info("attempting ok execution at %px\n", do_nothing);
> +	pr_info("attempting ok execution at %px\n", do_nothing_text);
>  	do_nothing();
>  
> -	copied = access_process_vm(current, (unsigned long)dst, do_nothing,
> +	copied = access_process_vm(current, (unsigned long)dst, do_nothing_text,
>  				   EXEC_SIZE, FOLL_WRITE);
>  	if (copied < EXEC_SIZE)
>  		return;
> -	pr_info("attempting bad execution at %px\n", func);
> +	pr_info("attempting bad execution at %px\n", dst);
> +	func = setup_function_descriptor(&fdesc, dst);
>  	func();
>  	pr_err("FAIL: func returned\n");
>  }
> @@ -153,7 +171,8 @@ void lkdtm_EXEC_VMALLOC(void)
>  
>  void lkdtm_EXEC_RODATA(void)
>  {
> -	execute_location(lkdtm_rodata_do_nothing, CODE_AS_IS);
> +	execute_location(dereference_function_descriptor(lkdtm_rodata_do_nothing),
> +			 CODE_AS_IS);
>  }
>  
>  void lkdtm_EXEC_USERSPACE(void)
> -- 
> 2.31.1
> 

-- 
Kees Cook