Re: [PATCH v5 5/6] kprobes: Use text_alloc() and text_free()

[Mike Rapoport]

On Fri, Jul 24, 2020 at 08:05:52AM +0300, Jarkko Sakkinen wrote:
> Use text_alloc() and text_free() instead of module_alloc() and
> module_memfree() when an arch provides them.
> 
> Cc: linux-mm@xxxxxxxxx
> Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
> ---
>  kernel/kprobes.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/kernel/kprobes.c b/kernel/kprobes.c
> index 4e46d96d4e16..611fcda9f6bf 100644
> --- a/kernel/kprobes.c
> +++ b/kernel/kprobes.c
> @@ -40,6 +40,7 @@
>  #include <asm/cacheflush.h>
>  #include <asm/errno.h>
>  #include <linux/uaccess.h>
> +#include <linux/vmalloc.h>
>  
>  #define KPROBE_HASH_BITS 6
>  #define KPROBE_TABLE_SIZE (1 << KPROBE_HASH_BITS)
> @@ -111,12 +112,20 @@ enum kprobe_slot_state {
>  
>  void __weak *alloc_insn_page(void)
>  {
> +#ifdef CONFIG_ARCH_HAS_TEXT_ALLOC
> +	return text_alloc(PAGE_SIZE);
> +#else
>  	return module_alloc(PAGE_SIZE);
> +#endif
>  }
>  
>  void __weak free_insn_page(void *page)
>  {
> +#ifdef CONFIG_ARCH_HAS_TEXT_ALLOC
> +	text_free(page);
> +#else
>  	module_memfree(page);
> +#endif
>  }

Both alloc_insn_page() and free_insn_page() are __weak and can be simple
overriden in arch/x86 code.
  
>  struct kprobe_insn_cache kprobe_insn_slots = {
> -- 
> 2.25.1
> 

-- 
Sincerely yours,
Mike.