linux-kernel - Re: [PATCH v3 09/10] lib/refcount: Remove unused 'refcount_error

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Date:   Thu, 10 Oct 2019 13:50:14 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Will Deacon <will@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Elena Reshetova <elena.reshetova@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Hanjun Guo <guohanjun@...wei.com>,
        Jan Glauber <jglauber@...vell.com>
Subject: Re: [PATCH v3 09/10] lib/refcount: Remove unused
 'refcount_error_report()' function

On Mon, Oct 07, 2019 at 04:47:02PM +0100, Will Deacon wrote:
> 'refcount_error_report()' has no callers. Remove it.

Seems like this could be collapsed into patch 8? Either way:

Acked-by: Kees Cook <keescook@...omium.org>

-Kees

> 
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Elena Reshetova <elena.reshetova@...el.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> Cc: Kees Cook <keescook@...omium.org>
> Signed-off-by: Will Deacon <will@...nel.org>
> ---
>  include/linux/kernel.h |  7 -------
>  kernel/panic.c         | 11 -----------
>  2 files changed, 18 deletions(-)
> 
> diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> index d83d403dac2e..09f759228e3f 100644
> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -328,13 +328,6 @@ extern int oops_may_print(void);
>  void do_exit(long error_code) __noreturn;
>  void complete_and_exit(struct completion *, long) __noreturn;
>  
> -#ifdef CONFIG_ARCH_HAS_REFCOUNT
> -void refcount_error_report(struct pt_regs *regs, const char *err);
> -#else
> -static inline void refcount_error_report(struct pt_regs *regs, const char *err)
> -{ }
> -#endif
> -
>  /* Internal, do not use. */
>  int __must_check _kstrtoul(const char *s, unsigned int base, unsigned long *res);
>  int __must_check _kstrtol(const char *s, unsigned int base, long *res);
> diff --git a/kernel/panic.c b/kernel/panic.c
> index 47e8ebccc22b..10d05fd4f9c3 100644
> --- a/kernel/panic.c
> +++ b/kernel/panic.c
> @@ -670,17 +670,6 @@ EXPORT_SYMBOL(__stack_chk_fail);
>  
>  #endif
>  
> -#ifdef CONFIG_ARCH_HAS_REFCOUNT
> -void refcount_error_report(struct pt_regs *regs, const char *err)
> -{
> -	WARN_RATELIMIT(1, "refcount_t %s at %pB in %s[%d], uid/euid: %u/%u\n",
> -		err, (void *)instruction_pointer(regs),
> -		current->comm, task_pid_nr(current),
> -		from_kuid_munged(&init_user_ns, current_uid()),
> -		from_kuid_munged(&init_user_ns, current_euid()));
> -}
> -#endif
> -
>  core_param(panic, panic_timeout, int, 0644);
>  core_param(panic_print, panic_print, ulong, 0644);
>  core_param(pause_on_oops, pause_on_oops, int, 0644);
> -- 
> 2.23.0.581.g78d2f28ef7-goog
> 

-- 
Kees Cook