netdev - Re: [net-next RESEND v2] net: core: use shared sysctl macro

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Date:   Thu,  7 Apr 2022 14:50:06 +0200
From:   Alexander Lobakin <alexandr.lobakin@...el.com>
To:     xiangxia.m.yue@...il.com
Cc:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        netdev@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Simon Horman <horms@...ge.net.au>,
        Julian Anastasov <ja@....bg>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Lorenz Bauer <lmb@...udflare.com>,
        Akhmat Karakotov <hmukos@...dex-team.ru>
Subject: Re: [net-next RESEND v2] net: core: use shared sysctl macro

From: xiangxia.m.yue@...il.com
Date: Wed,  6 Apr 2022 20:42:08 +0800

> From: Tonghao Zhang <xiangxia.m.yue@...il.com>
> 
> This patch introdues the SYSCTL_THREE, and replace the
> two, three and long_one to SYSCTL_XXX accordingly.
> 
>  KUnit:
>  [23:03:58] ================ sysctl_test (10 subtests) =================
>  [23:03:58] [PASSED] sysctl_test_api_dointvec_null_tbl_data
>  [23:03:58] [PASSED] sysctl_test_api_dointvec_table_maxlen_unset
>  [23:03:58] [PASSED] sysctl_test_api_dointvec_table_len_is_zero
>  [23:03:58] [PASSED] sysctl_test_api_dointvec_table_read_but_position_set
>  [23:03:58] [PASSED] sysctl_test_dointvec_read_happy_single_positive
>  [23:03:58] [PASSED] sysctl_test_dointvec_read_happy_single_negative
>  [23:03:58] [PASSED] sysctl_test_dointvec_write_happy_single_positive
>  [23:03:58] [PASSED] sysctl_test_dointvec_write_happy_single_negative
>  [23:03:58] [PASSED] sysctl_test_api_dointvec_write_single_less_int_min
>  [23:03:58] [PASSED] sysctl_test_api_dointvec_write_single_greater_int_max
>  [23:03:58] =================== [PASSED] sysctl_test ===================
> 
>  ./run_kselftest.sh -c sysctl
>  ...

--- 8< ---

> diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
> index 7d9cfc730bd4..0bdd9249666b 100644
> --- a/fs/proc/proc_sysctl.c
> +++ b/fs/proc/proc_sysctl.c
> @@ -26,7 +26,7 @@ static const struct file_operations proc_sys_dir_file_operations;
>  static const struct inode_operations proc_sys_dir_operations;
>  
>  /* shared constants to be used in various sysctls */
> -const int sysctl_vals[] = { -1, 0, 1, 2, 4, 100, 200, 1000, 3000, INT_MAX, 65535 };
> +const int sysctl_vals[] = { -1, 0, 1, 2, 3, 4, 100, 200, 1000, 3000, INT_MAX, 65535 };
>  EXPORT_SYMBOL(sysctl_vals);
>  
>  const unsigned long sysctl_long_vals[] = { 0, 1, LONG_MAX };
> diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
> index 6353d6db69b2..b2ac6542455f 100644
> --- a/include/linux/sysctl.h
> +++ b/include/linux/sysctl.h
> @@ -42,12 +42,13 @@ struct ctl_dir;
>  #define SYSCTL_ZERO			((void *)&sysctl_vals[1])
>  #define SYSCTL_ONE			((void *)&sysctl_vals[2])
>  #define SYSCTL_TWO			((void *)&sysctl_vals[3])
> -#define SYSCTL_FOUR			((void *)&sysctl_vals[4])
> -#define SYSCTL_ONE_HUNDRED		((void *)&sysctl_vals[5])
> -#define SYSCTL_TWO_HUNDRED		((void *)&sysctl_vals[6])
> -#define SYSCTL_ONE_THOUSAND		((void *)&sysctl_vals[7])
> -#define SYSCTL_THREE_THOUSAND		((void *)&sysctl_vals[8])
> -#define SYSCTL_INT_MAX			((void *)&sysctl_vals[9])
> +#define SYSCTL_THREE			((void *)&sysctl_vals[4])
> +#define SYSCTL_FOUR			((void *)&sysctl_vals[5])
> +#define SYSCTL_ONE_HUNDRED		((void *)&sysctl_vals[6])
> +#define SYSCTL_TWO_HUNDRED		((void *)&sysctl_vals[7])
> +#define SYSCTL_ONE_THOUSAND		((void *)&sysctl_vals[8])
> +#define SYSCTL_THREE_THOUSAND		((void *)&sysctl_vals[9])
> +#define SYSCTL_INT_MAX			((void *)&sysctl_vals[10])
>  
>  /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
>  #define SYSCTL_MAXOLDUID		((void *)&sysctl_vals[10])

You forgot to change this one. It should point to 65535, i.e.
&sysctl_vals[11] from your adjusted array.

Maybe it's better to add new constants simply to the tail of the
array? To not adjust it each time and give a room for mistakes.

> diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
> index 7123fe7feeac..6ea51c155860 100644
> --- a/net/core/sysctl_net_core.c
> +++ b/net/core/sysctl_net_core.c

--- 8< ---

> -- 
> 2.27.0

Thanks,
Al