linux-kernel - Re: [PATCH v2] ucounts: add missing data type changes

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Date:   Wed, 28 Jul 2021 12:16:56 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Sven Schnelle <svens@...ux.ibm.com>
Cc:     Alexey Gladkov <legion@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ucounts: add missing data type changes

Sven Schnelle <svens@...ux.ibm.com> writes:

> commit f9c82a4ea89c3 ("Increase size of ucounts to atomic_long_t")
> changed the data type of ucounts/ucounts_max to long, but missed to
> adjust a few other places. This is noticeable on big endian platforms
> from user space because the /proc/sys/user/max_*_names files all
> contain 0.

As far as this goes I don't have any problem with this patch.

However it looks like you missed
fs/notify/inotify_user.c:inotify_table[].

Any chance you can add to the patch that verify things look ok and send
version 3?

Thanks,
Eric


> Fixes: f9c82a4ea89c ("Increase size of ucounts to atomic_long_t")
> Signed-off-by: Sven Schnelle <svens@...ux.ibm.com>
> ---
>  fs/notify/fanotify/fanotify_user.c | 10 ++++++----
>  kernel/ucount.c                    | 16 ++++++++--------
>  2 files changed, 14 insertions(+), 12 deletions(-)
>
> diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
> index 64864fb40b40..6576657a1a25 100644
> --- a/fs/notify/fanotify/fanotify_user.c
> +++ b/fs/notify/fanotify/fanotify_user.c
> @@ -58,18 +58,20 @@ struct ctl_table fanotify_table[] = {
>  	{
>  		.procname	= "max_user_groups",
>  		.data	= &init_user_ns.ucount_max[UCOUNT_FANOTIFY_GROUPS],
> -		.maxlen		= sizeof(int),
> +		.maxlen		= sizeof(long),
>  		.mode		= 0644,
> -		.proc_handler	= proc_dointvec_minmax,
> +		.proc_handler	= proc_doulongvec_minmax,
>  		.extra1		= SYSCTL_ZERO,
> +		.extra2		= SYSCTL_INT_MAX,
>  	},
>  	{
>  		.procname	= "max_user_marks",
>  		.data	= &init_user_ns.ucount_max[UCOUNT_FANOTIFY_MARKS],
> -		.maxlen		= sizeof(int),
> +		.maxlen		= sizeof(long),
>  		.mode		= 0644,
> -		.proc_handler	= proc_dointvec_minmax,
> +		.proc_handler	= proc_doulongvec_minmax,
>  		.extra1		= SYSCTL_ZERO,
> +		.extra2		= SYSCTL_INT_MAX,
>  	},
>  	{
>  		.procname	= "max_queued_events",
> diff --git a/kernel/ucount.c b/kernel/ucount.c
> index 87799e2379bd..f852591e395c 100644
> --- a/kernel/ucount.c
> +++ b/kernel/ucount.c
> @@ -58,14 +58,14 @@ static struct ctl_table_root set_root = {
>  	.permissions = set_permissions,
>  };
>  
> -#define UCOUNT_ENTRY(name)				\
> -	{						\
> -		.procname	= name,			\
> -		.maxlen		= sizeof(int),		\
> -		.mode		= 0644,			\
> -		.proc_handler	= proc_dointvec_minmax,	\
> -		.extra1		= SYSCTL_ZERO,		\
> -		.extra2		= SYSCTL_INT_MAX,	\
> +#define UCOUNT_ENTRY(name)					\
> +	{							\
> +		.procname	= name,				\
> +		.maxlen		= sizeof(long),			\
> +		.mode		= 0644,				\
> +		.proc_handler	= proc_doulongvec_minmax,	\
> +		.extra1		= SYSCTL_ZERO,			\
> +		.extra2		= SYSCTL_INT_MAX,		\
>  	}
>  static struct ctl_table user_table[] = {
>  	UCOUNT_ENTRY("max_user_namespaces"),