linux-kernel - Re: [PATCH 3/3] fs/file.c: move sanity_check from alloc_fd() to put_unused

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Message-ID: <ZnFGy2nYI9XZSvMl@tiehlicka>
Date: Tue, 18 Jun 2024 10:35:23 +0200
From: Michal Hocko <mhocko@...e.com>
To: Tim Chen <tim.c.chen@...ux.intel.com>
Cc: Mateusz Guzik <mjguzik@...il.com>, Yu Ma <yu.ma@...el.com>,
	viro@...iv.linux.org.uk, brauner@...nel.org, jack@...e.cz,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	tim.c.chen@...el.com, pan.deng@...el.com, tianyou.li@...el.com
Subject: Re: [PATCH 3/3] fs/file.c: move sanity_check from alloc_fd() to
 put_unused_fd()

On Mon 17-06-24 11:04:41, Tim Chen wrote:
> diff --git a/kernel/sys.c b/kernel/sys.c
> index 3a2df1bd9f64..b4e523728c3e 100644
> --- a/kernel/sys.c
> +++ b/kernel/sys.c
> @@ -1471,6 +1471,7 @@ static int do_prlimit(struct task_struct *tsk, unsigned int resource,
>                 return -EINVAL;
>         resource = array_index_nospec(resource, RLIM_NLIMITS);
>  
> +       task_lock(tsk->group_leader);
>         if (new_rlim) {
>                 if (new_rlim->rlim_cur > new_rlim->rlim_max)
>                         return -EINVAL;

This is clearly broken as it leaves the lock behind on the error, no?
-- 
Michal Hocko
SUSE Labs