linux-kernel - Re: PROBLEM: fanotify

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Message-ID: <20201123164622.GJ27294@quack2.suse.cz>
Date:   Mon, 23 Nov 2020 17:46:22 +0100
From:   Jan Kara <jack@...e.cz>
To:     Paweł Jasiak <pawel@...iak.xyz>
Cc:     Jan Kara <jack@...e.cz>, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Brian Gerst <brgerst@...il.com>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: PROBLEM: fanotify_mark EFAULT on x86

On Tue 03-11-20 22:17:47, Paweł Jasiak wrote:
> I have written small patch that fixes problem for me and doesn't break
> x86_64.

OK, with a help of Boris Petkov I think I have a fix that looks correct
(attach). Can you please try whether it works for you? Thanks!

								Honza

> 
> diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
> index 3e01d8f2ab90..cf0b97309975 100644
> --- a/fs/notify/fanotify/fanotify_user.c
> +++ b/fs/notify/fanotify/fanotify_user.c
> @@ -1285,12 +1285,27 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask,
>  	return ret;
>  }
>  
> +#if defined(CONFIG_X86) && !defined(CONFIG_64BIT)
> +SYSCALL_DEFINE6(fanotify_mark,
> +			int, fanotify_fd, unsigned int, flags, __u32, mask0,
> +			__u32, mask1, int, dfd, const char  __user *, pathname)
> +{
> +	return do_fanotify_mark(fanotify_fd, flags,
> +#ifdef __BIG_ENDIAN
> +				((__u64)mask0 << 32) | mask1,
> +#else
> +				((__u64)mask1 << 32) | mask0,
> +#endif
> +				 dfd, pathname);
> +}
> +#else
>  SYSCALL_DEFINE5(fanotify_mark, int, fanotify_fd, unsigned int, flags,
>  			      __u64, mask, int, dfd,
>  			      const char  __user *, pathname)
>  {
>  	return do_fanotify_mark(fanotify_fd, flags, mask, dfd, pathname);
>  }
> +#endif
>  
>  #ifdef CONFIG_COMPAT
>  COMPAT_SYSCALL_DEFINE6(fanotify_mark,
> 
> 
> -- 
> 
> Paweł Jasiak
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR

View attachment "0001-fanotify-Fix-fanotify_mark-on-32-bit-archs.patch" of type "text/x-patch" (2203 bytes)