linux-kernel - Re: [PATCH] fs/locks: fix fcntl_getlk64/fcntl

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Message-ID: <d42a74e22f8b0056a812b88c09a0e484d5db3987.camel@kernel.org>
Date:   Tue, 23 Nov 2021 11:34:02 -0500
From:   Jeff Layton <jlayton@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>
Cc:     kernel test robot <lkp@...el.com>, Christoph Hellwig <hch@....de>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Jan Kara <jack@...e.cz>, Jens Axboe <axboe@...nel.dk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fs/locks: fix fcntl_getlk64/fcntl_setlk64 stub
 prototypes

On Tue, 2021-11-23 at 17:05 +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> My patch to rework oabi fcntl64() introduced a harmless
> sparse warning when file locking is disabled:
> 
>    arch/arm/kernel/sys_oabi-compat.c:251:51: sparse: sparse: incorrect type in argument 3 (different address spaces) @@     expected struct flock64 [noderef] __user *user @@     got struct flock64 * @@
>    arch/arm/kernel/sys_oabi-compat.c:251:51: sparse:     expected struct flock64 [noderef] __user *user
>    arch/arm/kernel/sys_oabi-compat.c:251:51: sparse:     got struct flock64 *
>    arch/arm/kernel/sys_oabi-compat.c:265:55: sparse: sparse: incorrect type in argument 4 (different address spaces) @@     expected struct flock64 [noderef] __user *user @@     got struct flock64 * @@
>    arch/arm/kernel/sys_oabi-compat.c:265:55: sparse:     expected struct flock64 [noderef] __user *user
>    arch/arm/kernel/sys_oabi-compat.c:265:55: sparse:     got struct flock64 *
> 
> When file locking is enabled, everything works correctly and the
> right data gets passed, but the stub declarations in linux/fs.h
> did not get modified when the calling conventions changed in an
> earlier patch.
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Fixes: 7e2d8c29ecdd ("ARM: 9111/1: oabi-compat: rework fcntl64() emulation")
> Fixes: a75d30c77207 ("fs/locks: pass kernel struct flock to fcntl_getlk/setlk")
> Cc: Christoph Hellwig <hch@....de>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  include/linux/fs.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 1cb616fc1105..698d92567841 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -1220,13 +1220,13 @@ static inline int fcntl_setlk(unsigned int fd, struct file *file,
>  
>  #if BITS_PER_LONG == 32
>  static inline int fcntl_getlk64(struct file *file, unsigned int cmd,
> -				struct flock64 __user *user)
> +				struct flock64 *user)
>  {
>  	return -EINVAL;
>  }
>  
>  static inline int fcntl_setlk64(unsigned int fd, struct file *file,
> -				unsigned int cmd, struct flock64 __user *user)
> +				unsigned int cmd, struct flock64 *user)
>  {
>  	return -EACCES;
>  }

Thanks Arnd. I'll pull this in for v5.17. Let me know if it needs to go
in sooner.

Thanks,
-- 
Jeff Layton <jlayton@...nel.org>