linux-ext4 - Re: [PATCH] vfs: fix check for tmpfile support

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Date: Thu, 22 Feb 2024 14:05:20 +0000
From: Luis Henriques <lhenriques@...e.de>
To: Christian Brauner <brauner@...nel.org>
Cc: Zorro Lang <zlang@...nel.org>,  linux-ext4@...r.kernel.org,
  fstests@...r.kernel.org
Subject: Re: [PATCH] vfs: fix check for tmpfile support

Christian Brauner <brauner@...nel.org> writes:

> When ext4 is used with quota support the test fails with EINVAL because
> it is run after we idmapped the mount. If the caller's fs{g,u}ids aren't
> mapped then we fail and log a misleading error. Move the checks for
> tmpfile support right at the beginning of the test in all tests.
>
> Reported-by: Luis Henriques <lhenriques@...e.de>
> Link: https://lore.kernel.org/r/20240222-knast-reifen-953312ce17a9@brauner
> Signed-off-by: Christian Brauner <brauner@...nel.org>

FWIW I've just tested this patch and I can confirm it fixes the failures I
was seeing in ext4.  Again, thanks a lot, Christian.

Cheers,
-- 
Luís


> ---
>  src/vfs/idmapped-mounts.c | 24 ++++++++++++------------
>  1 file changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/src/vfs/idmapped-mounts.c b/src/vfs/idmapped-mounts.c
> index 547182fe..e490f3d7 100644
> --- a/src/vfs/idmapped-mounts.c
> +++ b/src/vfs/idmapped-mounts.c
> @@ -3815,6 +3815,8 @@ int tcore_setgid_create_idmapped(const struct vfstest_info *info)
>  		goto out;
>  	}
>  
> +	supported = openat_tmpfile_supported(info->t_dir1_fd);
> +
>  	/* Changing mount properties on a detached mount. */
>  	attr.userns_fd	= get_userns_fd(0, 10000, 10000);
>  	if (attr.userns_fd < 0) {
> @@ -3838,8 +3840,6 @@ int tcore_setgid_create_idmapped(const struct vfstest_info *info)
>  		goto out;
>  	}
>  
> -	supported = openat_tmpfile_supported(open_tree_fd);
> -
>  	pid = fork();
>  	if (pid < 0) {
>  		log_stderr("failure: fork");
> @@ -3991,6 +3991,8 @@ int tcore_setgid_create_idmapped_in_userns(const struct vfstest_info *info)
>  		goto out;
>  	}
>  
> +	supported = openat_tmpfile_supported(info->t_dir1_fd);
> +
>  	/* Changing mount properties on a detached mount. */
>  	attr.userns_fd	= get_userns_fd(0, 10000, 10000);
>  	if (attr.userns_fd < 0) {
> @@ -4014,8 +4016,6 @@ int tcore_setgid_create_idmapped_in_userns(const struct vfstest_info *info)
>  		goto out;
>  	}
>  
> -	supported = openat_tmpfile_supported(open_tree_fd);
> -
>  	pid = fork();
>  	if (pid < 0) {
>  		log_stderr("failure: fork");
> @@ -7715,6 +7715,8 @@ static int setgid_create_umask_idmapped(const struct vfstest_info *info)
>  		goto out;
>  	}
>  
> +	supported = openat_tmpfile_supported(info->t_dir1_fd);
> +
>  	/* Changing mount properties on a detached mount. */
>  	attr.userns_fd	= get_userns_fd(0, 10000, 10000);
>  	if (attr.userns_fd < 0) {
> @@ -7738,8 +7740,6 @@ static int setgid_create_umask_idmapped(const struct vfstest_info *info)
>  		goto out;
>  	}
>  
> -	supported = openat_tmpfile_supported(open_tree_fd);
> -
>  	pid = fork();
>  	if (pid < 0) {
>  		log_stderr("failure: fork");
> @@ -7929,6 +7929,8 @@ static int setgid_create_umask_idmapped_in_userns(const struct vfstest_info *inf
>  		goto out;
>  	}
>  
> +	supported = openat_tmpfile_supported(info->t_dir1_fd);
> +
>  	/* Changing mount properties on a detached mount. */
>  	attr.userns_fd	= get_userns_fd(0, 10000, 10000);
>  	if (attr.userns_fd < 0) {
> @@ -7952,8 +7954,6 @@ static int setgid_create_umask_idmapped_in_userns(const struct vfstest_info *inf
>  		goto out;
>  	}
>  
> -	supported = openat_tmpfile_supported(open_tree_fd);
> -
>  	/*
>  	 * Below we verify that setgid inheritance for a newly created file or
>  	 * directory works correctly. As part of this we need to verify that
> @@ -8163,6 +8163,8 @@ static int setgid_create_acl_idmapped(const struct vfstest_info *info)
>  		goto out;
>  	}
>  
> +	supported = openat_tmpfile_supported(info->t_dir1_fd);
> +
>  	/* Changing mount properties on a detached mount. */
>  	attr.userns_fd	= get_userns_fd(0, 10000, 10000);
>  	if (attr.userns_fd < 0) {
> @@ -8186,8 +8188,6 @@ static int setgid_create_acl_idmapped(const struct vfstest_info *info)
>  		goto out;
>  	}
>  
> -	supported = openat_tmpfile_supported(open_tree_fd);
> -
>  	pid = fork();
>  	if (pid < 0) {
>  		log_stderr("failure: fork");
> @@ -8518,6 +8518,8 @@ static int setgid_create_acl_idmapped_in_userns(const struct vfstest_info *info)
>  		goto out;
>  	}
>  
> +	supported = openat_tmpfile_supported(info->t_dir1_fd);
> +
>  	/* Changing mount properties on a detached mount. */
>  	attr.userns_fd	= get_userns_fd(0, 10000, 10000);
>  	if (attr.userns_fd < 0) {
> @@ -8541,8 +8543,6 @@ static int setgid_create_acl_idmapped_in_userns(const struct vfstest_info *info)
>  		goto out;
>  	}
>  
> -	supported = openat_tmpfile_supported(open_tree_fd);
> -
>  	/*
>  	 * Below we verify that setgid inheritance for a newly created file or
>  	 * directory works correctly. As part of this we need to verify that
> -- 
>
> 2.43.0
>