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debugfs: only accept read attributes for blobs 

Blobs can only be read. So, keep only 'read' file attributes because the
others will not work and only confuse users.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20210504131350.46586-1-wsa+renesas@sang-engineering.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wolfram Sang 2021-05-04 15:13:49 +02:00 committed by Greg Kroah-Hartman
parent 0733d83905
commit d616f56d34
1 changed files with 3 additions and 2 deletions
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5
fs/debugfs/file.c
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@ -980,7 +980,8 @@ static const struct file_operations fops_blob = {
/**
* debugfs_create_blob - create a debugfs file that is used to read a binary blob
* @name: a pointer to a string containing the name of the file to create.
* @mode: the permission that the file should have
* @mode: the read permission that the file should have (other permissions are
* masked out)
* @parent: a pointer to the parent dentry for this file. This should be a
* directory dentry if set. If this parameter is %NULL, then the
* file will be created in the root of the debugfs filesystem.
@ -1004,7 +1005,7 @@ struct dentry *debugfs_create_blob(const char *name, umode_t mode,
struct dentry *parent,
struct debugfs_blob_wrapper *blob)
{
return debugfs_create_file_unsafe(name, mode, parent, blob, &fops_blob);
return debugfs_create_file_unsafe(name, mode & 0444, parent, blob, &fops_blob);
}
EXPORT_SYMBOL_GPL(debugfs_create_blob);