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Commit 20284ab7 authored by Al Viro's avatar Al Viro
Browse files

switch mount_capable() to fs_context 



	now both callers of mount_capable() have access to fs_context;
the only difference is that for sget_fc() we have the possibility
of fc->global being true, while for legacy_get_tree() it's guaranteed
to be impossible.  Unify to more generic variant...

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent fd912087

fs/fs_context.c

+1 −1
Original line number Diff line number Diff line
@@ -663,7 +663,7 @@ static int legacy_get_tree(struct fs_context *fc) 
	struct dentry *root;



	if (!(fc->sb_flags & (SB_KERNMOUNT|SB_SUBMOUNT))) {

		if (!mount_capable(fc->fs_type, fc->user_ns))

		if (!mount_capable(fc))

			return -EPERM;

	}

fs/internal.h

+1 −1
Original line number Diff line number Diff line
@@ -114,7 +114,7 @@ extern struct file *alloc_empty_file_noaccount(int, const struct cred *); 
extern int reconfigure_super(struct fs_context *);

extern bool trylock_super(struct super_block *sb);

extern struct super_block *user_get_super(dev_t);

extern bool mount_capable(struct file_system_type *, struct user_namespace *);

extern bool mount_capable(struct fs_context *);



/*

 * open.c

fs/super.c

+7 −4
Original line number Diff line number Diff line
@@ -476,12 +476,15 @@ void generic_shutdown_super(struct super_block *sb) 


EXPORT_SYMBOL(generic_shutdown_super);



bool mount_capable(struct file_system_type *type, struct user_namespace *userns)

bool mount_capable(struct fs_context *fc)

{

	if (!(type->fs_flags & FS_USERNS_MOUNT))

	struct user_namespace *user_ns = fc->global ? &init_user_ns

						    : fc->user_ns;



	if (!(fc->fs_type->fs_flags & FS_USERNS_MOUNT))

		return capable(CAP_SYS_ADMIN);

	else

		return ns_capable(userns, CAP_SYS_ADMIN);

		return ns_capable(user_ns, CAP_SYS_ADMIN);

}



/**
@@ -513,7 +516,7 @@ struct super_block *sget_fc(struct fs_context *fc, 


	if (!(fc->sb_flags & SB_KERNMOUNT) &&

	    fc->purpose != FS_CONTEXT_FOR_SUBMOUNT) {

		if (!mount_capable(fc->fs_type, user_ns))

		if (!mount_capable(fc))

			return ERR_PTR(-EPERM);

	}