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files: Add new master to file_desc if owners of existing fles have no permissions

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Iterate over fake_master_head and add a fake fake fle of root_item,
which becomes new master and have permissions to restore file_desc.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
This commit is contained in:
Kirill Tkhai 2017-06-07 14:29:17 +03:00 committed by Andrei Vagin
parent f03848309c
commit 373f9327f9
3 changed files with 37 additions and 0 deletions
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5
criu/cr-restore.c
View File

@ -375,6 +375,11 @@ static int root_prepare_shared(void)
if (ret)
goto err;
/* This func may add new files, so it must be called before post prepare */
ret = add_fake_fds_masters();
if (ret)
goto err;
ret = run_post_prepare();
if (ret)
goto err;

31
criu/files.c
View File

@ -1893,3 +1893,34 @@ int prepare_files(void)
init_fdesc_hash();
return collect_image(&files_cinfo);
}
int add_fake_fds_masters(void)
{
struct fdinfo_list_entry *fle;
struct file_desc *fdesc, *tmp;
FdinfoEntry *fe;
int fd;
list_for_each_entry_safe(fdesc, tmp, &fake_master_head, fake_master_list) {
fle = list_first_entry(&fdesc->fd_info_head,
struct fdinfo_list_entry, desc_list);
/*
* All masters are created in root_item for now.
* Distribute them over pstree if someone reports,
* their number is too big, or you want support
* file->user_ns.
*/
fd = find_unused_fd(root_item, -1);
fe = dup_fdinfo(fle->fe, fd, fle->fe->flags);
if (!fe)
goto err;
if (collect_fd(vpid(root_item), fe, rsti(root_item), true))
goto err;
}
BUG_ON(!list_empty(&fake_master_head));
return 0;
err:
pr_err("Can't prepare fds masters\n");
return -1;
}

1
criu/include/files.h
View File

@ -164,6 +164,7 @@ extern int rst_file_params(int fd, FownEntry *fown, int flags);
extern void show_saved_files(void);
extern int add_fake_fds_masters(void);
extern int prepare_fds(struct pstree_item *me);
extern int prepare_fd_pid(struct pstree_item *me);
extern int prepare_ctl_tty(int pid, struct rst_info *rst_info, u32 ctl_tty_id);