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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <sys/vfs.h>
#include "binfmt-util.h"
#include "errno-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "fs-util.h"
#include "missing_magic.h"
#include "stat-util.h"
int binfmt_mounted(void) {
_cleanup_close_ int fd = -EBADF;
int r;
fd = RET_NERRNO(open("/proc/sys/fs/binfmt_misc", O_CLOEXEC | O_DIRECTORY | O_PATH));
if (fd == -ENOENT)
return false;
if (fd < 0)
return fd;
r = fd_is_fs_type(fd, BINFMTFS_MAGIC);
if (r <= 0)
return r;
return access_fd(fd, W_OK) >= 0;
}
int disable_binfmt(void) {
int r;
/* Flush out all rules. This is important during shutdown to cover for rules using "F", since those
* might pin a file and thus block us from unmounting stuff cleanly.
*
* We are a bit careful here, since binfmt_misc might still be an autofs which we don't want to
* trigger. */
r = binfmt_mounted();
if (r < 0)
return log_warning_errno(r, "Failed to determine whether binfmt_misc is mounted: %m");
if (r == 0) {
log_debug("binfmt_misc is not mounted in read-write mode, not detaching entries.");
return 0;
}
r = write_string_file("/proc/sys/fs/binfmt_misc/status", "-1", WRITE_STRING_FILE_DISABLE_BUFFER);
if (r < 0)
return log_warning_errno(r, "Failed to unregister binfmt_misc entries: %m");
log_debug("Unregistered all remaining binfmt_misc entries.");
return 0;
}
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