From 2cb7e0aaedad73b076ea18c6900b0e86c5760d79 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 15:00:47 +0200 Subject: Adding upstream version 247.3. Signed-off-by: Daniel Baumann --- src/shared/binfmt-util.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 src/shared/binfmt-util.c (limited to 'src/shared/binfmt-util.c') diff --git a/src/shared/binfmt-util.c b/src/shared/binfmt-util.c new file mode 100644 index 0000000..724d7f2 --- /dev/null +++ b/src/shared/binfmt-util.c @@ -0,0 +1,35 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include +#include +#include + +#include "binfmt-util.h" +#include "fileio.h" +#include "missing_magic.h" +#include "stat-util.h" + +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 = path_is_fs_type("/proc/sys/fs/binfmt_misc", BINFMTFS_MAGIC); + if (r == 0 || r == -ENOENT) { + log_debug("binfmt_misc is not mounted, not detaching entries."); + return 0; + } + if (r < 0) + return log_warning_errno(r, "Failed to determine whether binfmt_misc is mounted: %m"); + + 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; +} -- cgit v1.2.3