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crun/SOURCES/d8a88c0620882fbc989f29ba83d1c46fab3bca09.patch

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From d8a88c0620882fbc989f29ba83d1c46fab3bca09 Mon Sep 17 00:00:00 2001
From: Giuseppe Scrivano <gscrivan@redhat.com>
Date: Tue, 9 Sep 2025 18:16:34 +0200
Subject: [PATCH] criu: checkpoint correctly the shared empty directory path
commit 4004e5bed9ff52029a829131fbc16f9a877154b9 introduced the
regression. It is not part of any release.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
---
src/libcrun/criu.c | 76 ++++++++++++++++++++++++++++++-------------
src/libcrun/linux.c | 20 ++++--------
src/libcrun/seccomp.c | 4 +--
src/libcrun/status.c | 22 +++++++++++++
src/libcrun/status.h | 1 +
5 files changed, 86 insertions(+), 37 deletions(-)
diff --git a/src/libcrun/criu.c b/src/libcrun/criu.c
index f94c243d6e..45c1cce81b 100644
--- a/src/libcrun/criu.c
+++ b/src/libcrun/criu.c
@@ -267,6 +267,54 @@ criu_check_mem_track (char *work_path, libcrun_error_t *err)
# endif
+static int
+register_masked_paths_mounts (runtime_spec_schema_config_schema *def, libcrun_container_t *container,
+ struct libcriu_wrapper_s *libcriu_wrapper, bool is_restore, libcrun_error_t *err)
+{
+ cleanup_free char *empty_dir_path = NULL;
+ bool shared_dir_registered = false;
+ size_t i;
+ int ret;
+
+ for (i = 0; i < def->linux->masked_paths_len; i++)
+ {
+ struct stat statbuf;
+ ret = stat (def->linux->masked_paths[i], &statbuf);
+ if (ret != 0)
+ continue;
+
+ if (S_ISDIR (statbuf.st_mode))
+ {
+ if (! shared_dir_registered)
+ {
+ ret = get_shared_empty_directory_path (&empty_dir_path,
+ (container->context ? container->context->state_root : NULL), err);
+ if (UNLIKELY (ret < 0))
+ return ret;
+
+ ret = libcriu_wrapper->criu_add_ext_mount (empty_dir_path, empty_dir_path);
+ if (UNLIKELY (ret < 0))
+ return crun_make_error (err, -ret, "CRIU: failed adding external mount for shared empty directory `%s`", empty_dir_path);
+
+ shared_dir_registered = true;
+ }
+
+ ret = libcriu_wrapper->criu_add_ext_mount (def->linux->masked_paths[i], empty_dir_path);
+ if (UNLIKELY (ret < 0))
+ return crun_make_error (err, -ret, "CRIU: failed adding external mount for masked directory `%s`", def->linux->masked_paths[i]);
+ }
+ else if (S_ISREG (statbuf.st_mode))
+ {
+ const char *bind_target = is_restore ? "/dev/null" : def->linux->masked_paths[i];
+ ret = libcriu_wrapper->criu_add_ext_mount (def->linux->masked_paths[i], bind_target);
+ if (UNLIKELY (ret < 0))
+ return crun_make_error (err, -ret, "CRIU: failed adding external mount to `%s`", bind_target);
+ }
+ }
+
+ return 0;
+}
+
static int
restore_cgroup_v1_mount (runtime_spec_schema_config_schema *def, libcrun_error_t *err)
{
@@ -609,17 +657,9 @@ libcrun_container_checkpoint_linux_criu (libcrun_container_status_t *status, lib
}
}
- for (i = 0; i < def->linux->masked_paths_len; i++)
- {
- struct stat statbuf;
- ret = stat (def->linux->masked_paths[i], &statbuf);
- if (ret == 0 && S_ISREG (statbuf.st_mode))
- {
- ret = libcriu_wrapper->criu_add_ext_mount (def->linux->masked_paths[i], def->linux->masked_paths[i]);
- if (UNLIKELY (ret < 0))
- return crun_make_error (err, -ret, "CRIU: failed adding external mount to `%s`", def->linux->masked_paths[i]);
- }
- }
+ ret = register_masked_paths_mounts (def, container, libcriu_wrapper, false, err);
+ if (UNLIKELY (ret < 0))
+ return ret;
/* CRIU tries to checkpoint and restore all namespaces. However,
* namespaces could be shared between containers in a pod.
@@ -947,17 +987,9 @@ libcrun_container_restore_linux_criu (libcrun_container_status_t *status, libcru
}
}
- for (i = 0; i < def->linux->masked_paths_len; i++)
- {
- struct stat statbuf;
- ret = stat (def->linux->masked_paths[i], &statbuf);
- if (ret == 0 && S_ISREG (statbuf.st_mode))
- {
- ret = libcriu_wrapper->criu_add_ext_mount (def->linux->masked_paths[i], "/dev/null");
- if (UNLIKELY (ret < 0))
- return crun_make_error (err, -ret, "CRIU: failed adding external mount to `%s`", "/dev/null");
- }
- }
+ ret = register_masked_paths_mounts (def, container, libcriu_wrapper, true, err);
+ if (UNLIKELY (ret < 0))
+ return ret;
/* do realpath on root */
bundle_cleanup = realpath (status->bundle, NULL);
diff --git a/src/libcrun/linux.c b/src/libcrun/linux.c
index ce7faa5b24..ed0d888794 100644
--- a/src/libcrun/linux.c
+++ b/src/libcrun/linux.c
@@ -1087,7 +1087,6 @@ get_shared_empty_dir_cached (libcrun_container_t *container, char **proc_fd_path
{
struct private_data_s *private_data = get_private_data (container);
cleanup_close int fd = -1;
- cleanup_free char *run_dir = NULL;
cleanup_free char *empty_dir_path = NULL;
int ret;
@@ -1099,16 +1098,7 @@ get_shared_empty_dir_cached (libcrun_container_t *container, char **proc_fd_path
}
/* Slow path: create directory and cache everything once */
- ret = get_run_directory (&run_dir, container->context->state_root, err);
- if (UNLIKELY (ret < 0))
- return ret;
-
- ret = append_paths (&empty_dir_path, err, run_dir, ".empty-directory", NULL);
- if (UNLIKELY (ret < 0))
- return ret;
-
- /* Ensure the empty directory exists (once per container) */
- ret = crun_ensure_directory (empty_dir_path, 0555, false, err);
+ ret = get_shared_empty_directory_path (&empty_dir_path, container->context->state_root, err);
if (UNLIKELY (ret < 0))
return ret;
@@ -2674,7 +2664,9 @@ do_notify_socket (libcrun_container_t *container, const char *rootfs, libcrun_er
if (notify_socket == NULL)
return 0;
- ret = libcrun_get_state_directory (&state_dir, container->context->state_root, container->context->id, err);
+ ret = libcrun_get_state_directory (&state_dir,
+ (container->context ? container->context->state_root : NULL),
+ container->context->id, err);
if (UNLIKELY (ret < 0))
return ret;
@@ -4637,7 +4629,9 @@ prepare_and_send_dev_mounts (libcrun_container_t *container, int sync_socket_hos
if (! has_userns || is_empty_string (container->context->id) || geteuid () > 0)
return send_mounts (sync_socket_host, dev_fds, how_many, def->linux->devices_len, err);
- ret = libcrun_get_state_directory (&state_dir, container->context->state_root, container->context->id, err);
+ ret = libcrun_get_state_directory (&state_dir,
+ (container->context ? container->context->state_root : NULL),
+ container->context->id, err);
if (UNLIKELY (ret < 0))
return ret;
diff --git a/src/libcrun/seccomp.c b/src/libcrun/seccomp.c
index 6075c87dff..7d769093c8 100644
--- a/src/libcrun/seccomp.c
+++ b/src/libcrun/seccomp.c
@@ -589,7 +589,7 @@ store_seccomp_cache (struct libcrun_seccomp_gen_ctx_s *ctx, libcrun_error_t *err
if (is_empty_string (ctx->checksum))
return 0;
- dirfd = open_rundir_dirfd (container->context->state_root, err);
+ dirfd = open_rundir_dirfd ((container->context ? container->context->state_root : NULL), err);
if (UNLIKELY (dirfd < 0))
return dirfd;
@@ -874,7 +874,7 @@ libcrun_open_seccomp_bpf (struct libcrun_seccomp_gen_ctx_s *ctx, int *fd, libcru
if (container == NULL || container->context == NULL)
return crun_make_error (err, EINVAL, "invalid internal state");
- dirfd = open_rundir_dirfd (container->context->state_root, err);
+ dirfd = open_rundir_dirfd ((container->context ? container->context->state_root : NULL), err);
if (UNLIKELY (dirfd < 0))
return dirfd;
diff --git a/src/libcrun/status.c b/src/libcrun/status.c
index 5e6dd63594..d57e7a3fbe 100644
--- a/src/libcrun/status.c
+++ b/src/libcrun/status.c
@@ -85,6 +85,28 @@ get_run_directory (char **out, const char *state_root, libcrun_error_t *err)
return 0;
}
+int
+get_shared_empty_directory_path (char **out, const char *state_root, libcrun_error_t *err)
+{
+ cleanup_free char *run_dir = NULL;
+ int ret;
+
+ ret = get_run_directory (&run_dir, state_root, err);
+ if (UNLIKELY (ret < 0))
+ return ret;
+
+ ret = append_paths (out, err, run_dir, ".empty-directory", NULL);
+ if (UNLIKELY (ret < 0))
+ return ret;
+
+ /* Ensure the empty directory exists */
+ ret = crun_ensure_directory (*out, 0555, false, err);
+ if (UNLIKELY (ret < 0))
+ return ret;
+
+ return 0;
+}
+
int
libcrun_get_state_directory (char **out, const char *state_root, const char *id, libcrun_error_t *err)
{
diff --git a/src/libcrun/status.h b/src/libcrun/status.h
index 994624e416..d37a8d2a02 100644
--- a/src/libcrun/status.h
+++ b/src/libcrun/status.h
@@ -65,6 +65,7 @@ int libcrun_status_write_exec_fifo (const char *state_root, const char *id, libc
int libcrun_status_has_read_exec_fifo (const char *state_root, const char *id, libcrun_error_t *err);
int libcrun_check_pid_valid (libcrun_container_status_t *status, libcrun_error_t *err);
int get_run_directory (char **out, const char *state_root, libcrun_error_t *err);
+int get_shared_empty_directory_path (char **out, const char *state_root, libcrun_error_t *err);
static inline void
libcrun_free_container_listp (void *p)
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