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76 lines
2.8 KiB
76 lines
2.8 KiB
8 months ago
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From d83713ea522032bb135bf7f442779a431840a6db Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Michal=20Koutn=C3=BD?= <mkoutny@suse.com>
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Date: Wed, 18 Jan 2023 23:20:31 +0100
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Subject: [PATCH] core: mount namespaces: Remove auxiliary bind mounts
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directory after unit termination
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Unit that requires its own mount namespace creates a temporary directory
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to implement dynamic bind mounts (org.freedesktop.systemd1.Manager.BindMountUnit).
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However, this directory is never removed and they will accumulate for
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each unique unit (e.g. templated units of systemd-coredump@).
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Attach the auxiliary runtime directory existence to lifetime of other
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"runtime" only per-unit directories.
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(cherry picked from commit b9f976fb45635e09cd709dbedd0afb03d4b73c05)
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Resolves: RHEL-19483
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---
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src/core/execute.c | 17 +++++++++++++++++
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src/core/execute.h | 1 +
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src/core/unit.c | 1 +
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3 files changed, 19 insertions(+)
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diff --git a/src/core/execute.c b/src/core/execute.c
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index b5b7de6d2a..ea36254241 100644
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--- a/src/core/execute.c
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+++ b/src/core/execute.c
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@@ -5478,6 +5478,23 @@ int exec_context_destroy_credentials(const ExecContext *c, const char *runtime_p
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return 0;
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}
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+int exec_context_destroy_mount_ns_dir(Unit *u) {
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+ _cleanup_free_ char *p = NULL;
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+
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+ if (!u || !MANAGER_IS_SYSTEM(u->manager))
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+ return 0;
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+
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+ p = path_join("/run/systemd/propagate/", u->id);
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+ if (!p)
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+ return -ENOMEM;
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+
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+ /* This is only filled transiently (see mount_in_namespace()), should be empty or even non-existent*/
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+ if (rmdir(p) < 0 && errno != ENOENT)
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+ log_unit_debug_errno(u, errno, "Unable to remove propagation dir '%s', ignoring: %m", p);
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+
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+ return 0;
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+}
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+
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static void exec_command_done(ExecCommand *c) {
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assert(c);
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diff --git a/src/core/execute.h b/src/core/execute.h
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index a2cf22806b..4c54422073 100644
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--- a/src/core/execute.h
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+++ b/src/core/execute.h
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@@ -453,6 +453,7 @@ void exec_context_dump(const ExecContext *c, FILE* f, const char *prefix);
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int exec_context_destroy_runtime_directory(const ExecContext *c, const char *runtime_root);
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int exec_context_destroy_credentials(const ExecContext *c, const char *runtime_root, const char *unit);
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+int exec_context_destroy_mount_ns_dir(Unit *u);
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const char* exec_context_fdname(const ExecContext *c, int fd_index);
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diff --git a/src/core/unit.c b/src/core/unit.c
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index 438213a47a..c9a42ee3d7 100644
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--- a/src/core/unit.c
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+++ b/src/core/unit.c
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@@ -5778,6 +5778,7 @@ void unit_destroy_runtime_data(Unit *u, const ExecContext *context) {
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exec_context_destroy_runtime_directory(context, u->manager->prefix[EXEC_DIRECTORY_RUNTIME]);
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exec_context_destroy_credentials(context, u->manager->prefix[EXEC_DIRECTORY_RUNTIME], u->id);
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+ exec_context_destroy_mount_ns_dir(u);
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}
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int unit_clean(Unit *u, ExecCleanMask mask) {
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