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-rw-r--r--configure.ac1
-rw-r--r--man/logind.conf.xml22
-rw-r--r--src/login/logind-gperf.gperf1
-rw-r--r--src/login/logind-user.c92
-rw-r--r--src/login/logind.c2
-rw-r--r--src/login/logind.conf1
-rw-r--r--src/login/logind.h4
-rw-r--r--src/shared/macro.h2
-rw-r--r--src/shared/util.c12
-rw-r--r--src/shared/util.h10
10 files changed, 139 insertions, 8 deletions
diff --git a/configure.ac b/configure.ac
index 7920d6cad3..880672d42c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -180,6 +180,7 @@ AC_SUBST([OUR_LDFLAGS], "$with_ldflags $address_sanitizer_ldflags")
AC_CHECK_SIZEOF(pid_t)
AC_CHECK_SIZEOF(uid_t)
+AC_CHECK_SIZEOF(gid_t)
# ------------------------------------------------------------------------------
# we use python to build the man page index, and for systemd-python
diff --git a/man/logind.conf.xml b/man/logind.conf.xml
index 7673201664..ce8f5097cc 100644
--- a/man/logind.conf.xml
+++ b/man/logind.conf.xml
@@ -295,6 +295,28 @@
</para></listitem>
</varlistentry>
+ <varlistentry>
+ <term><varname>RuntimeDirectorySize=</varname></term>
+
+ <listitem><para>Sets the size limit on
+ the
+ <varname>$XDG_RUNTIME_DIR</varname>
+ runtime directory for each user who
+ logs in. Takes a size in bytes,
+ possibly suffixed with the usual K, G,
+ M, T suffixes, to the base 1024
+ (IEC). Alternatively, a percentage
+ suffixed by <literal>%</literal> may
+ be specified, which sets the size
+ limit relative to the amount of
+ physical RAM. Defaults to 10%. Note
+ that this size is a safety limit
+ only. As each runtime directory is a
+ tmpfs file system it will only consume
+ as much memory as it is filled up
+ to.</para></listitem>
+ </varlistentry>
+
</variablelist>
</refsect1>
diff --git a/src/login/logind-gperf.gperf b/src/login/logind-gperf.gperf
index 845302a54d..d870f88cd8 100644
--- a/src/login/logind-gperf.gperf
+++ b/src/login/logind-gperf.gperf
@@ -30,3 +30,4 @@ Login.HibernateKeyIgnoreInhibited, config_parse_bool, 0, offsetof(Manag
Login.LidSwitchIgnoreInhibited, config_parse_bool, 0, offsetof(Manager, lid_switch_ignore_inhibited)
Login.IdleAction, config_parse_handle_action, 0, offsetof(Manager, idle_action)
Login.IdleActionSec, config_parse_sec, 0, offsetof(Manager, idle_action_usec)
+Login.RuntimeDirectorySize, config_parse_tmpfs_size, 0, offsetof(Manager, runtime_dir_size)
diff --git a/src/login/logind-user.c b/src/login/logind-user.c
index 4af0e90c22..9bbe879571 100644
--- a/src/login/logind-user.c
+++ b/src/login/logind-user.c
@@ -19,6 +19,7 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
+#include <sys/mount.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
@@ -28,10 +29,12 @@
#include "hashmap.h"
#include "strv.h"
#include "fileio.h"
+#include "path-util.h"
#include "special.h"
#include "unit-name.h"
#include "bus-util.h"
#include "bus-error.h"
+#include "conf-parser.h"
#include "logind-user.h"
User* user_new(Manager *m, uid_t uid, gid_t gid, const char *name) {
@@ -311,21 +314,35 @@ static int user_mkdir_runtime_path(User *u) {
}
if (!u->runtime_path) {
- if (asprintf(&p, "/run/user/%lu", (unsigned long) u->uid) < 0)
+ if (asprintf(&p, "/run/user/" UID_FMT, u->uid) < 0)
return log_oom();
} else
p = u->runtime_path;
- r = mkdir_safe_label(p, 0700, u->uid, u->gid);
- if (r < 0) {
- log_error("Failed to create runtime directory %s: %s", p, strerror(-r));
- free(p);
- u->runtime_path = NULL;
- return r;
+ if (path_is_mount_point(p, false) <= 0) {
+ _cleanup_free_ char *t = NULL;
+
+ mkdir(p, 0700);
+
+ if (asprintf(&t, "mode=0700,uid=" UID_FMT ",gid=" GID_FMT ",size=%zu", u->uid, u->gid, u->manager->runtime_dir_size) < 0) {
+ r = log_oom();
+ goto fail;
+ }
+
+ r = mount("tmpfs", p, "tmpfs", MS_NODEV|MS_NOSUID, t);
+ if (r < 0) {
+ log_error("Failed to mount per-user tmpfs directory %s: %s", p, strerror(-r));
+ goto fail;
+ }
}
u->runtime_path = p;
return 0;
+
+fail:
+ free(p);
+ u->runtime_path = NULL;
+ return r;
}
static int user_start_slice(User *u) {
@@ -484,6 +501,13 @@ static int user_remove_runtime_path(User *u) {
if (!u->runtime_path)
return 0;
+ r = rm_rf(u->runtime_path, false, false, false);
+ if (r < 0)
+ log_error("Failed to remove runtime directory %s: %s", u->runtime_path, strerror(-r));
+
+ if (umount2(u->runtime_path, MNT_DETACH) < 0)
+ log_error("Failed to unmount user runtime directory %s: %m", u->runtime_path);
+
r = rm_rf(u->runtime_path, false, true, false);
if (r < 0)
log_error("Failed to remove runtime directory %s: %s", u->runtime_path, strerror(-r));
@@ -691,3 +715,57 @@ static const char* const user_state_table[_USER_STATE_MAX] = {
};
DEFINE_STRING_TABLE_LOOKUP(user_state, UserState);
+
+int config_parse_tmpfs_size(
+ const char* unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ size_t *sz = data;
+ const char *e;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ e = endswith(rvalue, "%");
+ if (e) {
+ unsigned long ul;
+ char *f;
+
+ errno = 0;
+ ul = strtoul(rvalue, &f, 10);
+ if (errno != 0 || f != e) {
+ log_syntax(unit, LOG_ERR, filename, line, errno ? errno : EINVAL, "Failed to parse percentage value, ignoring: %s", rvalue);
+ return 0;
+ }
+
+ if (ul <= 0 || ul >= 100) {
+ log_syntax(unit, LOG_ERR, filename, line, errno ? errno : EINVAL, "Percentage value out of range, ignoring: %s", rvalue);
+ return 0;
+ }
+
+ *sz = PAGE_ALIGN((size_t) ((physical_memory() * (uint64_t) ul) / (uint64_t) 100));
+ } else {
+ off_t o;
+
+ r = parse_size(rvalue, 1024, &o);
+ if (r < 0 || (off_t) (size_t) o != o) {
+ log_syntax(unit, LOG_ERR, filename, line, r < 0 ? -r : ERANGE, "Failed to parse size value, ignoring: %s", rvalue);
+ return 0;
+ }
+
+ *sz = PAGE_ALIGN((size_t) o);
+ }
+
+ return 0;
+}
diff --git a/src/login/logind.c b/src/login/logind.c
index fd113b3e79..03b77539bd 100644
--- a/src/login/logind.c
+++ b/src/login/logind.c
@@ -60,6 +60,8 @@ Manager *manager_new(void) {
m->idle_action = HANDLE_IGNORE;
m->idle_action_not_before_usec = now(CLOCK_MONOTONIC);
+ m->runtime_dir_size = PAGE_ALIGN((size_t) (physical_memory() / 10)); /* 10% */
+
m->devices = hashmap_new(string_hash_func, string_compare_func);
m->seats = hashmap_new(string_hash_func, string_compare_func);
m->sessions = hashmap_new(string_hash_func, string_compare_func);
diff --git a/src/login/logind.conf b/src/login/logind.conf
index c0abf01b0c..ddc23b8aca 100644
--- a/src/login/logind.conf
+++ b/src/login/logind.conf
@@ -24,3 +24,4 @@
#LidSwitchIgnoreInhibited=yes
#IdleAction=ignore
#IdleActionSec=30min
+#RuntimeDirectorySize=10%
diff --git a/src/login/logind.h b/src/login/logind.h
index 4bb8e7b65a..533554d4bb 100644
--- a/src/login/logind.h
+++ b/src/login/logind.h
@@ -123,6 +123,8 @@ struct Manager {
Hashmap *polkit_registry;
sd_event_source *lid_switch_ignore_event_source;
+
+ size_t runtime_dir_size;
};
Manager *manager_new(void);
@@ -185,3 +187,5 @@ int manager_watch_busname(Manager *manager, const char *name);
void manager_drop_busname(Manager *manager, const char *name);
int manager_set_lid_switch_ignore(Manager *m, usec_t until);
+
+int config_parse_tmpfs_size(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
diff --git a/src/shared/macro.h b/src/shared/macro.h
index 5fd67c7aba..08a036b3b9 100644
--- a/src/shared/macro.h
+++ b/src/shared/macro.h
@@ -98,7 +98,7 @@ static inline size_t ALIGN_TO(size_t l, size_t ali) {
return ((l + ali - 1) & ~(ali - 1));
}
-#define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) p))
+#define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) p, ali))
#define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
diff --git a/src/shared/util.c b/src/shared/util.c
index 285a263cdb..10daff3036 100644
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -6291,3 +6291,15 @@ const char* personality_to_string(unsigned long p) {
return NULL;
}
+
+uint64_t physical_memory(void) {
+ long mem;
+
+ /* We return this as uint64_t in case we are running as 32bit
+ * process on a 64bit kernel with huge amounts of memory */
+
+ mem = sysconf(_SC_PHYS_PAGES);
+ assert(mem > 0);
+
+ return (uint64_t) mem * (uint64_t) page_size();
+}
diff --git a/src/shared/util.h b/src/shared/util.h
index 78b1444739..e4300719a3 100644
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -58,6 +58,14 @@
# error Unknown uid_t size
#endif
+#if SIZEOF_GID_T == 4
+# define GID_FMT "%" PRIu32
+#elif SIZEOF_GID_T == 2
+# define GID_FMT "%" PRIu16
+#else
+# error Unknown gid_t size
+#endif
+
#include "macro.h"
#include "time-util.h"
@@ -883,3 +891,5 @@ int fd_warn_permissions(const char *path, int fd);
unsigned long personality_from_string(const char *p);
const char *personality_to_string(unsigned long);
+
+uint64_t physical_memory(void);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-08 09:21:07 +0000