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systemd
0001-core-introduce-new-Delegate-yes-no-propert...
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File 0001-core-introduce-new-Delegate-yes-no-property-controll.patch of Package systemd
Based on a931ad47a8623163a29d898224d8a8c1177ffdaf Mon Sep 17 00:00:00 2001 From: Lennart Poettering <lennart@poettering.net> Date: Wed, 5 Nov 2014 17:57:23 +0100 Subject: [PATCH] core: introduce new Delegate=yes/no property controlling creation of cgroup subhierarchies For priviliged units this resource control property ensures that the processes have all controllers systemd manages enabled. For unpriviliged services (those with User= set) this ensures that access rights to the service cgroup is granted to the user in question, to create further subgroups. Note that this only applies to the name=systemd hierarchy though, as access to other controllers is not safe for unpriviliged processes. Delegate=yes should be set for container scopes where a systemd instance inside the container shall manage the hierarchies below its own cgroup and have access to all controllers. Delegate=yes should also be set for user@.service, so that systemd --user can run, controlling its own cgroup tree. This commit changes machined, systemd-nspawn@.service and user@.service to set this boolean, in order to ensure that container management will just work, and the user systemd instance can run fine. --- man/systemd.resource-control.xml | 14 +++++++++++ src/core/cgroup.c | 22 +++++++++++++++-- src/core/cgroup.h | 2 + src/core/dbus-cgroup.c | 42 ++++++++++++++++++++++++++++++++++ src/core/execute.c | 21 ++++++++++++++++- src/core/execute.h | 2 + src/core/load-fragment-gperf.gperf.m4 | 3 +- src/core/mount.c | 1 src/core/service.c | 1 src/core/socket.c | 1 src/core/swap.c | 1 src/machine/machined-dbus.c | 4 +++ src/shared/cgroup-util.h | 3 +- units/systemd-nspawn@.service.in | 1 units/user@.service.in | 1 15 files changed, 113 insertions(+), 6 deletions(-) --- man/systemd.resource-control.xml +++ man/systemd.resource-control.xml 2015-09-03 00:00:00.000000000 +0000 @@ -342,6 +342,20 @@ along with systemd; If not, see <http:// </listitem> </varlistentry> + <varlistentry> + <term><varname>Delegate=</varname></term> + + <listitem> + <para>Turns on delegation of further resource control + partitioning to processes of the unit. For unpriviliged + services (i.e. those using the <varname>User=</varname> + setting) this allows processes to create a subhierarchy + beneath its control group path. For priviliged services and + scopes this ensures the processes will have all control + group controllers enabled.</para> + </listitem> + </varlistentry> + </variablelist> </refsect1> --- src/core/cgroup.c +++ src/core/cgroup.c 2015-09-03 00:00:00.000000000 +0000 @@ -94,14 +94,16 @@ void cgroup_context_dump(CGroupContext * "%sCPUShares=%lu\n" "%sBlockIOWeight=%lu\n" "%sMemoryLimit=%" PRIu64 "\n" - "%sDevicePolicy=%s\n", + "%sDevicePolicy=%s\n" + "%sDelegate=%s\n", prefix, yes_no(c->cpu_accounting), prefix, yes_no(c->blockio_accounting), prefix, yes_no(c->memory_accounting), prefix, c->cpu_shares, prefix, c->blockio_weight, prefix, c->memory_limit, - prefix, cgroup_device_policy_to_string(c->device_policy)); + prefix, cgroup_device_policy_to_string(c->device_policy), + prefix, yes_no(c->delegate)); LIST_FOREACH(device_allow, a, c->device_allow) fprintf(f, @@ -420,7 +422,8 @@ CGroupControllerMask cgroup_context_get_ c->memory_limit != (uint64_t) -1) mask |= CGROUP_MEMORY; - if (c->device_allow || c->device_policy != CGROUP_AUTO) + if (c->device_allow || + c->device_policy != CGROUP_AUTO) mask |= CGROUP_DEVICE; return mask; @@ -433,6 +436,19 @@ CGroupControllerMask unit_get_cgroup_mas if (!c) return 0; + /* If delegation is turned on, then turn on all cgroups, + * unless the process we fork into it is known to drop + * privileges anyway, and shouldn't get access to the + * controllers anyway. */ + + if (c->delegate) { + ExecContext *e; + + e = unit_get_exec_context(u); + if (!e || exec_context_maintains_privileges(e)) + return _CGROUP_CONTROLLER_MASK_ALL; + } + return cgroup_context_get_mask(c); } --- src/core/cgroup.h +++ src/core/cgroup.h 2015-09-03 00:00:00.000000000 +0000 @@ -80,6 +80,8 @@ struct CGroupContext { CGroupDevicePolicy device_policy; LIST_HEAD(CGroupDeviceAllow, device_allow); + + bool delegate; }; #include "unit.h" --- src/core/dbus-cgroup.c +++ src/core/dbus-cgroup.c 2015-09-03 00:00:00.000000000 +0000 @@ -135,6 +135,7 @@ static int property_get_device_allow( const sd_bus_vtable bus_cgroup_vtable[] = { SD_BUS_VTABLE_START(0), + SD_BUS_PROPERTY("Delegate", "b", bus_property_get_bool, offsetof(CGroupContext, delegate), 0), SD_BUS_PROPERTY("CPUAccounting", "b", bus_property_get_bool, offsetof(CGroupContext, cpu_accounting), 0), SD_BUS_PROPERTY("CPUShares", "t", bus_property_get_ulong, offsetof(CGroupContext, cpu_shares), 0), SD_BUS_PROPERTY("BlockIOAccounting", "b", bus_property_get_bool, offsetof(CGroupContext, blockio_accounting), 0), @@ -149,6 +150,39 @@ const sd_bus_vtable bus_cgroup_vtable[] SD_BUS_VTABLE_END }; +static int bus_cgroup_set_transient_property( + Unit *u, + CGroupContext *c, + const char *name, + sd_bus_message *message, + UnitSetPropertiesMode mode, + sd_bus_error *error) { + + int r; + + assert(u); + assert(c); + assert(name); + assert(message); + + if (streq(name, "Delegate")) { + int b; + + r = sd_bus_message_read(message, "b", &b); + if (r < 0) + return r; + + if (mode != UNIT_CHECK) { + c->delegate = b; + unit_write_drop_in_private(u, mode, name, b ? "Delegate=yes" : "Delegate=no"); + } + + return 1; + } + + return 0; +} + int bus_cgroup_set_property( Unit *u, CGroupContext *c, @@ -524,6 +558,14 @@ int bus_cgroup_set_property( } return 1; + + } + + if (u->transient && u->load_state == UNIT_STUB) { + r = bus_cgroup_set_transient_property(u, c, name, message, mode, error); + if (r != 0) + return r; + } return 0; --- src/core/execute.c +++ src/core/execute.c 2015-09-03 13:52:05.565519307 +0000 @@ -1167,6 +1167,7 @@ int exec_spawn(ExecCommand *command, bool selinux_context_net, CGroupControllerMask cgroup_supported, const char *cgroup_path, + bool cgroup_delegate, const char *unit_id, usec_t watchdog_usec, int idle_pipe[4], @@ -1448,7 +1449,10 @@ int exec_spawn(ExecCommand *command, } #ifdef HAVE_PAM - if (cgroup_path && context->user && context->pam_name) { + /* If delegation is enabled we'll pass ownership of the cgroup + * (but only in systemd's own controller hierarchy!) to the + * user of the new process. */ + if (cgroup_path && context->user && cgroup_delegate) { err = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, 0644, uid, gid); if (err < 0) { r = EXIT_CGROUP; @@ -2273,6 +2277,21 @@ void exec_context_dump(ExecContext *c, F prefix, c->apparmor_profile_ignore ? "-" : "", c->apparmor_profile); } +bool exec_context_maintains_privileges(ExecContext *c) { + assert(c); + + /* Returns true if the process forked off would run run under + * an unchanged UID or as root. */ + + if (!c->user) + return true; + + if (streq(c->user, "root") || streq(c->user, "0")) + return true; + + return false; +} + void exec_status_start(ExecStatus *s, pid_t pid) { assert(s); --- src/core/execute.h +++ src/core/execute.h 2015-09-03 14:07:06.605520883 +0000 @@ -198,6 +198,7 @@ int exec_spawn(ExecCommand *command, bool selinux_context_net, CGroupControllerMask cgroup_mask, const char *cgroup_path, + bool cgroup_delegate, const char *unit_id, usec_t watchdog_usec, int pipe_fd[2], @@ -224,6 +225,7 @@ void exec_context_dump(ExecContext *c, F int exec_context_load_environment(const ExecContext *c, char ***l); bool exec_context_may_touch_console(ExecContext *c); +bool exec_context_maintains_privileges(ExecContext *c); void exec_status_start(ExecStatus *s, pid_t pid); void exec_status_exit(ExecStatus *s, ExecContext *context, pid_t pid, int code, int status); --- src/core/load-fragment-gperf.gperf.m4 +++ src/core/load-fragment-gperf.gperf.m4 2015-09-03 00:00:00.000000000 +0000 @@ -113,7 +113,8 @@ $1.BlockIOAccounting, config_ $1.BlockIOWeight, config_parse_blockio_weight, 0, offsetof($1, cgroup_context) $1.BlockIODeviceWeight, config_parse_blockio_device_weight, 0, offsetof($1, cgroup_context) $1.BlockIOReadBandwidth, config_parse_blockio_bandwidth, 0, offsetof($1, cgroup_context) -$1.BlockIOWriteBandwidth, config_parse_blockio_bandwidth, 0, offsetof($1, cgroup_context)' +$1.BlockIOWriteBandwidth, config_parse_blockio_bandwidth, 0, offsetof($1, cgroup_context) +$1.Delegate, config_parse_bool, 0, offsetof($1, cgroup_context.delegate)' )m4_dnl Unit.Description, config_parse_unit_string_printf, 0, offsetof(Unit, description) Unit.Documentation, config_parse_documentation, 0, offsetof(Unit, documentation) --- src/core/mount.c +++ src/core/mount.c 2015-09-03 13:54:24.641520584 +0000 @@ -816,6 +816,7 @@ static int mount_spawn(Mount *m, ExecCom false, UNIT(m)->manager->cgroup_supported, UNIT(m)->cgroup_path, + m->cgroup_context.delegate, UNIT(m)->id, 0, NULL, --- src/core/service.c +++ src/core/service.c 2015-09-03 13:59:14.850018797 +0000 @@ -1867,6 +1867,7 @@ static int service_spawn( s->socket_fd_selinux_context_net, UNIT(s)->manager->cgroup_supported, path, + s->cgroup_context.delegate, UNIT(s)->id, s->watchdog_usec, s->type == SERVICE_IDLE ? UNIT(s)->manager->idle_pipe : NULL, --- src/core/socket.c +++ src/core/socket.c 2015-09-03 13:59:07.806018550 +0000 @@ -1257,6 +1257,7 @@ static int socket_spawn(Socket *s, ExecC s->selinux_context_from_net, UNIT(s)->manager->cgroup_supported, UNIT(s)->cgroup_path, + s->cgroup_context.delegate, UNIT(s)->id, 0, NULL, --- src/core/swap.c +++ src/core/swap.c 2015-09-03 13:59:02.081519346 +0000 @@ -648,6 +648,7 @@ static int swap_spawn(Swap *s, ExecComma false, UNIT(s)->manager->cgroup_supported, UNIT(s)->cgroup_path, + s->cgroup_context.delegate, UNIT(s)->id, 0, NULL, --- src/machine/machined-dbus.c +++ src/machine/machined-dbus.c 2015-09-03 00:00:00.000000000 +0000 @@ -571,6 +571,10 @@ int manager_start_scope( if (r < 0) return r; + r = sd_bus_message_append(m, "(sv)", "Delegate", "b", 1); + if (r < 0) + return r; + if (more_properties) { r = sd_bus_message_copy(m, more_properties, true); if (r < 0) --- src/shared/cgroup-util.h +++ src/shared/cgroup-util.h 2015-09-03 00:00:00.000000000 +0000 @@ -34,7 +34,8 @@ typedef enum CGroupControllerMask { CGROUP_CPUACCT = 2, CGROUP_BLKIO = 4, CGROUP_MEMORY = 8, - CGROUP_DEVICE = 16 + CGROUP_DEVICE = 16, + _CGROUP_CONTROLLER_MASK_ALL = 31 } CGroupControllerMask; /* --- units/systemd-nspawn@.service.in +++ units/systemd-nspawn@.service.in 2015-09-03 14:00:02.818019437 +0000 @@ -13,6 +13,7 @@ Documentation=man:systemd-nspawn(1) ExecStart=@bindir@/systemd-nspawn --quiet --keep-unit --boot --link-journal=guest --directory=/var/lib/container/%i KillMode=mixed Type=notify +Delegate=yes [Install] WantedBy=multi-user.target --- units/user@.service.in +++ units/user@.service.in 2015-09-03 00:00:00.000000000 +0000 @@ -16,3 +16,4 @@ Type=notify ExecStart=-@rootlibexecdir@/systemd --user Slice=user-%i.slice KillMode=mixed +Delegate=yes
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