6.6-stable review patch. If anyone has any objections, please let me know.
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From: Alexey Gladkov legion@kernel.org
[ Upstream commit f9436a5d0497f759330d07e1189565edd4456be8 ]
All parameters of posix messages queues (queues_max/msg_max/msgsize_max) end up being limited by RLIMIT_MSGQUEUE. The code in mqueue_get_inode is where that limiting happens.
The RLIMIT_MSGQUEUE is bound to the user namespace and is counted hierarchically.
We can allow root in the user namespace to modify the posix messages queues parameters.
Link: https://lkml.kernel.org/r/6ad67f23d1459a4f4339f74aa73bac0ecf3995e1.170533342... Signed-off-by: Alexey Gladkov legion@kernel.org Signed-off-by: Eric W. Biederman ebiederm@xmission.com Link: https://lkml.kernel.org/r/7eb21211c8622e91d226e63416b1b93c079f60ee.166375679... Cc: Christian Brauner brauner@kernel.org Cc: Davidlohr Bueso dave@stgolabs.net Cc: Joel Granados joel.granados@gmail.com Cc: Kees Cook keescook@chromium.org Cc: Luis Chamberlain mcgrof@kernel.org Cc: Manfred Spraul manfred@colorfullife.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Stable-dep-of: 98ca62ba9e2b ("sysctl: always initialize i_uid/i_gid") Signed-off-by: Sasha Levin sashal@kernel.org --- ipc/mq_sysctl.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+)
diff --git a/ipc/mq_sysctl.c b/ipc/mq_sysctl.c index ebb5ed81c151a..21fba3a6edaf7 100644 --- a/ipc/mq_sysctl.c +++ b/ipc/mq_sysctl.c @@ -12,6 +12,7 @@ #include <linux/stat.h> #include <linux/capability.h> #include <linux/slab.h> +#include <linux/cred.h>
static int msg_max_limit_min = MIN_MSGMAX; static int msg_max_limit_max = HARD_MSGMAX; @@ -76,8 +77,43 @@ static int set_is_seen(struct ctl_table_set *set) return ¤t->nsproxy->ipc_ns->mq_set == set; }
+static void mq_set_ownership(struct ctl_table_header *head, + struct ctl_table *table, + kuid_t *uid, kgid_t *gid) +{ + struct ipc_namespace *ns = + container_of(head->set, struct ipc_namespace, mq_set); + + kuid_t ns_root_uid = make_kuid(ns->user_ns, 0); + kgid_t ns_root_gid = make_kgid(ns->user_ns, 0); + + *uid = uid_valid(ns_root_uid) ? ns_root_uid : GLOBAL_ROOT_UID; + *gid = gid_valid(ns_root_gid) ? ns_root_gid : GLOBAL_ROOT_GID; +} + +static int mq_permissions(struct ctl_table_header *head, struct ctl_table *table) +{ + int mode = table->mode; + kuid_t ns_root_uid; + kgid_t ns_root_gid; + + mq_set_ownership(head, table, &ns_root_uid, &ns_root_gid); + + if (uid_eq(current_euid(), ns_root_uid)) + mode >>= 6; + + else if (in_egroup_p(ns_root_gid)) + mode >>= 3; + + mode &= 7; + + return (mode << 6) | (mode << 3) | mode; +} + static struct ctl_table_root set_root = { .lookup = set_lookup, + .permissions = mq_permissions, + .set_ownership = mq_set_ownership, };
bool setup_mq_sysctls(struct ipc_namespace *ns)