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ipc: Store mqueue sysctls in the ipc namespace

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Right now, the mqueue sysctls take ipc namespaces into account in a
rather hacky way. This works in most cases, but does not respect the
user namespace.

Within the user namespace, the user cannot change the /proc/sys/fs/mqueue/*
parametres. This poses a problem in the rootless containers.

To solve this I changed the implementation of the mqueue sysctls just
like some other sysctls.

So far, the changes do not provide additional access to files. This will
be done in a future patch.

v3:
* Don't implemenet set_permissions to keep the current behavior.

v2:
* Fixed compilation problem if CONFIG_POSIX_MQUEUE_SYSCTL is not
  specified.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Alexey Gladkov <legion@kernel.org>
Link: https://lkml.kernel.org/r/b0ccbb2489119f1f20c737cf1930c3a9c4e4243a.1644862280.git.legion@kernel.org
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Alexey Gladkov
2022-02-14 19:18:14 +01:00
committed by Eric W. Biederman
parent ffb217a13a
commit dc55e35f9e
4 changed files with 91 additions and 68 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
include/linux/ipc_namespace.h
View File

@@ -10,6 +10,7 @@
#include <linux/ns_common.h>
#include <linux/refcount.h>
#include <linux/rhashtable-types.h>
#include <linux/sysctl.h>
struct user_namespace;
@@ -63,6 +64,9 @@ struct ipc_namespace {
unsigned int mq_msg_default;
unsigned int mq_msgsize_default;
struct ctl_table_set mq_set;
struct ctl_table_header *mq_sysctls;
/* user_ns which owns the ipc ns */
struct user_namespace *user_ns;
struct ucounts *ucounts;
@@ -169,14 +173,18 @@ static inline void put_ipc_ns(struct ipc_namespace *ns)
#ifdef CONFIG_POSIX_MQUEUE_SYSCTL
struct ctl_table_header;
extern struct ctl_table_header *mq_register_sysctl_table(void);
void retire_mq_sysctls(struct ipc_namespace *ns);
bool setup_mq_sysctls(struct ipc_namespace *ns);
#else /* CONFIG_POSIX_MQUEUE_SYSCTL */
static inline struct ctl_table_header *mq_register_sysctl_table(void)
static inline void retire_mq_sysctls(struct ipc_namespace *ns)
{
return NULL;
}
static inline bool setup_mq_sysctls(struct ipc_namespace *ns)
{
return true;
}
#endif /* CONFIG_POSIX_MQUEUE_SYSCTL */