path: root/ipc/util.h
diff options
authorLinus Torvalds <>2018-04-03 19:15:32 -0700
committerLinus Torvalds <>2018-04-03 19:15:32 -0700
commit17dec0a949153d9ac00760ba2f5b78cb583e995f (patch)
treeaaf44fee3aca81a86ecfa46f3f409d5cf5675f1f /ipc/util.h
parentd92cd810e64aa7cf22b05f0ea1c7d3e8dbae75fe (diff)
parent2236d4d39035b9839944603ec4b65ce71180a9ea (diff)
Merge branch 'userns-linus' of git://
Pull namespace updates from Eric Biederman: "There was a lot of work this cycle fixing bugs that were discovered after the merge window and getting everything ready where we can reasonably support fully unprivileged fuse. The bug fixes you already have and much of the unprivileged fuse work is coming in via other trees. Still left for fully unprivileged fuse is figuring out how to cleanly handle .set_acl and .get_acl in the legacy case, and properly handling of evm xattrs on unprivileged mounts. Included in the tree is a cleanup from Alexely that replaced a linked list with a statically allocated fix sized array for the pid caches, which simplifies and speeds things up. Then there is are some cleanups and fixes for the ipc namespace. The motivation was that in reviewing other code it was discovered that access ipc objects from different pid namespaces recorded pids in such a way that when asked the wrong pids were returned. In the worst case there has been a measured 30% performance impact for sysvipc semaphores. Other test cases showed no measurable performance impact. Manfred Spraul and Davidlohr Bueso who tend to work on sysvipc performance both gave the nod that this is good enough. Casey Schaufler and James Morris have given their approval to the LSM side of the changes. I simplified the types and the code dealing with sysvipc to pass just kern_ipc_perm for all three types of ipc. Which reduced the header dependencies throughout the kernel and simplified the lsm code. Which let me work on the pid fixes without having to worry about trivial changes causing complete kernel recompiles" * 'userns-linus' of git:// ipc/shm: Fix pid freeing. ipc/shm: fix up for struct file no longer being available in shm.h ipc/smack: Tidy up from the change in type of the ipc security hooks ipc: Directly call the security hook in ipc_ops.associate ipc/sem: Fix semctl(..., GETPID, ...) between pid namespaces ipc/msg: Fix msgctl(..., IPC_STAT, ...) between pid namespaces ipc/shm: Fix shmctl(..., IPC_STAT, ...) between pid namespaces. ipc/util: Helpers for making the sysvipc operations pid namespace aware ipc: Move IPCMNI from include/ipc.h into ipc/util.h msg: Move struct msg_queue into ipc/msg.c shm: Move struct shmid_kernel into ipc/shm.c sem: Move struct sem and struct sem_array into ipc/sem.c msg/security: Pass kern_ipc_perm not msg_queue into the msg_queue security hooks shm/security: Pass kern_ipc_perm not shmid_kernel into the shm security hooks sem/security: Pass kern_ipc_perm not sem_array into the sem security hooks pidns: simpler allocation of pid_* caches
Diffstat (limited to 'ipc/util.h')
1 files changed, 12 insertions, 0 deletions
diff --git a/ipc/util.h b/ipc/util.h
index 51853dc2f340..acc5159e96d0 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -15,6 +15,7 @@
#include <linux/err.h>
#include <linux/ipc_namespace.h>
+#define IPCMNI 32768 /* <= MAX_INT limit for ipc arrays (including sysctl changes) */
int sem_init(void);
@@ -22,6 +23,7 @@ int msg_init(void);
void shm_init(void);
struct ipc_namespace;
+struct pid_namespace;
extern void mq_clear_sbinfo(struct ipc_namespace *ns);
@@ -85,6 +87,7 @@ int ipc_init_ids(struct ipc_ids *);
void __init ipc_init_proc_interface(const char *path, const char *header,
int ids, int (*show)(struct seq_file *, void *));
+struct pid_namespace *ipc_seq_pid_ns(struct seq_file *);
#define ipc_init_proc_interface(path, header, ids, show) do {} while (0)
@@ -149,6 +152,15 @@ struct kern_ipc_perm *ipcctl_pre_down_nolock(struct ipc_namespace *ns,
struct ipc_ids *ids, int id, int cmd,
struct ipc64_perm *perm, int extra_perm);
+static inline void ipc_update_pid(struct pid **pos, struct pid *pid)
+ struct pid *old = *pos;
+ if (old != pid) {
+ *pos = get_pid(pid);
+ put_pid(old);
+ }
/* On IA-64, we always use the "64-bit version" of the IPC structures. */
# define ipc_parse_version(cmd) IPC_64