The problem is SysV SHM is that , it will cause kernel resource leak.
Initailly set shm mode to SHM_DEST when create with key_t IPC_PRIVATE,
then the resource leak is fixed.
If program want the shmid live longer, they will probably use non
IPC_PRIVATE nor call shmctl that remove SHM_DEST bit.
---
ipc/shm.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/ipc/shm.c b/ipc/shm.c
index 41c1285..1abc031 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -480,6 +480,8 @@ static int newseg(struct ipc_namespace *ns, struct
ipc_params *params)
shp->shm_perm.key = key;
shp->shm_perm.mode = (shmflg & S_IRWXUGO);
+ if(key == IPC_PRIVATE)
+ shp->shm_perm.mode |= SHM_DEST;
shp->mlock_user = NULL;
shp->shm_perm.security = NULL;
--
1.7.8.6
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