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authorEric W. Biederman <ebiederm@xmission.com>2018-03-22 21:08:27 -0500
committerEric W. Biederman <ebiederm@xmission.com>2018-03-22 21:08:27 -0500
commit7191adff2a5566efb139c79ea03eda3d0520d44a (patch)
treebfde0d973881cfaa21e9993b290de4ca9c5bbe4b /ipc/shm.c
parentaefad9593ec5ad4aae5346253a8b646364cd7317 (diff)
downloadlinux-7191adff2a5566efb139c79ea03eda3d0520d44a.tar.bz2
shm/security: Pass kern_ipc_perm not shmid_kernel into the shm security hooks
All of the implementations of security hooks that take shmid_kernel only access shm_perm the struct kern_ipc_perm member. This means the dependencies of the shm security hooks can be simplified by passing the kern_ipc_perm member of shmid_kernel.. Making this change will allow struct shmid_kernel to become private to ipc/shm.c. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'ipc/shm.c')
-rw-r--r--ipc/shm.c17
1 files changed, 7 insertions, 10 deletions
diff --git a/ipc/shm.c b/ipc/shm.c
index 4643865e9171..387a786e7be1 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -181,7 +181,7 @@ static void shm_rcu_free(struct rcu_head *head)
rcu);
struct shmid_kernel *shp = container_of(ptr, struct shmid_kernel,
shm_perm);
- security_shm_free(shp);
+ security_shm_free(&shp->shm_perm);
kvfree(shp);
}
@@ -554,7 +554,7 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
shp->mlock_user = NULL;
shp->shm_perm.security = NULL;
- error = security_shm_alloc(shp);
+ error = security_shm_alloc(&shp->shm_perm);
if (error) {
kvfree(shp);
return error;
@@ -635,10 +635,7 @@ no_file:
*/
static inline int shm_security(struct kern_ipc_perm *ipcp, int shmflg)
{
- struct shmid_kernel *shp;
-
- shp = container_of(ipcp, struct shmid_kernel, shm_perm);
- return security_shm_associate(shp, shmflg);
+ return security_shm_associate(ipcp, shmflg);
}
/*
@@ -835,7 +832,7 @@ static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd,
shp = container_of(ipcp, struct shmid_kernel, shm_perm);
- err = security_shm_shmctl(shp, cmd);
+ err = security_shm_shmctl(&shp->shm_perm, cmd);
if (err)
goto out_unlock1;
@@ -934,7 +931,7 @@ static int shmctl_stat(struct ipc_namespace *ns, int shmid,
if (ipcperms(ns, &shp->shm_perm, S_IRUGO))
goto out_unlock;
- err = security_shm_shmctl(shp, cmd);
+ err = security_shm_shmctl(&shp->shm_perm, cmd);
if (err)
goto out_unlock;
@@ -978,7 +975,7 @@ static int shmctl_do_lock(struct ipc_namespace *ns, int shmid, int cmd)
}
audit_ipc_obj(&(shp->shm_perm));
- err = security_shm_shmctl(shp, cmd);
+ err = security_shm_shmctl(&shp->shm_perm, cmd);
if (err)
goto out_unlock1;
@@ -1348,7 +1345,7 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg,
if (ipcperms(ns, &shp->shm_perm, acc_mode))
goto out_unlock;
- err = security_shm_shmat(shp, shmaddr, shmflg);
+ err = security_shm_shmat(&shp->shm_perm, shmaddr, shmflg);
if (err)
goto out_unlock;