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ipc: integrate ipc_checkid() into ipc_lock()

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This patch introduces a new ipc_lock_check() routine interface:
   . each time ipc_checkid() is called, this is done after calling ipc_lock().
     ipc_checkid() is now called from inside ipc_lock_check().

[[email protected]: build fix]
[[email protected]: fix RCU locking]
Signed-off-by: Nadia Derbey <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Nadia Derbey 2007-10-18 23:40:51 -07:00 • committed by Linus Torvalds
commit 023a53557e
5 changed files with 152 additions and 136 deletions
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43
ipc/util.h
View file

@ -11,6 +11,7 @@
#define _IPC_UTIL_H
#include <linux/idr.h>
#include <linux/err.h>
#define USHRT_MAX 0xffff
#define SEQ_MULTIPLIER (IPCMNI)
@ -103,11 +104,8 @@ void* ipc_rcu_alloc(int size);
void ipc_rcu_getref(void *ptr);
void ipc_rcu_putref(void *ptr);
struct kern_ipc_perm* ipc_lock(struct ipc_ids* ids, int id);
void ipc_lock_by_ptr(struct kern_ipc_perm *ipcp);
void ipc_unlock(struct kern_ipc_perm* perm);
struct kern_ipc_perm *ipc_lock(struct ipc_ids *, int);
int ipc_buildid(struct ipc_ids* ids, int id, int seq);
int ipc_checkid(struct ipc_ids* ids, struct kern_ipc_perm* ipcp, int uid);
void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out);
void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out);
@ -127,6 +125,43 @@ extern int ipcget_new(struct ipc_namespace *, struct ipc_ids *,
extern int ipcget_public(struct ipc_namespace *, struct ipc_ids *,
struct ipc_ops *, struct ipc_params *);
static inline int ipc_checkid(struct ipc_ids *ids, struct kern_ipc_perm *ipcp,
int uid)
{
if (uid / SEQ_MULTIPLIER != ipcp->seq)
return 1;
return 0;
}
static inline void ipc_lock_by_ptr(struct kern_ipc_perm *perm)
{
rcu_read_lock();
spin_lock(&perm->lock);
}
static inline void ipc_unlock(struct kern_ipc_perm *perm)
{
spin_unlock(&perm->lock);
rcu_read_unlock();
}
static inline struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids,
int id)
{
struct kern_ipc_perm *out;
out = ipc_lock(ids, id);
if (IS_ERR(out))
return out;
if (ipc_checkid(ids, out, id)) {
ipc_unlock(out);
return ERR_PTR(-EIDRM);
}
return out;
}
static inline int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
struct ipc_ops *ops, struct ipc_params *params)
{