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authorManfred Spraul <manfred@colorfullife.com>2018-08-21 22:01:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-22 10:52:51 -0700
commite2652ae6bd7492cdc0436817cbcd09282eb0bb03 (patch)
tree3736e02fc0a194548e10bf40680b22d737f6b320 /ipc
parent615c999cd8a07b7c3c93bbdee89ef705d2ce52e1 (diff)
downloadlinux-stericsson-e2652ae6bd7492cdc0436817cbcd09282eb0bb03.tar.gz
ipc: reorganize initialization of kern_ipc_perm.seq
ipc_addid() initializes kern_ipc_perm.seq after having called idr_alloc() (within ipc_idr_alloc()). Thus a parallel semop() or msgrcv() that uses ipc_obtain_object_check() may see an uninitialized value. The patch moves the initialization of kern_ipc_perm.seq before the calls of idr_alloc(). Notes: 1) This patch has a user space visible side effect: If /proc/sys/kernel/*_next_id is used (i.e.: checkpoint/restore) and if semget()/msgget()/shmget() fails in the final step of adding the id to the rhash tree, then .._next_id is cleared. Before the patch, is remained unmodified. There is no change of the behavior after a successful ..get() call: It always clears .._next_id, there is no impact to non checkpoint/restore code as that code does not use .._next_id. 2) The patch correctly documents that after a call to ipc_idr_alloc(), the full tear-down sequence must be used. The callers of ipc_addid() do not fullfill that, i.e. more bugfixes are required. The patch is a squash of a patch from Dmitry and my own changes. Link: http://lkml.kernel.org/r/20180712185241.4017-3-manfred@colorfullife.com Reported-by: syzbot+2827ef6b3385deb07eaf@syzkaller.appspotmail.com Signed-off-by: Manfred Spraul <manfred@colorfullife.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Kees Cook <keescook@chromium.org> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc')
-rw-r--r--ipc/util.c91
1 files changed, 48 insertions, 43 deletions
diff --git a/ipc/util.c b/ipc/util.c
index fdffff41f65b..e5c9e2b2e4c4 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -194,46 +194,54 @@ static struct kern_ipc_perm *ipc_findkey(struct ipc_ids *ids, key_t key)
return NULL;
}
-#ifdef CONFIG_CHECKPOINT_RESTORE
/*
- * Specify desired id for next allocated IPC object.
+ * Insert new IPC object into idr tree, and set sequence number and id
+ * in the correct order.
+ * Especially:
+ * - the sequence number must be set before inserting the object into the idr,
+ * because the sequence number is accessed without a lock.
+ * - the id can/must be set after inserting the object into the idr.
+ * All accesses must be done after getting kern_ipc_perm.lock.
+ *
+ * The caller must own kern_ipc_perm.lock.of the new object.
+ * On error, the function returns a (negative) error code.
*/
-#define ipc_idr_alloc(ids, new) \
- idr_alloc(&(ids)->ipcs_idr, (new), \
- (ids)->next_id < 0 ? 0 : ipcid_to_idx((ids)->next_id),\
- 0, GFP_NOWAIT)
-
-static inline int ipc_buildid(int id, struct ipc_ids *ids,
- struct kern_ipc_perm *new)
+static inline int ipc_idr_alloc(struct ipc_ids *ids, struct kern_ipc_perm *new)
{
- if (ids->next_id < 0) { /* default, behave as !CHECKPOINT_RESTORE */
+ int idx, next_id = -1;
+
+#ifdef CONFIG_CHECKPOINT_RESTORE
+ next_id = ids->next_id;
+ ids->next_id = -1;
+#endif
+
+ /*
+ * As soon as a new object is inserted into the idr,
+ * ipc_obtain_object_idr() or ipc_obtain_object_check() can find it,
+ * and the lockless preparations for ipc operations can start.
+ * This means especially: permission checks, audit calls, allocation
+ * of undo structures, ...
+ *
+ * Thus the object must be fully initialized, and if something fails,
+ * then the full tear-down sequence must be followed.
+ * (i.e.: set new->deleted, reduce refcount, call_rcu())
+ */
+
+ if (next_id < 0) { /* !CHECKPOINT_RESTORE or next_id is unset */
new->seq = ids->seq++;
if (ids->seq > IPCID_SEQ_MAX)
ids->seq = 0;
+ idx = idr_alloc(&ids->ipcs_idr, new, 0, 0, GFP_NOWAIT);
} else {
- new->seq = ipcid_to_seqx(ids->next_id);
- ids->next_id = -1;
+ new->seq = ipcid_to_seqx(next_id);
+ idx = idr_alloc(&ids->ipcs_idr, new, ipcid_to_idx(next_id),
+ 0, GFP_NOWAIT);
}
-
- return SEQ_MULTIPLIER * new->seq + id;
+ if (idx >= 0)
+ new->id = SEQ_MULTIPLIER * new->seq + idx;
+ return idx;
}
-#else
-#define ipc_idr_alloc(ids, new) \
- idr_alloc(&(ids)->ipcs_idr, (new), 0, 0, GFP_NOWAIT)
-
-static inline int ipc_buildid(int id, struct ipc_ids *ids,
- struct kern_ipc_perm *new)
-{
- new->seq = ids->seq++;
- if (ids->seq > IPCID_SEQ_MAX)
- ids->seq = 0;
-
- return SEQ_MULTIPLIER * new->seq + id;
-}
-
-#endif /* CONFIG_CHECKPOINT_RESTORE */
-
/**
* ipc_addid - add an ipc identifier
* @ids: ipc identifier set
@@ -251,7 +259,7 @@ int ipc_addid(struct ipc_ids *ids, struct kern_ipc_perm *new, int limit)
{
kuid_t euid;
kgid_t egid;
- int id, err;
+ int idx, err;
if (limit > IPCMNI)
limit = IPCMNI;
@@ -271,30 +279,27 @@ int ipc_addid(struct ipc_ids *ids, struct kern_ipc_perm *new, int limit)
new->cuid = new->uid = euid;
new->gid = new->cgid = egid;
- id = ipc_idr_alloc(ids, new);
+ idx = ipc_idr_alloc(ids, new);
idr_preload_end();
- if (id >= 0 && new->key != IPC_PRIVATE) {
+ if (idx >= 0 && new->key != IPC_PRIVATE) {
err = rhashtable_insert_fast(&ids->key_ht, &new->khtnode,
ipc_kht_params);
if (err < 0) {
- idr_remove(&ids->ipcs_idr, id);
- id = err;
+ idr_remove(&ids->ipcs_idr, idx);
+ idx = err;
}
}
- if (id < 0) {
+ if (idx < 0) {
spin_unlock(&new->lock);
rcu_read_unlock();
- return id;
+ return idx;
}
ids->in_use++;
- if (id > ids->max_id)
- ids->max_id = id;
-
- new->id = ipc_buildid(id, ids, new);
-
- return id;
+ if (idx > ids->max_id)
+ ids->max_id = idx;
+ return idx;
}
/**