The patch titled
Subject: ipc/mqueue: strengthen checks on mqueue creation
has been removed from the -mm tree. Its filename was
ipc-mqueue-strengthen-checks-on-mqueue-creation.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
From: Doug Ledford <dledford@xxxxxxxxxx>
Subject: ipc/mqueue: strengthen checks on mqueue creation
We already check the mq attr struct if it's passed in, but now that the
admin can set system wide defaults separate from maximums, it's actually
possible to set the defaults to something that would overflow. So, if
there is no attr struct passed in to the open call, check the default
values.
While we are at it, simplify mq_attr_ok() by making it return 0 or an
error condition, so that way if we add more tests to it later, we have the
option of what error should be returned instead of the calling location
having to pick a possibly inaccurate error code.
[akpm@xxxxxxxxxxxxxxxxxxxx: s/ENOMEM/EOVERFLOW/]
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Cc: Manfred Spraul <manfred@xxxxxxxxxxxxxxxx>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
ipc/mqueue.c | 27 ++++++++++++++++++---------
1 file changed, 18 insertions(+), 9 deletions(-)
diff -puN ipc/mqueue.c~ipc-mqueue-strengthen-checks-on-mqueue-creation ipc/mqueue.c
--- a/ipc/mqueue.c~ipc-mqueue-strengthen-checks-on-mqueue-creation
+++ a/ipc/mqueue.c
@@ -680,26 +680,26 @@ static int mq_attr_ok(struct ipc_namespa
unsigned long total_size;
if (attr->mq_maxmsg <= 0 || attr->mq_msgsize <= 0)
- return 0;
+ return -EINVAL;
if (capable(CAP_SYS_RESOURCE)) {
if (attr->mq_maxmsg > HARD_MSGMAX ||
attr->mq_msgsize > HARD_MSGSIZEMAX)
- return 0;
+ return -EINVAL;
} else {
if (attr->mq_maxmsg > ipc_ns->mq_msg_max ||
attr->mq_msgsize > ipc_ns->mq_msgsize_max)
- return 0;
+ return -EINVAL;
}
/* check for overflow */
if (attr->mq_msgsize > ULONG_MAX/attr->mq_maxmsg)
- return 0;
+ return -EOVERFLOW;
mq_treesize = attr->mq_maxmsg * sizeof(struct msg_msg) +
min_t(unsigned int, attr->mq_maxmsg, MQ_PRIO_MAX) *
sizeof(struct posix_msg_tree_node);
total_size = attr->mq_maxmsg * attr->mq_msgsize;
if (total_size + mq_treesize < total_size)
- return 0;
- return 1;
+ return -EOVERFLOW;
+ return 0;
}
/*
@@ -714,12 +714,21 @@ static struct file *do_create(struct ipc
int ret;
if (attr) {
- if (!mq_attr_ok(ipc_ns, attr)) {
- ret = -EINVAL;
+ ret = mq_attr_ok(ipc_ns, attr);
+ if (ret)
goto out;
- }
/* store for use during create */
dentry->d_fsdata = attr;
+ } else {
+ struct mq_attr def_attr;
+
+ def_attr.mq_maxmsg = min(ipc_ns->mq_msg_max,
+ ipc_ns->mq_msg_default);
+ def_attr.mq_msgsize = min(ipc_ns->mq_msgsize_max,
+ ipc_ns->mq_msgsize_default);
+ ret = mq_attr_ok(ipc_ns, &def_attr);
+ if (ret)
+ goto out;
}
mode &= ~current_umask();
_
Patches currently in -mm which might be from dledford@xxxxxxxxxx are
origin.patch
tools-selftests-add-mq_perf_tests.patch
ipc-mqueue-add-rbtree-node-caching-support.patch
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