This is a note to let you know that I've just added the patch titled
ipc: don't allocate a copy larger than max
to the 3.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ipc-don-t-allocate-a-copy-larger-than-max.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 88b9e456b1649722673ffa147914299799dc9041 Mon Sep 17 00:00:00 2001
From: Peter Hurley <[email protected]>
Date: Fri, 8 Mar 2013 12:43:27 -0800
Subject: ipc: don't allocate a copy larger than max
From: Peter Hurley <[email protected]>
commit 88b9e456b1649722673ffa147914299799dc9041 upstream.
When MSG_COPY is set, a duplicate message must be allocated for the copy
before locking the queue. However, the copy could not be larger than was
sent which is limited to msg_ctlmax.
Signed-off-by: Peter Hurley <[email protected]>
Acked-by: Stanislav Kinsbursky <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
ipc/msg.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -820,15 +820,17 @@ long do_msgrcv(int msqid, void __user *b
struct msg_msg *copy = NULL;
unsigned long copy_number = 0;
+ ns = current->nsproxy->ipc_ns;
+
if (msqid < 0 || (long) bufsz < 0)
return -EINVAL;
if (msgflg & MSG_COPY) {
- copy = prepare_copy(buf, bufsz, msgflg, &msgtyp, ©_number);
+ copy = prepare_copy(buf, min_t(size_t, bufsz, ns->msg_ctlmax),
+ msgflg, &msgtyp, ©_number);
if (IS_ERR(copy))
return PTR_ERR(copy);
}
mode = convert_mode(&msgtyp, msgflg);
- ns = current->nsproxy->ipc_ns;
msq = msg_lock_check(ns, msqid);
if (IS_ERR(msq)) {
Patches currently in stable-queue which might be from [email protected]
are
queue-3.8/ipc-don-t-allocate-a-copy-larger-than-max.patch
queue-3.8/ipc-fix-potential-oops-when-src-msg-4k-w-msg_copy.patch
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