This is a note to let you know that I've just added the patch titled
rpc: let xdr layer allocate gssproxy receieve pages
to the 3.10-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:
rpc-let-xdr-layer-allocate-gssproxy-receieve-pages.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From d4a516560fc96a9d486a9939bcb567e3fdce8f49 Mon Sep 17 00:00:00 2001
From: "J. Bruce Fields" <[email protected]>
Date: Fri, 23 Aug 2013 17:26:28 -0400
Subject: rpc: let xdr layer allocate gssproxy receieve pages
From: "J. Bruce Fields" <[email protected]>
commit d4a516560fc96a9d486a9939bcb567e3fdce8f49 upstream.
In theory the linux cred in a gssproxy reply can include up to
NGROUPS_MAX data, 256K of data. In the common case we expect it to be
shorter. So do as the nfsv3 ACL code does and let the xdr code allocate
the pages as they come in, instead of allocating a lot of pages that
won't typically be used.
Tested-by: Simo Sorce <[email protected]>
Signed-off-by: J. Bruce Fields <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/sunrpc/auth_gss/gss_rpc_upcall.c | 16 ++++++----------
1 file changed, 6 insertions(+), 10 deletions(-)
--- a/net/sunrpc/auth_gss/gss_rpc_upcall.c
+++ b/net/sunrpc/auth_gss/gss_rpc_upcall.c
@@ -223,18 +223,14 @@ static void gssp_free_receive_pages(stru
static int gssp_alloc_receive_pages(struct gssx_arg_accept_sec_context *arg)
{
- int i;
-
arg->npages = DIV_ROUND_UP(NGROUPS_MAX * 4, PAGE_SIZE);
arg->pages = kzalloc(arg->npages * sizeof(struct page *), GFP_KERNEL);
-
- for (i=0; i < arg->npages; i++) {
- arg->pages[i] = alloc_page(GFP_KERNEL);
- if (arg->pages[i] == NULL) {
- gssp_free_receive_pages(arg);
- return -ENOMEM;
- }
- }
+ /*
+ * XXX: actual pages are allocated by xdr layer in
+ * xdr_partial_copy_from_skb.
+ */
+ if (!arg->pages)
+ return -ENOMEM;
return 0;
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.10/rpc-clean-up-decoding-of-gssproxy-linux-creds.patch
queue-3.10/rpc-let-xdr-layer-allocate-gssproxy-receieve-pages.patch
queue-3.10/rpc-comment-on-linux_cred-encoding-treat-all-as-unsigned.patch
queue-3.10/rpc-fix-huge-kmalloc-s-in-gss-proxy.patch
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