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Fix large order rpc allocations (rhbz 997705) 

- Fix multimedia keys on Genius GX keyboard (rhbz 928561)
This commit is contained in:
Josh Boyer 2013-09-20 10:31:39 -04:00
parent 1b87d09575
commit 80641a0bb8
5 changed files with 378 additions and 0 deletions
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13
kernel.spec
View File

@ -763,6 +763,12 @@ Patch25104: ansi_cprng-Fix-off-by-one-error-in-non-block-size-request.patch
#rhbz 928561
Patch25105: 0001-HID-kye-Add-report-fixup-for-Genius-Gx-Imperator-Key.patch
#rhbz 997705
Patch25110: rpc-clean-up-decoding-of-gssproxy-linux-creds.patch
Patch25111: rpc-comment-on-linux_cred-encoding-treat-all-as-unsigned.patch
Patch25112: rpc-fix-huge-kmallocs-in-gss-proxy.patch
Patch25113: rpc-let-xdr-layer-allocate-gssproxy-receieve-pages.patch
# END OF PATCH DEFINITIONS
%endif
@ -1474,6 +1480,12 @@ ApplyPatch ansi_cprng-Fix-off-by-one-error-in-non-block-size-request.patch
#rhbz 928561
ApplyPatch 0001-HID-kye-Add-report-fixup-for-Genius-Gx-Imperator-Key.patch
#rhbz 997705
ApplyPatch rpc-clean-up-decoding-of-gssproxy-linux-creds.patch
ApplyPatch rpc-comment-on-linux_cred-encoding-treat-all-as-unsigned.patch
ApplyPatch rpc-fix-huge-kmallocs-in-gss-proxy.patch
ApplyPatch rpc-let-xdr-layer-allocate-gssproxy-receieve-pages.patch
# END OF PATCH APPLICATIONS
%endif
@ -2287,6 +2299,7 @@ fi
%changelog
* Fri Sep 20 2013 Josh Boyer <jwboyer@fedoraproject.org>
- Fix large order rpc allocations (rhbz 997705)
- Fix multimedia keys on Genius GX keyboard (rhbz 928561)
* Tue Sep 17 2013 Josh Boyer <jwboyer@fedoraproject.org>

110
rpc-clean-up-decoding-of-gssproxy-linux-creds.patch Normal file
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@ -0,0 +1,110 @@
From: "J. Bruce Fields" <bfields@redhat.com>
commit 778e512bb1d3315c6b55832248cd30c566c081d7 upstream.
We can use the normal coding infrastructure here.
Two minor behavior changes:
- we're assuming no wasted space at the end of the linux cred.
That seems to match gss-proxy's behavior, and I can't see why
it would need to do differently in the future.
- NGROUPS_MAX check added: note groups_alloc doesn't do this,
this is the caller's responsibility.
Tested-by: Simo Sorce <simo@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
---
net/sunrpc/auth_gss/gss_rpc_xdr.c | 32 +++++++++++++-------------------
1 file changed, 13 insertions(+), 19 deletions(-)
diff --git a/net/sunrpc/auth_gss/gss_rpc_xdr.c b/net/sunrpc/auth_gss/gss_rpc_xdr.c
index 3c85d1c..f5067b2 100644
--- a/net/sunrpc/auth_gss/gss_rpc_xdr.c
+++ b/net/sunrpc/auth_gss/gss_rpc_xdr.c
@@ -166,14 +166,14 @@ static int dummy_dec_opt_array(struct xdr_stream *xdr,
return 0;
}
-static int get_s32(void **p, void *max, s32 *res)
+static int get_s32(struct xdr_stream *xdr, s32 *res)
{
- void *base = *p;
- void *next = (void *)((char *)base + sizeof(s32));
- if (unlikely(next > max || next < base))
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, 4);
+ if (!p)
return -EINVAL;
- memcpy(res, base, sizeof(s32));
- *p = next;
+ memcpy(res, p, sizeof(s32));
return 0;
}
@@ -182,7 +182,6 @@ static int gssx_dec_linux_creds(struct xdr_stream *xdr,
{
u32 length;
__be32 *p;
- void *q, *end;
s32 tmp;
int N, i, err;
@@ -192,33 +191,28 @@ static int gssx_dec_linux_creds(struct xdr_stream *xdr,
length = be32_to_cpup(p);
- /* FIXME: we do not want to use the scratch buffer for this one
- * may need to use functions that allows us to access an io vector
- * directly */
- p = xdr_inline_decode(xdr, length);
- if (unlikely(p == NULL))
+ if (length > (3 + NGROUPS_MAX) * sizeof(u32))
return -ENOSPC;
- q = p;
- end = q + length;
-
/* uid */
- err = get_s32(&q, end, &tmp);
+ err = get_s32(xdr, &tmp);
if (err)
return err;
creds->cr_uid = make_kuid(&init_user_ns, tmp);
/* gid */
- err = get_s32(&q, end, &tmp);
+ err = get_s32(xdr, &tmp);
if (err)
return err;
creds->cr_gid = make_kgid(&init_user_ns, tmp);
/* number of additional gid's */
- err = get_s32(&q, end, &tmp);
+ err = get_s32(xdr, &tmp);
if (err)
return err;
N = tmp;
+ if ((3 + N) * sizeof(u32) != length)
+ return -EINVAL;
creds->cr_group_info = groups_alloc(N);
if (creds->cr_group_info == NULL)
return -ENOMEM;
@@ -226,7 +220,7 @@ static int gssx_dec_linux_creds(struct xdr_stream *xdr,
/* gid's */
for (i = 0; i < N; i++) {
kgid_t kgid;
- err = get_s32(&q, end, &tmp);
+ err = get_s32(xdr, &tmp);
if (err)
goto out_free_groups;
err = -EINVAL;
--
1.7.9.5
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90
rpc-comment-on-linux_cred-encoding-treat-all-as-unsigned.patch Normal file
View File

@ -0,0 +1,90 @@
From: "J. Bruce Fields" <bfields@redhat.com>
commit 6a36978e6931e6601be586eb313375335f2cfaa3 upstream.
The encoding of linux creds is a bit confusing.
Also: I think in practice it doesn't really matter whether we treat any
of these things as signed or unsigned, but unsigned seems more
straightforward: uid_t/gid_t are unsigned and it simplifies the ngroups
overflow check.
Tested-by: Simo Sorce <simo@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
---
net/sunrpc/auth_gss/gss_rpc_xdr.c | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)
diff --git a/net/sunrpc/auth_gss/gss_rpc_xdr.c b/net/sunrpc/auth_gss/gss_rpc_xdr.c
index f5067b2..3c19c7d 100644
--- a/net/sunrpc/auth_gss/gss_rpc_xdr.c
+++ b/net/sunrpc/auth_gss/gss_rpc_xdr.c
@@ -166,14 +166,15 @@ static int dummy_dec_opt_array(struct xdr_stream *xdr,
return 0;
}
-static int get_s32(struct xdr_stream *xdr, s32 *res)
+static int get_host_u32(struct xdr_stream *xdr, u32 *res)
{
__be32 *p;
p = xdr_inline_decode(xdr, 4);
if (!p)
return -EINVAL;
- memcpy(res, p, sizeof(s32));
+ /* Contents of linux creds are all host-endian: */
+ memcpy(res, p, sizeof(u32));
return 0;
}
@@ -182,8 +183,9 @@ static int gssx_dec_linux_creds(struct xdr_stream *xdr,
{
u32 length;
__be32 *p;
- s32 tmp;
- int N, i, err;
+ u32 tmp;
+ u32 N;
+ int i, err;
p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
@@ -195,19 +197,19 @@ static int gssx_dec_linux_creds(struct xdr_stream *xdr,
return -ENOSPC;
/* uid */
- err = get_s32(xdr, &tmp);
+ err = get_host_u32(xdr, &tmp);
if (err)
return err;
creds->cr_uid = make_kuid(&init_user_ns, tmp);
/* gid */
- err = get_s32(xdr, &tmp);
+ err = get_host_u32(xdr, &tmp);
if (err)
return err;
creds->cr_gid = make_kgid(&init_user_ns, tmp);
/* number of additional gid's */
- err = get_s32(xdr, &tmp);
+ err = get_host_u32(xdr, &tmp);
if (err)
return err;
N = tmp;
@@ -220,7 +222,7 @@ static int gssx_dec_linux_creds(struct xdr_stream *xdr,
/* gid's */
for (i = 0; i < N; i++) {
kgid_t kgid;
- err = get_s32(xdr, &tmp);
+ err = get_host_u32(xdr, &tmp);
if (err)
goto out_free_groups;
err = -EINVAL;
--
1.7.9.5
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113
rpc-fix-huge-kmallocs-in-gss-proxy.patch Normal file
View File

@ -0,0 +1,113 @@
From: "J. Bruce Fields" <bfields@redhat.com>
commit 9dfd87da1aeb0fd364167ad199f40fe96a6a87be upstream.
The reply to a gssproxy can include up to NGROUPS_MAX gid's, which will
take up more than a page. We therefore need to allocate an array of
pages to hold the reply instead of trying to allocate a single huge
buffer.
Tested-by: Simo Sorce <simo@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
---
net/sunrpc/auth_gss/gss_rpc_upcall.c | 30 ++++++++++++++++++++++++++++++
net/sunrpc/auth_gss/gss_rpc_xdr.c | 3 +++
net/sunrpc/auth_gss/gss_rpc_xdr.h | 5 ++++-
3 files changed, 37 insertions(+), 1 deletion(-)
diff --git a/net/sunrpc/auth_gss/gss_rpc_upcall.c b/net/sunrpc/auth_gss/gss_rpc_upcall.c
index af7ffd4..be95af3 100644
--- a/net/sunrpc/auth_gss/gss_rpc_upcall.c
+++ b/net/sunrpc/auth_gss/gss_rpc_upcall.c
@@ -213,6 +213,30 @@ static int gssp_call(struct net *net, struct rpc_message *msg)
return status;
}
+static void gssp_free_receive_pages(struct gssx_arg_accept_sec_context *arg)
+{
+ int i;
+
+ for (i = 0; i < arg->npages && arg->pages[i]; i++)
+ __free_page(arg->pages[i]);
+}
+
+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;
+ }
+ }
+ return 0;
+}
/*
* Public functions
@@ -261,10 +285,16 @@ int gssp_accept_sec_context_upcall(struct net *net,
arg.context_handle = &ctxh;
res.output_token->len = GSSX_max_output_token_sz;
+ ret = gssp_alloc_receive_pages(&arg);
+ if (ret)
+ return ret;
+
/* use nfs/ for targ_name ? */
ret = gssp_call(net, &msg);
+ gssp_free_receive_pages(&arg);
+
/* we need to fetch all data even in case of error so
* that we can free special strctures is they have been allocated */
data->major_status = res.status.major_status;
diff --git a/net/sunrpc/auth_gss/gss_rpc_xdr.c b/net/sunrpc/auth_gss/gss_rpc_xdr.c
index 3c19c7d..f0f78c5 100644
--- a/net/sunrpc/auth_gss/gss_rpc_xdr.c
+++ b/net/sunrpc/auth_gss/gss_rpc_xdr.c
@@ -780,6 +780,9 @@ void gssx_enc_accept_sec_context(struct rpc_rqst *req,
/* arg->options */
err = dummy_enc_opt_array(xdr, &arg->options);
+ xdr_inline_pages(&req->rq_rcv_buf,
+ PAGE_SIZE/2 /* pretty arbitrary */,
+ arg->pages, 0 /* page base */, arg->npages * PAGE_SIZE);
done:
if (err)
dprintk("RPC: gssx_enc_accept_sec_context: %d\n", err);
diff --git a/net/sunrpc/auth_gss/gss_rpc_xdr.h b/net/sunrpc/auth_gss/gss_rpc_xdr.h
index 1c98b27..685a688 100644
--- a/net/sunrpc/auth_gss/gss_rpc_xdr.h
+++ b/net/sunrpc/auth_gss/gss_rpc_xdr.h
@@ -147,6 +147,8 @@ struct gssx_arg_accept_sec_context {
struct gssx_cb *input_cb;
u32 ret_deleg_cred;
struct gssx_option_array options;
+ struct page **pages;
+ unsigned int npages;
};
struct gssx_res_accept_sec_context {
@@ -240,7 +242,8 @@ int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
2 * GSSX_max_princ_sz + \
8 + 8 + 4 + 4 + 4)
#define GSSX_max_output_token_sz 1024
-#define GSSX_max_creds_sz (4 + 4 + 4 + NGROUPS_MAX * 4)
+/* grouplist not included; we allocate separate pages for that: */
+#define GSSX_max_creds_sz (4 + 4 + 4 /* + NGROUPS_MAX*4 */)
#define GSSX_RES_accept_sec_context_sz (GSSX_default_status_sz + \
GSSX_default_ctx_sz + \
GSSX_max_output_token_sz + \
--
1.7.9.5
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52
rpc-let-xdr-layer-allocate-gssproxy-receieve-pages.patch Normal file
View File

@ -0,0 +1,52 @@
From: "J. Bruce Fields" <bfields@redhat.com>
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 <simo@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
---
net/sunrpc/auth_gss/gss_rpc_upcall.c | 16 ++++++----------
1 file changed, 6 insertions(+), 10 deletions(-)
diff --git a/net/sunrpc/auth_gss/gss_rpc_upcall.c b/net/sunrpc/auth_gss/gss_rpc_upcall.c
index be95af3..f1eb0d1 100644
--- 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(struct gssx_arg_accept_sec_context *arg)
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;
}
--
1.7.9.5
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