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rpc: fix huge kmalloc's in gss-proxy
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>
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6a36978e69
commit
9dfd87da1a
3 changed files with 37 additions and 1 deletions
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@ -213,6 +213,30 @@ static int gssp_call(struct net *net, struct rpc_message *msg)
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return status;
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}
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static void gssp_free_receive_pages(struct gssx_arg_accept_sec_context *arg)
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{
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int i;
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for (i = 0; i < arg->npages && arg->pages[i]; i++)
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__free_page(arg->pages[i]);
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}
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static int gssp_alloc_receive_pages(struct gssx_arg_accept_sec_context *arg)
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{
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int i;
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arg->npages = DIV_ROUND_UP(NGROUPS_MAX * 4, PAGE_SIZE);
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arg->pages = kzalloc(arg->npages * sizeof(struct page *), GFP_KERNEL);
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for (i=0; i < arg->npages; i++) {
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arg->pages[i] = alloc_page(GFP_KERNEL);
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if (arg->pages[i] == NULL) {
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gssp_free_receive_pages(arg);
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return -ENOMEM;
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}
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}
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return 0;
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}
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/*
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* Public functions
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@ -261,10 +285,16 @@ int gssp_accept_sec_context_upcall(struct net *net,
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arg.context_handle = &ctxh;
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res.output_token->len = GSSX_max_output_token_sz;
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ret = gssp_alloc_receive_pages(&arg);
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if (ret)
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return ret;
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/* use nfs/ for targ_name ? */
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ret = gssp_call(net, &msg);
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gssp_free_receive_pages(&arg);
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/* we need to fetch all data even in case of error so
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* that we can free special strctures is they have been allocated */
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data->major_status = res.status.major_status;
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@ -780,6 +780,9 @@ void gssx_enc_accept_sec_context(struct rpc_rqst *req,
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/* arg->options */
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err = dummy_enc_opt_array(xdr, &arg->options);
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xdr_inline_pages(&req->rq_rcv_buf,
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PAGE_SIZE/2 /* pretty arbitrary */,
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arg->pages, 0 /* page base */, arg->npages * PAGE_SIZE);
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done:
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if (err)
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dprintk("RPC: gssx_enc_accept_sec_context: %d\n", err);
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@ -147,6 +147,8 @@ struct gssx_arg_accept_sec_context {
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struct gssx_cb *input_cb;
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u32 ret_deleg_cred;
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struct gssx_option_array options;
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struct page **pages;
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unsigned int npages;
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};
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struct gssx_res_accept_sec_context {
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@ -240,7 +242,8 @@ int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
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2 * GSSX_max_princ_sz + \
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8 + 8 + 4 + 4 + 4)
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#define GSSX_max_output_token_sz 1024
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#define GSSX_max_creds_sz (4 + 4 + 4 + NGROUPS_MAX * 4)
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/* grouplist not included; we allocate separate pages for that: */
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#define GSSX_max_creds_sz (4 + 4 + 4 /* + NGROUPS_MAX*4 */)
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#define GSSX_RES_accept_sec_context_sz (GSSX_default_status_sz + \
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GSSX_default_ctx_sz + \
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GSSX_max_output_token_sz + \
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