net-lwip: wget: add LMB and buffer checks
Legacy NET wget invokes a store_block() function which performs buffer validation (LMB, address wrapping). Do the same with NET_LWIP. Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org> Suggested-by: Sughosh Ganu <sughosh.ganu@linaro.org> Acked-by: Sughosh Ganu <sughosh.ganu@linaro.org> Tested-by: Sughosh Ganu <sughosh.ganu@linaro.org>
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@@ -6,6 +6,7 @@
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#include <display_options.h>
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#include <efi_loader.h>
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#include <image.h>
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#include <linux/kconfig.h>
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#include <lwip/apps/http_client.h>
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#include "lwip/altcp_tls.h"
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#include <lwip/errno.h>
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@@ -202,11 +203,58 @@ static int parse_legacy_arg(char *arg, char *nurl, size_t rem)
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return 0;
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}
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/**
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* store_block() - copy received data
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*
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* This function is called by the receive callback to copy a block of data
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* into its final location (ctx->daddr). Before doing so, it checks if the copy
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* is allowed.
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*
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* @ctx: the context for the current transfer
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* @src: the data received from the TCP stack
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* @len: the length of the data
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*/
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static int store_block(struct wget_ctx *ctx, void *src, u16_t len)
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{
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ulong store_addr = ctx->daddr;
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uchar *ptr;
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/* Avoid overflow */
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if (wget_info->buffer_size && wget_info->buffer_size < ctx->size + len)
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return -1;
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if (CONFIG_IS_ENABLED(LMB) && wget_info->set_bootdev) {
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if (store_addr + len < store_addr ||
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lmb_read_check(store_addr, len)) {
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if (!wget_info->silent) {
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printf("\nwget error: ");
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printf("trying to overwrite reserved memory\n");
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}
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return -1;
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}
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}
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ptr = map_sysmem(store_addr, len);
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memcpy(ptr, src, len);
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unmap_sysmem(ptr);
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ctx->daddr += len;
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ctx->size += len;
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if (ctx->size - ctx->prevsize > PROGRESS_PRINT_STEP_BYTES) {
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if (!wget_info->silent)
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printf("#");
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ctx->prevsize = ctx->size;
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}
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return 0;
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}
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static err_t httpc_recv_cb(void *arg, struct altcp_pcb *pcb, struct pbuf *pbuf,
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err_t err)
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{
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struct wget_ctx *ctx = arg;
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struct pbuf *buf;
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err_t ret;
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if (!pbuf)
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return ERR_BUF;
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@@ -215,19 +263,17 @@ static err_t httpc_recv_cb(void *arg, struct altcp_pcb *pcb, struct pbuf *pbuf,
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ctx->start_time = get_timer(0);
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for (buf = pbuf; buf; buf = buf->next) {
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memcpy((void *)ctx->daddr, buf->payload, buf->len);
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ctx->daddr += buf->len;
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ctx->size += buf->len;
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if (!wget_info->silent &&
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ctx->size - ctx->prevsize > PROGRESS_PRINT_STEP_BYTES) {
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printf("#");
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ctx->prevsize = ctx->size;
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if (store_block(ctx, buf->payload, buf->len) < 0) {
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altcp_abort(pcb);
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ret = ERR_BUF;
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goto out;
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}
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}
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altcp_recved(pcb, pbuf->tot_len);
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ret = ERR_OK;
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out:
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pbuf_free(pbuf);
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return ERR_OK;
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return ret;
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}
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static void httpc_result_cb(void *arg, httpc_result_t httpc_result,
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