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Define a constant to limit data from guest.

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This limit will prevent guest trying to do nasty things and DoS to host.

Signed-off-by: Frediano Ziglio <fziglio@redhat.com>
This commit is contained in:
Frediano Ziglio 2015-09-08 11:58:11 +01:00
parent 097c638b12
commit 0205a6ce63
1 changed files with 11 additions and 0 deletions
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11
server/red_parse_qxl.c
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@ -21,11 +21,22 @@
#include <stdbool.h>
#include <inttypes.h>
#include <glib.h>
#include "common/lz_common.h"
#include "red_common.h"
#include "red_memslots.h"
#include "red_parse_qxl.h"
/* Max size in bytes for any data field used in a QXL command.
* This will for example be useful to prevent the guest from saturating the
* host memory if it tries to send overlapping chunks.
* This value should be big enough for all requests but limited
* to 32 bits. Even better if it fits on 31 bits to detect integer overflows.
*/
#define MAX_DATA_CHUNK 0x7ffffffflu
G_STATIC_ASSERT(MAX_DATA_CHUNK <= G_MAXINT32);
#if 0
static void hexdump_qxl(RedMemSlotInfo *slots, int group_id,
QXLPHYSICAL addr, uint8_t bytes)