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Demarshal robustness fixes

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This commit is contained in:
Kristian Høgsberg 2010-08-09 14:34:11 -04:00
parent 6d70202f80
commit 5b0079aed5
3 changed files with 90 additions and 31 deletions
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81
connection.c
View file

@ -29,6 +29,7 @@
#include <ffi.h>
#include <assert.h>
#include <fcntl.h>
#include <unistd.h>
#include "wayland-util.h"
#include "connection.h"
@ -279,7 +280,7 @@ wl_connection_vmarshal(struct wl_connection *connection,
wl_connection_write(connection, args, size);
}
void
int
wl_connection_demarshal(struct wl_connection *connection,
uint32_t size,
struct wl_hash_table *objects,
@ -289,8 +290,8 @@ wl_connection_demarshal(struct wl_connection *connection,
{
ffi_type *types[20];
ffi_cif cif;
uint32_t *p, result, length;
int i, count;
uint32_t *p, *next, *end, result, length;
int i, count, ret = 0;
union {
uint32_t uint32;
char *string;
@ -305,12 +306,12 @@ wl_connection_demarshal(struct wl_connection *connection,
count = strlen(message->signature) + 2;
if (count > ARRAY_LENGTH(types)) {
printf("too many args (%d)\n", count);
return;
assert(0);
}
if (sizeof buffer < size) {
printf("request too big, should malloc tmp buffer here\n");
return;
assert(0);
}
types[0] = &ffi_type_pointer;
@ -323,7 +324,17 @@ wl_connection_demarshal(struct wl_connection *connection,
wl_connection_copy(connection, buffer, size);
p = &buffer[2];
end = (uint32_t *) ((char *) (p + size));
for (i = 2; i < count; i++) {
if (p + 1 > end) {
printf("message too short, "
"object (%d), message %s(%s)\n",
*p, message->name, message->signature);
errno = EINVAL;
ret = -1;
goto out;
}
switch (message->signature[i - 2]) {
case 'u':
case 'i':
@ -333,21 +344,37 @@ wl_connection_demarshal(struct wl_connection *connection,
case 's':
types[i] = &ffi_type_pointer;
length = *p++;
next = p + DIV_ROUNDUP(length, sizeof *p);
if (next > end) {
printf("message too short, "
"object (%d), message %s(%s)\n",
*p, message->name, message->signature);
errno = EINVAL;
ret = -1;
goto out;
}
values[i].string = malloc(length + 1);
if (values[i].string == NULL) {
/* FIXME: Send NO_MEMORY */
return;
errno = ENOMEM;
ret = -1;
goto out;
}
memcpy(values[i].string, p, length);
values[i].string[length] = '\0';
p += DIV_ROUNDUP(length, sizeof *p);
p = next;
break;
case 'o':
types[i] = &ffi_type_pointer;
object = wl_hash_table_lookup(objects, *p);
if (object == NULL && *p != 0)
if (object == NULL && *p != 0) {
printf("unknown object (%d), message %s(%s)\n",
*p, message->name, message->signature);
errno = EINVAL;
ret = -1;
goto out;
}
values[i].object = object;
p++;
break;
@ -355,26 +382,46 @@ wl_connection_demarshal(struct wl_connection *connection,
types[i] = &ffi_type_uint32;
values[i].new_id = *p;
object = wl_hash_table_lookup(objects, *p);
if (object != NULL)
printf("object already exists (%d)\n", *p);
if (object != NULL) {
printf("not a new object (%d), "
"message %s(%s)\n",
*p, message->name, message->signature);
errno = EINVAL;
ret = -1;
goto out;
}
p++;
break;
case 'a':
types[i] = &ffi_type_pointer;
length = *p++;
values[i].array = malloc(length + sizeof *values[i].array);
next = p + DIV_ROUNDUP(length, sizeof *p);
if (next > end) {
printf("message too short, "
"object (%d), message %s(%s)\n",
*p, message->name, message->signature);
errno = EINVAL;
ret = -1;
goto out;
}
values[i].array =
malloc(length + sizeof *values[i].array);
if (values[i].array == NULL) {
/* FIXME: Send NO_MEMORY */
return;
errno = ENOMEM;
ret = -1;
goto out;
}
values[i].array->size = length;
values[i].array->alloc = 0;
values[i].array->data = values[i].array + 1;
memcpy(values[i].array->data, p, length);
p += DIV_ROUNDUP(length, sizeof *p);
p = next;
break;
default:
printf("unknown type\n");
assert(0);
break;
}
args[i] = &values[i];
@ -383,6 +430,8 @@ wl_connection_demarshal(struct wl_connection *connection,
ffi_prep_cif(&cif, FFI_DEFAULT_ABI, count, &ffi_type_uint32, types);
ffi_call(&cif, func, &result, args);
out:
count = i;
for (i = 2; i < count; i++) {
switch (message->signature[i - 2]) {
case 's':
@ -393,4 +442,6 @@ wl_connection_demarshal(struct wl_connection *connection,
break;
}
}
return ret;
}

12
connection.h
View file

@ -48,11 +48,11 @@ void wl_connection_vmarshal(struct wl_connection *connection,
uint32_t opcode, va_list ap,
const struct wl_message *message);
void wl_connection_demarshal(struct wl_connection *connection,
uint32_t size,
struct wl_hash_table *objects,
void (*func)(void),
void *data, struct wl_object *target,
const struct wl_message *message);
int wl_connection_demarshal(struct wl_connection *connection,
uint32_t size,
struct wl_hash_table *objects,
void (*func)(void),
void *data, struct wl_object *target,
const struct wl_message *message);
#endif

24
wayland.c
View file

@ -86,7 +86,7 @@ wl_client_connection_data(int fd, uint32_t mask, void *data)
struct wl_object *object;
uint32_t p[2], opcode, size;
uint32_t cmask = 0;
int len;
int len, ret;
if (mask & WL_EVENT_READABLE)
cmask |= WL_CONNECTION_READABLE;
@ -123,13 +123,21 @@ wl_client_connection_data(int fd, uint32_t mask, void *data)
continue;
}
wl_connection_demarshal(client->connection,
size,
client->display->objects,
object->implementation[opcode],
client,
object,
&object->interface->methods[opcode]);
ret = wl_connection_demarshal(client->connection,
size,
client->display->objects,
object->implementation[opcode],
client,
object,
&object->interface->methods[opcode]);
if (ret < 0 && errno == EINVAL)
wl_client_post_event(client, &client->display->base,
WL_DISPLAY_INVALID_METHOD,
p[0], opcode);
if (ret < 0 && errno == ENOMEM)
wl_client_post_event(client, &client->display->base,
WL_DISPLAY_NO_MEMORY);
wl_connection_consume(connection, size);
len -= size;