提交 ea5c4cc6 编写于 作者: A Arve Hjønnevåg 提交者: Greg Kroah-Hartman

Staging: binder: Add more offset validation.

Check that datasize is not smaller than one flat_binder_object.
Check that offsets are aligned.
Check that offsets_size is aligned.
Signed-off-by: NArve Hjønnevåg <arve@android.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
上级 4ddfc911
......@@ -1430,10 +1430,19 @@ binder_transaction(struct binder_proc *proc, struct binder_thread *thread,
return_error = BR_FAILED_REPLY;
goto err_copy_data_failed;
}
if (!IS_ALIGNED(tr->offsets_size, sizeof(size_t))) {
binder_user_error("binder: %d:%d got transaction with "
"invalid offsets size, %zd\n",
proc->pid, thread->pid, tr->offsets_size);
return_error = BR_FAILED_REPLY;
goto err_bad_offset;
}
off_end = (void *)offp + tr->offsets_size;
for (; offp < off_end; offp++) {
struct flat_binder_object *fp;
if (*offp > t->buffer->data_size - sizeof(*fp)) {
if (*offp > t->buffer->data_size - sizeof(*fp) ||
t->buffer->data_size < sizeof(*fp) ||
!IS_ALIGNED(*offp, sizeof(void *))) {
binder_user_error("binder: %d:%d got transaction with "
"invalid offset, %zd\n",
proc->pid, thread->pid, *offp);
......@@ -1651,7 +1660,9 @@ binder_transaction_buffer_release(struct binder_proc *proc, struct binder_buffer
off_end = (void *)offp + buffer->offsets_size;
for (; offp < off_end; offp++) {
struct flat_binder_object *fp;
if (*offp > buffer->data_size - sizeof(*fp)) {
if (*offp > buffer->data_size - sizeof(*fp) ||
buffer->data_size < sizeof(*fp) ||
!IS_ALIGNED(*offp, sizeof(void *))) {
printk(KERN_ERR "binder: transaction release %d bad"
"offset %zd, size %zd\n", debug_id, *offp, buffer->data_size);
continue;
......
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