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authorArve Hjønnevåg <arve@android.com>2009-04-06 15:12:56 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2009-04-17 11:06:26 -0700
commitea5c4cc68e2b5f4ec41d666376d3606d4d5c3426 (patch)
tree3d6a9b0ceca8d1f0583bda79bfc05d09f887b073 /drivers/staging
parent4ddfc911e39a01f95ad9765d3b9e6f43e14eeff4 (diff)
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: Arve Hjønnevåg <arve@android.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging')
-rw-r--r--drivers/staging/android/binder.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/staging/android/binder.c b/drivers/staging/android/binder.c
index 761f5d6a9cf..64f95ee8a70 100644
--- a/drivers/staging/android/binder.c
+++ b/drivers/staging/android/binder.c
@@ -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;