From: Todd Kjos tkjos@google.com
commit 6d98eb95b450a75adb4516a1d33652dc78d2b20c upstream.
Transactions are copied from the sender to the target first and objects like BINDER_TYPE_PTR and BINDER_TYPE_FDA are then fixed up. This means there is a short period where the sender's version of these objects are visible to the target prior to the fixups.
Instead of copying all of the data first, copy data only after any needed fixups have been applied.
Fixes: 457b9a6f09f0 ("Staging: android: add binder driver") Reviewed-by: Martijn Coenen maco@android.com Acked-by: Christian Brauner christian.brauner@ubuntu.com Signed-off-by: Todd Kjos tkjos@google.com Link: https://lore.kernel.org/r/20211130185152.437403-3-tkjos@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org [cmllamas: fix trivial merge conflict] Signed-off-by: Carlos Llamas cmllamas@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/android/binder.c | 94 +++++++++++++++++++++++++++++++++++------------ 1 file changed, 70 insertions(+), 24 deletions(-)
--- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -2013,15 +2013,21 @@ static void binder_cleanup_transaction(s /** * binder_get_object() - gets object and checks for valid metadata * @proc: binder_proc owning the buffer + * @u: sender's user pointer to base of buffer * @buffer: binder_buffer that we're parsing. * @offset: offset in the @buffer at which to validate an object. * @object: struct binder_object to read into * - * Return: If there's a valid metadata object at @offset in @buffer, the + * Copy the binder object at the given offset into @object. If @u is + * provided then the copy is from the sender's buffer. If not, then + * it is copied from the target's @buffer. + * + * Return: If there's a valid metadata object at @offset, the * size of that object. Otherwise, it returns zero. The object * is read into the struct binder_object pointed to by @object. */ static size_t binder_get_object(struct binder_proc *proc, + const void __user *u, struct binder_buffer *buffer, unsigned long offset, struct binder_object *object) @@ -2031,10 +2037,16 @@ static size_t binder_get_object(struct b size_t object_size = 0;
read_size = min_t(size_t, sizeof(*object), buffer->data_size - offset); - if (offset > buffer->data_size || read_size < sizeof(*hdr) || - binder_alloc_copy_from_buffer(&proc->alloc, object, buffer, - offset, read_size)) + if (offset > buffer->data_size || read_size < sizeof(*hdr)) return 0; + if (u) { + if (copy_from_user(object, u + offset, read_size)) + return 0; + } else { + if (binder_alloc_copy_from_buffer(&proc->alloc, object, buffer, + offset, read_size)) + return 0; + }
/* Ok, now see if we read a complete object. */ hdr = &object->hdr; @@ -2107,7 +2119,7 @@ static struct binder_buffer_object *bind b, buffer_offset, sizeof(object_offset))) return NULL; - object_size = binder_get_object(proc, b, object_offset, object); + object_size = binder_get_object(proc, NULL, b, object_offset, object); if (!object_size || object->hdr.type != BINDER_TYPE_PTR) return NULL; if (object_offsetp) @@ -2172,7 +2184,8 @@ static bool binder_validate_fixup(struct unsigned long buffer_offset; struct binder_object last_object; struct binder_buffer_object *last_bbo; - size_t object_size = binder_get_object(proc, b, last_obj_offset, + size_t object_size = binder_get_object(proc, NULL, b, + last_obj_offset, &last_object); if (object_size != sizeof(*last_bbo)) return false; @@ -2285,7 +2298,7 @@ static void binder_transaction_buffer_re if (!binder_alloc_copy_from_buffer(&proc->alloc, &object_offset, buffer, buffer_offset, sizeof(object_offset))) - object_size = binder_get_object(proc, buffer, + object_size = binder_get_object(proc, NULL, buffer, object_offset, &object); if (object_size == 0) { pr_err("transaction release %d bad object at offset %lld, size %zd\n", @@ -2852,6 +2865,7 @@ static void binder_transaction(struct bi binder_size_t off_start_offset, off_end_offset; binder_size_t off_min; binder_size_t sg_buf_offset, sg_buf_end_offset; + binder_size_t user_offset = 0; struct binder_proc *target_proc = NULL; struct binder_thread *target_thread = NULL; struct binder_node *target_node = NULL; @@ -2866,6 +2880,8 @@ static void binder_transaction(struct bi int t_debug_id = atomic_inc_return(&binder_last_id); char *secctx = NULL; u32 secctx_sz = 0; + const void __user *user_buffer = (const void __user *) + (uintptr_t)tr->data.ptr.buffer;
e = binder_transaction_log_add(&binder_transaction_log); e->debug_id = t_debug_id; @@ -3179,19 +3195,6 @@ static void binder_transaction(struct bi
if (binder_alloc_copy_user_to_buffer( &target_proc->alloc, - t->buffer, 0, - (const void __user *) - (uintptr_t)tr->data.ptr.buffer, - tr->data_size)) { - binder_user_error("%d:%d got transaction with invalid data ptr\n", - proc->pid, thread->pid); - return_error = BR_FAILED_REPLY; - return_error_param = -EFAULT; - return_error_line = __LINE__; - goto err_copy_data_failed; - } - if (binder_alloc_copy_user_to_buffer( - &target_proc->alloc, t->buffer, ALIGN(tr->data_size, sizeof(void *)), (const void __user *) @@ -3234,6 +3237,7 @@ static void binder_transaction(struct bi size_t object_size; struct binder_object object; binder_size_t object_offset; + binder_size_t copy_size;
if (binder_alloc_copy_from_buffer(&target_proc->alloc, &object_offset, @@ -3245,8 +3249,27 @@ static void binder_transaction(struct bi return_error_line = __LINE__; goto err_bad_offset; } - object_size = binder_get_object(target_proc, t->buffer, - object_offset, &object); + + /* + * Copy the source user buffer up to the next object + * that will be processed. + */ + copy_size = object_offset - user_offset; + if (copy_size && (user_offset > object_offset || + binder_alloc_copy_user_to_buffer( + &target_proc->alloc, + t->buffer, user_offset, + user_buffer + user_offset, + copy_size))) { + binder_user_error("%d:%d got transaction with invalid data ptr\n", + proc->pid, thread->pid); + return_error = BR_FAILED_REPLY; + return_error_param = -EFAULT; + return_error_line = __LINE__; + goto err_copy_data_failed; + } + object_size = binder_get_object(target_proc, user_buffer, + t->buffer, object_offset, &object); if (object_size == 0 || object_offset < off_min) { binder_user_error("%d:%d got transaction with invalid offset (%lld, min %lld max %lld) or object.\n", proc->pid, thread->pid, @@ -3258,6 +3281,11 @@ static void binder_transaction(struct bi return_error_line = __LINE__; goto err_bad_offset; } + /* + * Set offset to the next buffer fragment to be + * copied + */ + user_offset = object_offset + object_size;
hdr = &object.hdr; off_min = object_offset + object_size; @@ -3353,9 +3381,14 @@ static void binder_transaction(struct bi } ret = binder_translate_fd_array(fda, parent, t, thread, in_reply_to); - if (ret < 0) { + if (!ret) + ret = binder_alloc_copy_to_buffer(&target_proc->alloc, + t->buffer, + object_offset, + fda, sizeof(*fda)); + if (ret) { return_error = BR_FAILED_REPLY; - return_error_param = ret; + return_error_param = ret > 0 ? -EINVAL : ret; return_error_line = __LINE__; goto err_translate_failed; } @@ -3425,6 +3458,19 @@ static void binder_transaction(struct bi goto err_bad_object_type; } } + /* Done processing objects, copy the rest of the buffer */ + if (binder_alloc_copy_user_to_buffer( + &target_proc->alloc, + t->buffer, user_offset, + user_buffer + user_offset, + tr->data_size - user_offset)) { + binder_user_error("%d:%d got transaction with invalid data ptr\n", + proc->pid, thread->pid); + return_error = BR_FAILED_REPLY; + return_error_param = -EFAULT; + return_error_line = __LINE__; + goto err_copy_data_failed; + } tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE; t->work.type = BINDER_WORK_TRANSACTION;