From bb4a2e48d5100ed3ff614df158a636bca3c6bf9f Mon Sep 17 00:00:00 2001 From: Todd Kjos Date: Fri, 28 Jun 2019 09:50:12 -0700 Subject: binder: return errors from buffer copy functions The buffer copy functions assumed the caller would ensure correct alignment and that the memory to be copied was completely within the binder buffer. There have been a few cases discovered by syzkallar where a malformed transaction created by a user could violated the assumptions and resulted in a BUG_ON. The fix is to remove the BUG_ON and always return the error to be handled appropriately by the caller. Acked-by: Martijn Coenen Reported-by: syzbot+3ae18325f96190606754@syzkaller.appspotmail.com Fixes: bde4a19fc04f ("binder: use userspace pointer as base of buffer space") Suggested-by: Dan Carpenter Signed-off-by: Todd Kjos Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/android/binder.c | 153 ++++++++++++++++++++++++++++------------------- 1 file changed, 92 insertions(+), 61 deletions(-) (limited to 'drivers/android/binder.c') diff --git a/drivers/android/binder.c b/drivers/android/binder.c index 8bf039fdeb91..38a59a630cd4 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -2059,10 +2059,9 @@ static size_t binder_get_object(struct binder_proc *proc, read_size = min_t(size_t, sizeof(*object), buffer->data_size - offset); if (offset > buffer->data_size || read_size < sizeof(*hdr) || - !IS_ALIGNED(offset, sizeof(u32))) + binder_alloc_copy_from_buffer(&proc->alloc, object, buffer, + offset, read_size)) return 0; - binder_alloc_copy_from_buffer(&proc->alloc, object, buffer, - offset, read_size); /* Ok, now see if we read a complete object. */ hdr = &object->hdr; @@ -2131,8 +2130,10 @@ static struct binder_buffer_object *binder_validate_ptr( return NULL; buffer_offset = start_offset + sizeof(binder_size_t) * index; - binder_alloc_copy_from_buffer(&proc->alloc, &object_offset, - b, buffer_offset, sizeof(object_offset)); + if (binder_alloc_copy_from_buffer(&proc->alloc, &object_offset, + b, buffer_offset, + sizeof(object_offset))) + return NULL; object_size = binder_get_object(proc, b, object_offset, object); if (!object_size || object->hdr.type != BINDER_TYPE_PTR) return NULL; @@ -2212,10 +2213,12 @@ static bool binder_validate_fixup(struct binder_proc *proc, return false; last_min_offset = last_bbo->parent_offset + sizeof(uintptr_t); buffer_offset = objects_start_offset + - sizeof(binder_size_t) * last_bbo->parent, - binder_alloc_copy_from_buffer(&proc->alloc, &last_obj_offset, - b, buffer_offset, - sizeof(last_obj_offset)); + sizeof(binder_size_t) * last_bbo->parent; + if (binder_alloc_copy_from_buffer(&proc->alloc, + &last_obj_offset, + b, buffer_offset, + sizeof(last_obj_offset))) + return false; } return (fixup_offset >= last_min_offset); } @@ -2301,15 +2304,15 @@ static void binder_transaction_buffer_release(struct binder_proc *proc, for (buffer_offset = off_start_offset; buffer_offset < off_end_offset; buffer_offset += sizeof(binder_size_t)) { struct binder_object_header *hdr; - size_t object_size; + size_t object_size = 0; struct binder_object object; binder_size_t object_offset; - binder_alloc_copy_from_buffer(&proc->alloc, &object_offset, - buffer, buffer_offset, - sizeof(object_offset)); - object_size = binder_get_object(proc, buffer, - object_offset, &object); + if (!binder_alloc_copy_from_buffer(&proc->alloc, &object_offset, + buffer, buffer_offset, + sizeof(object_offset))) + object_size = binder_get_object(proc, buffer, + object_offset, &object); if (object_size == 0) { pr_err("transaction release %d bad object at offset %lld, size %zd\n", debug_id, (u64)object_offset, buffer->data_size); @@ -2432,15 +2435,16 @@ static void binder_transaction_buffer_release(struct binder_proc *proc, for (fd_index = 0; fd_index < fda->num_fds; fd_index++) { u32 fd; + int err; binder_size_t offset = fda_offset + fd_index * sizeof(fd); - binder_alloc_copy_from_buffer(&proc->alloc, - &fd, - buffer, - offset, - sizeof(fd)); - binder_deferred_fd_close(fd); + err = binder_alloc_copy_from_buffer( + &proc->alloc, &fd, buffer, + offset, sizeof(fd)); + WARN_ON(err); + if (!err) + binder_deferred_fd_close(fd); } } break; default: @@ -2683,11 +2687,12 @@ static int binder_translate_fd_array(struct binder_fd_array_object *fda, int ret; binder_size_t offset = fda_offset + fdi * sizeof(fd); - binder_alloc_copy_from_buffer(&target_proc->alloc, - &fd, t->buffer, - offset, sizeof(fd)); - ret = binder_translate_fd(fd, offset, t, thread, - in_reply_to); + ret = binder_alloc_copy_from_buffer(&target_proc->alloc, + &fd, t->buffer, + offset, sizeof(fd)); + if (!ret) + ret = binder_translate_fd(fd, offset, t, thread, + in_reply_to); if (ret < 0) return ret; } @@ -2740,8 +2745,12 @@ static int binder_fixup_parent(struct binder_transaction *t, } buffer_offset = bp->parent_offset + (uintptr_t)parent->buffer - (uintptr_t)b->user_data; - binder_alloc_copy_to_buffer(&target_proc->alloc, b, buffer_offset, - &bp->buffer, sizeof(bp->buffer)); + if (binder_alloc_copy_to_buffer(&target_proc->alloc, b, buffer_offset, + &bp->buffer, sizeof(bp->buffer))) { + binder_user_error("%d:%d got transaction with invalid parent offset\n", + proc->pid, thread->pid); + return -EINVAL; + } return 0; } @@ -3160,15 +3169,20 @@ static void binder_transaction(struct binder_proc *proc, goto err_binder_alloc_buf_failed; } if (secctx) { + int err; size_t buf_offset = ALIGN(tr->data_size, sizeof(void *)) + ALIGN(tr->offsets_size, sizeof(void *)) + ALIGN(extra_buffers_size, sizeof(void *)) - ALIGN(secctx_sz, sizeof(u64)); t->security_ctx = (uintptr_t)t->buffer->user_data + buf_offset; - binder_alloc_copy_to_buffer(&target_proc->alloc, - t->buffer, buf_offset, - secctx, secctx_sz); + err = binder_alloc_copy_to_buffer(&target_proc->alloc, + t->buffer, buf_offset, + secctx, secctx_sz); + if (err) { + t->security_ctx = 0; + WARN_ON(1); + } security_release_secctx(secctx, secctx_sz); secctx = NULL; } @@ -3234,11 +3248,16 @@ static void binder_transaction(struct binder_proc *proc, struct binder_object object; binder_size_t object_offset; - binder_alloc_copy_from_buffer(&target_proc->alloc, - &object_offset, - t->buffer, - buffer_offset, - sizeof(object_offset)); + if (binder_alloc_copy_from_buffer(&target_proc->alloc, + &object_offset, + t->buffer, + buffer_offset, + sizeof(object_offset))) { + return_error = BR_FAILED_REPLY; + return_error_param = -EINVAL; + return_error_line = __LINE__; + goto err_bad_offset; + } object_size = binder_get_object(target_proc, t->buffer, object_offset, &object); if (object_size == 0 || object_offset < off_min) { @@ -3262,15 +3281,17 @@ static void binder_transaction(struct binder_proc *proc, fp = to_flat_binder_object(hdr); ret = binder_translate_binder(fp, t, thread); - if (ret < 0) { + + if (ret < 0 || + binder_alloc_copy_to_buffer(&target_proc->alloc, + t->buffer, + object_offset, + fp, sizeof(*fp))) { return_error = BR_FAILED_REPLY; return_error_param = ret; return_error_line = __LINE__; goto err_translate_failed; } - binder_alloc_copy_to_buffer(&target_proc->alloc, - t->buffer, object_offset, - fp, sizeof(*fp)); } break; case BINDER_TYPE_HANDLE: case BINDER_TYPE_WEAK_HANDLE: { @@ -3278,15 +3299,16 @@ static void binder_transaction(struct binder_proc *proc, fp = to_flat_binder_object(hdr); ret = binder_translate_handle(fp, t, thread); - if (ret < 0) { + if (ret < 0 || + binder_alloc_copy_to_buffer(&target_proc->alloc, + t->buffer, + object_offset, + fp, sizeof(*fp))) { return_error = BR_FAILED_REPLY; return_error_param = ret; return_error_line = __LINE__; goto err_translate_failed; } - binder_alloc_copy_to_buffer(&target_proc->alloc, - t->buffer, object_offset, - fp, sizeof(*fp)); } break; case BINDER_TYPE_FD: { @@ -3296,16 +3318,17 @@ static void binder_transaction(struct binder_proc *proc, int ret = binder_translate_fd(fp->fd, fd_offset, t, thread, in_reply_to); - if (ret < 0) { + fp->pad_binder = 0; + if (ret < 0 || + binder_alloc_copy_to_buffer(&target_proc->alloc, + t->buffer, + object_offset, + fp, sizeof(*fp))) { return_error = BR_FAILED_REPLY; return_error_param = ret; return_error_line = __LINE__; goto err_translate_failed; } - fp->pad_binder = 0; - binder_alloc_copy_to_buffer(&target_proc->alloc, - t->buffer, object_offset, - fp, sizeof(*fp)); } break; case BINDER_TYPE_FDA: { struct binder_object ptr_object; @@ -3393,15 +3416,16 @@ static void binder_transaction(struct binder_proc *proc, num_valid, last_fixup_obj_off, last_fixup_min_off); - if (ret < 0) { + if (ret < 0 || + binder_alloc_copy_to_buffer(&target_proc->alloc, + t->buffer, + object_offset, + bp, sizeof(*bp))) { return_error = BR_FAILED_REPLY; return_error_param = ret; return_error_line = __LINE__; goto err_translate_failed; } - binder_alloc_copy_to_buffer(&target_proc->alloc, - t->buffer, object_offset, - bp, sizeof(*bp)); last_fixup_obj_off = object_offset; last_fixup_min_off = 0; } break; @@ -4140,20 +4164,27 @@ static int binder_apply_fd_fixups(struct binder_proc *proc, trace_binder_transaction_fd_recv(t, fd, fixup->offset); fd_install(fd, fixup->file); fixup->file = NULL; - binder_alloc_copy_to_buffer(&proc->alloc, t->buffer, - fixup->offset, &fd, - sizeof(u32)); + if (binder_alloc_copy_to_buffer(&proc->alloc, t->buffer, + fixup->offset, &fd, + sizeof(u32))) { + ret = -EINVAL; + break; + } } list_for_each_entry_safe(fixup, tmp, &t->fd_fixups, fixup_entry) { if (fixup->file) { fput(fixup->file); } else if (ret) { u32 fd; - - binder_alloc_copy_from_buffer(&proc->alloc, &fd, - t->buffer, fixup->offset, - sizeof(fd)); - binder_deferred_fd_close(fd); + int err; + + err = binder_alloc_copy_from_buffer(&proc->alloc, &fd, + t->buffer, + fixup->offset, + sizeof(fd)); + WARN_ON(err); + if (!err) + binder_deferred_fd_close(fd); } list_del(&fixup->fixup_entry); kfree(fixup); -- cgit v1.2.3