From: Todd Kjos Date: Wed, 24 Apr 2019 19:31:18 +0000 (-0700) Subject: binder: check for overflow when alloc for security context X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=0b0509508beff65c1d50541861bc0d4973487dc5;p=openwrt%2Fstaging%2Fblogic.git binder: check for overflow when alloc for security context When allocating space in the target buffer for the security context, make sure the extra_buffers_size doesn't overflow. This can only happen if the given size is invalid, but an overflow can turn it into a valid size. Fail the transaction if an overflow is detected. Signed-off-by: Todd Kjos Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/android/binder.c b/drivers/android/binder.c index 4b9c7ca492e6..6f0712f0767c 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -3121,6 +3121,7 @@ static void binder_transaction(struct binder_proc *proc, if (target_node && target_node->txn_security_ctx) { u32 secid; + size_t added_size; security_task_getsecid(proc->tsk, &secid); ret = security_secid_to_secctx(secid, &secctx, &secctx_sz); @@ -3130,7 +3131,15 @@ static void binder_transaction(struct binder_proc *proc, return_error_line = __LINE__; goto err_get_secctx_failed; } - extra_buffers_size += ALIGN(secctx_sz, sizeof(u64)); + added_size = ALIGN(secctx_sz, sizeof(u64)); + extra_buffers_size += added_size; + if (extra_buffers_size < added_size) { + /* integer overflow of extra_buffers_size */ + return_error = BR_FAILED_REPLY; + return_error_param = EINVAL; + return_error_line = __LINE__; + goto err_bad_extra_size; + } } trace_binder_transaction(reply, t, target_node); @@ -3480,6 +3489,7 @@ err_copy_data_failed: t->buffer->transaction = NULL; binder_alloc_free_buf(&target_proc->alloc, t->buffer); err_binder_alloc_buf_failed: +err_bad_extra_size: if (secctx) security_release_secctx(secctx, secctx_sz); err_get_secctx_failed: