From patchwork Wed Nov 2 16:19:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nathan Chancellor X-Patchwork-Id: 622008 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0BC51C43217 for ; Wed, 2 Nov 2022 16:24:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231376AbiKBQYf (ORCPT ); Wed, 2 Nov 2022 12:24:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44604 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231754AbiKBQYJ (ORCPT ); Wed, 2 Nov 2022 12:24:09 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 65238FD6; Wed, 2 Nov 2022 09:19:18 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id AA2A7B8236B; Wed, 2 Nov 2022 16:19:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 94C2BC433D6; Wed, 2 Nov 2022 16:19:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1667405955; bh=fzJ4CnsGQWbTXfboP1sPJL+W4uTxIl+/qSJ9/kCCSe0=; h=From:To:Cc:Subject:Date:From; b=aDP0qW4zK1VPnYvuwnPkhvje0RhOPlsbsorxPBBAYSqcHAtE2fKCrfx3/P8IKjC4c WpMQLDhKwXirS0C4xaTtKwcnHJOYcNt0iv9kODbB7ERWC6hH9lwSXg7/dfMZiKqa5o 8WKYgFbvKozUfEKWYH7qJBFkBCK38KJW+UaYV/DnataywfWNlJZ9a+8HGjM57H1agJ hgPw1sR1WwrJoCEKkRSp2ZIvh6mCQB+iIDXbRaVHIihg2Bz8PnpytnQqt1EaCCRFXV 4ogoixf+jS6G6z9/X7eZ0VHXiC6NZHaGhXJImCqpQFKvbIdW6it0QPx4ZuWql1xaaV U5CStX3Vbm9fQ== From: Nathan Chancellor To: James Smart , Ram Vegesna , "James E.J. Bottomley" , "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, Nick Desaulniers , Tom Rix , Kees Cook , Sami Tolvanen , llvm@lists.linux.dev, linux-kernel@vger.kernel.org, patches@lists.linux.dev, Nathan Chancellor Subject: [PATCH] scsi: elx: libefc: Fix second parameter type in state callbacks Date: Wed, 2 Nov 2022 09:19:06 -0700 Message-Id: <20221102161906.2781508-1-nathan@kernel.org> X-Mailer: git-send-email 2.38.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG), indirect call targets are validated against the expected function pointer prototype to make sure the call target is valid to help mitigate ROP attacks. If they are not identical, there is a failure at run time, which manifests as either a kernel panic or thread getting killed. A proposed warning in clang aims to catch these at compile time, which reveals: drivers/scsi/elx/libefc/efc_node.c:811:22: error: incompatible function pointer types assigning to 'void (*)(struct efc_sm_ctx *, u32, void *)' (aka 'void (*)(struct efc_sm_ctx *, unsigned int, void *)') from 'void (*)(struct efc_sm_ctx *, enum efc_sm_event, void *)' [-Werror,-Wincompatible-function-pointer-types-strict] ctx->current_state = state; ^ ~~~~~ drivers/scsi/elx/libefc/efc_node.c:878:21: error: incompatible function pointer types assigning to 'void (*)(struct efc_sm_ctx *, u32, void *)' (aka 'void (*)(struct efc_sm_ctx *, unsigned int, void *)') from 'void (*)(struct efc_sm_ctx *, enum efc_sm_event, void *)' [-Werror,-Wincompatible-function-pointer-types-strict] node->nodedb_state = state; ^ ~~~~~ drivers/scsi/elx/libefc/efc_node.c:905:6: error: incompatible function pointer types assigning to 'void (*)(struct efc_sm_ctx *, enum efc_sm_event, void *)' from 'void (*)(struct efc_sm_ctx *, u32, void *)' (aka 'void (*)(struct efc_sm_ctx *, unsigned int, void *)') [-Werror,-Wincompatible-function-pointer-types-strict] pf = node->nodedb_state; ^ ~~~~~~~~~~~~~~~~~~ drivers/scsi/elx/libefc/efc_device.c:455:22: error: incompatible function pointer types assigning to 'void (*)(struct efc_sm_ctx *, u32, void *)' (aka 'void (*)(struct efc_sm_ctx *, unsigned int, void *)') from 'void (struct efc_sm_ctx *, enum efc_sm_event, void *)' [-Werror,-Wincompatible-function-pointer-types-strict] node->nodedb_state = __efc_d_init; ^ ~~~~~~~~~~~~ drivers/scsi/elx/libefc/efc_sm.c:41:22: error: incompatible function pointer types assigning to 'void (*)(struct efc_sm_ctx *, u32, void *)' (aka 'void (*)(struct efc_sm_ctx *, unsigned int, void *)') from 'void (*)(struct efc_sm_ctx *, enum efc_sm_event, void *)' [-Werror,-Wincompatible-function-pointer-types-strict] ctx->current_state = state; ^ ~~~~~ The type of the second parameter in the prototypes of ->current_state() and ->nodedb_state() ('u32') does not match the implementations, which have a second parameter type of 'enum efc_sm_event'. Update the prototypes to have the correct second parameter type, clearing up all the warnings and CFI failures. Link: https://github.com/ClangBuiltLinux/linux/issues/1750 Reported-by: Sami Tolvanen Signed-off-by: Nathan Chancellor --- drivers/scsi/elx/libefc/efclib.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) base-commit: 9abf2313adc1ca1b6180c508c25f22f9395cc780 diff --git a/drivers/scsi/elx/libefc/efclib.h b/drivers/scsi/elx/libefc/efclib.h index dde20891c2dd..57e338612812 100644 --- a/drivers/scsi/elx/libefc/efclib.h +++ b/drivers/scsi/elx/libefc/efclib.h @@ -58,10 +58,12 @@ enum efc_node_send_ls_acc { #define EFC_LINK_STATUS_UP 0 #define EFC_LINK_STATUS_DOWN 1 +enum efc_sm_event; + /* State machine context header */ struct efc_sm_ctx { void (*current_state)(struct efc_sm_ctx *ctx, - u32 evt, void *arg); + enum efc_sm_event evt, void *arg); const char *description; void *app; @@ -365,7 +367,7 @@ struct efc_node { int prev_evt; void (*nodedb_state)(struct efc_sm_ctx *ctx, - u32 evt, void *arg); + enum efc_sm_event evt, void *arg); struct timer_list gidpt_delay_timer; u64 time_last_gidpt_msec;