From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26C90C10DAA for ; Sat, 12 Sep 2020 11:11:54 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D1F3620855 for ; Sat, 12 Sep 2020 11:11:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="LnabIuHj"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="Fl2bqtSL" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D1F3620855 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=46mb4FFsWDNXTPLkHM4prEH+aylnGu83B8WQ80UGb6s=; b=LnabIuHjBszNHe8FRqS4Qsotx 3rtxqm3tpmrWHJXkJg+3Hj1r7Wu7qXwLqp+YamoJ1ql+sUcA7AYa8vTXuCyzr1+bic82mI/6Eqcz8 c5ZdxJXDqpO9B/IXh80jmxBkhuf92QZ0nEHOeRNWK5X8ebBn1NPyJZUUq4NxPM5ZRaWUoMorCoXc+ ggbxjHdi094EQrjRUD8qtpzKud4hlIxv5ZLmsFT2DGO55L/9/WDp8Z2BWl+g3Mows2dqXyuMTDxgc NQD0ghRj2V6JU8O3WdsQDvgxNeBENYgeaqXl3T8O1wGh4HIkRwqhV+yvHdluR6p1tDQoT5f5hfHbs Mv/w51e7Q==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kH3Pm-0005LA-HH; Sat, 12 Sep 2020 11:09:54 +0000 Received: from mail-pj1-x1041.google.com ([2607:f8b0:4864:20::1041]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kH3OW-0004ot-6d for linux-arm-kernel@lists.infradead.org; Sat, 12 Sep 2020 11:08:38 +0000 Received: by mail-pj1-x1041.google.com with SMTP id a9so2993663pjg.1 for ; Sat, 12 Sep 2020 04:08:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=F4tHM0L8tNnxsWtLsTsMp6Ii6Rnl8nRf7R1d/DJ5GX0=; b=Fl2bqtSL2iiRfZluzSWOTXzNL8dmVQDhsUPUUB10qGGSvjXPumusHfP3CokhnSfKCH +t1jc2Q7OaXG85BoTd0A91s9q9C//+V6czJh5bMgwh6mcmDIOuQaMrCFly9wGejcGRUz s31sojad768defEHNH0ElcsN5owiLsEYQ0XZ8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=F4tHM0L8tNnxsWtLsTsMp6Ii6Rnl8nRf7R1d/DJ5GX0=; b=KKkljmcodQGF30tHND0tAENC6iN05UPfqwFUI48jNWOiv/WQc8DAV3danIOBRhIKXd ozAtk6Uz+EXRlV1HpJfVqkeYVcvsQ14TtCY5u6O1XqJWkBfxU+DKyC2cglMASZeYXb98 dwrov6WdKDTTFK5td9msRN4Qaj5llj0GAYPW8zKiN6tD0Ifhy5TizVld7aIsdsrQZE0/ XyFuP2PNS0S3jKaoqET4dDFBhbhMRiUaWObGI4BVdXgQ2vkFsGaYhS6BaC29BzYt02+q KiLPyTHzUntZ6l0YNLzfOEFwKGvSnPbS/CAfELr1jp1gB0CM3gvlv96kNNL0Ika5cDMn HNfQ== X-Gm-Message-State: AOAM531A2KNhfGeH7QN18Drg90lnJlEWCxpLi4qnYyodN0IP1wcZjLdf P/YhTBpRrw9yO1HX1ERjdiJGaA== X-Google-Smtp-Source: ABdhPJxIVZvhB1EkQWrlPCCU/1v4hWzLbZ0KeU8jimuCS6pLb+8hNC5hU2kfhglj/9om5Lrdkt4vIA== X-Received: by 2002:a17:90b:374b:: with SMTP id ne11mr5637226pjb.21.1599908913988; Sat, 12 Sep 2020 04:08:33 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id m24sm4069132pgn.44.2020.09.12.04.08.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 12 Sep 2020 04:08:27 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Subject: [PATCH 11/15] selftests/seccomp: Remove SYSCALL_NUM_RET_SHARE_REG in favor of SYSCALL_RET_SET Date: Sat, 12 Sep 2020 04:08:16 -0700 Message-Id: <20200912110820.597135-12-keescook@chromium.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200912110820.597135-1-keescook@chromium.org> References: <20200912110820.597135-1-keescook@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200912_070836_300623_041A55F0 X-CRM114-Status: GOOD ( 16.35 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thadeu Lima de Souza Cascardo , Will Drewry , Kees Cook , linux-xtensa@linux-xtensa.org, Michael Ellerman , linux-mips@vger.kernel.org, Andy Lutomirski , Max Filippov , linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Christian Brauner Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Instead of special-casing the specific case of shared registers, create a default SYSCALL_RET_SET() macro (mirroring SYSCALL_NUM_SET()), that writes to the SYSCALL_RET register. For architectures that can't set the return value (for whatever reason), they can define SYSCALL_RET_SET() without an associated SYSCALL_RET() macro. This also paves the way for architectures that need to do special things to set the return value (e.g. powerpc). Signed-off-by: Kees Cook --- tools/testing/selftests/seccomp/seccomp_bpf.c | 33 +++++++++++++------ 1 file changed, 23 insertions(+), 10 deletions(-) diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c index 2790d9cd50f4..623953a53032 100644 --- a/tools/testing/selftests/seccomp/seccomp_bpf.c +++ b/tools/testing/selftests/seccomp/seccomp_bpf.c @@ -1753,8 +1753,8 @@ TEST_F(TRACE_poke, getpid_runs_normally) #elif defined(__s390__) # define ARCH_REGS s390_regs # define SYSCALL_NUM(_regs) (_regs).gprs[2] -# define SYSCALL_RET(_regs) (_regs).gprs[2] -# define SYSCALL_NUM_RET_SHARE_REG +# define SYSCALL_RET_SET(_regs, _val) \ + TH_LOG("Can't modify syscall return on this architecture") #elif defined(__mips__) # include # include @@ -1776,8 +1776,8 @@ TEST_F(TRACE_poke, getpid_runs_normally) else \ (_regs).regs[2] = _nr; \ } while (0) -# define SYSCALL_RET(_regs) (_regs).regs[2] -# define SYSCALL_NUM_RET_SHARE_REG +# define SYSCALL_RET_SET(_regs, _val) \ + TH_LOG("Can't modify syscall return on this architecture") #elif defined(__xtensa__) # define ARCH_REGS struct user_pt_regs # define SYSCALL_NUM(_regs) (_regs).syscall @@ -1804,9 +1804,26 @@ TEST_F(TRACE_poke, getpid_runs_normally) SYSCALL_NUM(_regs) = (_nr); \ } while (0) #endif +/* + * Most architectures can change the syscall return value by just + * writing to the SYSCALL_RET register. This is the default if not + * defined above. If an architecture cannot set the return value + * (for example when the syscall and return value register is + * shared), report it with TH_LOG() in an arch-specific definition + * of SYSCALL_RET_SET() above, and leave SYSCALL_RET undefined. + */ +#if !defined(SYSCALL_RET) && !defined(SYSCALL_RET_SET) +# error "One of SYSCALL_RET or SYSCALL_RET_SET is needed for this arch" +#endif +#ifndef SYSCALL_RET_SET +# define SYSCALL_RET_SET(_regs, _val) \ + do { \ + SYSCALL_RET(_regs) = (_val); \ + } while (0) +#endif /* When the syscall return can't be changed, stub out the tests for it. */ -#ifdef SYSCALL_NUM_RET_SHARE_REG +#ifndef SYSCALL_RET # define EXPECT_SYSCALL_RETURN(val, action) EXPECT_EQ(-1, action) #else # define EXPECT_SYSCALL_RETURN(val, action) \ @@ -1870,11 +1887,7 @@ void change_syscall(struct __test_metadata *_metadata, /* If syscall is skipped, change return value. */ if (syscall == -1) -#ifdef SYSCALL_NUM_RET_SHARE_REG - TH_LOG("Can't modify syscall return on this architecture"); -#else - SYSCALL_RET(regs) = result; -#endif + SYSCALL_RET_SET(regs, result); /* Flush any register changes made. */ if (memcmp(&orig, ®s, sizeof(orig)) != 0) -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel