From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ed1-f49.google.com (mail-ed1-f49.google.com [209.85.208.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 17954491589 for ; Sat, 10 Oct 2026 13:42:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.49 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791639743; cv=none; b=Yjiqb/WWP/bcmKu9XVr1SbuwkEXWt4ylWGZgUUTSNgpsq9bM8QbHH49MwXZpb0dLHFBQqz6ZeA1+TOlfemfIYgcw2l1i7HXj0ElJ2FNPHlOIboCi76RZeb8Oj7BEuJqJghMW6iDgUz63PEFVWgPmjE5zAVz39UPM3Isls8wBPlU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791639743; c=relaxed/simple; bh=U/nuTPW1GBByzTKEr0lQQY7u1zzIolnPL33tIXMx1cU=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=ELWu8Lq02t3CH8g1+wS44o9rF8GnlO/WQgn40igyscLxEwVJ/wtCwou67AAtqTZ/OuBQV/t6Yw+cIoQmNVF6mBgEtkNjCuGrEKrCjI9bPSKNtVCc5QJ35oa0RRWORcGYfSOtXoyPElmUa1hp0csy4yuV2IxqaFikgEWS1HbYN70= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=shPQVteU; arc=none smtp.client-ip=209.85.208.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="shPQVteU" Received: by mail-ed1-f49.google.com with SMTP id 4fb4d7f45d1cf-6af9a9451daso951391a12.0 for ; Sat, 10 Oct 2026 06:42:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1791639739; x=1792244539; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to:content-type; bh=Wqjj2AitxeO3NLrW4eTFLJLT15MYNUPf8jp++HuoGBI=; b=shPQVteUHnLgU3JPty5e1vWZpPxkneHim/8NhdvqMRETl4IytjdkAiFDnTdZeFa+ob g0EU6re6xblo3CfG+Tkycdc6CnQ0sRul1NXjl4rHuuxbF/wnkUkr1kgzK1p61oeJE2pb AveDQSo+8Dk/GpbHPd4uMfuVi+7DWISNUxp6Sy7m7hbgIdBgQJ/42m9mEr4QY5fQun6F BrxMk7T7aQQHkelm8u1vrj1suSVlwyzcCOe1GIfFsx4/DXONNV6CJVEn6Rf18wuD8bf6 RD7aSc4MHuusKMd0e81/ajQzbqx7M4i6PL3slLDP1nzelyWJLHwo3Y1GcIC9GiVvE3vg kbgg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1791639739; x=1792244539; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=Wqjj2AitxeO3NLrW4eTFLJLT15MYNUPf8jp++HuoGBI=; b=Jryg5pHGF6J+3asUWnQJtFmZAzUAhWBJMdJaChDQv3BLB/pwmxRO7GTpDwoTT7aQzf /OtF4ZxcGJ0qVzCnSRvihb4wjVvcE9V2gnVsCZIIEp8+3W+pKDkDSNqhMOnh9wqqiVVv jUgQGKNj0HkmFFZ3bJRL8fANWTBo2xI2V0Dkqk77OKZHXCsoPsWGWvu4acuejXLXO1Us cO7zHhXLV3yUCDH1CwCaOGGm3Ta9zDtbN8sfbWWi0OHR06kbEHKunn6M2f4HbYU+v3tv DruEO/v6bLaEA0FPA/fEx1Wy3HpeSf4CH1E3wQDZdcTZiNEde744PkC6/5hQRSd0/E0D jADg== X-Forwarded-Encrypted: i=1; AKwUvBxQH2fLcYckp69GPZI9VAW3314X8lY9Nen7rM2+4wtJfZLvRAmK3+tfwnqyPSvYHk2kuFkdCsNXsmgYAA==@vger.kernel.org X-Gm-Message-State: AFq9FYLuey1BHueJAsMel2Kqv0ou/8g7glGkEH8qGsV4AJV67IkHfYiW yPKQMymk/x01nSlfi7xwEzyxRmPWfUFYeyIyC3i5OaC+sj8nK1S45u93 X-Gm-Gg: AYBFou2HlDUwwXVDayYD7SV1SWbB/apCBJYHZ6jlT4J4L4ERnSg6pD62nRs/wo7MtAr wMYGTfK5XEyrVIUizKjhOExExZEYIP86DzdB2Ar9saanBnPgR6G/lu2Mr8ipqLTY/Qdgne17lod 6H1ZreFpstCVIq5pwnYztbJNbqZBa00JPc5vVa7HFstqW8K9hVIlDoCxWPywwO5uqnsRdjhFM9Z VIg605dE1rxbPxEeWPFXy5LTyYVUBUTt0ADJdwxFJ0QzhKVQwBOGYKugBk93WhvRS1w3ydwBamF ytvXHfk5v9DYCA21fJc+neUutn2UCsERVnP0uPbSayRqDw6lhrwIB4hb3eLNNc0142Z6xT6azFx xB0c/wOjNeNM4drHP4XSr2jNvljkXEIxEfkRmFPhyptk+mL/jHjnYgSwy67/F2JkNOc6CRT6DtG 451eWZkbrWvdZ19bKqcX9oYZ1/dw/UAZxb2+cCoql5+DjnoPuB4SzPmFbBD4NTIFvilsBRZhGa6 4arVniRHEwFfSxztulr1G97VHMN+RmerHV2Z2zToyyuKBoFLiw= X-Received: by 2002:a05:6402:5018:b0:6aa:915a:f51e with SMTP id 4fb4d7f45d1cf-6b17c28ef6cmr4582411a12.17.1791639739001; Sat, 10 Oct 2026 06:42:19 -0700 (PDT) Received: from buildhost.darklands.se ([2001:9b1:ff:d701:51eb:176f:63d9:53f8]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6b179dd395dsm2704487a12.17.2026.10.10.06.42.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 10 Oct 2026 06:42:18 -0700 (PDT) From: Magnus Lindholm To: richard.henderson@linaro.org, mattst88@gmail.com, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org Cc: linmag7@gmail.com Subject: [PATCH v3] selftests/seccomp: add Alpha support to seccomp_bpf Date: Sat, 10 Oct 2026 15:42:00 +0200 Message-ID: <20261010134214.974565-1-linmag7@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-alpha@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Enable the seccomp BPF selftests on Alpha with a fallback seccomp syscall number and architecture-specific syscall register accessors. Use the NT_PRSTATUS register layout rather than struct pt_regs. The register set contains r0-r30 followed by pc and unique. Read and update the syscall number in r1, and set both r0 and the r19/a3 error flag when synthesizing syscall results. At syscall entry, r19 still contains the fourth syscall argument, so callers setting a synthetic return value must also set the syscall number to -1 to skip execution. Signed-off-by: Magnus Lindholm Reviewed-by: Matt Turner --- Changes in v3: - Drop the /proc/self/syscall availability check and its commit-message paragraph. Alpha selects HAVE_ARCH_TRACEHOOK. - Document that setting r19/a3 at syscall entry requires callers to also set the syscall number to -1. - Add Matt Turner's Reviewed-by after addressing his review comments. Changes in v2: - Use the NT_PRSTATUS layout for PTRACE_GETREGSET/PTRACE_SETREGSET. - Set the Alpha return value and error flag together. - Check for /proc/self/syscall at runtime (removed in v3). Validation on AlphaServer ES40, GCC 15.2.1, running 7.3.0-rc1-es40-tsunami-v5a+: - Standard v3 and the original baseline binary both report 98 pass, 1 fail, 12 skip. The common failure is the 30-second timeout in user_notification_wait_killable_after_reply. - A separate diagnostic build extending only that test's timeout to 180 seconds completes it in 34.938 seconds. The full diagnostic run reports 99 pass, 0 fail, 12 skip. No timeout change is in this patch. tools/testing/selftests/seccomp/seccomp_bpf.c | 26 +++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c index 0622bc2..79e8eb3 100644 --- a/tools/testing/selftests/seccomp/seccomp_bpf.c +++ b/tools/testing/selftests/seccomp/seccomp_bpf.c @@ -136,6 +136,8 @@ struct seccomp_data { # define __NR_seccomp 354 # elif defined(__x86_64__) # define __NR_seccomp 317 +# elif defined(__alpha__) +# define __NR_seccomp 514 # elif defined(__arm__) # define __NR_seccomp 383 # elif defined(__aarch64__) @@ -1754,6 +1756,30 @@ TEST_F(TRACE_poke, getpid_runs_normally) # define ARCH_REGS struct user_regs_struct # define SYSCALL_NUM(_regs) (_regs).orig_eax # define SYSCALL_RET(_regs) (_regs).eax +#elif defined(__alpha__) +/* NT_PRSTATUS contains r0-r30, pc and unique, not struct pt_regs. */ +struct alpha_regs { + unsigned long regs[33]; +}; + +# define ARCH_REGS struct alpha_regs +/* The kernel keeps the mutable syscall number in r1. */ +# define SYSCALL_NUM(_regs) ((_regs).regs[1]) +# define SYSCALL_RET(_regs) ((_regs).regs[0]) +/* + * Alpha returns positive errno in r0 with the r19/a3 error flag set. + * At a syscall-entry stop, r19 is still the fourth syscall argument. + * Callers must also set the syscall number to -1 to skip the syscall + * before replacing r19 with the error flag. + */ +# define SYSCALL_RET_SET(_regs, _val) \ + do { \ + struct alpha_regs *__regs = &(_regs); \ + long __ret = (_val); \ + \ + __regs->regs[0] = __ret < 0 ? -__ret : __ret; \ + __regs->regs[19] = __ret < 0; \ + } while (0) #elif defined(__arm__) # define ARCH_REGS struct pt_regs # define SYSCALL_NUM(_regs) (_regs).ARM_r7 -- 2.43.0