From nobody Mon May 25 08:10:53 2026 Received: from mail-pj1-f47.google.com (mail-pj1-f47.google.com [209.85.216.47]) (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 38BD1309F00 for ; Sun, 17 May 2026 02:49:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.47 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778986162; cv=none; b=PE9Y+HW1MilL66YDeZgOJGkBFx5MCE7osfhHat+zajc39BvwuzIEuzcbNyRTiRtb/ebavVquL1aTfV/oEaNfS+k03UG3wc3D4qs3yMJao3mcJ06Y6B1rE+bWLNCpbohJyRg1gU7f+iCR31QQsxWCetKDmKXDR100lF9LdGnre+s= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778986162; c=relaxed/simple; bh=NH2SFwFr7HqPBs9hvC65r/vssY7QD/UAv388ocixkzM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Kyph3OBGW7mvFclhrc8bO5RZXWcQ5LWh/M2+w7GEAFgwk+5kukRP52UnPy4K8r3apk66EVuu2laEWNZi/mG2fIpdR6QpyMurZrsN6UpFD+EB1P5XIsfJ9J36t1V9rhHXTfhc4iQsX5cE4hrtuelfA2sU4fEyvJOjNpxKDjoT9Ls= 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=hHXpGwaI; arc=none smtp.client-ip=209.85.216.47 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="hHXpGwaI" Received: by mail-pj1-f47.google.com with SMTP id 98e67ed59e1d1-36974220e45so306136a91.0 for ; Sat, 16 May 2026 19:49:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1778986160; x=1779590960; 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; bh=KYzMYICmp/8Se4bNvpYs1oVfnyhZqZImf/rtPm9GYAE=; b=hHXpGwaIRtHn0B2FIkuIhPlMBRiEXMPN5lrP7TDO+rR7A5SKWDOv2IeC04jFGdWnSn FcUys4qjk8TH9H/JQMZB46mXfrI+9W0Qf0/2I4VBGZHhC9w//nJciixEfZqfHwyIXagG JTADKBZp9nS5RNRkv2RxmI1yp6A4hm3iDJam5IrAoRRgM5SMiRkWU/fXwTqQwq/waINX /rdsSw68EtLcbXOK0NuqTqbhtStt3hqZo+5PJtRhoP1YDUJl+Gm3H8GufTM0Ln1s0bpB 3DzV/hfPAuKX3iQngc2vA55Bv3XhYH6/5tpWyrcMFle6mJUday6MYA+edpFXy7r+t6j5 Vy4w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778986160; x=1779590960; 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; bh=KYzMYICmp/8Se4bNvpYs1oVfnyhZqZImf/rtPm9GYAE=; b=TO9miF+2OLwuc41dRhyi7bpUZRrkhLKkGNdkpK2Q+MDTANQbW5jjJS3uy49Z6dIOAq A1+VPToQZ+ETtsQyaTAd2YGGQHwNwB3lwtfexLrmeGp3n5GwT7n92JGFBUS/qnbDdDIx 6T22IEMzLf4aHfIp0GOKyg7Nt64GZ1dbgwQJB9QW1OnGY/EW0pYKboklOTNQ9tXa4deJ zHvNBnLAN4pWNUJpOVQDqR5WOPQ9wHi2buX9PgYC+aR814Mjo8V6iXxS6aLJgPgM/Qk3 BLZWdIpi2nTEYg/hfXPeOEuKkTwguYH1ijU4+GXWoUeHiy9XPf+bTxyGssJM6z9KWGyr Ppcg== X-Gm-Message-State: AOJu0YzYoWv5uE6gZDM1wd0fwShCbsExHUicUS0UXdliBlnEJDCuTgoc Q1ojRS7nZL+OSRLmXCabyL+qjvL3x5A0WVmhXmyo0gjsi1DPc/MVpUOXSzlcCxOE X-Gm-Gg: Acq92OEFDH9HSyf5FvDFdSYBnTqxfQtsGGZyLTed/cCGu2JJBnkOzhYc0JRAfSH84A7 XOOrls5yEpjhmqPurYfMNaIslqVrPBEG/UgKPa7iBuPDFbfOh3OBnGQZkx3FcZS8h8ZHwGhmSwv 8+G6YDdM4sKI4/Gs1uKyCS28VEa+ecOvB9Y6r1gWxhC7eKE+03qYnrD0gf9n519DlHi4kwwd1+1 Bd+FjTA2rsSO0pdj0bPgxH85OVOvDU9mLMDh7JLV9k7H5DXUw/aLfnIZWIwKr7+0D0eknlld4I7 DmIk2Zx4X2wGnQCMLcLZa2ytWHJpSAYS+AqbW+wfrQ6EG4kwMl4C1ReOO5pGq0gf/jgVrgG/vmN cKiaF28BsBjFTmgxcgaUoyS2xgArItD8yqnf8E/eqAFs8kghfzYXKWOgGgrslDjOtcNt16BKG2J mgVORxmxCIRkRe24TIitAF5hHferI= X-Received: by 2002:a17:90b:5708:b0:365:8fd4:925c with SMTP id 98e67ed59e1d1-3695149986amr7230576a91.8.1778986160285; Sat, 16 May 2026 19:49:20 -0700 (PDT) Received: from fedora ([2401:4900:5305:3232:5f10:31f8:2e86:7ce7]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3696e550dfcsm1975678a91.1.2026.05.16.19.49.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 16 May 2026 19:49:19 -0700 (PDT) From: Mayank Gite To: linux-kernel@vger.kernel.org Cc: Mayank Gite Subject: [PATCH] samples/seccomp: enforce an architecture for bpf-fancy seccomp sample Date: Sun, 17 May 2026 08:15:09 +0530 Message-ID: <20260517024516.29461-2-drapl0n.kernel@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" - Enforce user specified architecture for bpf-fancy seccomp sample. - Kills the thread if user specified architecture does not match system architecture. Signed-off-by: Mayank Gite --- samples/seccomp/bpf-fancy.c | 11 ++++++++++- samples/seccomp/bpf-helper.h | 8 +++++++- 2 files changed, 17 insertions(+), 2 deletions(-) diff --git a/samples/seccomp/bpf-fancy.c b/samples/seccomp/bpf-fancy.c index 1ccb435025b6..8a966da890b3 100644 --- a/samples/seccomp/bpf-fancy.c +++ b/samples/seccomp/bpf-fancy.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -26,6 +27,14 @@ =20 int main(int argc, char **argv) { + if (argc < 2) { + fprintf(stderr, "Usage:\n" + "bpf-fancy \n" + "Help: AUDIT_ARCH_I386: 0x%X\n" + " AUDIT_ARCH_X86_64: 0x%X\n" + "\n", AUDIT_ARCH_I386, AUDIT_ARCH_X86_64); + return -1; + } struct bpf_labels l =3D { .count =3D 0, }; @@ -34,7 +43,7 @@ int main(int argc, char **argv) char buf[256]; struct sock_filter filter[] =3D { /* TODO: LOAD_SYSCALL_NR(arch) and enforce an arch */ - LOAD_SYSCALL_NR, + LOAD_SYSCALL_NR(strtol(argv[1], NULL, 0)), SYSCALL(__NR_exit, ALLOW), SYSCALL(__NR_exit_group, ALLOW), SYSCALL(__NR_write, JUMP(&l, write_fd)), diff --git a/samples/seccomp/bpf-helper.h b/samples/seccomp/bpf-helper.h index 417e48a4c4df..246a50d8a0af 100644 --- a/samples/seccomp/bpf-helper.h +++ b/samples/seccomp/bpf-helper.h @@ -17,6 +17,7 @@ =20 #include /* for __BITS_PER_LONG */ #include +#include #include #include /* for seccomp_data */ #include @@ -256,7 +257,12 @@ union arg64 { jt, \ BPF_STMT(BPF_LD+BPF_MEM, 1) =20 -#define LOAD_SYSCALL_NR \ +#define LOAD_SYSCALL_NR(_arch) \ + BPF_STMT(BPF_LD + BPF_W + BPF_ABS, \ + offsetof(struct seccomp_data, arch)), \ + BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, \ + _arch, 1, 0), \ + DENY, \ BPF_STMT(BPF_LD+BPF_W+BPF_ABS, \ offsetof(struct seccomp_data, nr)) =20 --=20 2.53.0