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Thu, 04 Feb 2021 11:41:36 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-15-QdpwJubTME-JAq9oeOJbzQ-1; Thu, 04 Feb 2021 11:41:25 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 260AC80402C; Thu, 4 Feb 2021 16:41:24 +0000 (UTC) Received: from thuth.com (ovpn-112-90.ams2.redhat.com [10.36.112.90]) by smtp.corp.redhat.com (Postfix) with ESMTP id 627965DEC1; Thu, 4 Feb 2021 16:41:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1612456894; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=UpWiyjueqJEJtOXymDajSybtd0fe5yV4PWLr9bpJQ9s=; b=dUMLll0/vzMp6OlgNcqURDGlN1jXhRP2FyLbLCIR48nYG1YECh29tewPuBHzngEjW1WZf0 jSIz5dktiwbWjTFwZhe2jeRmFthLToJkS/0QmUlXPXfTbp2aCYw830sCKaJ5kMUt2KZ5n5 WBRH3U5uv77S8VKDKjjd7AFBIMaLOww= X-MC-Unique: QdpwJubTME-JAq9oeOJbzQ-1 From: Thomas Huth To: qemu-devel@nongnu.org, Cornelia Huck , Christian Borntraeger Subject: [PATCH v2] target/s390x/arch_dump: Fixes for the name field in the PT_NOTE section Date: Thu, 4 Feb 2021 17:41:17 +0100 Message-Id: <20210204164117.721110-1-thuth@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=thuth@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=216.205.24.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.351, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-s390x@nongnu.org, Richard Henderson , David Hildenbrand Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) According to the "ELF-64 Object File Format" specification: "The first word in the entry, namesz, identifies the length, in bytes, of a name identifying the entry=E2=80=99s owner or originator. The = name field contains a null-terminated string, with padding as necessary to ensure 8- byte alignment for the descriptor field. The length does not include the terminating null or the padding." So we should not include the terminating NUL in the length field here. Also there is a compiler warning with GCC 9.3 when compiling with the -fsanitize=3Dthread compiler flag: In function 'strncpy', inlined from 's390x_write_elf64_notes' at ../target/s390x/arch_dump.c:2= 19:9: /usr/include/x86_64-linux-gnu/bits/string_fortified.h:106:10: error: '__builtin_strncpy' specified bound 8 equals destination size [-Werror=3Dstringop-truncation] Since the name should always be NUL-terminated, let's use g_strlcpy() to silence this warning. And while we're at it, also add an assert() to make sure that the provided names always fit the size field (which is fine for the current callers, the function is called once with "CORE" and once with "LINUX" as a name). Signed-off-by: Thomas Huth --- v2: Use g_strlcpy instead of strncpy target/s390x/arch_dump.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/target/s390x/arch_dump.c b/target/s390x/arch_dump.c index 50fa0ae4b6..f205123834 100644 --- a/target/s390x/arch_dump.c +++ b/target/s390x/arch_dump.c @@ -212,11 +212,13 @@ static int s390x_write_elf64_notes(const char *note_n= ame, int note_size; int ret =3D -1; =20 + assert(strlen(note_name) < sizeof(note.name)); + for (nf =3D funcs; nf->note_contents_func; nf++) { memset(¬e, 0, sizeof(note)); - note.hdr.n_namesz =3D cpu_to_be32(strlen(note_name) + 1); + note.hdr.n_namesz =3D cpu_to_be32(strlen(note_name)); note.hdr.n_descsz =3D cpu_to_be32(nf->contents_size); - strncpy(note.name, note_name, sizeof(note.name)); + g_strlcpy(note.name, note_name, sizeof(note.name)); (*nf->note_contents_func)(¬e, cpu, id); =20 note_size =3D sizeof(note) - sizeof(note.contents) + nf->contents_= size; --=20 2.27.0