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Mon, 11 Jan 2021 12:42:00 +0000 (UTC) Date: Mon, 11 Jan 2021 07:42:00 -0500 (EST) From: Miroslav Rezanina To: Thomas Huth Message-ID: <115622555.32388560.1610368920610.JavaMail.zimbra@redhat.com> In-Reply-To: <88c2eb01-f8f5-18d5-6513-57322930cc77@redhat.com> References: <5acb5521-fdd2-e511-9cc3-176086183dd5@redhat.com> <88c2eb01-f8f5-18d5-6513-57322930cc77@redhat.com> Subject: Re: [RHEL7 qemu-kvm PATCH 2/3] s390x: Fix vm name copy length MIME-Version: 1.0 X-Originating-IP: [10.40.192.93, 10.4.195.19] Thread-Topic: s390x: Fix vm name copy length Thread-Index: J7Fgm/15RokU5bgow+nYzhFnPHpRLQ== X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mrezanin@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 client-ip=63.128.21.124; envelope-from=mrezanin@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.251, 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_H4=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 , Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" ----- Original Message ----- > From: "Thomas Huth" > To: "Philippe Mathieu-Daud=C3=A9" , mrezanin@redhat.co= m, qemu-devel@nongnu.org, "qemu-s390x" > > Sent: Monday, January 11, 2021 1:24:57 PM > Subject: Re: [RHEL7 qemu-kvm PATCH 2/3] s390x: Fix vm name copy length >=20 > On 11/01/2021 13.10, Philippe Mathieu-Daud=C3=A9 wrote: > > Hi Miroslav, > >=20 > > On 1/11/21 12:30 PM, mrezanin@redhat.com wrote: > >> From: Miroslav Rezanina > >> > >> There are two cases when vm name is copied but closing \0 can be lost > >> in case name is too long (>=3D256 characters). > >> > >> Updating length to copy so there is space for closing \0. > >> > >> Signed-off-by: Miroslav Rezanina > >> --- > >> target/s390x/kvm.c | 2 +- > >> target/s390x/misc_helper.c | 4 +++- > >> 2 files changed, 4 insertions(+), 2 deletions(-) > >> > >> diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c > >> index b8385e6b95..2313b5727e 100644 > >> --- a/target/s390x/kvm.c > >> +++ b/target/s390x/kvm.c > >> @@ -1918,7 +1918,7 @@ static void insert_stsi_3_2_2(S390CPU *cpu, __u6= 4 > >> addr, uint8_t ar) > >> */ > >> if (qemu_name) { > >> strncpy((char *)sysib.ext_names[0], qemu_name, > >> - sizeof(sysib.ext_names[0])); > >> + sizeof(sysib.ext_names[0]) - 1); > >> } else { > >> strcpy((char *)sysib.ext_names[0], "KVMguest"); > >> } > >=20 > > What about using strpadcpy() instead? >=20 > Yes, strpadcpy is the better way here - this field has to be padded with > zeroes, so doing "- 1" is wrong here. Hi Thomas, as I wrote in reply to Phillipe - the array is memset to zeroes before the = if so we are sure it's padded with zeroes (in this occurrence, not true for second o= ne). Mirek >=20 > Thomas >=20 --=20 Miroslav Rezanina Software Engineer - Virtualization Team Maintainer