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(unknown [2a02:6b8:b081:6422::1:2a]) by mail-nwsmtp-smtp-corp-main-62.myt.yp-c.yandex.net (smtpcorp/Yandex) with ESMTPSA id geUBjG0OhCg0-7T42CIWK; Mon, 25 Sep 2023 22:41:06 +0300 X-Yandex-Fwd: 1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru; s=default; t=1695670866; bh=IrCX98+BsHKhBATyxoue5K4vzQ6/d4/0Hs7S3KTK9FM=; h=Message-Id:Date:In-Reply-To:Cc:Subject:References:To:From; b=WGZW/wygsfeliGPn25AjtNhNIVpXVOgTDqbham4jhZvUohndryQ3Mo7d+FWvKs90C fHPKXf2l96/0s9JemCWZeDqCPdNLuf4TeibA+w8ZFbMcO2f+IEvQ8tGCpMaeEJh8K+ PQNeaDWqJAqikwackXCjLrLOH+v6L4YTiXUWH5Pg= Authentication-Results: mail-nwsmtp-smtp-corp-main-62.myt.yp-c.yandex.net; dkim=pass header.i=@yandex-team.ru From: Vladimir Sementsov-Ogievskiy To: qemu-devel@nongnu.org Cc: pbonzini@redhat.com, vsementsov@yandex-team.ru, =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Peter Maydell , Thomas Huth , Richard Henderson Subject: [PATCH 01/12] hw/core/loader: load_at(): check size Date: Mon, 25 Sep 2023 22:40:29 +0300 Message-Id: <20230925194040.68592-2-vsementsov@yandex-team.ru> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230925194040.68592-1-vsementsov@yandex-team.ru> References: <20230925194040.68592-1-vsementsov@yandex-team.ru> MIME-Version: 1.0 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=2a02:6b8:c02:900:1:45:d181:df01; envelope-from=vsementsov@yandex-team.ru; helo=forwardcorp1b.mail.yandex.net X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, 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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @yandex-team.ru) X-ZM-MESSAGEID: 1695671018287100005 Content-Type: text/plain; charset="utf-8" This @size parameter often comes from fd. We'd better check it before doing read and allocation. Chose 1G as high enough empiric bound. Signed-off-by: Vladimir Sementsov-Ogievskiy --- hw/core/loader.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/hw/core/loader.c b/hw/core/loader.c index 4dd5a71fb7..4b67543046 100644 --- a/hw/core/loader.c +++ b/hw/core/loader.c @@ -281,11 +281,26 @@ ssize_t load_aout(const char *filename, hwaddr addr, = int max_sz, =20 /* ELF loader */ =20 +#define ELF_LOAD_MAX (1024 * 1024 * 1024) + static void *load_at(int fd, off_t offset, size_t size) { void *ptr; - if (lseek(fd, offset, SEEK_SET) < 0) + + /* + * We often come here with @size, which was previously read from file + * descriptor too. That's not good to read and allocate for unchecked + * number of bytes. Coverity also doesn't like it and generate problem= s. + * So, let's limit all load_at() calls to ELF_LOAD_MAX at least. + */ + if (size > ELF_LOAD_MAX) { return NULL; + } + + if (lseek(fd, offset, SEEK_SET) < 0) { + return NULL; + } + ptr =3D g_malloc(size); if (read(fd, ptr, size) !=3D size) { g_free(ptr); --=20 2.34.1