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[189.204.159.168]) by smtp.gmail.com with ESMTPSA id i3sm640135oov.2.2021.03.24.09.46.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Mar 2021 09:46:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=fOau8rpDDHl9c/Ot3yQk8tZ8xyCg6pIUYZPgecScZk4=; b=XE1KKA95WZ5kfDYoUPbaG4Ub5tJFLaZ++ux+ip33N4fFddeS+UWWzGWiO5/mP4wNLt +EcxVAzQjjSkpcb+wVQYgKJYM6DfWDPtSTXhwZfTRrMYI7cdEWIsX8E+k8oHBf5mZg0y bsPGqXc58TTxbfAU3xz42kCYGumaBadq2Wb9C/b7cUpSRqoChaaEeD9hdmT+eXeykwPD pC2ABcyU4C4JKwSHYmbGpFQj0jUBe7tfTclh0/Zjfp81iO9QcknRYzv6Op/lUrV3Lbhz C/KBA/U6DD+3pqSNXqLFwTvJeFiCmbh9j8g4rhcoMDoQY8QXCL3hAlUjcTIkT/Ibn92I A/lw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=fOau8rpDDHl9c/Ot3yQk8tZ8xyCg6pIUYZPgecScZk4=; b=mljn8GVVz6X7yizjfARlpcSKUEcF3F5+v+GuaVJq2AjQfukDGWFrzIYYHePIKJXR+q UtJUA26UQnLK8s1prkb4gs/gvlcHGGUoZIllGcUTXAryDoDu/EMCgxjZ9VOEsXya+JlR fEF6wKugKNvdxCuGqucegQzK751sxDP0vcAOYqVmZWlVNj81TnzdtwsgSliGKUny7Lq0 gnP/FwtWrkq6jPxG3pOXMMWtmtkAI2Bwls1CtfaA8fxMc+QHBBQSrXfarxevY4G5xA6A 7ZOvTy1BgiGd1b8051Wb4PIEhOK5iv7LB+Ki9rDoItKTzd28DNMneO5nbLF0GcVA8zZ7 nF/A== X-Gm-Message-State: AOAM531zckNjgDBy4/NWMImmZrl69e87gcKSwnzHxpUUoQhHeqKbXt1S cPXrKc+hcOpTyE6iXG9H7QhpgMWRvaURk3KE X-Google-Smtp-Source: ABdhPJzz8Zs79y0arvPVLlWyirQ7LMj86dvJzTNMhpP3S9JZdSCJVXwqUuBPwzuH077YSSlEesY/Dg== X-Received: by 2002:a05:6830:1288:: with SMTP id z8mr4071365otp.5.1616604412343; Wed, 24 Mar 2021 09:46:52 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH] target/i386: Verify memory operand for lcall and ljmp Date: Wed, 24 Mar 2021 10:46:50 -0600 Message-Id: <20210324164650.128608-1-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 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=2607:f8b0:4864:20::32a; envelope-from=richard.henderson@linaro.org; helo=mail-ot1-x32a.google.com X-Spam_score_int: 12 X-Spam_score: 1.2 X-Spam_bar: + X-Spam_report: (1.2 / 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, RCVD_IN_SBL_CSS=3.335, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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: pbonzini@redhat.com, ehabkost@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) Content-Type: text/plain; charset="utf-8" These two opcodes only allow a memory operand. Lacking the check for a register operand, we used the A0 temp without initialization, which led to a tcg abort. Buglink: https://bugs.launchpad.net/qemu/+bug/1921138 Signed-off-by: Richard Henderson Acked-by: Paolo Bonzini --- target/i386/tcg/translate.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c index af1faf9342..880bc45561 100644 --- a/target/i386/tcg/translate.c +++ b/target/i386/tcg/translate.c @@ -5061,6 +5061,9 @@ static target_ulong disas_insn(DisasContext *s, CPUSt= ate *cpu) gen_jr(s, s->T0); break; case 3: /* lcall Ev */ + if (mod =3D=3D 3) { + goto illegal_op; + } gen_op_ld_v(s, ot, s->T1, s->A0); gen_add_A0_im(s, 1 << ot); gen_op_ld_v(s, MO_16, s->T0, s->A0); @@ -5088,6 +5091,9 @@ static target_ulong disas_insn(DisasContext *s, CPUSt= ate *cpu) gen_jr(s, s->T0); break; case 5: /* ljmp Ev */ + if (mod =3D=3D 3) { + goto illegal_op; + } gen_op_ld_v(s, ot, s->T1, s->A0); gen_add_A0_im(s, 1 << ot); gen_op_ld_v(s, MO_16, s->T0, s->A0); --=20 2.25.1