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Wed, 12 May 2021 04:02:54 +0000 (GMT) From: Ilya Leoshkevich To: Cornelia Huck , Peter Maydell , Paolo Bonzini , Richard Henderson , Eduardo Habkost Subject: [PATCH 1/2] target/i386: Make sure that vsyscall's tb->size != 0 Date: Wed, 12 May 2021 06:02:49 +0200 Message-Id: <20210512040250.203953-2-iii@linux.ibm.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210512040250.203953-1-iii@linux.ibm.com> References: <20210512040250.203953-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: s91yypgJhrYVG9zRB5QVzr6-lu0vlU0r X-Proofpoint-GUID: qHA_SZhd-baVH2BAn1V-NUBJO8RTY8wq X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.761 definitions=2021-05-12_01:2021-05-11, 2021-05-12 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 lowpriorityscore=0 mlxscore=0 bulkscore=0 adultscore=0 phishscore=0 mlxlogscore=999 impostorscore=0 clxscore=1015 suspectscore=0 malwarescore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2105120025 Received-SPF: pass client-ip=148.163.156.1; envelope-from=iii@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-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: Christian Borntraeger , qemu-devel@nongnu.org, Ilya Leoshkevich Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" tb_gen_code() assumes that tb->size must never be zero, otherwise it may produce spurious exceptions. For x86_64 this may happen when creating a translation block for the vsyscall page. Fix by pretending that vsyscall translation blocks have at least one instruction. Signed-off-by: Ilya Leoshkevich Reviewed-by: Richard Henderson --- target/i386/tcg/translate.c | 1 + 1 file changed, 1 insertion(+) diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c index 880bc45561..b5a2b981e2 100644 --- a/target/i386/tcg/translate.c +++ b/target/i386/tcg/translate.c @@ -8572,6 +8572,7 @@ static void i386_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu) */ if ((dc->base.pc_next & TARGET_PAGE_MASK) == TARGET_VSYSCALL_PAGE) { gen_exception(dc, EXCP_VSYSCALL, dc->base.pc_next); + dc->base.pc_next = dc->pc + 1; return; } #endif