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Iglesias" , Brian Cain , Song Gao , Xiaojuan Yang , Laurent Vivier , Aurelien Jarno , Jiaxun Yang , Aleksandar Rikalo , Chris Wulff , Marek Vasut , Stafford Horne , Daniel Henrique Barboza , =?utf-8?q?C=C3=A9dric_Le_G?= =?utf-8?q?oater?= , David Gibson , Greg Kurz , Nicholas Piggin , Palmer Dabbelt , Alistair Francis , Bin Meng , Weiwei Li , Liu Zhiwei , Yoshinori Sato , David Hildenbrand , Ilya Leoshkevich , Mark Cave-Ayland , Artyom Tarasenko , Bastian Koppelmann , Max Filippov , qemu-devel@nongnu.org, qemu-arm@nongnu.org, qemu-ppc@nongnu.org, qemu-riscv@nongnu.org, qemu-s390x@nongnu.org, Anton Kochkov , Akihiko Odaki Subject: [PATCH v4 14/25] gdbstub: Dynamically allocate target.xml buffer Date: Wed, 16 Aug 2023 23:51:35 +0900 Message-ID: <20230816145155.21049-15-akihiko.odaki@daynix.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230816145155.21049-1-akihiko.odaki@daynix.com> References: <20230816145155.21049-1-akihiko.odaki@daynix.com> MIME-Version: 1.0 Received-SPF: none client-ip=2607:f8b0:4864:20::42f; envelope-from=akihiko.odaki@daynix.com; helo=mail-pf1-x42f.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org There is no guarantee that target.xml fits in 1024 bytes, and the fixed buffer length requires tedious buffer overflow check. Dynamically allocate the target.xml buffer to resolve these problems. Suggested-by: Alex Bennée Signed-off-by: Akihiko Odaki --- gdbstub/internals.h | 2 +- gdbstub/gdbstub.c | 44 ++++++++++++++++++++++++-------------------- gdbstub/softmmu.c | 2 +- 3 files changed, 26 insertions(+), 22 deletions(-) diff --git a/gdbstub/internals.h b/gdbstub/internals.h index f2b46cce41..4876ebd74f 100644 --- a/gdbstub/internals.h +++ b/gdbstub/internals.h @@ -33,7 +33,7 @@ typedef struct GDBProcess { uint32_t pid; bool attached; - char target_xml[1024]; + char *target_xml; } GDBProcess; enum RSState { diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c index c2ce970c98..452b5bf0ef 100644 --- a/gdbstub/gdbstub.c +++ b/gdbstub/gdbstub.c @@ -366,33 +366,37 @@ static const char *get_feature_xml(const char *p, const char **newp, name = NULL; if (strncmp(p, "target.xml", len) == 0) { - char *buf = process->target_xml; - const size_t buf_sz = sizeof(process->target_xml); - /* Generate the XML description for this CPU. */ - if (!buf[0]) { + if (!process->target_xml) { + g_autoptr(GPtrArray) a = g_ptr_array_new_with_free_func(g_free); GDBRegisterState *r; - pstrcat(buf, buf_sz, - "" - "" - ""); + g_ptr_array_add( + a, + g_strdup("" + "" + "")); if (cc->gdb_arch_name) { - pstrcat(buf, buf_sz, ""); - pstrcat(buf, buf_sz, cc->gdb_arch_name(cpu)); - pstrcat(buf, buf_sz, ""); + g_ptr_array_add( + a, + g_markup_printf_escaped("%s", + cc->gdb_arch_name(cpu))); } - pstrcat(buf, buf_sz, "gdb_core_feature->xmlname); - pstrcat(buf, buf_sz, "\"/>"); + g_ptr_array_add( + a, + g_markup_printf_escaped("", + cc->gdb_core_feature->xmlname)); for (r = cpu->gdb_regs; r; r = r->next) { - pstrcat(buf, buf_sz, "feature->xmlname); - pstrcat(buf, buf_sz, "\"/>"); + g_ptr_array_add( + a, + g_markup_printf_escaped("", + r->feature->xmlname)); } - pstrcat(buf, buf_sz, ""); + g_ptr_array_add(a, g_strdup("")); + g_ptr_array_add(a, NULL); + process->target_xml = g_strjoinv(NULL, (void *)a->pdata); } - return buf; + return process->target_xml; } if (cc->gdb_get_dynamic_xml) { char *xmlname = g_strndup(p, len); @@ -2270,6 +2274,6 @@ void gdb_create_default_process(GDBState *s) process = &s->processes[s->process_num - 1]; process->pid = pid; process->attached = false; - process->target_xml[0] = '\0'; + process->target_xml = NULL; } diff --git a/gdbstub/softmmu.c b/gdbstub/softmmu.c index f509b7285d..5282324764 100644 --- a/gdbstub/softmmu.c +++ b/gdbstub/softmmu.c @@ -293,7 +293,7 @@ static int find_cpu_clusters(Object *child, void *opaque) assert(cluster->cluster_id != UINT32_MAX); process->pid = cluster->cluster_id + 1; process->attached = false; - process->target_xml[0] = '\0'; + process->target_xml = NULL; return 0; }