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Thu, 11 Jul 2024 23:25:09 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEKPLq4bwEEQ7m8jDmGIKGh5tkuQOLxMspeJp/ScuWtkpjEG2y3Abw2oXmm+w7JJi3TWkuZOw== X-Received: by 2002:a17:90b:4ac7:b0:2c8:3f5:37d2 with SMTP id 98e67ed59e1d1-2ca35c2e8d2mr9178479a91.20.1720765508778; Thu, 11 Jul 2024 23:25:08 -0700 (PDT) Received: from localhost.localdomain ([115.96.207.30]) by smtp.googlemail.com with ESMTPSA id 98e67ed59e1d1-2cacd404020sm644893a91.18.2024.07.11.23.25.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Jul 2024 23:25:08 -0700 (PDT) From: Ani Sinha To: =?utf-8?q?Marc-Andr=C3=A9_Lureau?= Cc: philmd@linaro.org, armbru@redhat.com, Ani Sinha , qemu-devel@nongnu.org Subject: [PATCH] hw/vmcoreinfo: make guest format endian safe Date: Fri, 12 Jul 2024 11:54:52 +0530 Message-ID: <20240712062452.31457-1-anisinha@redhat.com> X-Mailer: git-send-email 2.42.0 MIME-Version: 1.0 Received-SPF: pass client-ip=170.10.133.124; envelope-from=anisinha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.142, 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_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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Guest and host formats in struct FWCfgVMCoreInfo are written in little endian format. However, the hypervisor host might be big endian. We need to do appropriate conversions between the formats before comparing the values. Fix it. Signed-off-by: Ani Sinha Reviewed-by: Marc-André Lureau --- hw/misc/vmcoreinfo.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/hw/misc/vmcoreinfo.c b/hw/misc/vmcoreinfo.c index 833773ade5..e00df95e29 100644 --- a/hw/misc/vmcoreinfo.c +++ b/hw/misc/vmcoreinfo.c @@ -21,9 +21,10 @@ static void fw_cfg_vmci_write(void *dev, off_t offset, size_t len) { VMCoreInfoState *s = VMCOREINFO(dev); + uint16_t guest_format = le16_to_cpu(s->vmcoreinfo.guest_format); s->has_vmcoreinfo = offset == 0 && len == sizeof(s->vmcoreinfo) - && s->vmcoreinfo.guest_format != FW_CFG_VMCOREINFO_FORMAT_NONE; + && guest_format != FW_CFG_VMCOREINFO_FORMAT_NONE; } static void vmcoreinfo_reset(void *dev)