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GET /api/1.1/patches/2230512/?format=api
{ "id": 2230512, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2230512/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260429193007.1670335-1-stefanb@linux.ibm.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.1/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20260429193007.1670335-1-stefanb@linux.ibm.com>", "date": "2026-04-29T19:30:07", "name": "tpm_emulator: Limit number of bytes read from buffer to size of buffer", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "218d891d7054d1a3a2cf49dbb54cf50b8ccf14a7", "submitter": { "id": 75097, "url": "http://patchwork.ozlabs.org/api/1.1/people/75097/?format=api", "name": "Stefan Berger", "email": "stefanb@linux.ibm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260429193007.1670335-1-stefanb@linux.ibm.com/mbox/", "series": [ { "id": 502141, "url": "http://patchwork.ozlabs.org/api/1.1/series/502141/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=502141", "date": "2026-04-29T19:30:07", "name": "tpm_emulator: Limit number of bytes read from buffer to size of buffer", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/502141/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2230512/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2230512/checks/", "tags": {}, "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=HW+ZYvjP;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc\n :content-transfer-encoding:date:from:message-id:mime-version\n :subject:to; s=pp1; bh=CJmcDM5jgEjnPXBxj/7Ca1M+T8PXMWrF8WtKlxycV\n jc=; b=HW+ZYvjPpDlK63F34OmY4wQYONXF8kq6A04pIcnaR2rLsGOg/KYOlZvuG\n 8d8LVMu6rzuFBSxVwvCF4bBnQkHq8H//us6rgbDWjKRp4DkAqE396kd/sKE15LfD\n u/sXRV9eIxQ0p/X1u583nE7kaM1ZsxhtwMpMHwMXkanLpqoPxzTTLN8kPvkbkH4r\n 2BS4fdJVm9lQZvqL1OJ8NpK3PgnSpxNjGjvLLgK15XjmpeaIbvkYYQi9FjJISJVz\n 6c9wg28yQK+/aeHpgG64Z0OEB1uGOKBY/3g7juBAX67Tu++rvYXoxF9vb58Enjxq\n OGdFlUjh58VIAeKM1OmBqaxBu8uQQ==", "From": "Stefan Berger <stefanb@linux.ibm.com>", "To": "qemu-devel@nongnu.org", "Cc": "marcandre.lureau@redhat.com, armenon@redhat.com,\n Stefan Berger <stefanb@linux.ibm.com>", "Subject": "[PATCH] tpm_emulator: Limit number of bytes read from buffer to size\n of buffer", "Date": "Wed, 29 Apr 2026 19:30:07 +0000", "Message-ID": "<20260429193007.1670335-1-stefanb@linux.ibm.com>", "X-Mailer": "git-send-email 2.43.0", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-TM-AS-GCONF": "00", "X-Proofpoint-ORIG-GUID": "5M9hyLQxeb7H9T8Y75BzgIU4u0kRvJan", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNDI5MDE5MyBTYWx0ZWRfX9bHnoH5FtlDK\n ZCPJgCmON8rWAANfi7mp3Dxig4Weg9vCd61CLwSvaraxcwvLIzAYzZYvO0nDgAiRq9pBfu8A0cA\n thKgPjktdwbWQAWvTujWVs+AUiO+txsre/ClIC5dVi9rNresaZ0LL8LdTtd4IDPFyv8vcve0XGE\n AITMT4u99D7XEtoIcmH1Xlr48qa2gXDOPQyW0DyjpBmbU5EoNl1M4eMqZC/vHg8a0zGaAqU9Q+u\n eCOY/U9qHS4bbst7bjfvraYrmn1ekCCiKvBt3JYV45e5K2HkZGrJf5cEKTzawxAXCasADvxbVGX\n VmM9/LPn2XIfm92nX9AEP61/F0XFE/6qtSGUYWp0JtAEdioNvfm7cbpP5LBcJAfJVCnFsH1ckvx\n JMLEc0adNyKlFkdLm3nQHJzaEx6ptaDqSTOqXPCURUjWBFPxpyrGETIq3wR4PInSDsBfxSM+0qT\n U20Uwc4xyDaES4jDt2Q==", "X-Authority-Analysis": "v=2.4 cv=VZLH+lp9 c=1 sm=1 tr=0 ts=69f25c48 cx=c_pps\n a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17\n a=RUyTQ2W-OykcHckI:21 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22\n a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8\n a=89LiysFeuzQG30zlTEIA:9", "X-Proofpoint-GUID": "5M9hyLQxeb7H9T8Y75BzgIU4u0kRvJan", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-04-29_02,2026-04-28_01,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n clxscore=1015 suspectscore=0 adultscore=0 lowpriorityscore=0 phishscore=0\n spamscore=0 malwarescore=0 bulkscore=0 priorityscore=1501 impostorscore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604290193", "Received-SPF": "pass client-ip=148.163.158.5;\n envelope-from=stefanb@linux.ibm.com;\n helo=mx0b-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,\n DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7,\n RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001,\n 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": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "Limit the number of bytes read from the TPM response to the size of the\nreceiving buffer and drain the other bytes from the response by reading\nthem into a temporary buffer.\n\nThe size of the TPM's responses should fit into a buffer negotiated with\nthe tpm_emulator (swtpm). However, it is better to proactively limit the\nnumber of bytes read into the buffer by using the buffer's size as an\nupper limit.\n\nSigned-off-by: Stefan Berger <stefanb@linux.ibm.com>\n---\n backends/tpm/tpm_emulator.c | 23 ++++++++++++++++++++---\n 1 file changed, 20 insertions(+), 3 deletions(-)", "diff": "diff --git a/backends/tpm/tpm_emulator.c b/backends/tpm/tpm_emulator.c\nindex 75c33d290e..5e8bad1632 100644\n--- a/backends/tpm/tpm_emulator.c\n+++ b/backends/tpm/tpm_emulator.c\n@@ -176,8 +176,11 @@ static int tpm_emulator_unix_tx_bufs(TPMEmulator *tpm_emu,\n bool *selftest_done,\n Error **errp)\n {\n- ssize_t ret;\n bool is_selftest = false;\n+ uint8_t buffer[1024];\n+ size_t to_drain = 0;\n+ size_t to_read;\n+ ssize_t ret;\n \n if (selftest_done) {\n *selftest_done = false;\n@@ -195,13 +198,27 @@ static int tpm_emulator_unix_tx_bufs(TPMEmulator *tpm_emu,\n return -1;\n }\n \n+ to_read = tpm_cmd_get_size(out) - sizeof(struct tpm_resp_hdr);\n+ if (to_read > out_len) {\n+ to_drain = to_read - out_len;\n+ to_read = out_len;\n+ }\n+\n ret = qio_channel_read_all(tpm_emu->data_ioc,\n- (char *)out + sizeof(struct tpm_resp_hdr),\n- tpm_cmd_get_size(out) - sizeof(struct tpm_resp_hdr), errp);\n+ (char *)out + sizeof(struct tpm_resp_hdr), to_read, errp);\n if (ret != 0) {\n return -1;\n }\n \n+ while (to_drain) {\n+ to_read = MIN(to_drain, sizeof(buffer));\n+ ret = qio_channel_read_all(tpm_emu->data_ioc, buffer, to_read, errp);\n+ if (ret != 0) {\n+ return -1;\n+ }\n+ to_drain -= to_read;\n+ }\n+\n if (is_selftest) {\n *selftest_done = tpm_cmd_get_errcode(out) == 0;\n }\n", "prefixes": [] }