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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cc4f712a817sm1292816a12.2.2026.09.14.09.16.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 14 Sep 2026 09:16:43 -0700 (PDT) Message-ID: <2e989526-983e-4056-87da-7aad0f79fc98@oss.qualcomm.com> Date: Tue, 15 Sep 2026 00:16:39 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/4] Bluetooth: coredump: Fix btmon heap-buffer-overflow To: Luiz Augusto von Dentz Cc: Marcel Holtmann , Abhishek Pandit-Subedi , Manish Mandlik , Zijun Hu , Luiz Augusto von Dentz , linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260913-misc_fix-v1-0-558c1e4028b9@oss.qualcomm.com> <20260913-misc_fix-v1-2-558c1e4028b9@oss.qualcomm.com> Content-Language: en-US From: Zijun Hu In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTE0MDIzMiBTYWx0ZWRfX/jugSFcKBgD+ amwoHMbIzUvHWjxMRs4bNxg3HwkP6X1ynbA7lxDnpkRt3tUKi40JbooCPyC0H1XHk7EkYla8Qe3 ryXcX92gXAcF5zhDXHewyM77S9C7sSSkFFKkzdSdRv8NV7r3kn3fBkzIAErMYVHxZz+fFkRabZp DzVdSpYBbit2B9I2Y6/ZSzTniW3lYGNa3tUwq2BSvrEAJKyv96q7Purwsd1vlGZm1cwlcfo58kG drdPq5v3t9i0nh+g9jPX1QOU4rFPs+MmKpEMhGRIAYFWZ1moGOLWgkUKKdgjWXSsjbKIufznsaT Gk6VZLO5wEMpVe/fgRAQ66iJXw1gEiFdCWdCOyFJGsIbFugcZy0ZDTFahTvRfZbaPEPqNFVBKbL ro2THiUf56m2ifk3/YEDzBJmgNcG9j+N0qb0CzYQ+GNerpFFFFYSfvRpdXqWEq5XD2IO0tUOvxP 6s1W3GzYUDn+PzzIRiQ== X-Authority-Analysis: v=2.4 cv=IZwSymqa c=1 sm=1 tr=0 ts=6aa81ded cx=c_pps a=oF/VQ+ItUULfLr/lQ2/icg==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=P7WIEfRXt6mtrGuOy4wA:9 a=QEXdDO2ut3YA:10 a=3WC7DwWrALyhR5TkjVHa:22 X-Proofpoint-GUID: Xs_7wjEp00Cd_jNFi1SWNS_Ufh9AxfNq X-Proofpoint-Spam-Info: AW1haW4tMjYwOTE0MDIzMiBTYWx0ZWRfX3gDIAxia0u6Y Ok9vGbs7YnNYkaPoLpS6sadJBksJr+PVBSSw9C8hho7xYUOofgwhqK69SRCNcoP0jRkqAB+h9QA eNo49xzDPCYj1aZrbtl/WSs1yZy4NfU= X-Proofpoint-ORIG-GUID: Xs_7wjEp00Cd_jNFi1SWNS_Ufh9AxfNq X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-14_03,2026-09-14_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 adultscore=0 impostorscore=0 malwarescore=0 phishscore=0 clxscore=1015 bulkscore=0 lowpriorityscore=0 priorityscore=1501 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609140232 On 9/14/2026 10:05 PM, Luiz Augusto von Dentz wrote: >> Issue: >> ERROR: AddressSanitizer: heap-buffer-overflow on address 0x51b00000065c at pc 0x7f50b987a029 bp 0x7ffde88dc8d0 sp 0x7ffde88dc088 >> READ of size 17916 at 0x51b00000065c thread T0 >> #0 0x7f50b987a028 in write ../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:1096 >> #1 0x5b4f3443ae3a in btsnoop_write ../src/shared/btsnoop.c:289 >> #2 0x5b4f3429cbf0 in data_callback ../monitor/control.c:969 >> #3 0x5b4f3444fa9d in mainloop_run ../src/shared/mainloop.c:104 >> #4 0x5b4f34451da6 in mainloop_run_with_signal ../src/shared/mainloop-notify.c:196 >> #5 0x5b4f342953fc in main ../monitor/main.c:303 >> #6 0x7f50b8c2a1c9 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58 >> #7 0x7f50b8c2a28a in __libc_start_main_impl ../csu/libc-start.c:360 >> #8 0x5b4f34295ed4 in _start (/usr/bin/btmon+0x29fed4) (BuildId: b41caafb24db693946c283eaea48112186863d2d) > This probably needs to be fixed in btmon if it attempts to read past > the buffer size. Also, since it now supports vendor packets that may Agree, will fix on the btmon side. > not be limited by HCI packet size, perhaps we should allocate based on > the channel MTU which probably needs per-vendor configuration to allow > collecting its vendor packets. This issue has nothing to do with HCI_VENDOR_PKT (0xff). This problem has likely existed for a long time across almost every vendor's devcoredump since controller's RAM size almost >= 1490 The root cause is that devcoredump data accumulated from MANY MANY packets is being sent as a SINGLE DIAG packet to monitor channel.