[{"id":3686682,"web_url":"http://patchwork.ozlabs.org/comment/3686682/","msgid":"","list_archive_url":null,"date":"2026-05-05T20:17:06","subject":"Re: [PATCH] net: mark struct ip6_header as QEMU_PACKED","submitter":{"id":93152,"url":"http://patchwork.ozlabs.org/api/people/93152/","name":"Pierrick Bouvier","email":"pierrick.bouvier@oss.qualcomm.com"},"content":"On 5/5/2026 1:13 PM, Peter Maydell wrote:\n> The ip6_header is often used by network devices to examine structures in\n> packet data, and it's not guaranteed to be aligned. This manifests as\n> errors from the clang sanitizer like this one:\n> \n> SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ../../hw/net/rocker/rocker_of_dpa.c:321:37\n> ../../hw/net/rocker/rocker_of_dpa.c:730:33: runtime error: member access within misaligned address 0x742970fe7ecd for type 'struct ip6_header', which requires 4 byte alignment\n> 0x742970fe7ecd: note: pointer points here\n> 00 00 02 81 00 60 00 00 00 00 38 3a ff fe 80 00 00 00 00 00 00 00 00 00 00 00 00 00 02 ff 02 00\n> ^\n> \n> Fix this by marking the ip6_header struct as QEMU_PACKED, the way we\n> have done to handle similar problems involving tcp_header, ip_header,\n> etc.\n> \n> Signed-off-by: Peter Maydell \n> ---\n> Found this one while I was working on a rocker bug.\n> \n> include/net/eth.h | 2 +-\n> 1 file changed, 1 insertion(+), 1 deletion(-)\n> \n\nReviewed-by: Pierrick Bouvier ","headers":{"Return-Path":"","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=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=QaXJ5N/j;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.a=rsa-sha256 header.s=google header.b=hZRRyzDj;\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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This manifests as\n> errors from the clang sanitizer like this one:\n> \n> SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ../../hw/net/rocker/rocker_of_dpa.c:321:37\n> ../../hw/net/rocker/rocker_of_dpa.c:730:33: runtime error: member access within misaligned address 0x742970fe7ecd for type 'struct ip6_header', which requires 4 byte alignment\n> 0x742970fe7ecd: note: pointer points here\n> 00 00 02 81 00 60 00 00 00 00 38 3a ff fe 80 00 00 00 00 00 00 00 00 00 00 00 00 00 02 ff 02 00\n> ^\n> \n> Fix this by marking the ip6_header struct as QEMU_PACKED, the way we\n> have done to handle similar problems involving tcp_header, ip_header,\n> etc.\n> \n> Signed-off-by: Peter Maydell \n> ---\n> Found this one while I was working on a rocker bug.\n> \n> include/net/eth.h | 2 +-\n> 1 file changed, 1 insertion(+), 1 deletion(-)\n\nReviewed-by: Philippe Mathieu-Daudé ","headers":{"Return-Path":"","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=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=mZcV+xvr;\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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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"8bit","Received-SPF":"pass client-ip=2a00:1450:4864:20::336;\n envelope-from=philmd@linaro.org; helo=mail-wm1-x336.google.com","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, 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 ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3687814,"web_url":"http://patchwork.ozlabs.org/comment/3687814/","msgid":"<0794f07a-0f71-4891-a1a3-5a2cabb4e7a5@linaro.org>","list_archive_url":null,"date":"2026-05-07T13:35:30","subject":"Re: [PATCH] net: mark struct ip6_header as QEMU_PACKED","submitter":{"id":85046,"url":"http://patchwork.ozlabs.org/api/people/85046/","name":"Philippe Mathieu-Daudé","email":"philmd@linaro.org"},"content":"On 5/5/26 22:13, Peter Maydell wrote:\n> The ip6_header is often used by network devices to examine structures in\n> packet data, and it's not guaranteed to be aligned. This manifests as\n> errors from the clang sanitizer like this one:\n> \n> SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ../../hw/net/rocker/rocker_of_dpa.c:321:37\n> ../../hw/net/rocker/rocker_of_dpa.c:730:33: runtime error: member access within misaligned address 0x742970fe7ecd for type 'struct ip6_header', which requires 4 byte alignment\n> 0x742970fe7ecd: note: pointer points here\n> 00 00 02 81 00 60 00 00 00 00 38 3a ff fe 80 00 00 00 00 00 00 00 00 00 00 00 00 00 02 ff 02 00\n> ^\n> \n> Fix this by marking the ip6_header struct as QEMU_PACKED, the way we\n> have done to handle similar problems involving tcp_header, ip_header,\n> etc.\n> \n> Signed-off-by: Peter Maydell \n> ---\n\nQueued via hw-misc, thanks.","headers":{"Return-Path":"","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=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=QJfmfp8s;\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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