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GET /api/1.0/patches/2196702/?format=api
{ "id": 2196702, "url": "http://patchwork.ozlabs.org/api/1.0/patches/2196702/?format=api", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/1.0/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/" }, "msgid": "<20260216065639.1750181-3-hbathini@linux.ibm.com>", "date": "2026-02-16T06:56:36", "name": "[2/5] powerpc64/bpf: fix the address returned by bpf_get_func_ip", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": false, "hash": "7ad2bfd93858c9e425f983e3bc6778745880d11b", "submitter": { "id": 74073, "url": "http://patchwork.ozlabs.org/api/1.0/people/74073/?format=api", "name": "Hari Bathini", "email": "hbathini@linux.ibm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260216065639.1750181-3-hbathini@linux.ibm.com/mbox/", "series": [ { "id": 492248, "url": "http://patchwork.ozlabs.org/api/1.0/series/492248/?format=api", "date": "2026-02-16T06:56:34", "name": "powerpc64/bpf: various fixes", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/492248/mbox/" } ], "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2196702/checks/", "tags": {}, "headers": { "Return-Path": "\n <linuxppc-dev+bounces-16870-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.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=n7nHu35x;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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lists.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=linux.ibm.com;\n dkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=n7nHu35x; dkim-atps=neutral;\n spf=pass (client-ip=148.163.158.5; helo=mx0b-001b2d01.pphosted.com;\n envelope-from=hbathini@linux.ibm.com;\n receiver=lists.ozlabs.org) smtp.mailfrom=linux.ibm.com", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc\n\t:content-transfer-encoding:date:from:in-reply-to:message-id\n\t:mime-version:references:subject:to; s=pp1; bh=2XX0R9TtZrIBWJXgK\n\tI/YKmAKnVgu8iZtTRCdZ43Gui4=; b=n7nHu35xIL5ZnNFc/5bSfc6UbN66tO7eK\n\tIweFt55+6LEEwtg5NYjkKp20mKSQSQBl0dgUQlYV/SYUDcnvPxq3ftJv2LOEx1XS\n\tVWgrhmNnA79Y+23nw3mhIcHVEmW0lRprZtS43SUfhZTpqVZTzaJHt1ZYZa2yweP9\n\t44v4876zeIPMbCZnCQraAqglkJ4tlW6Xv0A2ErIyU2nhaDoqohqaXZJiictgHf+9\n\tib5L8ezOhoYjgy+heD02q6KgieJHc3CpyGAY2j3yGb0jVdKu54+zOX/8f3/xFwmm\n\ttRIRdVuiGh1Oxr/tYZOWPInRAhdkPTrtYQ3zuKCOG61lZ/NpBta7A==", "From": "Hari Bathini <hbathini@linux.ibm.com>", "To": "linuxppc-dev <linuxppc-dev@lists.ozlabs.org>", "Cc": "bpf@vger.kernel.org, Alexei Starovoitov <ast@kernel.org>,\n Daniel Borkmann <daniel@iogearbox.net>,\n Andrii Nakryiko <andrii@kernel.org>,\n Saket Kumar Bhaskar <skb99@linux.ibm.com>,\n Abhishek Dubey <adubey@linux.ibm.com>, stable@vger.kernel.org", "Subject": "[PATCH 2/5] powerpc64/bpf: fix the address returned by\n bpf_get_func_ip", "Date": "Mon, 16 Feb 2026 12:26:36 +0530", "Message-ID": "<20260216065639.1750181-3-hbathini@linux.ibm.com>", "X-Mailer": "git-send-email 2.53.0", "In-Reply-To": "<20260216065639.1750181-1-hbathini@linux.ibm.com>", "References": "<20260216065639.1750181-1-hbathini@linux.ibm.com>", "X-Mailing-List": "linuxppc-dev@lists.ozlabs.org", "List-Id": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "Precedence": "list", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-TM-AS-GCONF": "00", "X-Proofpoint-ORIG-GUID": "s-Hs2wh5xqKazuuC3CIC-OGV1YGxtEXq", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwMjE2MDA1NCBTYWx0ZWRfX63se1cveZzgM\n adpG9gnLyx8a1l3IPGVCzPPhPbGd4cuiYT0LV0oUgR819E3PkTD2c0M0Q6cKDUogZ7FIPHh788h\n iTQGQik3kDTKPR7D+hJhbavfJ7rGhy2oBsKOEB+sB4epnzdbHFraTV3zaYRl2KK1bnm2gpYaM55\n si3QErh080PMCdwIqn/JwWUQb27G185ZJIHmLLMMMDUW39YDZHeM8fqTpDMQO5L97+8WXtFKVQ1\n BW6qLQXaBBuXVT5ZulLa0ePG2T3FbNsrRrZ7w/UEJ5/a6kn6vg4HiZHrlcvVbLnJMJenmRvmIv2\n rNuaJBeY1f4WUn8le1RXMjS3b8/9I5gzSGjBpM6/8I6F+6+jIlsjS9q3fQudfnOj2hyzkA1j54Q\n pbvnWivLXH5OxzK+F6iMnr+wkci4CM/7rzHCFaK/gEzIkZ6j7tMc8FTVPZPT7NBXaR6DD+w1/X5\n On6+qgQYb2IEGVgzQ1w==", "X-Proofpoint-GUID": "s-Hs2wh5xqKazuuC3CIC-OGV1YGxtEXq", "X-Authority-Analysis": "v=2.4 cv=U+mfzOru c=1 sm=1 tr=0 ts=6992bfb2 cx=c_pps\n a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17\n a=HzLeVaNsDn8A:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22\n a=GgsMoib0sEa3-_RKJdDe:22 a=VnNF1IyMAAAA:8 a=VwQbUJbxAAAA:8\n a=SO5buJ7TJInmnl-hmdUA:9", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-02-16_03,2026-02-13_01,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n clxscore=1011 bulkscore=0 impostorscore=0 malwarescore=0 spamscore=0\n adultscore=0 phishscore=0 lowpriorityscore=0 priorityscore=1501\n suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc=\n route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000\n definitions=main-2602160054", "X-Spam-Status": "No, score=-0.7 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tRCVD_IN_DNSWL_LOW,RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,\n\tSPF_PASS autolearn=disabled version=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "bpf_get_func_ip() helper function returns the address of the traced\nfunction. It relies on the IP address stored at ctx - 16 by the bpf\ntrampoline. On 64-bit powerpc, this address is recovered from LR\naccounting for OOL trampoline. But the address stored here was off\nby 4-bytes. Ensure the address is the actual start of the traced\nfunction.\n\nReported-by: Abhishek Dubey <adubey@linux.ibm.com>\nFixes: d243b62b7bd3 (\"powerpc64/bpf: Add support for bpf trampolines\")\nCc: stable@vger.kernel.org\nSigned-off-by: Hari Bathini <hbathini@linux.ibm.com>\n---\n arch/powerpc/net/bpf_jit_comp.c | 21 +++++++++++++--------\n 1 file changed, 13 insertions(+), 8 deletions(-)", "diff": "diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c\nindex 987cd9fb0f37..fb6cc1f832a8 100644\n--- a/arch/powerpc/net/bpf_jit_comp.c\n+++ b/arch/powerpc/net/bpf_jit_comp.c\n@@ -786,8 +786,8 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *rw_im\n \t * [ reg argN ]\n \t * [ ... ]\n \t * regs_off [ reg_arg1 ] prog ctx context\n-\t * nregs_off [ args count ]\n-\t * ip_off [ traced function ]\n+\t * nregs_off [ args count ] ((u64 *)prog_ctx)[-1]\n+\t * ip_off [ traced function ] ((u64 *)prog_ctx)[-2]\n \t * [ ... ]\n \t * run_ctx_off [ bpf_tramp_run_ctx ]\n \t * [ reg argN ]\n@@ -895,7 +895,7 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *rw_im\n \n \tbpf_trampoline_save_args(image, ctx, func_frame_offset, nr_regs, regs_off);\n \n-\t/* Save our return address */\n+\t/* Save our LR/return address */\n \tEMIT(PPC_RAW_MFLR(_R3));\n \tif (IS_ENABLED(CONFIG_PPC_FTRACE_OUT_OF_LINE))\n \t\tEMIT(PPC_RAW_STL(_R3, _R1, alt_lr_off));\n@@ -903,24 +903,29 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *rw_im\n \t\tEMIT(PPC_RAW_STL(_R3, _R1, bpf_frame_size + PPC_LR_STKOFF));\n \n \t/*\n-\t * Save ip address of the traced function.\n-\t * We could recover this from LR, but we will need to address for OOL trampoline,\n-\t * and optional GEP area.\n+\t * Get IP address of the traced function.\n+\t * In case of CONFIG_PPC_FTRACE_OUT_OF_LINE or BPF program, LR\n+\t * points to the instruction after the 'bl' instruction in the OOL stub.\n+\t * Refer to ftrace_init_ool_stub() and bpf_arch_text_poke() for OOL stub\n+\t * of kernel functions and bpf programs respectively.\n+\t * Recover kernel function/bpf program address from the unconditional\n+\t * branch instruction at the end of OOL stub.\n \t */\n \tif (IS_ENABLED(CONFIG_PPC_FTRACE_OUT_OF_LINE) || flags & BPF_TRAMP_F_IP_ARG) {\n \t\tEMIT(PPC_RAW_LWZ(_R4, _R3, 4));\n \t\tEMIT(PPC_RAW_SLWI(_R4, _R4, 6));\n \t\tEMIT(PPC_RAW_SRAWI(_R4, _R4, 6));\n \t\tEMIT(PPC_RAW_ADD(_R3, _R3, _R4));\n-\t\tEMIT(PPC_RAW_ADDI(_R3, _R3, 4));\n \t}\n \n \tif (flags & BPF_TRAMP_F_IP_ARG)\n \t\tEMIT(PPC_RAW_STL(_R3, _R1, ip_off));\n \n-\tif (IS_ENABLED(CONFIG_PPC_FTRACE_OUT_OF_LINE))\n+\tif (IS_ENABLED(CONFIG_PPC_FTRACE_OUT_OF_LINE)) {\n \t\t/* Fake our LR for unwind */\n+\t\tEMIT(PPC_RAW_ADDI(_R3, _R3, 4));\n \t\tEMIT(PPC_RAW_STL(_R3, _R1, bpf_frame_size + PPC_LR_STKOFF));\n+\t}\n \n \t/* Save function arg count -- see bpf_get_func_arg_cnt() */\n \tEMIT(PPC_RAW_LI(_R3, nr_regs));\n", "prefixes": [ "2/5" ] }