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Peter Anvin" , Namhyung Kim , Andrii Nakryiko , Kees Cook , Sam James Subject: [RFC PATCH v1 17/25] unwind_user/eh_frame: Ignore DW_CFA_GNU_args_size Date: Tue, 18 Aug 2026 16:49:46 +0200 Message-ID: <20260818144954.2320378-18-jremus@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260818144954.2320378-1-jremus@linux.ibm.com> References: <20260818144954.2320378-1-jremus@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: SwQbcLL-8v0RRqYKpDrR0IBRTLIR2XoW X-Authority-Analysis: v=2.4 cv=NLLlPU6g c=1 sm=1 tr=0 ts=6a847120 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=bNYdn40op4m7Rmrl5ooA:9 X-Proofpoint-Spam-Info: AW1haW4tMjYwODE4MDEwNyBTYWx0ZWRfX6ydL08lUhfqB EjVeLJLfCuseowCf9EFYGdH7HJz+Z5F7MCEH9BY/f4K5WNYjhk1/EPOuX2zr8N7v/nTOE0IimhD mMQK/bLUmGOwDVbwv6sZQhUvXr1Viu0= X-Proofpoint-ORIG-GUID: q-1xRGIh6qlvCecDcc-qrIok36DR8wqA X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODE4MDEwNyBTYWx0ZWRfX5xem2d3GoSHv 8vdSItxff8/kodM96i5JuOkTQYlz8M+0sv31UNAcU4016abpqzO4GXR6Gj+JOqdUdW3Vleyk/it 3Bo3AWMm70lN7HqL7A9vjo+ZXGa+38762lMBThD3dE09z0YeQ2H8QpT/wtfwtAdT3ONMk/ra0TK YDCb6oTcD0wIU0KBe2rLe3MMfiCXz8n9nnoP833stCN84QALFMZ8NQIDswk2tkMqZYbFqsarwor uzZRIIKhSJyX1HnCXnRelib5gn3MagwdIwjtpa3DdcnrTW/jaRxb7ttmdXkmBJCToqja7tBKnOo 2ujdg4/UhbJs5JqfA3Cm8ojYxftRt+4oSu+X2WdhfCDljaolThV0Bc/VKryViDlA7f77K72yaGw a6O7HAvQjwkGdzKstFLh48rRjhIURhxMnnzuCFTeJmKsm/SEBaqtmedmHJj6XYRx+MTyqddCub8 W483aLrJs3hOTuhll+Q== 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=2026-08-18_02,2026-08-18_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 spamscore=0 lowpriorityscore=0 phishscore=0 impostorscore=0 malwarescore=0 suspectscore=0 clxscore=1015 adultscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608180107 The DW_CFA_GNU_args_size DWARF CFI instruction is used by GCC to track the size of arguments pushed on the stack for exception handling purposes. It is not needed for stack tracing. Signed-off-by: Jens Remus --- Notes (jremus): This patch could be squashed into "unwind_user/eh_frame: Add support for reading .eh_frame section". Leaving separate for review. kernel/unwind/eh_frame.c | 11 +++++++++++ kernel/unwind/eh_frame.h | 1 + 2 files changed, 12 insertions(+) diff --git a/kernel/unwind/eh_frame.c b/kernel/unwind/eh_frame.c index ac288cec8021..64176242b7d8 100644 --- a/kernel/unwind/eh_frame.c +++ b/kernel/unwind/eh_frame.c @@ -1012,6 +1012,17 @@ static __always_inline int __do_cfi_insn(struct eh_frame_section *sec, break; } + case DW_CFA_GNU_args_size: { + unsigned long args_size; + + ret = read_uleb128(&cur, end, &args_size); + if (ret) + return ret; + + /* Ignore DW_CFA_GNU_args_size */ + break; + } + case DW_CFA_remember_state: if (ctx->stack_depth >= EH_FRAME_MAX_STATE_STACK) return -EINVAL; diff --git a/kernel/unwind/eh_frame.h b/kernel/unwind/eh_frame.h index 9a0c71102742..a43560486283 100644 --- a/kernel/unwind/eh_frame.h +++ b/kernel/unwind/eh_frame.h @@ -29,6 +29,7 @@ #define DW_CFA_val_offset 0x14 #define DW_CFA_val_offset_sf 0x15 #define DW_CFA_val_expression 0x16 +#define DW_CFA_GNU_args_size 0x2e /* Helpers for CFI opcodes */ #define DW_CFA_opcode(insn) ((insn) & 0xc0) -- 2.53.0