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Peter Anvin" , Namhyung Kim , Andrii Nakryiko , Kees Cook , Sam James , Fangrui Song Subject: [RFC PATCH v2 16/24] unwind_user/eh_frame: Ignore DW_CFA_GNU_args_size Date: Fri, 21 Aug 2026 21:52:51 +0200 Message-ID: <20260821195259.2688377-17-jremus@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260821195259.2688377-1-jremus@linux.ibm.com> References: <20260821195259.2688377-1-jremus@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-s390@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-Authority-Analysis: v=2.4 cv=LsCiDHdc c=1 sm=1 tr=0 ts=6a88acab cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=bNYdn40op4m7Rmrl5ooA:9 X-Proofpoint-GUID: uBmxp-udTVl5WcoYm2i4owqnk8DaaQ15 X-Proofpoint-Spam-Info: AW1haW4tMjYwODIxMDE1NSBTYWx0ZWRfX/mRM2xk9j8h1 wPaUa+sIMGX/Kv+9jpvwKJ3yCpcD33FxyuNBrS/5LFdLXaxL7rLXsqR14AT+U/YwNrslSMVbnvm q6n9h16viKrhbqgewIe/sW64sbwI+9g= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODIxMDE1NSBTYWx0ZWRfXxLaSlVJu5mIK wEIrMKq9CZ1sWsiNYIymaZyS9WGDjHvRzbZMBcDMYDdPI5VTVkKA07UJY0SmT4oR7iNu7CpoIMg jYzQXQbsccQeRN1id1XIjugGUfu5s8vVFpzXN2BDPvSMdufUofs2rEHjbA0u6KIvnSJkLLMdu1h GT7dEe0E32yx9O6i3dvTAAu1AViOYNmPmOWY1ULCEXP5AI7z0fFx6Hc28cc6Xt4fvb9R/323iIY CcATHQvBLzUxjye/1TW/wCbOM5Uqnj9opGOMnfo4qa36Nn3ZKMP36TJOBtwN1ehqv0rqDjCUkAY g8WgnixvL3fEF9liMGRrGsGIEHb+V/sKuH3riRE2/qBSBQV2sKwE1XdWAfcA2ba1/o8zs9b7QVT GDGeadig5x+EFFsgO2J1fncCKFp2wgWb800EFjtcgF3C0t/wBeb1bSrSo48L7LAoNJJFIOw7ue4 kLbeG9Eh5dcF3bcArtA== X-Proofpoint-ORIG-GUID: xKmdZyASn5M0pRptJC8JiHcExZafOzkK 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=2026-08-21_06,2026-08-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 spamscore=0 priorityscore=1501 lowpriorityscore=0 bulkscore=0 adultscore=0 suspectscore=0 impostorscore=0 clxscore=1015 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608210155 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 1ac7308814a1..d185187b0c34 100644 --- a/kernel/unwind/eh_frame.c +++ b/kernel/unwind/eh_frame.c @@ -980,6 +980,17 @@ 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