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Marchesi" , Beau Belgrave , Linus Torvalds , Andrew Morton , Florian Weimer , Kees Cook , "Carlos O'Donell" , Sam James , Dylan Hatch Subject: [RFC PATCH v1 2/5] unwind_user/sframe: Add support for signal frame indication Date: Tue, 27 Jan 2026 16:33:28 +0100 Message-ID: <20260127153331.2902504-3-jremus@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260127153331.2902504-1-jremus@linux.ibm.com> References: <20260127153331.2902504-1-jremus@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=Gr1PO01C c=1 sm=1 tr=0 ts=6978dad3 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=2aD4vtywDDCJo0oALMAA:9 X-Proofpoint-GUID: 7V0RLH_uAxNet9SNUFsSWHiZ3uiWnj5f X-Proofpoint-ORIG-GUID: zWvwnW9BxTrisa8ZJ1QcNz7HD8q0pL7K X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTI3MDEyNSBTYWx0ZWRfX4gj2vaKP5sGl j10QJ+t5anyfJa8nl2vSyXDe3LnULkBHEuvNVuz52n6zKXVIIFihkcEdOXrV6ANdnOHxLxuYtPc 4XLo0W5gprSAT/M9xbT3wO/fZ1HU5OyJG2e9jfQ2+QC2qgNZRuhxXYoc04pgVH9HqeGr1vMsbpE YwcvuJkl3fHQJcS1BVklp7gmSjWyck+l8mHbgEaor+eoA9jgK5Yuoj2RdahoVY5anfdKch3yCr2 8khSpefxYHhBce99Uw6yvuEX0rLrKYgwmA3rpaZiYtiR/f/TZAEkq8AcWiCNPQWiSH+913BPU1t f9DgCFOfnb2KAgxr0Gf9pSToymbo9L1/S0WJKPQJE1GW+VWs6XRFb//8VFH4Vs4M9AUZoI1Z1Fi OLOQFwkI1o3d/h1JIzzNVAVW/qvejxiII44c37yl+GrAxSIxcJw9Zc+shplUDqaZ7IozpGs3mcR zyBT2xomHdHC9uMRAGg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-01-27_03,2026-01-27_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 clxscore=1015 lowpriorityscore=0 suspectscore=0 impostorscore=0 phishscore=0 malwarescore=0 adultscore=0 spamscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2601150000 definitions=main-2601270125 Content-Type: text/plain; charset="utf-8" SFrame V3 represents the assembler directive .cfi_signal_frame using a SFrame FDE flag. Note that a SFrame FDE with this particular flag set may have no SFrame FREs. Introduce a SFRAME_V3_FDE_SIGNAL_P() helper macro. Use it in __find_fre() to populate the signal flag in struct unwind_user_frame, even if there are no FREs. Signed-off-by: Jens Remus --- kernel/unwind/sframe.c | 8 +++++++- kernel/unwind/sframe.h | 1 + 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/kernel/unwind/sframe.c b/kernel/unwind/sframe.c index 21283e3bda42..9fd2fc1572cc 100644 --- a/kernel/unwind/sframe.c +++ b/kernel/unwind/sframe.c @@ -446,6 +446,7 @@ static __always_inline int __find_fre(struct sframe_sec= tion *sec, struct unwind_user_frame *frame) { unsigned char fde_pctype =3D SFRAME_V3_FDE_PCTYPE(fde->info); + bool signal =3D SFRAME_V3_FDE_SIGNAL_P(fde->info); struct sframe_fre_internal *fre, *prev_fre =3D NULL; struct sframe_fre_internal fres[2]; unsigned long fre_addr; @@ -486,8 +487,11 @@ static __always_inline int __find_fre(struct sframe_se= ction *sec, prev_fre =3D fre; } =20 - if (!prev_fre) + if (!prev_fre) { + if (signal) + goto signal; return -EINVAL; + } fre =3D prev_fre; =20 ret =3D __read_fre_datawords(sec, fde, fre); @@ -500,6 +504,8 @@ static __always_inline int __find_fre(struct sframe_sec= tion *sec, sframe_init_rule_data(&frame->fp, fre->fp_ctl, fre->fp_off); frame->sp_off =3D SFRAME_SP_OFFSET; frame->outermost =3D SFRAME_V3_FRE_RA_UNDEFINED_P(fre->info); +signal: + frame->signal =3D signal; =20 return 0; } diff --git a/kernel/unwind/sframe.h b/kernel/unwind/sframe.h index 8a5322e95403..78432857f84c 100644 --- a/kernel/unwind/sframe.h +++ b/kernel/unwind/sframe.h @@ -65,6 +65,7 @@ struct sframe_fda_v3 { #define SFRAME_V3_FDE_FRE_TYPE(info) ((info) & 0xf) #define SFRAME_V3_FDE_PCTYPE(info) (((info) >> 4) & 0x1) #define SFRAME_V3_AARCH64_FDE_PAUTH_KEY(info) (((info) >> 5) & 0x1) +#define SFRAME_V3_FDE_SIGNAL_P(info) (((info) >> 7) & 0x1) =20 #define SFRAME_FDE_TYPE_REGULAR 0 #define SFRAME_FDE_TYPE_FLEXIBLE 1 --=20 2.51.0