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Marchesi" , Beau Belgrave , Linus Torvalds , Andrew Morton , Florian Weimer , Kees Cook , "Carlos O'Donell" , Sam James , Dylan Hatch Subject: [PATCH v4 04/12] s390/vdso: Enable SFrame V3 generation in vDSO Date: Tue, 27 Jan 2026 16:19:17 +0100 Message-ID: <20260127151926.2805123-5-jremus@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260127151926.2805123-1-jremus@linux.ibm.com> References: <20260127151926.2805123-1-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-Proofpoint-GUID: lfu8Mof5g3CdoScifPWLHUtF_nYHVS_N X-Authority-Analysis: v=2.4 cv=Uptu9uwB c=1 sm=1 tr=0 ts=6978d78a cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=meVymXHHAAAA:8 a=VnNF1IyMAAAA:8 a=aCsQZq_vhc4F8yeggjQA:9 a=2JgSa4NbpEOStq-L5dxp:22 X-Proofpoint-ORIG-GUID: -C89hkHOri2E7tocAabfmdej8sBQF5UY X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTI3MDEyMSBTYWx0ZWRfX2IxyCzz44tC+ yAACqJAY2u7UsL0izW/LgMXbRI0sN5s7c31bazC2Zy9c7lcExHTr+uo4iwFNpn6ZNluFPBtd1fQ Z50ALI7znTxOElzf41kOrgAs3vmRwK3mPILuovgaZca6uQWKK2wFTzbO9iYpr5HGrRBqr5ov4yI 3qTMNu73kxRmP9gqaJgUYgjFgf/tbiY46zklPs2IiiG0xIwe6w+aqA5KL47UcI2j4qlTusB+ouu +qhKvc+aQ2NVWXGlWmqF6F3BQRXTn4i8EhFILKPzkAS5wwzhPNVMLpVB/ZCrDOzEA7+3pcdqfL/ l53yxXdN/z1DoPNzwN5vSp9eKpM7MzZy21jkS+ZCkmVOrxcPSuH/26LMo1a9vAjgUbRqi0qdQ7l UriU7lbIjib1FOcN981vq0nSzIeuUqG/WQWyPC5l+ijGmT4phUmBas0DWA+kGuIN1913hDEnUUM GR/2opxRRKzqm3yyVPQ== 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 malwarescore=0 priorityscore=1501 clxscore=1015 lowpriorityscore=0 phishscore=0 adultscore=0 impostorscore=0 bulkscore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2601150000 definitions=main-2601270121 Content-Type: text/plain; charset="utf-8" This replicates Josh's x86 patch "x86/vdso: Enable sframe generation in VDSO" [1] for s390. Test whether the assembler supports generating SFrame V3 stack trace information. Note that it is insufficient to test whether the assembler supports option --gsframe-3, as GNU assembler supports that regardless of whether it is actually capable of generating SFrame V3 stack trace information for the architecture. If so enable SFrame V3 stack trace information generation in the vDSO library so kernel and user space can unwind through it. [1]: x86/vdso: Enable sframe generation in VDSO, https://lore.kernel.org/all/20250425024023.173709192@goodmis.org/ Signed-off-by: Jens Remus --- Notes (jremus): Changes in v4: - Test for and generate SFrame V3 using assembler option --gsframe-3. =20 Changes in RFC v2: - Introduce config option AS_SFRAME instead of requiring Josh's x86 patch as pre-requisite. - Reword commit message. =20 Link to Josh's latest x86 patch: https://lore.kernel.org/all/20250425024023.173709192@goodmis.org/ arch/Kconfig | 7 +++++++ arch/s390/include/asm/dwarf.h | 4 ++++ arch/s390/kernel/vdso/Makefile | 7 ++++++- arch/s390/kernel/vdso/vdso.lds.S | 9 +++++++++ 4 files changed, 26 insertions(+), 1 deletion(-) diff --git a/arch/Kconfig b/arch/Kconfig index dcb553136e0c..b5b3a83072f7 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -479,6 +479,13 @@ config HAVE_HARDLOCKUP_DETECTOR_ARCH It uses the same command line parameters, and sysctl interface, as the generic hardlockup detectors. =20 +config AS_SFRAME + bool + +config AS_SFRAME3 + def_bool $(as-instr,.cfi_startproc\n.cfi_endproc,-Wa$(comma)--gsframe-3) + select AS_SFRAME + config UNWIND_USER bool =20 diff --git a/arch/s390/include/asm/dwarf.h b/arch/s390/include/asm/dwarf.h index 6bcf37256feb..2f148b15fd7d 100644 --- a/arch/s390/include/asm/dwarf.h +++ b/arch/s390/include/asm/dwarf.h @@ -16,7 +16,11 @@ * symbols for the .dbg file. */ =20 +#ifdef CONFIG_AS_SFRAME + .cfi_sections .eh_frame, .debug_frame, .sframe +#else .cfi_sections .eh_frame, .debug_frame +#endif =20 #define CFI_STARTPROC .cfi_startproc #define CFI_ENDPROC .cfi_endproc diff --git a/arch/s390/kernel/vdso/Makefile b/arch/s390/kernel/vdso/Makefile index 3a8bde5716f4..d604839756d0 100644 --- a/arch/s390/kernel/vdso/Makefile +++ b/arch/s390/kernel/vdso/Makefile @@ -20,7 +20,11 @@ targets :=3D $(obj-vdso) $(obj-cvdso) vdso.so vdso.so.dbg obj-vdso :=3D $(addprefix $(obj)/, $(obj-vdso)) obj-cvdso :=3D $(addprefix $(obj)/, $(obj-cvdso)) =20 -KBUILD_AFLAGS_VDSO :=3D $(KBUILD_AFLAGS) -DBUILD_VDSO +ifeq ($(CONFIG_AS_SFRAME3),y) + SFRAME_CFLAGS :=3D -Wa,--gsframe-3 +endif + +KBUILD_AFLAGS_VDSO :=3D $(KBUILD_AFLAGS) -DBUILD_VDSO $(SFRAME_CFLAGS) =20 KBUILD_CFLAGS_VDSO :=3D $(KBUILD_CFLAGS) -DBUILD_VDSO -DDISABLE_BRANCH_PRO= FILING KBUILD_CFLAGS_VDSO :=3D $(filter-out -mpacked-stack,$(KBUILD_CFLAGS_VDSO)) @@ -29,6 +33,7 @@ KBUILD_CFLAGS_VDSO :=3D $(filter-out -munaligned-symbols,= $(KBUILD_CFLAGS_VDSO)) KBUILD_CFLAGS_VDSO :=3D $(filter-out -fno-asynchronous-unwind-tables,$(KBU= ILD_CFLAGS_VDSO)) KBUILD_CFLAGS_VDSO +=3D -fPIC -fno-common -fno-builtin -fasynchronous-unwi= nd-tables KBUILD_CFLAGS_VDSO +=3D -fno-stack-protector +KBUILD_CFLAGS_VDSO +=3D $(SFRAME_CFLAGS) ldflags-y :=3D -shared -soname=3Dlinux-vdso.so.1 \ --hash-style=3Dboth --build-id=3Dsha1 -T =20 diff --git a/arch/s390/kernel/vdso/vdso.lds.S b/arch/s390/kernel/vdso/vdso.= lds.S index 7bec4de0e8e0..13d20fcede2f 100644 --- a/arch/s390/kernel/vdso/vdso.lds.S +++ b/arch/s390/kernel/vdso/vdso.lds.S @@ -51,6 +51,11 @@ SECTIONS =20 .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr .eh_frame : { KEEP (*(.eh_frame)) } :text + +#ifdef CONFIG_AS_SFRAME + .sframe : { *(.sframe) } :text :sframe +#endif + .gcc_except_table : { *(.gcc_except_table .gcc_except_table.*) } =20 .rela.dyn ALIGN(8) : { *(.rela.dyn) } @@ -77,6 +82,7 @@ SECTIONS * Very old versions of ld do not recognize this name token; use the const= ant. */ #define PT_GNU_EH_FRAME 0x6474e550 +#define PT_GNU_SFRAME 0x6474e554 =20 /* * We must supply the ELF program headers explicitly to get just one @@ -88,6 +94,9 @@ PHDRS dynamic PT_DYNAMIC FLAGS(4); /* PF_R */ note PT_NOTE FLAGS(4); /* PF_R */ eh_frame_hdr PT_GNU_EH_FRAME; +#ifdef CONFIG_AS_SFRAME + sframe PT_GNU_SFRAME; +#endif } =20 /* --=20 2.51.0