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Wed, 19 Nov 2025 13:23:30 GMT Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A8D9420040; Wed, 19 Nov 2025 13:23:30 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2B6C820043; Wed, 19 Nov 2025 13:23:30 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 19 Nov 2025 13:23:30 +0000 (GMT) From: Jens Remus To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org, Steven Rostedt Cc: Jens Remus , Josh Poimboeuf , Masami Hiramatsu , Mathieu Desnoyers , Peter Zijlstra , Ingo Molnar , Jiri Olsa , Arnaldo Carvalho de Melo , Namhyung Kim , Thomas Gleixner , Andrii Nakryiko , Indu Bhagat , "Jose E. Marchesi" , Beau Belgrave , Linus Torvalds , Andrew Morton , Florian Weimer , Kees Cook , "Carlos O'Donell" , Sam James , Dylan Hatch , Borislav Petkov , Dave Hansen , David Hildenbrand , "H. Peter Anvin" , "Liam R. Howlett" , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Suren Baghdasaryan , Vlastimil Babka , Heiko Carstens , Vasily Gorbik Subject: [PATCH v12 08/13] unwind_user/sframe: Add support for outermost frame indication Date: Wed, 19 Nov 2025 14:23:18 +0100 Message-ID: <20251119132323.1281768-9-jremus@linux.ibm.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20251119132323.1281768-1-jremus@linux.ibm.com> References: <20251119132323.1281768-1-jremus@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=BanVE7t2 c=1 sm=1 tr=0 ts=691dc4d8 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=6UeiqGixMTsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=7d_E57ReAAAA:8 a=JfrnYn6hAAAA:8 a=yPCof4ZbAAAA:8 a=mDV3o1hIAAAA:8 a=yMhMjlubAAAA:8 a=VnNF1IyMAAAA:8 a=Z4Rwk6OoAAAA:8 a=20KFwNOVAAAA:8 a=7mOBRU54AAAA:8 a=mFg4y33aAicYmUfzDuoA:9 a=jhqOcbufqs7Y1TYCrUUU:22 a=1CNFftbPRP8L7MoqJWF3:22 a=HkZW87K1Qel5hWWM3VKY:22 a=wa9RWnbW_A1YIeRBVszw:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTE1MDAzMiBTYWx0ZWRfX0sYAbp2epTJF KwK0o6nV/t/DascHTDAw7LjrSVRelVjU3PChgqNTnUIqNBrR65oSm2XirXhGaq6SmWYXiF9l1o1 BsQhZw9XMFA3APgLGsAzpWdBL5le73BMdkqHwRiBZKgzAka4TyoQ/V6rFSBgo/dSBXgg9LHtznx NdSbabmEonNwBeP4+PV83lwjZMVwR3jfTZTot0Q0bfvhGMA/Z5R0bX++6shrDi2fEkjT1foBBry b+KgQFanPYjh8tQz0YZsoGAsl3XtdIOuJVvRNk5bDVDcwgny0eibC0knYxhDsdUTo5WHxOJwFNT /PwBeGNB/s/bKHBUxF9TtHWloEtkba+Ln2E9Lu+Peanpoy1GCtSZ3uKnat4AHyISNzxApfJNd6v w4n5s2CWsuTbBxxsa84qbBd6dq6cDQ== X-Proofpoint-GUID: Lc5hNVLHNPbVtLhcgANqHWlJnau4aR0p X-Proofpoint-ORIG-GUID: w_ZwY8KvewR66gHHIbtRNLPrA3VLgrnG X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-19_04,2025-11-18_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 lowpriorityscore=0 suspectscore=0 spamscore=0 impostorscore=0 priorityscore=1501 clxscore=1015 phishscore=0 bulkscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2511150032 X-Rspamd-Queue-Id: 8E87840009 X-Stat-Signature: wqu7gqoj6oq5ykddndd9qjbjjc5njrih X-Rspamd-Server: rspam02 X-Rspam-User: X-HE-Tag: 1763558677-386990 X-HE-Meta: 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 b16ges1A 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: SFrame may represent an undefined return address (RA) as SFrame FRE without any offsets as indication for an outermost frame. Cc: Steven Rostedt Cc: Josh Poimboeuf Cc: Masami Hiramatsu Cc: Mathieu Desnoyers Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Jiri Olsa Cc: Arnaldo Carvalho de Melo Cc: Namhyung Kim Cc: Thomas Gleixner Cc: Andrii Nakryiko Cc: Indu Bhagat Cc: "Jose E. Marchesi" Cc: Beau Belgrave Cc: Jens Remus Cc: Linus Torvalds Cc: Andrew Morton Cc: Florian Weimer Cc: Sam James Cc: Kees Cook Cc: "Carlos O'Donell" Signed-off-by: Jens Remus --- Notes (jremus): Changes in v11: - New patch. kernel/unwind/sframe.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/kernel/unwind/sframe.c b/kernel/unwind/sframe.c index d4ef825b1cbc..1e877c3e5417 100644 --- a/kernel/unwind/sframe.c +++ b/kernel/unwind/sframe.c @@ -33,6 +33,7 @@ struct sframe_fre_internal { s32 ra_off; s32 fp_off; u8 info; + bool ra_undefined; }; DEFINE_STATIC_SRCU(sframe_srcu); @@ -187,6 +188,7 @@ static __always_inline int __read_fre(struct sframe_section *sec, unsigned char offset_count, offset_size; s32 cfa_off, ra_off, fp_off; unsigned long cur = fre_addr; + bool ra_undefined = false; unsigned char addr_size; u32 ip_off; u8 info; @@ -205,7 +207,7 @@ static __always_inline int __read_fre(struct sframe_section *sec, UNSAFE_GET_USER_INC(info, cur, 1, Efault); offset_count = SFRAME_FRE_OFFSET_COUNT(info); offset_size = offset_size_enum_to_size(SFRAME_FRE_OFFSET_SIZE(info)); - if (!offset_count || !offset_size) + if (!offset_size) return -EFAULT; if (cur + (offset_count * offset_size) > sec->fres_end) @@ -213,6 +215,14 @@ static __always_inline int __read_fre(struct sframe_section *sec, fre->size = addr_size + 1 + (offset_count * offset_size); + if (!offset_count) { + cfa_off = 0; + ra_off = 0; + fp_off = 0; + ra_undefined = true; + goto done; + } + UNSAFE_GET_USER_INC(cfa_off, cur, offset_size, Efault); offset_count--; @@ -233,11 +243,13 @@ static __always_inline int __read_fre(struct sframe_section *sec, if (offset_count) return -EFAULT; +done: fre->ip_off = ip_off; fre->cfa_off = cfa_off; fre->ra_off = ra_off; fre->fp_off = fp_off; fre->info = info; + fre->ra_undefined = ra_undefined; return 0; @@ -298,6 +310,7 @@ static __always_inline int __find_fre(struct sframe_section *sec, frame->ra_off = fre->ra_off; frame->fp_off = fre->fp_off; frame->use_fp = SFRAME_FRE_CFA_BASE_REG_ID(fre->info) == SFRAME_BASE_REG_FP; + frame->outermost = fre->ra_undefined; return 0; } -- 2.48.1