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Tue, 27 Jan 2026 15:06:03 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 623CA20040; Tue, 27 Jan 2026 15:06:03 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0412D20049; Tue, 27 Jan 2026 15:06:03 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 27 Jan 2026 15:06:02 +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 v13 16/18] unwind_user/sframe: Separate reading of FRE from reading of FRE data words Date: Tue, 27 Jan 2026 16:05:51 +0100 Message-ID: <20260127150554.2760964-17-jremus@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260127150554.2760964-1-jremus@linux.ibm.com> References: <20260127150554.2760964-1-jremus@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: SxjsYwA1yXDXlqfI_eZ-2rQJjp6_np8F X-Authority-Analysis: v=2.4 cv=Uptu9uwB c=1 sm=1 tr=0 ts=6978d461 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=vUbySO9Y5rIA: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=RXKZOtKmAAAA:8 a=DUHKQo4JlzHLUktqRlQA:9 a=jhqOcbufqs7Y1TYCrUUU:22 a=1CNFftbPRP8L7MoqJWF3:22 a=HkZW87K1Qel5hWWM3VKY:22 a=wa9RWnbW_A1YIeRBVszw:22 a=UFF3uGjEBZWolfm0k6KQ:22 X-Proofpoint-ORIG-GUID: fzlXu4Q1sRnRiPU-AXpnORpn3NNFMVir X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTI3MDEyMSBTYWx0ZWRfXzioM6+7hU7xI /sMkYBqjJzi0bM7vkEHSWbo9KtL2QDd8gA13CQ1g/fn7oG37vvxkz2HZgYEma7S/SH8b7i4JL/D lVzJUMS0vMpgCCSm3B80VcsUcSodV2B55jE1e8h3Qf3QpEYQEcSlBbfxvCR593aWqCePmrvaNcK L5EQqE6bvzcifmYvzesAQgBPOV3nIGzNn5EiLg12Ir8EQnR+99+dtDk/RW0kSOavNO9T23utAe3 LJXZjJ3Lk0kew6LdxNDSzJkSiGc9GrOZfoqnisG1wCcPgdk16KFtHoTP86tE9L+M91orCZ5DNkH TtkNHOOerZV1ULJs4wBun6htyR5h+0qnVi6vcnTlSC+M4WJVMfXyrZIdJptf3xsrBx+tdREkiAT zk6d0iKRmO4QmD6FIrHMHXM+/P/LOcLCzzC+cqc1qAgc081XX2Vjd2Cy6cabMW7iyVz7WkI7+CQ vTJlzE2hZ0jbw1o+l6A== 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 X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 5CC6CC0006 X-Stat-Signature: fuqerko1ybr76mx1cfi4yyg476o188ch X-Rspam-User: X-HE-Tag: 1769526394-276876 X-HE-Meta: U2FsdGVkX19+QzsYXELqpWnJ0bk1XBfC9UadQlnLKsbfQS6kgb+c2DDeNlTokp1uAS1VRw+F1yRFDi8MnO7w2QjtEvozrpeVyktyjz0smLLfojr++MgrichBmQybXWSnbydrmDWjnRZnYw7siEF2NibEIaxYkxkd/6xfB/nh3zk1LVTZ7hoEYwIXhgMOca+SCxaAot7Jp3IYvCCXBFvOu+GR2D81WltpT5OY6KpMf2NQG9SbHO2K0gWvwttVMmGevuOwrGTuVou2JcHGJ7CBCGNyh57AThsZ4pw7fQdWRThwfW3KhRQs42l3VhWtIQVW6ESp6LpKebWgbA4GRkEvgs3odjYt6wNpcTxGiBOk8hQqi3bmr4BqpM0tRhmLuAOjIaptveloj1SAD/SEU/Rwe5kJeY1B3cLA3jOYsSFlxzdIF+Arnvf0xeG32NuyJYchpchoB0HiGnROnxfK8z0zKMqyguz4nRFtg0NllzeqQ0ellTsr7vOw9V33x89aaOe6tCFSOsIONXs3jD5/ghby2bOQJ+uAgX3CQB00eKv2+L3VnlDdlnne51NT0mnK6kVNbpLnOXGUlmGBxz7/J5dH93ehaBlE8datW08KtG1yyXoYspEaAJlIs0ytAuxmBNRSgTW05UsQFsPK3bWMbYumlm6BnCFOko4tgCRMHfde4YAuSS3/XsarkkV+daBlONQkZIe4ud6US3rG2DhX+FKU3W6qh124qerW8iSVxK/YXeJpH9RZnxvIrY9MSDTKrs4+tyHIp/yB6JVPPX/rYUEyTHcSJ71RXjsztnKvyeV1Xco71VqxWIcOktWoJRCalyEH2vzIJia/GK45XDsw5UAIZIS3ubZ2rmMpYj1gOQdIl8ArVru/ju7n894JHFST8od1+rii8ow8eoswrpk8idixQ5x1sb7D1kAPnmoZBjMiJbGEqWir7n0pi898JU6m6HlkrhnS4B9lTpNbzOZd7gI 6XxhSjl3 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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: __find_fre() performs linear search for a matching SFrame FRE for a given IP. For that purpose it uses __read_fre(), which reads the whole FRE. That is the variable-size FRE structure as well as the trailing variable-length array of variable-size data words. For the search logic to skip over the FRE it would be sufficient to read the variable-size FRE structure only, which includes the count and size of data words. Add fields to struct sframe_fre_internal to store the FRE data word's address, count, and size. Change __read_fre() to read the variable- size FRE structure only and populate those new fields. Change __read_fre_datawords() to use those new fields. Change __find_fre() to use __read_fre_datawords() to read the FRE data words only after a matching FRE has been found. Introduce safe_read_fre_datawords() and use it in sframe_validate_section() to validate that the FRE data words. 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 v13: - New patch. kernel/unwind/sframe.c | 91 +++++++++++++++++++++++++++--------------- 1 file changed, 58 insertions(+), 33 deletions(-) diff --git a/kernel/unwind/sframe.c b/kernel/unwind/sframe.c index ebf2a2905c5c..f24997e84e05 100644 --- a/kernel/unwind/sframe.c +++ b/kernel/unwind/sframe.c @@ -39,6 +39,9 @@ struct sframe_fre_internal { u32 fp_ctl; s32 fp_off; u8 info; + unsigned long dw_addr; + unsigned char dw_count; + unsigned char dw_size; }; DEFINE_STATIC_SRCU(sframe_srcu); @@ -196,11 +199,11 @@ static __always_inline int __find_fde(struct sframe_section *sec, static __always_inline int __read_regular_fre_datawords(struct sframe_section *sec, struct sframe_fde_internal *fde, - unsigned long cur, - unsigned char dataword_count, - unsigned char dataword_size, struct sframe_fre_internal *fre) { + unsigned char dataword_count = fre->dw_count; + unsigned char dataword_size = fre->dw_size; + unsigned long cur = fre->dw_addr; s32 cfa_off, ra_off, fp_off; unsigned int cfa_regnum; @@ -242,11 +245,11 @@ __read_regular_fre_datawords(struct sframe_section *sec, static __always_inline int __read_flex_fde_fre_datawords(struct sframe_section *sec, struct sframe_fde_internal *fde, - unsigned long cur, - unsigned char dataword_count, - unsigned char dataword_size, struct sframe_fre_internal *fre) { + unsigned char dataword_count = fre->dw_count; + unsigned char dataword_size = fre->dw_size; + unsigned long cur = fre->dw_addr; u32 cfa_ctl, ra_ctl, fp_ctl; s32 cfa_off, ra_off, fp_off; @@ -303,24 +306,28 @@ __read_flex_fde_fre_datawords(struct sframe_section *sec, static __always_inline int __read_fre_datawords(struct sframe_section *sec, struct sframe_fde_internal *fde, - unsigned long cur, - unsigned char dataword_count, - unsigned char dataword_size, struct sframe_fre_internal *fre) { unsigned char fde_type = SFRAME_V3_FDE_TYPE(fde->info2); + unsigned char dataword_count = fre->dw_count; + + if (!dataword_count) { + /* A FRE without data words indicates an outermost frame. */ + fre->cfa_ctl = 0; + fre->cfa_off = 0; + fre->ra_ctl = 0; + fre->ra_off = 0; + fre->fp_ctl = 0; + fre->fp_off = 0; + + return 0; + } switch (fde_type) { case SFRAME_FDE_TYPE_REGULAR: - return __read_regular_fre_datawords(sec, fde, cur, - dataword_count, - dataword_size, - fre); + return __read_regular_fre_datawords(sec, fde, fre); case SFRAME_FDE_TYPE_FLEXIBLE: - return __read_flex_fde_fre_datawords(sec, fde, cur, - dataword_count, - dataword_size, - fre); + return __read_flex_fde_fre_datawords(sec, fde, fre); default: return -EFAULT; } @@ -362,23 +369,11 @@ static __always_inline int __read_fre(struct sframe_section *sec, fre->size = addr_size + 1 + (dataword_count * dataword_size); fre->ip_off = ip_off; fre->info = info; + fre->dw_addr = cur; + fre->dw_count = dataword_count; + fre->dw_size = dataword_size; - if (!dataword_count) { - /* - * A FRE without data words indicates RA undefined / - * outermost frame. - */ - fre->cfa_ctl = 0; - fre->cfa_off = 0; - fre->ra_ctl = 0; - fre->ra_off = 0; - fre->fp_ctl = 0; - fre->fp_off = 0; - - return 0; - } - - return __read_fre_datawords(sec, fde, cur, dataword_count, dataword_size, fre); + return 0; Efault: return -EFAULT; @@ -455,6 +450,7 @@ static __always_inline int __find_fre(struct sframe_section *sec, bool which = false; unsigned int i; u32 ip_off; + int ret; ip_off = ip - fde->func_addr; @@ -492,6 +488,10 @@ static __always_inline int __find_fre(struct sframe_section *sec, return -EINVAL; fre = prev_fre; + ret = __read_fre_datawords(sec, fde, fre); + if (ret) + return ret; + if (sframe_init_cfa_rule_data(&frame->cfa, fre->cfa_ctl, fre->cfa_off)) return -EINVAL; sframe_init_rule_data(&frame->ra, fre->ra_ctl, fre->ra_off); @@ -567,6 +567,20 @@ static int safe_read_fre(struct sframe_section *sec, return ret; } +static int safe_read_fre_datawords(struct sframe_section *sec, + struct sframe_fde_internal *fde, + struct sframe_fre_internal *fre) +{ + int ret; + + if (!user_read_access_begin((void __user *)sec->sframe_start, + sec->sframe_end - sec->sframe_start)) + return -EFAULT; + ret = __read_fre_datawords(sec, fde, fre); + user_read_access_end(); + return ret; +} + static int sframe_validate_section(struct sframe_section *sec) { unsigned long prev_ip = 0; @@ -610,6 +624,17 @@ static int sframe_validate_section(struct sframe_section *sec) fde.rep_size); return ret; } + ret = safe_read_fre_datawords(sec, &fde, fre); + if (ret) { + dbg_sec("fde %u: __read_fre_datawords(%u) failed\n", i, j); + dbg_sec("FDE: func_addr:%#lx func_size:%#x fda_off:%#x fres_off:%#x fres_num:%d info:%u info2:%u rep_size:%u\n", + fde.func_addr, fde.func_size, + fde.fda_off, + fde.fres_off, fde.fres_num, + fde.info, fde.info2, + fde.rep_size); + return ret; + } fre_addr += fre->size; -- 2.51.0