From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CB6A0D2F033 for ; Tue, 27 Jan 2026 15:06:34 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BB51C6B0089; Tue, 27 Jan 2026 10:06:32 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id B75706B008A; Tue, 27 Jan 2026 10:06:32 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A01F06B0092; Tue, 27 Jan 2026 10:06:32 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 6F8876B0089 for ; Tue, 27 Jan 2026 10:06:32 -0500 (EST) Received: from smtpin05.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 3AB27D2A67 for ; Tue, 27 Jan 2026 15:06:32 +0000 (UTC) X-FDA: 84378070224.05.9AF49E5 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by imf24.hostedemail.com (Postfix) with ESMTP id CEFF6180018 for ; Tue, 27 Jan 2026 15:06:29 +0000 (UTC) Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=ibm.com header.s=pp1 header.b="N/NWS0Up"; spf=pass (imf24.hostedemail.com: domain of jremus@linux.ibm.com designates 148.163.158.5 as permitted sender) smtp.mailfrom=jremus@linux.ibm.com; dmarc=pass (policy=none) header.from=ibm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1769526389; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=K+YHoKAw+cbn5wzmOqW1aWOmzk7X5v1pFB0m2mI6QO0=; b=bhSIdLt3zei203aalseBFS+Np/sONLyQOf0P8NODPvjDykn+ijgmbdK6aZAQVVDdVitfCE fV4bghFQ7jfgrTLNqp+cmWKFxSIOrCEI3pEeyUoRdqx97g8gpe2Tict+CJ3NNsHo7CrYzf b8l++gYxPJQ1EcEpqBbJHFdI7gVzkqQ= ARC-Authentication-Results: i=1; imf24.hostedemail.com; dkim=pass header.d=ibm.com header.s=pp1 header.b="N/NWS0Up"; spf=pass (imf24.hostedemail.com: domain of jremus@linux.ibm.com designates 148.163.158.5 as permitted sender) smtp.mailfrom=jremus@linux.ibm.com; dmarc=pass (policy=none) header.from=ibm.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1769526389; a=rsa-sha256; cv=none; b=MPNLi3fMdr8gWh7tmZSt3Cn5zjVBYgRnMm2voj6wN0sEgAXJ+V8Nup+heZrincEmsozfVV IAChErkwcSGyNGQSxRWYnRdw0GIfMjNG9SKgduVo0tjudgB32dk+SO/HYZfmkazzbpo8g5 33MbizkegWiDSjE9Q6mo/IoYu0RrKDE= Received: from pps.filterd (m0360072.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 60REnaOS009684; Tue, 27 Jan 2026 15:06:08 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:in-reply-to:message-id :mime-version:references:subject:to; s=pp1; bh=K+YHoKAw+cbn5wzmO qW1aWOmzk7X5v1pFB0m2mI6QO0=; b=N/NWS0UpWzXtbnLKLLp8d815C5U1hpII+ umo/IJHd9TgC6LFBl9u0ZD5vBYuPr4Q7V1jNvfKXMK0SBrcVhFUtOURKJrtdQBhU 6nCULSBUfRZ6t/Wo7b3aRSPu2WU21A/jQRSOBpXNlTwkyZL7e8XuTs+Jn+Rw9VJU CbjgN2MzGkdRUiYLLQmPUFbttIZKfvuNamEWxTHNcFszO9yfMdDerY2ukdNmInqH JPfl9TzQ9j4IH8R/v1GduTpKIRkYKsaYMuYjqE+te6laYhASQPsdbEIfeb48JNii Orm5/oWCMpxyTf6u5Z3mBCRON0P1QZsFTUMXX9Ke7voJEdIyqkHkQ== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4bvnr646r5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 27 Jan 2026 15:06:08 +0000 (GMT) Received: from m0360072.ppops.net (m0360072.ppops.net [127.0.0.1]) by pps.reinject (8.18.1.12/8.18.0.8) with ESMTP id 60RF4ZmU031466; Tue, 27 Jan 2026 15:06:07 GMT Received: from ppma13.dal12v.mail.ibm.com (dd.9e.1632.ip4.static.sl-reverse.com [50.22.158.221]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4bvnr646r1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 27 Jan 2026 15:06:07 +0000 (GMT) Received: from pps.filterd (ppma13.dal12v.mail.ibm.com [127.0.0.1]) by ppma13.dal12v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 60REgU5f023624; Tue, 27 Jan 2026 15:06:06 GMT Received: from smtprelay07.fra02v.mail.ibm.com ([9.218.2.229]) by ppma13.dal12v.mail.ibm.com (PPS) with ESMTPS id 4bwamjrwj2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 27 Jan 2026 15:06:06 +0000 Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay07.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 60RF62to50659832 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 27 Jan 2026 15:06:02 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8D84C20049; Tue, 27 Jan 2026 15:06:02 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2C4412004B; Tue, 27 Jan 2026 15:06:02 +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 14/18] unwind_user: Flexible CFA recovery rules Date: Tue, 27 Jan 2026 16:05:49 +0100 Message-ID: <20260127150554.2760964-15-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-Spam-Details-Enc: AW1haW4tMjYwMTI3MDEyMSBTYWx0ZWRfX6cfqk7mkyDnN BKp7glWyYHb2jjLh3MumiA/bplBWiqJqruQKx/swaib6JOMAVA2drXb/+Vyi3S+6FLGjOVxX2FM xkHz3fx+zxg3nXu7uGOaaGM7hHFTc/QvHaScknYs7K7VAToz7icJnCvFXw5m0ODwgOAEzFApyMc T+m+osCzvQR5WBKDMlKs3cUo9qj90aYhdysC9ZqLsmlm2sUvv3gHo/E6NaBSwqZJ8PbhDbtRqJA uryz/Blnr9l8ZvVjyQiGS4V+d/36lXMxoA166Q6o5wit1lP06QybN6vL1gNe0jJE2BzqUQbfrQk sn9kgOczbUku7vii1yXR93Fr5shX4tnhebF2v0gG1kZAKn9Spt9hVQvCWlUYrTSXnHo1v3DAk/C TJdPERjdAZ645t4Y1JnfNpISFtf7aj/7nraVvf6JQWboLnSnPANuLA11OEp8nqTuk/Kozp1yMZd tPpJORTyQew5r8ttPhA== X-Proofpoint-GUID: Vu9HWYWmyloL_Ii75PWM7aqhnZmB2Kq3 X-Proofpoint-ORIG-GUID: mYZ-0j0k0zbvHgd1DpkIZSE_XICv4fco X-Authority-Analysis: v=2.4 cv=X+Vf6WTe c=1 sm=1 tr=0 ts=6978d460 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==: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=cmUe23YjoY9pwAX-L18A:9 a=jhqOcbufqs7Y1TYCrUUU:22 a=1CNFftbPRP8L7MoqJWF3:22 a=HkZW87K1Qel5hWWM3VKY:22 a=wa9RWnbW_A1YIeRBVszw:22 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 suspectscore=0 impostorscore=0 lowpriorityscore=0 clxscore=1015 spamscore=0 adultscore=0 malwarescore=0 bulkscore=0 phishscore=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: rspam11 X-Stat-Signature: ozrkyissigmpy9gyoyf6bwpwykt56zsg X-Rspam-User: X-Rspamd-Queue-Id: CEFF6180018 X-HE-Tag: 1769526389-733723 X-HE-Meta: U2FsdGVkX1+fBaZ3f6W5YkcACcoYfmGeeYPpa2JELcaL5oKNHUkeCRc6Ngk+YqZUU7IfOlCeLnJbXDB8ik4KXFWTJq0RY/tXrXN548nj3ZS6LZe/yRdcheqT2/q1qWa7iqgThLHnK/umLPkAuTRJKWxvV10qD0WwLZoPknS77tbyu+34qzME9+VdPH/z7h1wAVfOsUaTb5Iw+f+/v6JPe0j3hRkushXV00n8gbcB9eLPRt5OmRL8jWmhz8ycJLbs65sMQfQiwv+X9XR3O5AePL+C9AeKTgDRp6swjCJRDvnuXaHfFyef4KKyilhUxRs/SvJ0+vtrvycNe2m/zx4r9BaW7ea2yZ1jCLASLeBtkkbkZHcO5L+AREDI/ELyZAKL+JL9r/Zcl3Yd8s2pXKJrGAJPp0VxHScQXlxTEhJZGNcuGVX2dkD9jIz3XSa3Cz5Gq7uGp1cSCaKFUQQr4FviMLSX7gEDa2qiJCbYs4vC2OYXykjpElp8fv/M1sxInOXvYBoB1GqQtZkXXB4fpV/Dvo8McC24ulPIxxax5qpS72vFNXiajz2Ep8V/czCvbCV9nDFsK/gToceXQw98uW8yaLSI/8IMjqE4wK5FXko/JveSLysfCVzjUjg2dTTTRL+KXdJU7eQ5/f3BfcYJ8agWlbEoROwrZsZXc4SB4J7tUabUcYZ5Fv9aUhg1M3XPcmxfPxab2XyZH/7pDh3znB1UAKpKrhp2k2Nab9ef9NLrp4AX8nbvbb9HJXoykLQ1g+38E7pxSzSaRYauJlmEeGH5I4KXG9VZ+CZhR3TPP3HSyDyC3oOuZupQfw9EvIvE6lz5SsXikGat2pEaA+a9ecJ6EbdSiV+a43atNHZuLjYrA1xEO9yd/osvN7F/OE2txZNWDsEyRAwZ2r48H7+KeSauGPHOYwAwxJiymrSIXO2mRmzcnTAR/XoLzKMIFCdG0mPK3PrxEWuMmFcCROI16cl 63/BbZru 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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: To enable support for SFrame V3 flexible FDEs with a subsequent patch, add support for the following flexible Canonical Frame Address (CFA) recovery rules: CFA = SP + offset CFA = FP + offset CFA = register + offset CFA = *(register + offset) Note that CFA recovery rules that use arbitrary register contents are only valid when in the topmost frame, as their contents are otherwise unknown. 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. arch/x86/include/asm/unwind_user.h | 12 ++++++++---- include/linux/unwind_user_types.h | 18 ++++++++++++++++-- kernel/unwind/sframe.c | 15 +++++++++++++-- kernel/unwind/user.c | 22 ++++++++++++++++++---- 4 files changed, 55 insertions(+), 12 deletions(-) diff --git a/arch/x86/include/asm/unwind_user.h b/arch/x86/include/asm/unwind_user.h index 9c3417be4283..f38f7c5ff1de 100644 --- a/arch/x86/include/asm/unwind_user.h +++ b/arch/x86/include/asm/unwind_user.h @@ -20,7 +20,10 @@ static inline int unwind_user_word_size(struct pt_regs *regs) #ifdef CONFIG_HAVE_UNWIND_USER_FP #define ARCH_INIT_USER_FP_FRAME(ws) \ - .cfa_off = 2*(ws), \ + .cfa = { \ + .rule = UNWIND_USER_CFA_RULE_FP_OFFSET,\ + .offset = 2*(ws), \ + }, \ .ra = { \ .rule = UNWIND_USER_RULE_CFA_OFFSET_DEREF,\ .offset = -1*(ws), \ @@ -29,11 +32,13 @@ static inline int unwind_user_word_size(struct pt_regs *regs) .rule = UNWIND_USER_RULE_CFA_OFFSET_DEREF,\ .offset = -2*(ws), \ }, \ - .use_fp = true, \ .outermost = false, #define ARCH_INIT_USER_FP_ENTRY_FRAME(ws) \ - .cfa_off = 1*(ws), \ + .cfa = { \ + .rule = UNWIND_USER_CFA_RULE_SP_OFFSET,\ + .offset = 1*(ws), \ + }, \ .ra = { \ .rule = UNWIND_USER_RULE_CFA_OFFSET_DEREF,\ .offset = -1*(ws), \ @@ -41,7 +46,6 @@ static inline int unwind_user_word_size(struct pt_regs *regs) .fp = { \ .rule = UNWIND_USER_RULE_RETAIN,\ }, \ - .use_fp = false, \ .outermost = false, static inline bool unwind_user_at_function_start(struct pt_regs *regs) diff --git a/include/linux/unwind_user_types.h b/include/linux/unwind_user_types.h index 0d02714a1b5d..059e5c76f2f3 100644 --- a/include/linux/unwind_user_types.h +++ b/include/linux/unwind_user_types.h @@ -29,6 +29,21 @@ struct unwind_stacktrace { #define UNWIND_USER_RULE_DEREF BIT(31) +enum unwind_user_cfa_rule { + UNWIND_USER_CFA_RULE_SP_OFFSET, /* CFA = SP + offset */ + UNWIND_USER_CFA_RULE_FP_OFFSET, /* CFA = FP + offset */ + UNWIND_USER_CFA_RULE_REG_OFFSET, /* CFA = reg + offset */ + /* DEREF variants */ + UNWIND_USER_CFA_RULE_REG_OFFSET_DEREF = /* CFA = *(reg + offset) */ + UNWIND_USER_CFA_RULE_REG_OFFSET | UNWIND_USER_RULE_DEREF, +}; + +struct unwind_user_cfa_rule_data { + enum unwind_user_cfa_rule rule; + s32 offset; + unsigned int regnum; +}; + enum unwind_user_rule { UNWIND_USER_RULE_RETAIN, /* entity = entity */ UNWIND_USER_RULE_CFA_OFFSET, /* entity = CFA + offset */ @@ -47,10 +62,9 @@ struct unwind_user_rule_data { }; struct unwind_user_frame { - s32 cfa_off; + struct unwind_user_cfa_rule_data cfa; struct unwind_user_rule_data ra; struct unwind_user_rule_data fp; - bool use_fp; bool outermost; }; diff --git a/kernel/unwind/sframe.c b/kernel/unwind/sframe.c index b5301fa9dbc8..4dfc8cf2075e 100644 --- a/kernel/unwind/sframe.c +++ b/kernel/unwind/sframe.c @@ -271,6 +271,18 @@ static __always_inline int __read_fre(struct sframe_section *sec, return -EFAULT; } +static __always_inline void +sframe_init_cfa_rule_data(struct unwind_user_cfa_rule_data *cfa_rule_data, + unsigned char fre_info, + s32 offset) +{ + if (SFRAME_V3_FRE_CFA_BASE_REG_ID(fre_info) == SFRAME_BASE_REG_FP) + cfa_rule_data->rule = UNWIND_USER_CFA_RULE_FP_OFFSET; + else + cfa_rule_data->rule = UNWIND_USER_CFA_RULE_SP_OFFSET; + cfa_rule_data->offset = offset; +} + static __always_inline void sframe_init_rule_data(struct unwind_user_rule_data *rule_data, s32 offset) @@ -332,10 +344,9 @@ static __always_inline int __find_fre(struct sframe_section *sec, return -EINVAL; fre = prev_fre; - frame->cfa_off = fre->cfa_off; + sframe_init_cfa_rule_data(&frame->cfa, fre->info, fre->cfa_off); sframe_init_rule_data(&frame->ra, fre->ra_off); sframe_init_rule_data(&frame->fp, fre->fp_off); - frame->use_fp = SFRAME_V3_FRE_CFA_BASE_REG_ID(fre->info) == SFRAME_BASE_REG_FP; frame->outermost = SFRAME_V3_FRE_RA_UNDEFINED_P(fre->info); return 0; diff --git a/kernel/unwind/user.c b/kernel/unwind/user.c index 0405922c5c0d..eb7d9489f671 100644 --- a/kernel/unwind/user.c +++ b/kernel/unwind/user.c @@ -39,14 +39,28 @@ static int unwind_user_next_common(struct unwind_user_state *state, } /* Get the Canonical Frame Address (CFA) */ - if (frame->use_fp) { + switch (frame->cfa.rule) { + case UNWIND_USER_CFA_RULE_SP_OFFSET: + cfa = state->sp; + break; + case UNWIND_USER_CFA_RULE_FP_OFFSET: if (state->fp < state->sp) return -EINVAL; cfa = state->fp; - } else { - cfa = state->sp; + break; + case UNWIND_USER_CFA_RULE_REG_OFFSET: + case UNWIND_USER_CFA_RULE_REG_OFFSET_DEREF: + if (!state->topmost || unwind_user_get_reg(&cfa, frame->cfa.regnum)) + return -EINVAL; + break; + default: + WARN_ON_ONCE(1); + return -EINVAL; } - cfa += frame->cfa_off; + cfa += frame->cfa.offset; + if (frame->cfa.rule & UNWIND_USER_RULE_DEREF && + get_user_word(&cfa, cfa, 0, state->ws)) + return -EINVAL; /* * Make sure that stack is not going in wrong direction. Allow SP -- 2.51.0