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Tue, 5 May 2026 12:17:22 +0000 (GMT) From: Jens Remus To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, x86@kernel.org, Steven Rostedt , Josh Poimboeuf , Indu Bhagat , Peter Zijlstra , Dylan Hatch , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Mathieu Desnoyers , Kees Cook , Sam James Cc: Jens Remus , bpf@vger.kernel.org, linux-mm@kvack.org, Namhyung Kim , Andrii Nakryiko , "Jose E. Marchesi" , Beau Belgrave , Florian Weimer , "Carlos O'Donell" , Masami Hiramatsu , Jiri Olsa , Arnaldo Carvalho de Melo , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Heiko Carstens , Vasily Gorbik , Ilya Leoshkevich , "Steven Rostedt (Google)" Subject: [PATCH v14 03/19] unwind_user/sframe: Store .sframe section data in per-mm maple tree Date: Tue, 5 May 2026 14:17:02 +0200 Message-ID: <20260505121718.3572346-4-jremus@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260505121718.3572346-1-jremus@linux.ibm.com> References: <20260505121718.3572346-1-jremus@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: giJmQWgdJ0WOmXNWmGSQSaFhX9DyKVaN X-Proofpoint-GUID: pEU73BEv-vlb3ri3d23VUWwQ4itBwYa_ X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTA1MDExNCBTYWx0ZWRfX0JWXrg8Ok70Q 4bSVl2U8pmcCJvSQN72e134eO7GtJ7avXnGZdECkXB6TZ0NvC2MdA1+IkrzLHcPYYKq4LWW7hod dErW9b6bkrJOyFWT1D8ZBUiP/uSLEh+R4lRDy1MwXh9o5ERI12/W9jK4zma6vv64go9JD1oFo8p 28jf92a6y6bNUOsmJvR+MYUKzks8nE0gI6MtFRp1za5qGW0e7An+/JwHQFRB4SSnmuX8bTlCg+h Pe28GQSjJQjc9YvDkT6oxwERGaGQl0FdPAnUJFRkzuFej22t0uKte2PhzLy/fVDW4jmx3TXFgkU 8IYCd/a33ZRcwAo1Jjbo7U+ANSO5EQwVf6gp7Oguv9WxnxW1+Xl64UeZatA1lJSMPpVlZxnMxUp 3FJueGTGih5fEeB7LX4lvCU+e4yerzeQM4/OEmjggMHaCmYB++V7nKEZzhkdGTSXBNcRLdfjfwX 3KS2nbcBEwR8shnN8Mg== X-Authority-Analysis: v=2.4 cv=UbFhjqSN c=1 sm=1 tr=0 ts=69f9dfd8 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VwQbUJbxAAAA:8 a=meVymXHHAAAA:8 a=pGLkceISAAAA:8 a=VnNF1IyMAAAA:8 a=Oh2dYGMcuWX8t7tWpUQA:9 a=2JgSa4NbpEOStq-L5dxp:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-05_02,2026-04-30_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1011 spamscore=0 lowpriorityscore=0 malwarescore=0 suspectscore=0 adultscore=0 priorityscore=1501 bulkscore=0 phishscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605050114 X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: E31FA10000D X-Rspam-User: X-Stat-Signature: zqfo9b7mt7atr8sdfpduefkur71tqccz X-HE-Tag: 1777984475-449351 X-HE-Meta: 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 T1s5Mpue HWnT4RrQfIEJo0dpHkNE9od68SRZYf2kD4T4yV4ltRe2M/ogLj1miTsUVXDHGGGYYwS1R65knMyfO4ZQ+Sd3tg4yiySplU31OICLaMwXpWJGnvpd/p/ApWS93WxFVv6bG2GM9I0BOc26owf2/gzasStQGPD6MAdubNoxFbCtco4TJgZS7eVYoBjuziVg21bCyRq0VdsygqN45MS4BE9HP5Bk9cGYhRGiS9KCQTPeJ2xh4u7FIYO2iidHXRgaEPP/xQYe8CYQt1f8E4EbWmttI+BnAbnCdzTRelqrXwd85nwDNaUirFkANSZWi2uR56CZHtIbQAQJWmy2GYd4HxnnwbC3uMjh4KvSmNSZ9vRij46zX++3n4fmvlXT9ZGB9A78SShB36eACH4hQKVQ= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Josh Poimboeuf Associate an .sframe section with its mm by adding it to a per-mm maple tree which is indexed by the corresponding text address range. A single .sframe section can be associated with multiple text ranges. [ Jens Remus: Minor cleanups. Reword commit subject/message. ] Signed-off-by: Josh Poimboeuf Signed-off-by: Steven Rostedt (Google) Reviewed-by: Indu Bhagat Signed-off-by: Jens Remus --- arch/x86/include/asm/mmu.h | 2 +- include/linux/mm_types.h | 3 ++ include/linux/sframe.h | 15 ++++++++++ kernel/fork.c | 10 +++++++ kernel/unwind/sframe.c | 56 ++++++++++++++++++++++++++++++++++++-- mm/init-mm.c | 2 ++ 6 files changed, 84 insertions(+), 4 deletions(-) diff --git a/arch/x86/include/asm/mmu.h b/arch/x86/include/asm/mmu.h index 0fe9c569d171..227a32899a59 100644 --- a/arch/x86/include/asm/mmu.h +++ b/arch/x86/include/asm/mmu.h @@ -87,7 +87,7 @@ typedef struct { .context = { \ .ctx_id = 1, \ .lock = __MUTEX_INITIALIZER(mm.context.lock), \ - } + }, void leave_mm(void); #define leave_mm leave_mm diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index a308e2c23b82..c1505356b6fc 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -1424,6 +1424,9 @@ struct mm_struct { #ifdef CONFIG_MM_ID mm_id_t mm_id; #endif /* CONFIG_MM_ID */ +#ifdef CONFIG_HAVE_UNWIND_USER_SFRAME + struct maple_tree sframe_mt; +#endif } __randomize_layout; /* diff --git a/include/linux/sframe.h b/include/linux/sframe.h index 0642595534f9..7ea6a97ed8af 100644 --- a/include/linux/sframe.h +++ b/include/linux/sframe.h @@ -2,6 +2,8 @@ #ifndef _LINUX_SFRAME_H #define _LINUX_SFRAME_H +#include + #ifdef CONFIG_HAVE_UNWIND_USER_SFRAME struct sframe_section { @@ -19,18 +21,31 @@ struct sframe_section { signed char fp_off; }; +#define INIT_MM_SFRAME .sframe_mt = MTREE_INIT(sframe_mt, 0), +extern void sframe_free_mm(struct mm_struct *mm); + extern int sframe_add_section(unsigned long sframe_start, unsigned long sframe_end, unsigned long text_start, unsigned long text_end); extern int sframe_remove_section(unsigned long sframe_addr); +static inline bool current_has_sframe(void) +{ + struct mm_struct *mm = current->mm; + + return mm && !mtree_empty(&mm->sframe_mt); +} + #else /* !CONFIG_HAVE_UNWIND_USER_SFRAME */ +#define INIT_MM_SFRAME +static inline void sframe_free_mm(struct mm_struct *mm) {} static inline int sframe_add_section(unsigned long sframe_start, unsigned long sframe_end, unsigned long text_start, unsigned long text_end) { return -ENOSYS; } static inline int sframe_remove_section(unsigned long sframe_addr) { return -ENOSYS; } +static inline bool current_has_sframe(void) { return false; } #endif /* CONFIG_HAVE_UNWIND_USER_SFRAME */ diff --git a/kernel/fork.c b/kernel/fork.c index 5f3fdfdb14c7..8d8195561c95 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -110,6 +110,7 @@ #include #include #include +#include #include #include @@ -735,6 +736,7 @@ void __mmdrop(struct mm_struct *mm) mm_pasid_drop(mm); mm_destroy_cid(mm); percpu_counter_destroy_many(mm->rss_stat, NR_MM_COUNTERS); + sframe_free_mm(mm); free_mm(mm); } @@ -1072,6 +1074,13 @@ static void mmap_init_lock(struct mm_struct *mm) #endif } +static void mm_init_sframe(struct mm_struct *mm) +{ +#ifdef CONFIG_HAVE_UNWIND_USER_SFRAME + mt_init(&mm->sframe_mt); +#endif +} + static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p, struct user_namespace *user_ns) { @@ -1100,6 +1109,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p, mm->pmd_huge_pte = NULL; #endif mm_init_uprobes_state(mm); + mm_init_sframe(mm); hugetlb_count_init(mm); mm_flags_clear_all(mm); diff --git a/kernel/unwind/sframe.c b/kernel/unwind/sframe.c index c128c1eeaca2..fdb2a4908563 100644 --- a/kernel/unwind/sframe.c +++ b/kernel/unwind/sframe.c @@ -81,6 +81,7 @@ static int sframe_read_header(struct sframe_section *sec) int sframe_add_section(unsigned long sframe_start, unsigned long sframe_end, unsigned long text_start, unsigned long text_end) { + struct maple_tree *sframe_mt = ¤t->mm->sframe_mt; struct vm_area_struct *sframe_vma, *text_vma; struct mm_struct *mm = current->mm; struct sframe_section *sec; @@ -122,15 +123,64 @@ int sframe_add_section(unsigned long sframe_start, unsigned long sframe_end, if (ret) goto err_free; - /* TODO nowhere to store it yet - just free it and return an error */ - ret = -ENOSYS; + ret = mtree_insert_range(sframe_mt, sec->text_start, sec->text_end, sec, GFP_KERNEL); + if (ret) { + dbg("mtree_insert_range failed: text=%lx-%lx\n", + sec->text_start, sec->text_end); + goto err_free; + } + + return 0; err_free: free_section(sec); return ret; } +static int __sframe_remove_section(struct mm_struct *mm, + struct sframe_section *sec) +{ + if (!mtree_erase(&mm->sframe_mt, sec->text_start)) { + dbg("mtree_erase failed: text=%lx\n", sec->text_start); + return -EINVAL; + } + + free_section(sec); + + return 0; +} + int sframe_remove_section(unsigned long sframe_start) { - return -ENOSYS; + struct mm_struct *mm = current->mm; + struct sframe_section *sec; + unsigned long index = 0; + bool found = false; + int ret = 0; + + mt_for_each(&mm->sframe_mt, sec, index, ULONG_MAX) { + if (sec->sframe_start == sframe_start) { + found = true; + ret |= __sframe_remove_section(mm, sec); + } + } + + if (!found || ret) + return -EINVAL; + + return 0; +} + +void sframe_free_mm(struct mm_struct *mm) +{ + struct sframe_section *sec; + unsigned long index = 0; + + if (!mm) + return; + + mt_for_each(&mm->sframe_mt, sec, index, ULONG_MAX) + free_section(sec); + + mtree_destroy(&mm->sframe_mt); } diff --git a/mm/init-mm.c b/mm/init-mm.c index c5556bb9d5f0..77909139162e 100644 --- a/mm/init-mm.c +++ b/mm/init-mm.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #ifndef INIT_MM_CONTEXT @@ -49,6 +50,7 @@ struct mm_struct init_mm = { #endif .flexible_array = MM_STRUCT_FLEXIBLE_ARRAY_INIT, INIT_MM_CONTEXT(init_mm) + INIT_MM_SFRAME }; void setup_initial_init_mm(void *start_code, void *end_code, -- 2.51.0