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Fri, 10 Oct 2025 15:46:26 +0000 (UTC) Received: from vschneid-thinkpadt14sgen2i.remote.csb (unknown [10.45.224.29]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 655E0180035E; Fri, 10 Oct 2025 15:46:12 +0000 (UTC) From: Valentin Schneider To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, rcu@vger.kernel.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linux-riscv@lists.infradead.org, linux-arch@vger.kernel.org, linux-trace-kernel@vger.kernel.org Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Arnaldo Carvalho de Melo , Josh Poimboeuf , Paolo Bonzini , Arnd Bergmann , Frederic Weisbecker , "Paul E. McKenney" , Jason Baron , Steven Rostedt , Ard Biesheuvel , Sami Tolvanen , "David S. Miller" , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Uladzislau Rezki , Mathieu Desnoyers , Mel Gorman , Andrew Morton , Masahiro Yamada , Han Shen , Rik van Riel , Jann Horn , Dan Carpenter , Oleg Nesterov , Juri Lelli , Clark Williams , Yair Podemsky , Marcelo Tosatti , Daniel Wagner , Petr Tesarik Subject: [PATCH v6 22/29] module: Add MOD_NOINSTR_TEXT mem_type Date: Fri, 10 Oct 2025 17:38:32 +0200 Message-ID: <20251010153839.151763-23-vschneid@redhat.com> In-Reply-To: <20251010153839.151763-1-vschneid@redhat.com> References: <20251010153839.151763-1-vschneid@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251010_164636_125931_3729CE06 X-CRM114-Status: GOOD ( 21.94 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org As pointed out by Sean [1], is_kernel_noinstr_text() will return false for an address contained within a module's .noinstr.text section. A later patch will require checking whether a text address is noinstr, and this can unfortunately be the case of modules - KVM is one such case. A module's .noinstr.text section is already tracked as of commit 66e9b0717102 ("kprobes: Prevent probes in .noinstr.text section") for kprobe blacklisting purposes, but via an ad-hoc mechanism. Add a MOD_NOINSTR_TEXT mem_type, and reorganize __layout_sections() so that it maps all the sections in a single invocation. [1]: http://lore.kernel.org/r/Z4qQL89GZ_gk0vpu@google.com Signed-off-by: Valentin Schneider --- include/linux/module.h | 6 ++-- kernel/kprobes.c | 8 ++--- kernel/module/main.c | 76 ++++++++++++++++++++++++++++++++---------- 3 files changed, 66 insertions(+), 24 deletions(-) diff --git a/include/linux/module.h b/include/linux/module.h index 3319a5269d286..825e2a072184a 100644 --- a/include/linux/module.h +++ b/include/linux/module.h @@ -314,6 +314,7 @@ struct mod_tree_node { enum mod_mem_type { MOD_TEXT = 0, + MOD_NOINSTR_TEXT, MOD_DATA, MOD_RODATA, MOD_RO_AFTER_INIT, @@ -484,8 +485,6 @@ struct module { void __percpu *percpu; unsigned int percpu_size; #endif - void *noinstr_text_start; - unsigned int noinstr_text_size; #ifdef CONFIG_TRACEPOINTS unsigned int num_tracepoints; @@ -614,12 +613,13 @@ static inline bool module_is_coming(struct module *mod) return mod->state == MODULE_STATE_COMING; } -struct module *__module_text_address(unsigned long addr); struct module *__module_address(unsigned long addr); +struct module *__module_text_address(unsigned long addr); bool is_module_address(unsigned long addr); bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr); bool is_module_percpu_address(unsigned long addr); bool is_module_text_address(unsigned long addr); +bool is_module_noinstr_text_address(unsigned long addr); static inline bool within_module_mem_type(unsigned long addr, const struct module *mod, diff --git a/kernel/kprobes.c b/kernel/kprobes.c index ab8f9fc1f0d17..d60560dddec56 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -2551,9 +2551,9 @@ static void add_module_kprobe_blacklist(struct module *mod) kprobe_add_area_blacklist(start, end); } - start = (unsigned long)mod->noinstr_text_start; + start = (unsigned long)mod->mem[MOD_NOINSTR_TEXT].base; if (start) { - end = start + mod->noinstr_text_size; + end = start + mod->mem[MOD_NOINSTR_TEXT].size; kprobe_add_area_blacklist(start, end); } } @@ -2574,9 +2574,9 @@ static void remove_module_kprobe_blacklist(struct module *mod) kprobe_remove_area_blacklist(start, end); } - start = (unsigned long)mod->noinstr_text_start; + start = (unsigned long)mod->mem[MOD_NOINSTR_TEXT].base; if (start) { - end = start + mod->noinstr_text_size; + end = start + mod->mem[MOD_NOINSTR_TEXT].size; kprobe_remove_area_blacklist(start, end); } } diff --git a/kernel/module/main.c b/kernel/module/main.c index c66b261849362..1f5bfdbb956a7 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -1653,7 +1653,17 @@ bool module_init_layout_section(const char *sname) return module_init_section(sname); } -static void __layout_sections(struct module *mod, struct load_info *info, bool is_init) +static bool module_noinstr_layout_section(const char *sname) +{ + return strstarts(sname, ".noinstr"); +} + +static bool module_default_layout_section(const char *sname) +{ + return !module_init_layout_section(sname) && !module_noinstr_layout_section(sname); +} + +static void __layout_sections(struct module *mod, struct load_info *info) { unsigned int m, i; @@ -1662,20 +1672,44 @@ static void __layout_sections(struct module *mod, struct load_info *info, bool i * Mask of excluded section header flags } */ static const unsigned long masks[][2] = { + /* Core */ + { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, + { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, + { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, + { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, + { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, + { ARCH_SHF_SMALL | SHF_ALLOC, 0 }, + /* Init */ { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, - { ARCH_SHF_SMALL | SHF_ALLOC, 0 } + { ARCH_SHF_SMALL | SHF_ALLOC, 0 }, }; - static const int core_m_to_mem_type[] = { + static bool (*const section_filter[])(const char *) = { + /* Core */ + module_default_layout_section, + module_noinstr_layout_section, + module_default_layout_section, + module_default_layout_section, + module_default_layout_section, + module_default_layout_section, + /* Init */ + module_init_layout_section, + module_init_layout_section, + module_init_layout_section, + module_init_layout_section, + module_init_layout_section, + }; + static const int mem_type_map[] = { + /* Core */ MOD_TEXT, + MOD_NOINSTR_TEXT, MOD_RODATA, MOD_RO_AFTER_INIT, MOD_DATA, MOD_DATA, - }; - static const int init_m_to_mem_type[] = { + /* Init */ MOD_INIT_TEXT, MOD_INIT_RODATA, MOD_INVALID, @@ -1684,16 +1718,16 @@ static void __layout_sections(struct module *mod, struct load_info *info, bool i }; for (m = 0; m < ARRAY_SIZE(masks); ++m) { - enum mod_mem_type type = is_init ? init_m_to_mem_type[m] : core_m_to_mem_type[m]; + enum mod_mem_type type = mem_type_map[m]; for (i = 0; i < info->hdr->e_shnum; ++i) { Elf_Shdr *s = &info->sechdrs[i]; const char *sname = info->secstrings + s->sh_name; - if ((s->sh_flags & masks[m][0]) != masks[m][0] - || (s->sh_flags & masks[m][1]) - || s->sh_entsize != ~0UL - || is_init != module_init_layout_section(sname)) + if ((s->sh_flags & masks[m][0]) != masks[m][0] || + (s->sh_flags & masks[m][1]) || + s->sh_entsize != ~0UL || + !section_filter[m](sname)) continue; if (WARN_ON_ONCE(type == MOD_INVALID)) @@ -1733,10 +1767,7 @@ static void layout_sections(struct module *mod, struct load_info *info) info->sechdrs[i].sh_entsize = ~0UL; pr_debug("Core section allocation order for %s:\n", mod->name); - __layout_sections(mod, info, false); - - pr_debug("Init section allocation order for %s:\n", mod->name); - __layout_sections(mod, info, true); + __layout_sections(mod, info); } static void module_license_taint_check(struct module *mod, const char *license) @@ -2625,9 +2656,6 @@ static int find_module_sections(struct module *mod, struct load_info *info) } #endif - mod->noinstr_text_start = section_objs(info, ".noinstr.text", 1, - &mod->noinstr_text_size); - #ifdef CONFIG_TRACEPOINTS mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", sizeof(*mod->tracepoints_ptrs), @@ -3872,12 +3900,26 @@ struct module *__module_text_address(unsigned long addr) if (mod) { /* Make sure it's within the text section. */ if (!within_module_mem_type(addr, mod, MOD_TEXT) && + !within_module_mem_type(addr, mod, MOD_NOINSTR_TEXT) && !within_module_mem_type(addr, mod, MOD_INIT_TEXT)) mod = NULL; } return mod; } +bool is_module_noinstr_text_address(unsigned long addr) +{ + scoped_guard(preempt) { + struct module *mod = __module_address(addr); + + /* Make sure it's within the .noinstr.text section. */ + if (mod) + return within_module_mem_type(addr, mod, MOD_NOINSTR_TEXT); + } + + return false; +} + /* Don't grab lock, we're oopsing. */ void print_modules(void) { -- 2.51.0