From patchwork Wed Oct 23 16:27:03 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13847488 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 918C81C9B71; Wed, 23 Oct 2024 16:27:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729700856; cv=none; b=Wb7Y8UNIIGVWekmVyMxUikp/ZBLfyj5C953ufKrijqKCqyND2GT+hvnilcFbRuIYj8++1XblR/r2gWTi3B0r3hUf5nGEaf1HQu9PYoEHV/SNNWGpQzvIY73Bb2l8cnbs1W1WPewXVkm9es6l+T9wL5IzaKyzyGRf3kJpBcO03mM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729700856; c=relaxed/simple; bh=CAUHbpciOyKyDsHwZh+qoyCOqycSY3L+pQS4jF5xUzU=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=i8gEAvS6nDUS4Au40KnQZ9ZhLdMv6lStF8QMQfFCbKHA2I1FkVXH6OVU2PF4D2rAUj6Lr78KvX1cgvuWvbaIClWKgMPBN0/bfUga8eMoRNP4ZTWsh01DcQFBdSttT4M3boY+B/9Id0UP8zH4+ydI0QRwGQHnLC431qy0ZIlCK28= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=GyRbmLCU; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="GyRbmLCU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7F44EC4CEC6; Wed, 23 Oct 2024 16:27:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729700856; bh=CAUHbpciOyKyDsHwZh+qoyCOqycSY3L+pQS4jF5xUzU=; h=From:To:Cc:Subject:Date:From; b=GyRbmLCUG9JQB3z6KOucL0zaqdZJ/z+C+hR9jVOBdBVOVN/cw4qzM9u3MGS35Y8YD dnM3cuw69OA44h4UALWLfrAtvfPlmhK05b940iXW5N7BM1bWTs+pwp1SUfgaq9q44a 2cm/u+eFE//qMgYmTjg8EyRhmgFa/JqhE6H1exzvXMS7vaPYCnHTI2amWa4VfUpKst IbDgtUU+y/WOcER10iuY4ta05P2VPLnzJhhKcicOcNlAueU033Ls3BTyu8sqvTM9pa nvsX9jSxLzIxdsSSviOh0QFGpx0rw93qMfgT2GTbnxqoAs6gxUiU5I23CuQ540ki4r tF94t/qKGqNcg== From: Mike Rapoport To: Andrew Morton , Luis Chamberlain Cc: Andreas Larsson , Andy Lutomirski , Ard Biesheuvel , Arnd Bergmann , Borislav Petkov , Brian Cain , Catalin Marinas , Christoph Hellwig , Christophe Leroy , Dave Hansen , Dinh Nguyen , Geert Uytterhoeven , Guo Ren , Helge Deller , Huacai Chen , Ingo Molnar , Johannes Berg , John Paul Adrian Glaubitz , Kent Overstreet , "Liam R. Howlett" , Mark Rutland , Masami Hiramatsu , Matt Turner , Max Filippov , Michael Ellerman , Michal Simek , Mike Rapoport , Oleg Nesterov , Palmer Dabbelt , Peter Zijlstra , Richard Weinberger , Russell King , Song Liu , Stafford Horne , Steven Rostedt , Suren Baghdasaryan , Thomas Bogendoerfer , Thomas Gleixner , Uladzislau Rezki , Vineet Gupta , Will Deacon , bpf@vger.kernel.org, linux-alpha@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-trace-kernel@vger.kernel.org, linux-um@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, sparclinux@vger.kernel.org, x86@kernel.org Subject: [PATCH v7 0/8] x86/module: use large ROX pages for text allocations Date: Wed, 23 Oct 2024 19:27:03 +0300 Message-ID: <20241023162711.2579610-1-rppt@kernel.org> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: "Mike Rapoport (Microsoft)" Hi, This is an updated version of execmem ROX caches. v6: https://lore.kernel.org/all/20241016122424.1655560-1-rppt@kernel.org * Fixed handling of alternatives for fineibt (kbuild bot) * Restored usage of text_poke_early for ftrace boot time initialization (Steve) * Made !module path in module_writable_address inline v5: https://lore.kernel.org/all/20241009180816.83591-1-rppt@kernel.org * Droped check for !area in mas_for_each() loop (Kees Bakker) * Droped externs in include/linux/vmalloc.h (Christoph) * Fixed handling of alternatives for CFI-enabled configs (Nathan) * Fixed interaction with kmemleak (Sergey). It looks like execmem and kmemleak interaction should be improved further, but it's out of scope of this series. * Added ARCH_HAS_EXECMEM_ROX configuration option to arch/Kconfig. The option serves two purposes: - make sure architecture that uses ROX caches implements execmem_fill_trapping_insns() callback (Christoph) - make sure entire physical memory is mapped in the direct map (Dave) v4: https://lore.kernel.org/all/20241007062858.44248-1-rppt@kernel.org * Fix copy/paste error in looongarch (Huacai) v3: https://lore.kernel.org/all/20240909064730.3290724-1-rppt@kernel.org * Drop ftrace_swap_func(). It is not needed because mcount array lives in a data section (Peter) * Update maple_tree usage (Liam) * Set ->fill_trapping_insns pointer on init (Ard) * Instead of using VM_FLUSH_RESET_PERMS for execmem cache, completely remove it from the direct map v2: https://lore.kernel.org/all/20240826065532.2618273-1-rppt@kernel.org * add comment why ftrace_swap_func() is needed (Steve) Since RFC: https://lore.kernel.org/all/20240411160526.2093408-1-rppt@kernel.org * update changelog about HUGE_VMAP allocations (Christophe) * move module_writable_address() from x86 to modules core (Ingo) * rename execmem_invalidate() to execmem_fill_trapping_insns() (Peter) * call alternatives_smp_unlock() after module text in-place is up to date (Nadav) = Original cover letter = These patches add support for using large ROX pages for allocations of executable memory on x86. They address Andy's comments [1] about having executable mappings for code that was not completely formed. The approach taken is to allocate ROX memory along with writable but not executable memory and use the writable copy to perform relocations and alternatives patching. After the module text gets into its final shape, the contents of the writable memory is copied into the actual ROX location using text poking. The allocations of the ROX memory use vmalloc(VMAP_ALLOW_HUGE_MAP) to allocate PMD aligned memory, fill that memory with invalid instructions and in the end remap it as ROX. Portions of these large pages are handed out to execmem_alloc() callers without any changes to the permissions. When the memory is freed with execmem_free() it is invalidated again so that it won't contain stale instructions. The module memory allocation, x86 code dealing with relocations and alternatives patching take into account the existence of the two copies, the writable memory and the ROX memory at the actual allocated virtual address. The patches are available at git: https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git/log/?h=execmem/x86-rox/v6 [1] https://lore.kernel.org/all/a17c65c6-863f-4026-9c6f-a04b659e9ab4@app.fastmail.com Mike Rapoport (Microsoft) (8): mm: vmalloc: group declarations depending on CONFIG_MMU together mm: vmalloc: don't account for number of nodes for HUGE_VMAP allocations asm-generic: introduce text-patching.h module: prepare to handle ROX allocations for text arch: introduce set_direct_map_valid_noflush() x86/module: prepare module loading for ROX allocations of text execmem: add support for cache of large ROX pages x86/module: enable ROX caches for module text on 64 bit arch/Kconfig | 8 + arch/alpha/include/asm/Kbuild | 1 + arch/arc/include/asm/Kbuild | 1 + .../include/asm/{patch.h => text-patching.h} | 0 arch/arm/kernel/ftrace.c | 2 +- arch/arm/kernel/jump_label.c | 2 +- arch/arm/kernel/kgdb.c | 2 +- arch/arm/kernel/patch.c | 2 +- arch/arm/probes/kprobes/core.c | 2 +- arch/arm/probes/kprobes/opt-arm.c | 2 +- arch/arm64/include/asm/set_memory.h | 1 + .../asm/{patching.h => text-patching.h} | 0 arch/arm64/kernel/ftrace.c | 2 +- arch/arm64/kernel/jump_label.c | 2 +- arch/arm64/kernel/kgdb.c | 2 +- arch/arm64/kernel/patching.c | 2 +- arch/arm64/kernel/probes/kprobes.c | 2 +- arch/arm64/kernel/traps.c | 2 +- arch/arm64/mm/pageattr.c | 10 + arch/arm64/net/bpf_jit_comp.c | 2 +- arch/csky/include/asm/Kbuild | 1 + arch/hexagon/include/asm/Kbuild | 1 + arch/loongarch/include/asm/Kbuild | 1 + arch/loongarch/include/asm/set_memory.h | 1 + arch/loongarch/mm/pageattr.c | 19 + arch/m68k/include/asm/Kbuild | 1 + arch/microblaze/include/asm/Kbuild | 1 + arch/mips/include/asm/Kbuild | 1 + arch/nios2/include/asm/Kbuild | 1 + arch/openrisc/include/asm/Kbuild | 1 + .../include/asm/{patch.h => text-patching.h} | 0 arch/parisc/kernel/ftrace.c | 2 +- arch/parisc/kernel/jump_label.c | 2 +- arch/parisc/kernel/kgdb.c | 2 +- arch/parisc/kernel/kprobes.c | 2 +- arch/parisc/kernel/patch.c | 2 +- arch/powerpc/include/asm/kprobes.h | 2 +- .../asm/{code-patching.h => text-patching.h} | 0 arch/powerpc/kernel/crash_dump.c | 2 +- arch/powerpc/kernel/epapr_paravirt.c | 2 +- arch/powerpc/kernel/jump_label.c | 2 +- arch/powerpc/kernel/kgdb.c | 2 +- arch/powerpc/kernel/kprobes.c | 2 +- arch/powerpc/kernel/module_32.c | 2 +- arch/powerpc/kernel/module_64.c | 2 +- arch/powerpc/kernel/optprobes.c | 2 +- arch/powerpc/kernel/process.c | 2 +- arch/powerpc/kernel/security.c | 2 +- arch/powerpc/kernel/setup_32.c | 2 +- arch/powerpc/kernel/setup_64.c | 2 +- arch/powerpc/kernel/static_call.c | 2 +- arch/powerpc/kernel/trace/ftrace.c | 2 +- arch/powerpc/kernel/trace/ftrace_64_pg.c | 2 +- arch/powerpc/lib/code-patching.c | 2 +- arch/powerpc/lib/feature-fixups.c | 2 +- arch/powerpc/lib/test-code-patching.c | 2 +- arch/powerpc/lib/test_emulate_step.c | 2 +- arch/powerpc/mm/book3s32/mmu.c | 2 +- arch/powerpc/mm/book3s64/hash_utils.c | 2 +- arch/powerpc/mm/book3s64/slb.c | 2 +- arch/powerpc/mm/kasan/init_32.c | 2 +- arch/powerpc/mm/mem.c | 2 +- arch/powerpc/mm/nohash/44x.c | 2 +- arch/powerpc/mm/nohash/book3e_pgtable.c | 2 +- arch/powerpc/mm/nohash/tlb.c | 2 +- arch/powerpc/mm/nohash/tlb_64e.c | 2 +- arch/powerpc/net/bpf_jit_comp.c | 2 +- arch/powerpc/perf/8xx-pmu.c | 2 +- arch/powerpc/perf/core-book3s.c | 2 +- arch/powerpc/platforms/85xx/smp.c | 2 +- arch/powerpc/platforms/86xx/mpc86xx_smp.c | 2 +- arch/powerpc/platforms/cell/smp.c | 2 +- arch/powerpc/platforms/powermac/smp.c | 2 +- arch/powerpc/platforms/powernv/idle.c | 2 +- arch/powerpc/platforms/powernv/smp.c | 2 +- arch/powerpc/platforms/pseries/smp.c | 2 +- arch/powerpc/xmon/xmon.c | 2 +- arch/riscv/errata/andes/errata.c | 2 +- arch/riscv/errata/sifive/errata.c | 2 +- arch/riscv/errata/thead/errata.c | 2 +- arch/riscv/include/asm/set_memory.h | 1 + .../include/asm/{patch.h => text-patching.h} | 0 arch/riscv/include/asm/uprobes.h | 2 +- arch/riscv/kernel/alternative.c | 2 +- arch/riscv/kernel/cpufeature.c | 3 +- arch/riscv/kernel/ftrace.c | 2 +- arch/riscv/kernel/jump_label.c | 2 +- arch/riscv/kernel/patch.c | 2 +- arch/riscv/kernel/probes/kprobes.c | 2 +- arch/riscv/mm/pageattr.c | 15 + arch/riscv/net/bpf_jit_comp64.c | 2 +- arch/riscv/net/bpf_jit_core.c | 2 +- arch/s390/include/asm/set_memory.h | 1 + arch/s390/mm/pageattr.c | 11 + arch/sh/include/asm/Kbuild | 1 + arch/sparc/include/asm/Kbuild | 1 + arch/um/kernel/um_arch.c | 16 +- arch/x86/Kconfig | 1 + arch/x86/entry/vdso/vma.c | 3 +- arch/x86/include/asm/alternative.h | 14 +- arch/x86/include/asm/set_memory.h | 1 + arch/x86/include/asm/text-patching.h | 1 + arch/x86/kernel/alternative.c | 181 ++++++---- arch/x86/kernel/ftrace.c | 30 +- arch/x86/kernel/module.c | 45 ++- arch/x86/mm/init.c | 37 +- arch/x86/mm/pat/set_memory.c | 8 + arch/xtensa/include/asm/Kbuild | 1 + include/asm-generic/text-patching.h | 5 + include/linux/execmem.h | 37 ++ include/linux/module.h | 16 + include/linux/moduleloader.h | 4 + include/linux/set_memory.h | 6 + include/linux/text-patching.h | 15 + include/linux/vmalloc.h | 60 ++-- kernel/module/debug_kmemleak.c | 3 +- kernel/module/main.c | 74 +++- kernel/module/strict_rwx.c | 3 + mm/execmem.c | 336 +++++++++++++++++- mm/internal.h | 1 + mm/vmalloc.c | 14 +- 121 files changed, 885 insertions(+), 247 deletions(-) rename arch/arm/include/asm/{patch.h => text-patching.h} (100%) rename arch/arm64/include/asm/{patching.h => text-patching.h} (100%) rename arch/parisc/include/asm/{patch.h => text-patching.h} (100%) rename arch/powerpc/include/asm/{code-patching.h => text-patching.h} (100%) rename arch/riscv/include/asm/{patch.h => text-patching.h} (100%) create mode 100644 include/asm-generic/text-patching.h create mode 100644 include/linux/text-patching.h base-commit: 9852d85ec9d492ebef56dc5f229416c925758edc