The patch titled
Subject: x86/module: enable ROX caches for module text on 64 bit
has been added to the -mm mm-unstable branch. Its filename is
x86-module-enable-rox-caches-for-module-text-on-64-bit.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/x86-module-enable-rox-caches-for-module-text-on-64-bit.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Mike Rapoport (Microsoft)" <rppt@xxxxxxxxxx>
Subject: x86/module: enable ROX caches for module text on 64 bit
Date: Wed, 23 Oct 2024 19:27:11 +0300
Enable execmem's cache of PMD_SIZE'ed pages mapped as ROX for module text
allocations on 64 bit.
Link: https://lkml.kernel.org/r/20241023162711.2579610-9-rppt@xxxxxxxxxx
Signed-off-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
Reviewed-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Tested-by: kdevops <kdevops@xxxxxxxxxxxxxxx>
Cc: Andreas Larsson <andreas@xxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Cc: Brian Cain <bcain@xxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Dinh Nguyen <dinguyen@xxxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Guo Ren <guoren@xxxxxxxxxx>
Cc: Helge Deller <deller@xxxxxx>
Cc: Huacai Chen <chenhuacai@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
Cc: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>
Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Cc: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
Cc: Matt Turner <mattst88@xxxxxxxxx>
Cc: Max Filippov <jcmvbkbc@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Michal Simek <monstr@xxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Richard Weinberger <richard@xxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Song Liu <song@xxxxxxxxxx>
Cc: Stafford Horne <shorne@xxxxxxxxx>
Cc: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Cc: Vineet Gupta <vgupta@xxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/Kconfig | 1 +
arch/x86/mm/init.c | 37 ++++++++++++++++++++++++++++++++++++-
2 files changed, 37 insertions(+), 1 deletion(-)
--- a/arch/x86/Kconfig~x86-module-enable-rox-caches-for-module-text-on-64-bit
+++ a/arch/x86/Kconfig
@@ -83,6 +83,7 @@ config X86
select ARCH_HAS_DMA_OPS if GART_IOMMU || XEN
select ARCH_HAS_EARLY_DEBUG if KGDB
select ARCH_HAS_ELF_RANDOMIZE
+ select ARCH_HAS_EXECMEM_ROX if X86_64
select ARCH_HAS_FAST_MULTIPLIER
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_GCOV_PROFILE_ALL
--- a/arch/x86/mm/init.c~x86-module-enable-rox-caches-for-module-text-on-64-bit
+++ a/arch/x86/mm/init.c
@@ -1053,18 +1053,53 @@ unsigned long arch_max_swapfile_size(voi
#ifdef CONFIG_EXECMEM
static struct execmem_info execmem_info __ro_after_init;
+#ifdef CONFIG_ARCH_HAS_EXECMEM_ROX
+void execmem_fill_trapping_insns(void *ptr, size_t size, bool writeable)
+{
+ /* fill memory with INT3 instructions */
+ if (writeable)
+ memset(ptr, INT3_INSN_OPCODE, size);
+ else
+ text_poke_set(ptr, INT3_INSN_OPCODE, size);
+}
+#endif
+
struct execmem_info __init *execmem_arch_setup(void)
{
unsigned long start, offset = 0;
+ enum execmem_range_flags flags;
+ pgprot_t pgprot;
if (kaslr_enabled())
offset = get_random_u32_inclusive(1, 1024) * PAGE_SIZE;
start = MODULES_VADDR + offset;
+ if (IS_ENABLED(CONFIG_ARCH_HAS_EXECMEM_ROX)) {
+ pgprot = PAGE_KERNEL_ROX;
+ flags = EXECMEM_KASAN_SHADOW | EXECMEM_ROX_CACHE;
+ } else {
+ pgprot = PAGE_KERNEL;
+ flags = EXECMEM_KASAN_SHADOW;
+ }
+
execmem_info = (struct execmem_info){
.ranges = {
- [EXECMEM_DEFAULT] = {
+ [EXECMEM_MODULE_TEXT] = {
+ .flags = flags,
+ .start = start,
+ .end = MODULES_END,
+ .pgprot = pgprot,
+ .alignment = MODULE_ALIGN,
+ },
+ [EXECMEM_KPROBES ... EXECMEM_BPF] = {
+ .flags = EXECMEM_KASAN_SHADOW,
+ .start = start,
+ .end = MODULES_END,
+ .pgprot = PAGE_KERNEL,
+ .alignment = MODULE_ALIGN,
+ },
+ [EXECMEM_MODULE_DATA] = {
.flags = EXECMEM_KASAN_SHADOW,
.start = start,
.end = MODULES_END,
_
Patches currently in -mm which might be from rppt@xxxxxxxxxx are
mm-kmemleak-fix-typo-in-object_no_scan-comment.patch
mm-vmalloc-group-declarations-depending-on-config_mmu-together.patch
mm-vmalloc-dont-account-for-number-of-nodes-for-huge_vmap-allocations.patch
asm-generic-introduce-text-patchingh.patch
module-prepare-to-handle-rox-allocations-for-text.patch
arch-introduce-set_direct_map_valid_noflush.patch
x86-module-prepare-module-loading-for-rox-allocations-of-text.patch
execmem-add-support-for-cache-of-large-rox-pages.patch
x86-module-enable-rox-caches-for-module-text-on-64-bit.patch
