mm, slab/slub: Ensure kmem_cache_alloc_bulk() is available early

Documentation/arm64/memory.rst

@@ -33,8 +33,8 @@ AArch64 Linux memory layout with 4KB pages + 4 levels (48-bit)::
   0000000000000000	0000ffffffffffff	 256TB		user
   ffff000000000000	ffff7fffffffffff	 128TB		kernel logical memory map
  [ffff600000000000	ffff7fffffffffff]	  32TB		[kasan shadow region]
-  ffff800000000000	ffff800007ffffff	 128MB		modules
-  ffff800008000000	fffffbffefffffff	 124TB		vmalloc
+  ffff800000000000	ffff80007fffffff	   2GB		modules
+  ffff800080000000	fffffbffefffffff	 124TB		vmalloc
   fffffbfff0000000	fffffbfffdffffff	 224MB		fixed mappings (top down)
   fffffbfffe000000	fffffbfffe7fffff	   8MB		[guard region]
   fffffbfffe800000	fffffbffff7fffff	  16MB		PCI I/O space
@@ -50,8 +50,8 @@ AArch64 Linux memory layout with 64KB pages + 3 levels (52-bit with HW support):
   0000000000000000	000fffffffffffff	   4PB		user
   fff0000000000000	ffff7fffffffffff	  ~4PB		kernel logical memory map
  [fffd800000000000	ffff7fffffffffff]	 512TB		[kasan shadow region]
-  ffff800000000000	ffff800007ffffff	 128MB		modules
-  ffff800008000000	fffffbffefffffff	 124TB		vmalloc
+  ffff800000000000	ffff80007fffffff	   2GB		modules
+  ffff800080000000	fffffbffefffffff	 124TB		vmalloc
   fffffbfff0000000	fffffbfffdffffff	 224MB		fixed mappings (top down)
   fffffbfffe000000	fffffbfffe7fffff	   8MB		[guard region]
   fffffbfffe800000	fffffbffff7fffff	  16MB		PCI I/O space

Documentation/arm64/silicon-errata.rst

@@ -172,6 +172,8 @@ stable kernels.
 +----------------+-----------------+-----------------+-----------------------------+
 | NVIDIA         | Carmel Core     | N/A             | NVIDIA_CARMEL_CNP_ERRATUM   |
 +----------------+-----------------+-----------------+-----------------------------+
+| NVIDIA         | T241 GICv3/4.x  | T241-FABRIC-4   | N/A                         |
++----------------+-----------------+-----------------+-----------------------------+
 +----------------+-----------------+-----------------+-----------------------------+
 | Freescale/NXP  | LS2080A/LS1043A | A-008585        | FSL_ERRATUM_A008585         |
 +----------------+-----------------+-----------------+-----------------------------+

Ubuntu.md

@@ -1,8 +1,8 @@
-Name:    linux
-Version: 6.1.0
-Series:  23.04 (lunar)
+Name:    linux-nvidia-6.2
+Version: 6.2.0
+Series:  22.04 (jammy)
 Description:
-    This is the source code for the Ubuntu linux kernel for the 23.04 series. This
-    source tree is used to produce the flavours: generic, generic-64k, generic-lpae.
+    This is the source code for the Ubuntu linux kernel for the 22.04 series. This
+    source tree is used to produce the flavours: nvidia, nvidia-64k.
     This kernel is configured to support the widest range of desktop, laptop and
     server configurations.

arch/arm64/Kconfig

@@ -196,6 +196,7 @@ config ARM64
 	select HAVE_IOREMAP_PROT
 	select HAVE_IRQ_TIME_ACCOUNTING
 	select HAVE_KVM
+	select HAVE_MOD_ARCH_SPECIFIC
 	select HAVE_NMI
 	select HAVE_PERF_EVENTS
 	select HAVE_PERF_REGS
@@ -552,7 +553,6 @@ config ARM64_ERRATUM_845719
 config ARM64_ERRATUM_843419
 	bool "Cortex-A53: 843419: A load or store might access an incorrect address"
 	default y
-	select ARM64_MODULE_PLTS if MODULES
 	help
 	  This option links the kernel with '--fix-cortex-a53-843419' and
 	  enables PLT support to replace certain ADRP instructions, which can
@@ -2065,26 +2065,6 @@ config ARM64_SME
 	  register state capable of holding two dimensional matrix tiles to
 	  enable various matrix operations.
 
-config ARM64_MODULE_PLTS
-	bool "Use PLTs to allow module memory to spill over into vmalloc area"
-	depends on MODULES
-	select HAVE_MOD_ARCH_SPECIFIC
-	help
-	  Allocate PLTs when loading modules so that jumps and calls whose
-	  targets are too far away for their relative offsets to be encoded
-	  in the instructions themselves can be bounced via veneers in the
-	  module's PLT. This allows modules to be allocated in the generic
-	  vmalloc area after the dedicated module memory area has been
-	  exhausted.
-
-	  When running with address space randomization (KASLR), the module
-	  region itself may be too far away for ordinary relative jumps and
-	  calls, and so in that case, module PLTs are required and cannot be
-	  disabled.
-
-	  Specific errata workaround(s) might also force module PLTs to be
-	  enabled (ARM64_ERRATUM_843419).
-
 config ARM64_PSEUDO_NMI
 	bool "Support for NMI-like interrupts"
 	select ARM_GIC_V3
@@ -2125,7 +2105,6 @@ config RELOCATABLE
 
 config RANDOMIZE_BASE
 	bool "Randomize the address of the kernel image"
-	select ARM64_MODULE_PLTS if MODULES
 	select RELOCATABLE
 	help
 	  Randomizes the virtual address at which the kernel image is
@@ -2156,9 +2135,8 @@ config RANDOMIZE_MODULE_REGION_FULL
 	  When this option is not set, the module region will be randomized over
 	  a limited range that contains the [_stext, _etext] interval of the
 	  core kernel, so branch relocations are almost always in range unless
-	  ARM64_MODULE_PLTS is enabled and the region is exhausted. In this
-	  particular case of region exhaustion, modules might be able to fall
-	  back to a larger 2GB area.
+	  the region is exhausted. In this particular case of region
+	  exhaustion, modules might be able to fall back to a larger 2GB area.
 
 config CC_HAVE_STACKPROTECTOR_SYSREG
 	def_bool $(cc-option,-mstack-protector-guard=sysreg -mstack-protector-guard-reg=sp_el0 -mstack-protector-guard-offset=0)

arch/arm64/include/asm/memory.h

@@ -46,7 +46,7 @@
 #define KIMAGE_VADDR		(MODULES_END)
 #define MODULES_END		(MODULES_VADDR + MODULES_VSIZE)
 #define MODULES_VADDR		(_PAGE_END(VA_BITS_MIN))
-#define MODULES_VSIZE		(SZ_128M)
+#define MODULES_VSIZE		(SZ_2G)
 #define VMEMMAP_START		(-(UL(1) << (VA_BITS - VMEMMAP_SHIFT)))
 #define VMEMMAP_END		(VMEMMAP_START + VMEMMAP_SIZE)
 #define PCI_IO_END		(VMEMMAP_START - SZ_8M)
@@ -180,6 +180,7 @@
 #include <linux/compiler.h>
 #include <linux/mmdebug.h>
 #include <linux/types.h>
+#include <asm/boot.h>
 #include <asm/bug.h>
 
 #if VA_BITS > 48
@@ -203,6 +204,18 @@ static inline unsigned long kaslr_offset(void)
 	return kimage_vaddr - KIMAGE_VADDR;
 }
 
+#ifdef CONFIG_RANDOMIZE_BASE
+void kaslr_init(void);
+static inline bool kaslr_enabled(void)
+{
+	extern bool __kaslr_is_enabled;
+	return __kaslr_is_enabled;
+}
+#else
+static inline void kaslr_init(void) { }
+static inline bool kaslr_enabled(void) { return false; }
+#endif
+
 /*
  * Allow all memory at the discovery stage. We will clip it later.
  */

arch/arm64/include/asm/module.h

@@ -7,7 +7,6 @@
 
 #include <asm-generic/module.h>
 
-#ifdef CONFIG_ARM64_MODULE_PLTS
 struct mod_plt_sec {
 	int			plt_shndx;
 	int			plt_num_entries;
@@ -21,7 +20,6 @@ struct mod_arch_specific {
 	/* for CONFIG_DYNAMIC_FTRACE */
 	struct plt_entry	*ftrace_trampolines;
 };
-#endif
 
 u64 module_emit_plt_entry(struct module *mod, Elf64_Shdr *sechdrs,
 			  void *loc, const Elf64_Rela *rela,
@@ -30,12 +28,6 @@ u64 module_emit_plt_entry(struct module *mod, Elf64_Shdr *sechdrs,
 u64 module_emit_veneer_for_adrp(struct module *mod, Elf64_Shdr *sechdrs,
 				void *loc, u64 val);
 
-#ifdef CONFIG_RANDOMIZE_BASE
-extern u64 module_alloc_base;
-#else
-#define module_alloc_base	((u64)_etext - MODULES_VSIZE)
-#endif
-
 struct plt_entry {
 	/*
 	 * A program that conforms to the AArch64 Procedure Call Standard

arch/arm64/include/asm/module.lds.h

@@ -1,9 +1,7 @@
 SECTIONS {
-#ifdef CONFIG_ARM64_MODULE_PLTS
 	.plt 0 : { BYTE(0) }
 	.init.plt 0 : { BYTE(0) }
 	.text.ftrace_trampoline 0 : { BYTE(0) }
-#endif
 
 #ifdef CONFIG_KASAN_SW_TAGS
 	/*

arch/arm64/kernel/Makefile

@@ -42,8 +42,7 @@ obj-$(CONFIG_COMPAT)			+= sigreturn32.o
 obj-$(CONFIG_COMPAT_ALIGNMENT_FIXUPS)	+= compat_alignment.o
 obj-$(CONFIG_KUSER_HELPERS)		+= kuser32.o
 obj-$(CONFIG_FUNCTION_TRACER)		+= ftrace.o entry-ftrace.o
-obj-$(CONFIG_MODULES)			+= module.o
-obj-$(CONFIG_ARM64_MODULE_PLTS)		+= module-plts.o
+obj-$(CONFIG_MODULES)                   += module.o module-plts.o
 obj-$(CONFIG_PERF_EVENTS)		+= perf_regs.o perf_callchain.o
 obj-$(CONFIG_HW_PERF_EVENTS)		+= perf_event.o
 obj-$(CONFIG_HAVE_HW_BREAKPOINT)	+= hw_breakpoint.o

arch/arm64/kernel/cpufeature.c

@@ -1622,7 +1622,7 @@ bool kaslr_requires_kpti(void)
 			return false;
 	}
 
-	return kaslr_offset() > 0;
+	return kaslr_enabled();
 }
 
 static bool __meltdown_safe = true;

arch/arm64/kernel/ftrace.c

@@ -107,7 +107,7 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
 
 static struct plt_entry *get_ftrace_plt(struct module *mod, unsigned long addr)
 {
-#ifdef CONFIG_ARM64_MODULE_PLTS
+#ifdef CONFIG_MODULES
 	struct plt_entry *plt = mod->arch.ftrace_trampolines;
 
 	if (addr == FTRACE_ADDR)
@@ -145,7 +145,7 @@ static bool ftrace_find_callable_addr(struct dyn_ftrace *rec,
 	 * must use a PLT to reach it. We can only place PLTs for modules, and
 	 * only when module PLT support is built-in.
 	 */
-	if (!IS_ENABLED(CONFIG_ARM64_MODULE_PLTS))
+	if (!IS_ENABLED(CONFIG_MODULES))
 		return false;
 
 	/*
@@ -249,10 +249,8 @@ int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
 	 *
 	 * Note: 'mod' is only set at module load time.
 	 */
-	if (!IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_ARGS) &&
-	    IS_ENABLED(CONFIG_ARM64_MODULE_PLTS) && mod) {
+	if (!IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_ARGS) && mod)
 		return aarch64_insn_patch_text_nosync((void *)pc, new);
-	}
 
 	if (!ftrace_find_callable_addr(rec, mod, &addr))
 		return -EINVAL;

arch/arm64/kernel/kaslr.c

@@ -4,90 +4,35 @@
  */
 
 #include <linux/cache.h>
-#include <linux/crc32.h>
 #include <linux/init.h>
-#include <linux/libfdt.h>
-#include <linux/mm_types.h>
-#include <linux/sched.h>
-#include <linux/types.h>
-#include <linux/pgtable.h>
-#include <linux/random.h>
+#include <linux/printk.h>
 
-#include <asm/fixmap.h>
-#include <asm/kernel-pgtable.h>
+#include <asm/cpufeature.h>
 #include <asm/memory.h>
-#include <asm/mmu.h>
-#include <asm/sections.h>
-#include <asm/setup.h>
 
-u64 __ro_after_init module_alloc_base;
 u16 __initdata memstart_offset_seed;
 
 struct arm64_ftr_override kaslr_feature_override __initdata;
 
-static int __init kaslr_init(void)
-{
-	u64 module_range;
-	u32 seed;
-
-	/*
-	 * Set a reasonable default for module_alloc_base in case
-	 * we end up running with module randomization disabled.
-	 */
-	module_alloc_base = (u64)_etext - MODULES_VSIZE;
+bool __ro_after_init __kaslr_is_enabled = false;
 
+void __init kaslr_init(void)
+{
 	if (kaslr_feature_override.val & kaslr_feature_override.mask & 0xf) {
 		pr_info("KASLR disabled on command line\n");
-		return 0;
-	}
-
-	if (!kaslr_offset()) {
-		pr_warn("KASLR disabled due to lack of seed\n");
-		return 0;
+		return;
 	}
 
-	pr_info("KASLR enabled\n");
-
 	/*
-	 * KASAN without KASAN_VMALLOC does not expect the module region to
-	 * intersect the vmalloc region, since shadow memory is allocated for
-	 * each module at load time, whereas the vmalloc region will already be
-	 * shadowed by KASAN zero pages.
+	 * The KASLR offset modulo MIN_KIMG_ALIGN is taken from the physical
+	 * placement of the image rather than from the seed, so a displacement
+	 * of less than MIN_KIMG_ALIGN means that no seed was provided.
 	 */
-	BUILD_BUG_ON((IS_ENABLED(CONFIG_KASAN_GENERIC) ||
-	              IS_ENABLED(CONFIG_KASAN_SW_TAGS)) &&
-		     !IS_ENABLED(CONFIG_KASAN_VMALLOC));
-
-	seed = get_random_u32();
-
-	if (IS_ENABLED(CONFIG_RANDOMIZE_MODULE_REGION_FULL)) {
-		/*
-		 * Randomize the module region over a 2 GB window covering the
-		 * kernel. This reduces the risk of modules leaking information
-		 * about the address of the kernel itself, but results in
-		 * branches between modules and the core kernel that are
-		 * resolved via PLTs. (Branches between modules will be
-		 * resolved normally.)
-		 */
-		module_range = SZ_2G - (u64)(_end - _stext);
-		module_alloc_base = max((u64)_end - SZ_2G, (u64)MODULES_VADDR);
-	} else {
-		/*
-		 * Randomize the module region by setting module_alloc_base to
-		 * a PAGE_SIZE multiple in the range [_etext - MODULES_VSIZE,
-		 * _stext) . This guarantees that the resulting region still
-		 * covers [_stext, _etext], and that all relative branches can
-		 * be resolved without veneers unless this region is exhausted
-		 * and we fall back to a larger 2GB window in module_alloc()
-		 * when ARM64_MODULE_PLTS is enabled.
-		 */
-		module_range = MODULES_VSIZE - (u64)(_etext - _stext);
+	if (kaslr_offset() < MIN_KIMG_ALIGN) {
+		pr_warn("KASLR disabled due to lack of seed\n");
+		return;
 	}
 
-	/* use the lower 21 bits to randomize the base of the module region */
-	module_alloc_base += (module_range * (seed & ((1 << 21) - 1))) >> 21;
-	module_alloc_base &= PAGE_MASK;
-
-	return 0;
+	pr_info("KASLR enabled\n");
+	__kaslr_is_enabled = true;
 }
-subsys_initcall(kaslr_init)