module: replace module_layout with module_memory

module_layout manages different types of memory (text, data, rodata, etc.)
in one allocation, which is problematic for some reasons:

1. It is hard to enable CONFIG_STRICT_MODULE_RWX.
2. It is hard to use huge pages in modules (and not break strict rwx).
3. Many archs uses module_layout for arch-specific data, but it is not
   obvious how these data are used (are they RO, RX, or RW?)

Improve the scenario by replacing 2 (or 3) module_layout per module with
up to 7 module_memory per module:

        MOD_TEXT,
        MOD_DATA,
        MOD_RODATA,
        MOD_RO_AFTER_INIT,
        MOD_INIT_TEXT,
        MOD_INIT_DATA,
        MOD_INIT_RODATA,

and allocating them separately. This adds slightly more entries to
mod_tree (from up to 3 entries per module, to up to 7 entries per
module). However, this at most adds a small constant overhead to
__module_address(), which is expected to be fast.

Various archs use module_layout for different data. These data are put
into different module_memory based on their location in module_layout.
IOW, data that used to go with text is allocated with MOD_MEM_TYPE_TEXT;
data that used to go with data is allocated with MOD_MEM_TYPE_DATA, etc.

module_memory simplifies quite some of the module code. For example,
ARCH_WANTS_MODULES_DATA_IN_VMALLOC is a lot cleaner, as it just uses a
different allocator for the data. kernel/module/strict_rwx.c is also
much cleaner with module_memory.

Signed-off-by: Song Liu <song@kernel.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>

18 files changed, 427 insertions, 467 deletions

diff --git a/arch/arc/kernel/unwind.c b/arch/arc/kernel/unwind.c
index 200270a94558..9270d0a713c3 100644
--- a/arch/arc/kernel/unwind.c
+++ b/arch/arc/kernel/unwind.c
@@ -369,6 +369,8 @@ void *unwind_add_table(struct module *module, const void *table_start,
 		       unsigned long table_size)
 {
 	struct unwind_table *table;
+	struct module_memory *core_text;
+	struct module_memory *init_text;
 
 	if (table_size <= 0)
 		return NULL;
@@ -377,11 +379,11 @@ void *unwind_add_table(struct module *module, const void *table_start,
 	if (!table)
 		return NULL;
 
-	init_unwind_table(table, module->name,
-			  module->core_layout.base, module->core_layout.size,
-			  module->init_layout.base, module->init_layout.size,
-			  table_start, table_size,
-			  NULL, 0);
+	core_text = &module->mem[MOD_TEXT];
+	init_text = &module->mem[MOD_INIT_TEXT];
+
+	init_unwind_table(table, module->name, core_text->base, core_text->size,
+			  init_text->base, init_text->size, table_start, table_size, NULL, 0);
 
 	init_unwind_hdr(table, unw_hdr_alloc);
 
diff --git a/arch/arm/kernel/module-plts.c b/arch/arm/kernel/module-plts.c
index af7c322ebed6..f5a43fd8c163 100644
--- a/arch/arm/kernel/module-plts.c
+++ b/arch/arm/kernel/module-plts.c
@@ -28,11 +28,6 @@ static const u32 fixed_plts[] = {
 #endif
 };
 
-static bool in_init(const struct module *mod, unsigned long loc)
-{
-	return loc - (u32)mod->init_layout.base < mod->init_layout.size;
-}
-
 static void prealloc_fixed(struct mod_plt_sec *pltsec, struct plt_entries *plt)
 {
 	int i;
@@ -50,8 +45,8 @@ static void prealloc_fixed(struct mod_plt_sec *pltsec, struct plt_entries *plt)
 
 u32 get_module_plt(struct module *mod, unsigned long loc, Elf32_Addr val)
 {
-	struct mod_plt_sec *pltsec = !in_init(mod, loc) ? &mod->arch.core :
-							  &mod->arch.init;
+	struct mod_plt_sec *pltsec = !within_module_init(loc, mod) ?
+						&mod->arch.core : &mod->arch.init;
 	struct plt_entries *plt;
 	int idx;
 
diff --git a/arch/arm64/kernel/module-plts.c b/arch/arm64/kernel/module-plts.c
index 5a0a8f552a61..543493bf924d 100644
--- a/arch/arm64/kernel/module-plts.c
+++ b/arch/arm64/kernel/module-plts.c
@@ -65,17 +65,12 @@ static bool plt_entries_equal(const struct plt_entry *a,
 	       (q + aarch64_insn_adrp_get_offset(le32_to_cpu(b->adrp)));
 }
 
-static bool in_init(const struct module *mod, void *loc)
-{
-	return (u64)loc - (u64)mod->init_layout.base < mod->init_layout.size;
-}
-
 u64 module_emit_plt_entry(struct module *mod, Elf64_Shdr *sechdrs,
 			  void *loc, const Elf64_Rela *rela,
 			  Elf64_Sym *sym)
 {
-	struct mod_plt_sec *pltsec = !in_init(mod, loc) ? &mod->arch.core :
-							  &mod->arch.init;
+	struct mod_plt_sec *pltsec = !within_module_init((unsigned long)loc, mod) ?
+						&mod->arch.core : &mod->arch.init;
 	struct plt_entry *plt = (struct plt_entry *)sechdrs[pltsec->plt_shndx].sh_addr;
 	int i = pltsec->plt_num_entries;
 	int j = i - 1;
@@ -105,8 +100,8 @@ 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)
 {
-	struct mod_plt_sec *pltsec = !in_init(mod, loc) ? &mod->arch.core :
-							  &mod->arch.init;
+	struct mod_plt_sec *pltsec = !within_module_init((unsigned long)loc, mod) ?
+						&mod->arch.core : &mod->arch.init;
 	struct plt_entry *plt = (struct plt_entry *)sechdrs[pltsec->plt_shndx].sh_addr;
 	int i = pltsec->plt_num_entries++;
 	u32 br;
diff --git a/arch/ia64/kernel/module.c b/arch/ia64/kernel/module.c
index 8f62cf97f691..3661135da9d9 100644
--- a/arch/ia64/kernel/module.c
+++ b/arch/ia64/kernel/module.c
@@ -485,19 +485,19 @@ module_frob_arch_sections (Elf_Ehdr *ehdr, Elf_Shdr *sechdrs, char *secstrings,
 	return 0;
 }
 
-static inline int
+static inline bool
 in_init (const struct module *mod, uint64_t addr)
 {
-	return addr - (uint64_t) mod->init_layout.base < mod->init_layout.size;
+	return within_module_init(addr, mod);
 }
 
-static inline int
+static inline bool
 in_core (const struct module *mod, uint64_t addr)
 {
-	return addr - (uint64_t) mod->core_layout.base < mod->core_layout.size;
+	return within_module_core(addr, mod);
 }
 
-static inline int
+static inline bool
 is_internal (const struct module *mod, uint64_t value)
 {
 	return in_init(mod, value) || in_core(mod, value);
@@ -677,7 +677,8 @@ do_reloc (struct module *mod, uint8_t r_type, Elf64_Sym *sym, uint64_t addend,
 		break;
 
 	      case RV_BDREL:
-		val -= (uint64_t) (in_init(mod, val) ? mod->init_layout.base : mod->core_layout.base);
+		val -= (uint64_t) (in_init(mod, val) ? mod->mem[MOD_INIT_TEXT].base :
+				   mod->mem[MOD_TEXT].base);
 		break;
 
 	      case RV_LTV:
@@ -812,15 +813,18 @@ apply_relocate_add (Elf64_Shdr *sechdrs, const char *strtab, unsigned int symind
 		 *     addresses have been selected...
 		 */
 		uint64_t gp;
-		if (mod->core_layout.size > MAX_LTOFF)
+		struct module_memory *mod_mem;
+
+		mod_mem = &mod->mem[MOD_DATA];
+		if (mod_mem->size > MAX_LTOFF)
 			/*
 			 * This takes advantage of fact that SHF_ARCH_SMALL gets allocated
 			 * at the end of the module.
 			 */
-			gp = mod->core_layout.size - MAX_LTOFF / 2;
+			gp = mod_mem->size - MAX_LTOFF / 2;
 		else
-			gp = mod->core_layout.size / 2;
-		gp = (uint64_t) mod->core_layout.base + ((gp + 7) & -8);
+			gp = mod_mem->size / 2;
+		gp = (uint64_t) mod_mem->base + ((gp + 7) & -8);
 		mod->arch.gp = gp;
 		DEBUGP("%s: placing gp at 0x%lx\n", __func__, gp);
 	}
diff --git a/arch/mips/kernel/vpe.c b/arch/mips/kernel/vpe.c
index 13294972707b..ab114c686f9d 100644
--- a/arch/mips/kernel/vpe.c
+++ b/arch/mips/kernel/vpe.c
@@ -199,18 +199,17 @@ static void layout_sections(struct module *mod, const Elf_Ehdr *hdr,
 	for (m = 0; m < ARRAY_SIZE(masks); ++m) {
 		for (i = 0; i < hdr->e_shnum; ++i) {
 			Elf_Shdr *s = &sechdrs[i];
+			struct module_memory *mod_mem;
+
+			mod_mem = &mod->mem[MOD_TEXT];
 
 			if ((s->sh_flags & masks[m][0]) != masks[m][0]
 			    || (s->sh_flags & masks[m][1])
 			    || s->sh_entsize != ~0UL)
 				continue;
 			s->sh_entsize =
-				get_offset((unsigned long *)&mod->core_layout.size, s);
+				get_offset((unsigned long *)&mod_mem->size, s);
 		}
-
-		if (m == 0)
-			mod->core_layout.text_size = mod->core_layout.size;
-
 	}
 }
 
@@ -641,7 +640,7 @@ static int vpe_elfload(struct vpe *v)
 		layout_sections(&mod, hdr, sechdrs, secstrings);
 	}
 
-	v->load_addr = alloc_progmem(mod.core_layout.size);
+	v->load_addr = alloc_progmem(mod.mod_mem[MOD_TEXT].size);
 	if (!v->load_addr)
 		return -ENOMEM;
 
diff --git a/arch/parisc/kernel/module.c b/arch/parisc/kernel/module.c
index 7df140545b22..f6e38c4d3904 100644
--- a/arch/parisc/kernel/module.c
+++ b/arch/parisc/kernel/module.c
@@ -27,9 +27,9 @@
  *      We are not doing SEGREL32 handling correctly. According to the ABI, we
  *      should do a value offset, like this:
  *			if (in_init(me, (void *)val))
- *				val -= (uint32_t)me->init_layout.base;
+ *				val -= (uint32_t)me->mem[MOD_INIT_TEXT].base;
  *			else
- *				val -= (uint32_t)me->core_layout.base;
+ *				val -= (uint32_t)me->mem[MOD_TEXT].base;
  *	However, SEGREL32 is used only for PARISC unwind entries, and we want
  *	those entries to have an absolute address, and not just an offset.
  *
@@ -76,25 +76,6 @@
  * allows us to allocate up to 4095 GOT entries. */
 #define MAX_GOTS	4095
 
-/* three functions to determine where in the module core
- * or init pieces the location is */
-static inline int in_init(struct module *me, void *loc)
-{
-	return (loc >= me->init_layout.base &&
-		loc <= (me->init_layout.base + me->init_layout.size));
-}
-
-static inline int in_core(struct module *me, void *loc)
-{
-	return (loc >= me->core_layout.base &&
-		loc <= (me->core_layout.base + me->core_layout.size));
-}
-
-static inline int in_local(struct module *me, void *loc)
-{
-	return in_init(me, loc) || in_core(me, loc);
-}
-
 #ifndef CONFIG_64BIT
 struct got_entry {
 	Elf32_Addr addr;
@@ -302,6 +283,7 @@ int module_frob_arch_sections(CONST Elf_Ehdr *hdr,
 {
 	unsigned long gots = 0, fdescs = 0, len;
 	unsigned int i;
+	struct module_memory *mod_mem;
 
 	len = hdr->e_shnum * sizeof(me->arch.section[0]);
 	me->arch.section = kzalloc(len, GFP_KERNEL);
@@ -346,14 +328,15 @@ int module_frob_arch_sections(CONST Elf_Ehdr *hdr,
 		me->arch.section[s].stub_entries += count;
 	}
 
+	mod_mem = &me->mem[MOD_TEXT];
 	/* align things a bit */
-	me->core_layout.size = ALIGN(me->core_layout.size, 16);
-	me->arch.got_offset = me->core_layout.size;
-	me->core_layout.size += gots * sizeof(struct got_entry);
+	mod_mem->size = ALIGN(mod_mem->size, 16);
+	me->arch.got_offset = mod_mem->size;
+	mod_mem->size += gots * sizeof(struct got_entry);
 
-	me->core_layout.size = ALIGN(me->core_layout.size, 16);
-	me->arch.fdesc_offset = me->core_layout.size;
-	me->core_layout.size += fdescs * sizeof(Elf_Fdesc);
+	mod_mem->size = ALIGN(mod_mem->size, 16);
+	me->arch.fdesc_offset = mod_mem->size;
+	mod_mem->size += fdescs * sizeof(Elf_Fdesc);
 
 	me->arch.got_max = gots;
 	me->arch.fdesc_max = fdescs;
@@ -371,7 +354,7 @@ static Elf64_Word get_got(struct module *me, unsigned long value, long addend)
 
 	BUG_ON(value == 0);
 
-	got = me->core_layout.base + me->arch.got_offset;
+	got = me->mem[MOD_TEXT].base + me->arch.got_offset;
 	for (i = 0; got[i].addr; i++)
 		if (got[i].addr == value)
 			goto out;
@@ -389,7 +372,7 @@ static Elf64_Word get_got(struct module *me, unsigned long value, long addend)
 #ifdef CONFIG_64BIT
 static Elf_Addr get_fdesc(struct module *me, unsigned long value)
 {
-	Elf_Fdesc *fdesc = me->core_layout.base + me->arch.fdesc_offset;
+	Elf_Fdesc *fdesc = me->mem[MOD_TEXT].base + me->arch.fdesc_offset;
 
 	if (!value) {
 		printk(KERN_ERR "%s: zero OPD requested!\n", me->name);
@@ -407,7 +390,7 @@ static Elf_Addr get_fdesc(struct module *me, unsigned long value)
 
 	/* Create new one */
 	fdesc->addr = value;
-	fdesc->gp = (Elf_Addr)me->core_layout.base + me->arch.got_offset;
+	fdesc->gp = (Elf_Addr)me->mem[MOD_TEXT].base + me->arch.got_offset;
 	return (Elf_Addr)fdesc;
 }
 #endif /* CONFIG_64BIT */
@@ -742,7 +725,7 @@ int apply_relocate_add(Elf_Shdr *sechdrs,
 			       loc, val);
 			val += addend;
 			/* can we reach it locally? */
-			if (in_local(me, (void *)val)) {
+			if (within_module(val, me)) {
 				/* this is the case where the symbol is local
 				 * to the module, but in a different section,
 				 * so stub the jump in case it's more than 22
@@ -801,7 +784,7 @@ int apply_relocate_add(Elf_Shdr *sechdrs,
 			break;
 		case R_PARISC_FPTR64:
 			/* 64-bit function address */
-			if(in_local(me, (void *)(val + addend))) {
+			if (within_module(val + addend, me)) {
 				*loc64 = get_fdesc(me, val+addend);
 				pr_debug("FDESC for %s at %llx points to %llx\n",
 				       strtab + sym->st_name, *loc64,
@@ -839,7 +822,7 @@ register_unwind_table(struct module *me,
 
 	table = (unsigned char *)sechdrs[me->arch.unwind_section].sh_addr;
 	end = table + sechdrs[me->arch.unwind_section].sh_size;
-	gp = (Elf_Addr)me->core_layout.base + me->arch.got_offset;
+	gp = (Elf_Addr)me->mem[MOD_TEXT].base + me->arch.got_offset;
 
 	pr_debug("register_unwind_table(), sect = %d at 0x%p - 0x%p (gp=0x%lx)\n",
 	       me->arch.unwind_section, table, end, gp);
@@ -977,7 +960,7 @@ void module_arch_cleanup(struct module *mod)
 #ifdef CONFIG_64BIT
 void *dereference_module_function_descriptor(struct module *mod, void *ptr)
 {
-	unsigned long start_opd = (Elf64_Addr)mod->core_layout.base +
+	unsigned long start_opd = (Elf64_Addr)mod->mem[MOD_TEXT].base +
 				   mod->arch.fdesc_offset;
 	unsigned long end_opd = start_opd +
 				mod->arch.fdesc_count * sizeof(Elf64_Fdesc);
diff --git a/arch/powerpc/kernel/module_32.c b/arch/powerpc/kernel/module_32.c
index ea6536171778..816a63fd71fb 100644
--- a/arch/powerpc/kernel/module_32.c
+++ b/arch/powerpc/kernel/module_32.c
@@ -163,8 +163,7 @@ static uint32_t do_plt_call(void *location,
 
 	pr_debug("Doing plt for call to 0x%x at 0x%x\n", val, (unsigned int)location);
 	/* Init, or core PLT? */
-	if (location >= mod->core_layout.base
-	    && location < mod->core_layout.base + mod->core_layout.size)
+	if (within_module_core((unsigned long)location, mod))
 		entry = (void *)sechdrs[mod->arch.core_plt_section].sh_addr;
 	else
 		entry = (void *)sechdrs[mod->arch.init_plt_section].sh_addr;
@@ -322,14 +321,14 @@ notrace int module_trampoline_target(struct module *mod, unsigned long addr,
 
 int module_finalize_ftrace(struct module *module, const Elf_Shdr *sechdrs)
 {
-	module->arch.tramp = do_plt_call(module->core_layout.base,
+	module->arch.tramp = do_plt_call(module->mem[MOD_TEXT].base,
 					 (unsigned long)ftrace_caller,
 					 sechdrs, module);
 	if (!module->arch.tramp)
 		return -ENOENT;
 
 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
-	module->arch.tramp_regs = do_plt_call(module->core_layout.base,
+	module->arch.tramp_regs = do_plt_call(module->mem[MOD_TEXT].base,
 					      (unsigned long)ftrace_regs_caller,
 					      sechdrs, module);
 	if (!module->arch.tramp_regs)
diff --git a/arch/s390/kernel/module.c b/arch/s390/kernel/module.c
index 2d159b32885b..b9dbf0c483ed 100644
--- a/arch/s390/kernel/module.c
+++ b/arch/s390/kernel/module.c
@@ -126,6 +126,7 @@ int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
 	Elf_Rela *rela;
 	char *strings;
 	int nrela, i, j;
+	struct module_memory *mod_mem;
 
 	/* Find symbol table and string table. */
 	symtab = NULL;
@@ -173,14 +174,15 @@ int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
 
 	/* Increase core size by size of got & plt and set start
 	   offsets for got and plt. */
-	me->core_layout.size = ALIGN(me->core_layout.size, 4);
-	me->arch.got_offset = me->core_layout.size;
-	me->core_layout.size += me->arch.got_size;
-	me->arch.plt_offset = me->core_layout.size;
+	mod_mem = &me->mem[MOD_TEXT];
+	mod_mem->size = ALIGN(mod_mem->size, 4);
+	me->arch.got_offset = mod_mem->size;
+	mod_mem->size += me->arch.got_size;
+	me->arch.plt_offset = mod_mem->size;
 	if (me->arch.plt_size) {
 		if (IS_ENABLED(CONFIG_EXPOLINE) && !nospec_disable)
 			me->arch.plt_size += PLT_ENTRY_SIZE;
-		me->core_layout.size += me->arch.plt_size;
+		mod_mem->size += me->arch.plt_size;
 	}
 	return 0;
 }
@@ -304,7 +306,7 @@ static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab,
 	case R_390_GOTPLT64:	/* 64 bit offset to jump slot.	*/
 	case R_390_GOTPLTENT:	/* 32 bit rel. offset to jump slot >> 1. */
 		if (info->got_initialized == 0) {
-			Elf_Addr *gotent = me->core_layout.base +
+			Elf_Addr *gotent = me->mem[MOD_TEXT].base +
 					   me->arch.got_offset +
 					   info->got_offset;
 
@@ -329,7 +331,7 @@ static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab,
 			rc = apply_rela_bits(loc, val, 0, 64, 0, write);
 		else if (r_type == R_390_GOTENT ||
 			 r_type == R_390_GOTPLTENT) {
-			val += (Elf_Addr) me->core_layout.base - loc;
+			val += (Elf_Addr) me->mem[MOD_TEXT].base - loc;
 			rc = apply_rela_bits(loc, val, 1, 32, 1, write);
 		}
 		break;
@@ -345,7 +347,7 @@ static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab,
 			char *plt_base;
 			char *ip;
 
-			plt_base = me->core_layout.base + me->arch.plt_offset;
+			plt_base = me->mem[MOD_TEXT].base + me->arch.plt_offset;
 			ip = plt_base + info->plt_offset;
 			*(int *)insn = 0x0d10e310;	/* basr 1,0  */
 			*(int *)&insn[4] = 0x100c0004;	/* lg	1,12(1) */
@@ -375,7 +377,7 @@ static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab,
 			       val - loc + 0xffffUL < 0x1ffffeUL) ||
 			      (r_type == R_390_PLT32DBL &&
 			       val - loc + 0xffffffffULL < 0x1fffffffeULL)))
-				val = (Elf_Addr) me->core_layout.base +
+				val = (Elf_Addr) me->mem[MOD_TEXT].base +
 					me->arch.plt_offset +
 					info->plt_offset;
 			val += rela->r_addend - loc;
@@ -397,7 +399,7 @@ static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab,
 	case R_390_GOTOFF32:	/* 32 bit offset to GOT.  */
 	case R_390_GOTOFF64:	/* 64 bit offset to GOT. */
 		val = val + rela->r_addend -
-			((Elf_Addr) me->core_layout.base + me->arch.got_offset);
+			((Elf_Addr) me->mem[MOD_TEXT].base + me->arch.got_offset);
 		if (r_type == R_390_GOTOFF16)
 			rc = apply_rela_bits(loc, val, 0, 16, 0, write);
 		else if (r_type == R_390_GOTOFF32)
@@ -407,7 +409,7 @@ static int apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab,
 		break;
 	case R_390_GOTPC:	/* 32 bit PC relative offset to GOT. */
 	case R_390_GOTPCDBL:	/* 32 bit PC rel. off. to GOT shifted by 1. */
-		val = (Elf_Addr) me->core_layout.base + me->arch.got_offset +
+		val = (Elf_Addr) me->mem[MOD_TEXT].base + me->arch.got_offset +
 			rela->r_addend - loc;
 		if (r_type == R_390_GOTPC)
 			rc = apply_rela_bits(loc, val, 1, 32, 0, write);
@@ -515,7 +517,7 @@ int module_finalize(const Elf_Ehdr *hdr,
 	    !nospec_disable && me->arch.plt_size) {
 		unsigned int *ij;
 
-		ij = me->core_layout.base + me->arch.plt_offset +
+		ij = me->mem[MOD_TEXT].base + me->arch.plt_offset +
 			me->arch.plt_size - PLT_ENTRY_SIZE;
 		ij[0] = 0xc6000000;	/* exrl	%r0,.+10	*/
 		ij[1] = 0x0005a7f4;	/* j	.		*/
diff --git a/arch/x86/kernel/callthunks.c b/arch/x86/kernel/callthunks.c
index ffea98f9064b..22ab13966427 100644
--- a/arch/x86/kernel/callthunks.c
+++ b/arch/x86/kernel/callthunks.c
@@ -330,8 +330,8 @@ void noinline callthunks_patch_module_calls(struct callthunk_sites *cs,
 					    struct module *mod)
 {
 	struct core_text ct = {
-		.base = (unsigned long)mod->core_layout.base,
-		.end  = (unsigned long)mod->core_layout.base + mod->core_layout.size,
+		.base = (unsigned long)mod->mem[MOD_TEXT].base,
+		.end  = (unsigned long)mod->mem[MOD_TEXT].base + mod->mem[MOD_TEXT].size,
 		.name = mod->name,
 	};
 
diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c
index 84ad0e61ba6e..b05f62ee2344 100644
--- a/arch/x86/kernel/module.c
+++ b/arch/x86/kernel/module.c
@@ -362,8 +362,8 @@ int module_finalize(const Elf_Ehdr *hdr,
 	}
 	if (locks) {
 		void *lseg = (void *)locks->sh_addr;
-		void *text = me->core_layout.base;
-		void *text_end = text + me->core_layout.text_size;
+		void *text = me->mem[MOD_TEXT].base;
+		void *text_end = text + me->mem[MOD_TEXT].size;
 		alternatives_smp_module_add(me, me->name,
 					    lseg, lseg + locks->sh_size,
 					    text, text_end);
diff --git a/include/linux/module.h b/include/linux/module.h
index 4435ad9439ab..c0593a96e158 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -320,17 +320,47 @@ struct mod_tree_node {
 	struct latch_tree_node node;
 };
 
-struct module_layout {
-	/* The actual code + data. */
+enum mod_mem_type {
+	MOD_TEXT = 0,
+	MOD_DATA,
+	MOD_RODATA,
+	MOD_RO_AFTER_INIT,
+	MOD_INIT_TEXT,
+	MOD_INIT_DATA,
+	MOD_INIT_RODATA,
+
+	MOD_MEM_NUM_TYPES,
+	MOD_INVALID = -1,
+};
+
+#define mod_mem_type_is_init(type)	\
+	((type) == MOD_INIT_TEXT ||	\
+	 (type) == MOD_INIT_DATA ||	\
+	 (type) == MOD_INIT_RODATA)
+
+#define mod_mem_type_is_core(type) (!mod_mem_type_is_init(type))
+
+#define mod_mem_type_is_text(type)	\
+	 ((type) == MOD_TEXT ||		\
+	  (type) == MOD_INIT_TEXT)
+
+#define mod_mem_type_is_data(type) (!mod_mem_type_is_text(type))
+
+#define mod_mem_type_is_core_data(type)	\
+	(mod_mem_type_is_core(type) &&	\
+	 mod_mem_type_is_data(type))
+
+#define for_each_mod_mem_type(type)			\
+	for (enum mod_mem_type (type) = 0;		\
+	     (type) < MOD_MEM_NUM_TYPES; (type)++)
+
+#define for_class_mod_mem_type(type, class)		\
+	for_each_mod_mem_type(type)			\
+		if (mod_mem_type_is_##class(type))
+
+struct module_memory {
 	void *base;
-	/* Total size. */
 	unsigned int size;
-	/* The size of the executable code.  */
-	unsigned int text_size;
-	/* Size of RO section of the module (text+rodata) */
-	unsigned int ro_size;
-	/* Size of RO after init section */
-	unsigned int ro_after_init_size;
 
 #ifdef CONFIG_MODULES_TREE_LOOKUP
 	struct mod_tree_node mtn;
@@ -339,9 +369,9 @@ struct module_layout {
 
 #ifdef CONFIG_MODULES_TREE_LOOKUP
 /* Only touch one cacheline for common rbtree-for-core-layout case. */
-#define __module_layout_align ____cacheline_aligned
+#define __module_memory_align ____cacheline_aligned
 #else
-#define __module_layout_align
+#define __module_memory_align
 #endif
 
 struct mod_kallsyms {
@@ -426,12 +456,7 @@ struct module {
 	/* Startup function. */
 	int (*init)(void);
 
-	/* Core layout: rbtree is accessed frequently, so keep together. */
-	struct module_layout core_layout __module_layout_align;
-	struct module_layout init_layout;
-#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
-	struct module_layout data_layout;
-#endif
+	struct module_memory mem[MOD_MEM_NUM_TYPES] __module_memory_align;
 
 	/* Arch-specific module values */
 	struct mod_arch_specific arch;
@@ -581,23 +606,35 @@ 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);
 
+static inline bool within_module_mem_type(unsigned long addr,
+					  const struct module *mod,
+					  enum mod_mem_type type)
+{
+	unsigned long base, size;
+
+	base = (unsigned long)mod->mem[type].base;
+	size = mod->mem[type].size;
+	return addr - base < size;
+}
+
 static inline bool within_module_core(unsigned long addr,
 				      const struct module *mod)
 {
-#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
-	if ((unsigned long)mod->data_layout.base <= addr &&
-	    addr < (unsigned long)mod->data_layout.base + mod->data_layout.size)
-		return true;
-#endif
-	return (unsigned long)mod->core_layout.base <= addr &&
-	       addr < (unsigned long)mod->core_layout.base + mod->core_layout.size;
+	for_class_mod_mem_type(type, core) {
+		if (within_module_mem_type(addr, mod, type))
+			return true;
+	}
+	return false;
 }
 
 static inline bool within_module_init(unsigned long addr,
 				      const struct module *mod)
 {
-	return (unsigned long)mod->init_layout.base <= addr &&
-	       addr < (unsigned long)mod->init_layout.base + mod->init_layout.size;
+	for_class_mod_mem_type(type, init) {
+		if (within_module_mem_type(addr, mod, type))
+			return true;
+	}
+	return false;
 }
 
 static inline bool within_module(unsigned long addr, const struct module *mod)
diff --git a/kernel/module/internal.h b/kernel/module/internal.h
index 2e2bf236f558..c6c44ceca07a 100644
--- a/kernel/module/internal.h
+++ b/kernel/module/internal.h
@@ -17,27 +17,19 @@
 #define ARCH_SHF_SMALL 0
 #endif
 
-/* If this is set, the section belongs in the init part of the module */
-#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG - 1))
-/* Maximum number of characters written by module_flags() */
-#define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4)
-
-#ifndef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
-#define	data_layout core_layout
-#endif
-
 /*
- * Modules' sections will be aligned on page boundaries
- * to ensure complete separation of code and data, but
- * only when CONFIG_STRICT_MODULE_RWX=y
+ * Use highest 4 bits of sh_entsize to store the mod_mem_type of this
+ * section. This leaves 28 bits for offset on 32-bit systems, which is
+ * about 256 MiB (WARN_ON_ONCE if we exceed that).
  */
-static inline unsigned int strict_align(unsigned int size)
-{
-	if (IS_ENABLED(CONFIG_STRICT_MODULE_RWX))
-		return PAGE_ALIGN(size);
-	else
-		return size;
-}
+
+#define SH_ENTSIZE_TYPE_BITS	4
+#define SH_ENTSIZE_TYPE_SHIFT	(BITS_PER_LONG - SH_ENTSIZE_TYPE_BITS)
+#define SH_ENTSIZE_TYPE_MASK	((1UL << SH_ENTSIZE_TYPE_BITS) - 1)
+#define SH_ENTSIZE_OFFSET_MASK	((1UL << (BITS_PER_LONG - SH_ENTSIZE_TYPE_BITS)) - 1)
+
+/* Maximum number of characters written by module_flags() */
+#define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4)
 
 extern struct mutex module_mutex;
 extern struct list_head modules;
@@ -101,8 +93,8 @@ int try_to_force_load(struct module *mod, const char *reason);
 bool find_symbol(struct find_symbol_arg *fsa);
 struct module *find_module_all(const char *name, size_t len, bool even_unformed);
 int cmp_name(const void *name, const void *sym);
-long module_get_offset(struct module *mod, unsigned int *size, Elf_Shdr *sechdr,
-		       unsigned int section);
+long module_get_offset_and_type(struct module *mod, enum mod_mem_type type,
+				Elf_Shdr *sechdr, unsigned int section);
 char *module_flags(struct module *mod, char *buf, bool show_state);
 size_t module_flags_taint(unsigned long taints, char *buf);
 
@@ -190,10 +182,13 @@ struct mod_tree_root {
 #endif
 	unsigned long addr_min;
 	unsigned long addr_max;
+#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
+	unsigned long data_addr_min;
+	unsigned long data_addr_max;
+#endif
 };
 
 extern struct mod_tree_root mod_tree;
-extern struct mod_tree_root mod_data_tree;
 
 #ifdef CONFIG_MODULES_TREE_LOOKUP
 void mod_tree_insert(struct module *mod);
@@ -224,7 +219,6 @@ void module_enable_nx(const struct module *mod);
 void module_enable_x(const struct module *mod);
 int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
 				char *secstrings, struct module *mod);
-bool module_check_misalignment(const struct module *mod);
 
 #ifdef CONFIG_MODULE_SIG
 int module_sig_check(struct load_info *info, int flags);
diff --git a/kernel/module/kallsyms.c b/kernel/module/kallsyms.c
index ab2376a1be88..8e89f459ffdd 100644
--- a/kernel/module/kallsyms.c
+++ b/kernel/module/kallsyms.c
@@ -78,6 +78,7 @@ static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
 			   unsigned int shnum, unsigned int pcpundx)
 {
 	const Elf_Shdr *sec;
+	enum mod_mem_type type;
 
 	if (src->st_shndx == SHN_UNDEF ||
 	    src->st_shndx >= shnum ||
@@ -90,11 +91,12 @@ static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
 #endif
 
 	sec = sechdrs + src->st_shndx;
+	type = sec->sh_entsize >> SH_ENTSIZE_TYPE_SHIFT;
 	if (!(sec->sh_flags & SHF_ALLOC)
 #ifndef CONFIG_KALLSYMS_ALL
 	    || !(sec->sh_flags & SHF_EXECINSTR)
 #endif
-	    || (sec->sh_entsize & INIT_OFFSET_MASK))
+	    || mod_mem_type_is_init(type))
 		return false;
 
 	return true;
@@ -113,11 +115,13 @@ void layout_symtab(struct module *mod, struct load_info *info)
 	Elf_Shdr *strsect = info->sechdrs + info->index.str;
 	const Elf_Sym *src;
 	unsigned int i, nsrc, ndst, strtab_size = 0;
+	struct module_memory *mod_mem_data = &mod->mem[MOD_DATA];
+	struct module_memory *mod_mem_init_data = &mod->mem[MOD_INIT_DATA];
 
 	/* Put symbol section at end of init part of module. */
 	symsect->sh_flags |= SHF_ALLOC;
-	symsect->sh_entsize = module_get_offset(mod, &mod->init_layout.size, symsect,
-						info->index.sym) | INIT_OFFSET_MASK;
+	symsect->sh_entsize = module_get_offset_and_type(mod, MOD_INIT_DATA,
+							 symsect, info->index.sym);
 	pr_debug("\t%s\n", info->secstrings + symsect->sh_name);
 
 	src = (void *)info->hdr + symsect->sh_offset;
@@ -134,28 +138,27 @@ void layout_symtab(struct module *mod, struct load_info *info)
 	}
 
 	/* Append room for core symbols at end of core part. */
-	info->symoffs = ALIGN(mod->data_layout.size, symsect->sh_addralign ?: 1);
-	info->stroffs = mod->data_layout.size = info->symoffs + ndst * sizeof(Elf_Sym);
-	mod->data_layout.size += strtab_size;
+	info->symoffs = ALIGN(mod_mem_data->size, symsect->sh_addralign ?: 1);
+	info->stroffs = mod_mem_data->size = info->symoffs + ndst * sizeof(Elf_Sym);
+	mod_mem_data->size += strtab_size;
 	/* Note add_kallsyms() computes strtab_size as core_typeoffs - stroffs */
-	info->core_typeoffs = mod->data_layout.size;
-	mod->data_layout.size += ndst * sizeof(char);
-	mod->data_layout.size = strict_align(mod->data_layout.size);
+	info->core_typeoffs = mod_mem_data->size;
+	mod_mem_data->size += ndst * sizeof(char);
 
 	/* Put string table section at end of init part of module. */
 	strsect->sh_flags |= SHF_ALLOC;
-	strsect->sh_entsize = module_get_offset(mod, &mod->init_layout.size, strsect,
-						info->index.str) | INIT_OFFSET_MASK;
+	strsect->sh_entsize = module_get_offset_and_type(mod, MOD_INIT_DATA,
+							 strsect, info->index.str);
 	pr_debug("\t%s\n", info->secstrings + strsect->sh_name);
 
 	/* We'll tack temporary mod_kallsyms on the end. */
-	mod->init_layout.size = ALIGN(mod->init_layout.size,
-				      __alignof__(struct mod_kallsyms));
-	info->mod_kallsyms_init_off = mod->init_layout.size;
-	mod->init_layout.size += sizeof(struct mod_kallsyms);
-	info->init_typeoffs = mod->init_layout.size;
-	mod->init_layout.size += nsrc * sizeof(char);
-	mod->init_layout.size = strict_align(mod->init_layout.size);
+	mod_mem_init_data->size = ALIGN(mod_mem_init_data->size,
+					__alignof__(struct mod_kallsyms));
+	info->mod_kallsyms_init_off = mod_mem_init_data->size;
+
+	mod_mem_init_data->size += sizeof(struct mod_kallsyms);
+	info->init_typeoffs = mod_mem_init_data->size;
+	mod_mem_init_data->size += nsrc * sizeof(char);
 }
 
 /*
@@ -171,9 +174,11 @@ void add_kallsyms(struct mod