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Diffstat (limited to 'arch/s390/kernel/module.c')
-rw-r--r--arch/s390/kernel/module.c73
1 files changed, 34 insertions, 39 deletions
diff --git a/arch/s390/kernel/module.c b/arch/s390/kernel/module.c
index 2d159b32885b..9d1f8a50f5a4 100644
--- a/arch/s390/kernel/module.c
+++ b/arch/s390/kernel/module.c
@@ -21,11 +21,15 @@
#include <linux/moduleloader.h>
#include <linux/bug.h>
#include <linux/memory.h>
+#include <linux/execmem.h>
+#include <asm/arch-stackprotector.h>
#include <asm/alternative.h>
#include <asm/nospec-branch.h>
#include <asm/facility.h>
#include <asm/ftrace.lds.h>
#include <asm/set_memory.h>
+#include <asm/setup.h>
+#include <asm/asm-offsets.h>
#if 0
#define DEBUGP printk
@@ -35,27 +39,10 @@
#define PLT_ENTRY_SIZE 22
-void *module_alloc(unsigned long size)
-{
- gfp_t gfp_mask = GFP_KERNEL;
- void *p;
-
- if (PAGE_ALIGN(size) > MODULES_LEN)
- return NULL;
- p = __vmalloc_node_range(size, MODULE_ALIGN, MODULES_VADDR, MODULES_END,
- gfp_mask, PAGE_KERNEL_EXEC, VM_DEFER_KMEMLEAK, NUMA_NO_NODE,
- __builtin_return_address(0));
- if (p && (kasan_alloc_module_shadow(p, size, gfp_mask) < 0)) {
- vfree(p);
- return NULL;
- }
- return p;
-}
-
#ifdef CONFIG_FUNCTION_TRACER
void module_arch_cleanup(struct module *mod)
{
- module_memfree(mod->arch.trampolines_start);
+ execmem_free(mod->arch.trampolines_start);
}
#endif
@@ -126,6 +113,7 @@ 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 +161,15 @@ 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 +293,7 @@ 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 +318,8 @@ 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 +
+ me->arch.got_offset - loc;
rc = apply_rela_bits(loc, val, 1, 32, 1, write);
}
break;
@@ -345,7 +335,7 @@ 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 +365,7 @@ 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 +387,7 @@ 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 +397,7 @@ 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);
@@ -486,10 +476,10 @@ static int module_alloc_ftrace_hotpatch_trampolines(struct module *me,
size = FTRACE_HOTPATCH_TRAMPOLINES_SIZE(s->sh_size);
numpages = DIV_ROUND_UP(size, PAGE_SIZE);
- start = module_alloc(numpages * PAGE_SIZE);
+ start = execmem_alloc(EXECMEM_FTRACE, numpages * PAGE_SIZE);
if (!start)
return -ENOMEM;
- set_memory_ro((unsigned long)start, numpages);
+ set_memory_rox((unsigned long)start, numpages);
end = start + size;
me->arch.trampolines_start = (struct ftrace_hotpatch_trampoline *)start;
@@ -507,15 +497,13 @@ int module_finalize(const Elf_Ehdr *hdr,
const Elf_Shdr *s;
char *secstrings, *secname;
void *aseg;
-#ifdef CONFIG_FUNCTION_TRACER
- int ret;
-#endif
+ int rc = 0;
if (IS_ENABLED(CONFIG_EXPOLINE) &&
!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 . */
@@ -539,14 +527,21 @@ int module_finalize(const Elf_Ehdr *hdr,
(str_has_prefix(secname, ".s390_return")))
nospec_revert(aseg, aseg + s->sh_size);
+ if (IS_ENABLED(CONFIG_STACKPROTECTOR) &&
+ (str_has_prefix(secname, "__stack_protector_loc"))) {
+ rc = stack_protector_apply(aseg, aseg + s->sh_size);
+ if (rc)
+ break;
+ }
+
#ifdef CONFIG_FUNCTION_TRACER
if (!strcmp(FTRACE_CALLSITE_SECTION, secname)) {
- ret = module_alloc_ftrace_hotpatch_trampolines(me, s);
- if (ret < 0)
- return ret;
+ rc = module_alloc_ftrace_hotpatch_trampolines(me, s);
+ if (rc)
+ break;
}
#endif /* CONFIG_FUNCTION_TRACER */
}
- return 0;
+ return rc;
}
generated by cgit (git 2.34.1) at 2025-12-21 23:40:34 +0000