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-rw-r--r--include/linux/module.h2
-rw-r--r--kernel/module.c68
2 files changed, 57 insertions, 13 deletions
diff --git a/include/linux/module.h b/include/linux/module.h
index 1d3ccb173fd6..aca980365956 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -315,7 +315,7 @@ struct module
*/
Elf_Sym *symtab, *core_symtab;
unsigned int num_symtab, core_num_syms;
- char *strtab;
+ char *strtab, *core_strtab;
/* Section attributes */
struct module_sect_attrs *sect_attrs;
diff --git a/kernel/module.c b/kernel/module.c
index 97f4d5e15535..39827c3d9484 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1886,12 +1886,17 @@ static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
static unsigned long layout_symtab(struct module *mod,
Elf_Shdr *sechdrs,
unsigned int symindex,
+ unsigned int strindex,
const Elf_Ehdr *hdr,
- const char *secstrings)
+ const char *secstrings,
+ unsigned long *pstroffs,
+ unsigned long *strmap)
{
unsigned long symoffs;
Elf_Shdr *symsect = sechdrs + symindex;
+ Elf_Shdr *strsect = sechdrs + strindex;
const Elf_Sym *src;
+ const char *strtab;
unsigned int i, nsrc, ndst;
/* Put symbol section at end of init part of module. */
@@ -1902,14 +1907,31 @@ static unsigned long layout_symtab(struct module *mod,
src = (void *)hdr + symsect->sh_offset;
nsrc = symsect->sh_size / sizeof(*src);
+ strtab = (void *)hdr + strsect->sh_offset;
for (ndst = i = 1; i < nsrc; ++i, ++src)
- if (is_core_symbol(src, sechdrs, hdr->e_shnum))
+ if (is_core_symbol(src, sechdrs, hdr->e_shnum)) {
+ unsigned int j = src->st_name;
+
+ while(!__test_and_set_bit(j, strmap) && strtab[j])
+ ++j;
++ndst;
+ }
/* Append room for core symbols at end of core part. */
symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
mod->core_size = symoffs + ndst * sizeof(Elf_Sym);
+ /* Put string table section at end of init part of module. */
+ strsect->sh_flags |= SHF_ALLOC;
+ strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
+ strindex) | INIT_OFFSET_MASK;
+ DEBUGP("\t%s\n", secstrings + strsect->sh_name);
+
+ /* Append room for core symbols' strings at end of core part. */
+ *pstroffs = mod->core_size;
+ __set_bit(0, strmap);
+ mod->core_size += bitmap_weight(strmap, strsect->sh_size);
+
return symoffs;
}
@@ -1919,11 +1941,14 @@ static void add_kallsyms(struct module *mod,
unsigned int symindex,
unsigned int strindex,
unsigned long symoffs,
- const char *secstrings)
+ unsigned long stroffs,
+ const char *secstrings,
+ unsigned long *strmap)
{
unsigned int i, ndst;
const Elf_Sym *src;
Elf_Sym *dst;
+ char *s;
mod->symtab = (void *)sechdrs[symindex].sh_addr;
mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
@@ -1941,16 +1966,25 @@ static void add_kallsyms(struct module *mod,
if (!is_core_symbol(src, sechdrs, shnum))
continue;
dst[ndst] = *src;
+ dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name);
++ndst;
}
mod->core_num_syms = ndst;
+
+ mod->core_strtab = s = mod->module_core + stroffs;
+ for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i)
+ if (test_bit(i, strmap))
+ *++s = mod->strtab[i];
}
#else
static inline unsigned long layout_symtab(struct module *mod,
Elf_Shdr *sechdrs,
unsigned int symindex,
+ unsigned int strindex,
const Elf_Hdr *hdr,
- const char *secstrings)
+ const char *secstrings,
+ unsigned long *pstroffs,
+ unsigned long *strmap)
{
}
static inline void add_kallsyms(struct module *mod,
@@ -1959,7 +1993,9 @@ static inline void add_kallsyms(struct module *mod,
unsigned int symindex,
unsigned int strindex,
unsigned long symoffs,
- const char *secstrings)
+ unsigned long stroffs,
+ const char *secstrings,
+ const unsigned long *strmap)
{
}
#endif /* CONFIG_KALLSYMS */
@@ -2035,7 +2071,7 @@ static noinline struct module *load_module(void __user *umod,
long err = 0;
void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
#ifdef CONFIG_KALLSYMS
- unsigned long symoffs;
+ unsigned long symoffs, stroffs, *strmap;
#endif
mm_segment_t old_fs;
@@ -2118,10 +2154,6 @@ static noinline struct module *load_module(void __user *umod,
/* Don't keep modinfo and version sections. */
sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
-#ifdef CONFIG_KALLSYMS
- /* Keep string table for decoding later. */
- sechdrs[strindex].sh_flags |= SHF_ALLOC;
-#endif
/* Check module struct version now, before we try to use module. */
if (!check_modstruct_version(sechdrs, versindex, mod)) {
@@ -2157,6 +2189,13 @@ static noinline struct module *load_module(void __user *umod,
goto free_hdr;
}
+ strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size)
+ * sizeof(long), GFP_KERNEL);
+ if (!strmap) {
+ err = -ENOMEM;
+ goto free_mod;
+ }
+
if (find_module(mod->name)) {
err = -EEXIST;
goto free_mod;
@@ -2186,7 +2225,8 @@ static noinline struct module *load_module(void __user *umod,
this is done generically; there doesn't appear to be any
special cases for the architectures. */
layout_sections(mod, hdr, sechdrs, secstrings);
- symoffs = layout_symtab(mod, sechdrs, symindex, hdr, secstrings);
+ symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr,
+ secstrings, &stroffs, strmap);
/* Do the allocs. */
ptr = module_alloc_update_bounds(mod->core_size);
@@ -2392,7 +2432,9 @@ static noinline struct module *load_module(void __user *umod,
sechdrs[pcpuindex].sh_size);
add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex,
- symoffs, secstrings);
+ symoffs, stroffs, secstrings, strmap);
+ kfree(strmap);
+ strmap = NULL;
if (!mod->taints) {
struct _ddebug *debug;
@@ -2481,6 +2523,7 @@ static noinline struct module *load_module(void __user *umod,
percpu_modfree(percpu);
free_mod:
kfree(args);
+ kfree(strmap);
free_hdr:
vfree(hdr);
return ERR_PTR(err);
@@ -2573,6 +2616,7 @@ SYSCALL_DEFINE3(init_module, void __user *, umod,
#ifdef CONFIG_KALLSYMS
mod->num_symtab = mod->core_num_syms;
mod->symtab = mod->core_symtab;
+ mod->strtab = mod->core_strtab;
#endif
module_free(mod, mod->module_init);
mod->module_init = NULL;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 18:29:21 +0000