diff options
| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2022-02-23 13:02:13 +0100 |
|---|---|---|
| committer | Luis Chamberlain <mcgrof@kernel.org> | 2022-04-05 08:43:05 -0700 |
| commit | 6ab9942c44b2d213a16b2620e4baf0223122222f (patch) | |
| tree | 0ca6816cea5a0928994fa94ae4868df9b4f48b56 /kernel/module/main.c | |
| parent | 446d55666d5599ca58c1ceac25ce4b5191e70835 (diff) | |
| download | linux-6ab9942c44b2d213a16b2620e4baf0223122222f.tar.bz2 | |
module: Introduce data_layout
In order to allow separation of data from text, add another layout,
called data_layout. For architectures requesting separation of text
and data, only text will go in core_layout and data will go in
data_layout.
For architectures which keep text and data together, make data_layout
an alias of core_layout, that way data_layout can be used for all
data manipulations, regardless of whether data is in core_layout or
data_layout.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Diffstat (limited to 'kernel/module/main.c')
| -rw-r--r-- | kernel/module/main.c | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/kernel/module/main.c b/kernel/module/main.c index 392ac847d90a..78658283408d 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -1190,7 +1190,7 @@ static void free_module(struct module *mod) percpu_modfree(mod); /* Free lock-classes; relies on the preceding sync_rcu(). */ - lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); + lockdep_free_key_range(mod->data_layout.base, mod->data_layout.size); /* Finally, free the core (containing the module structure) */ module_memfree(mod->core_layout.base); @@ -1431,13 +1431,15 @@ static void layout_sections(struct module *mod, struct load_info *info) for (i = 0; i < info->hdr->e_shnum; ++i) { Elf_Shdr *s = &info->sechdrs[i]; const char *sname = info->secstrings + s->sh_name; + unsigned int *sizep; if ((s->sh_flags & masks[m][0]) != masks[m][0] || (s->sh_flags & masks[m][1]) || s->sh_entsize != ~0UL || module_init_layout_section(sname)) continue; - s->sh_entsize = module_get_offset(mod, &mod->core_layout.size, s, i); + sizep = m ? &mod->data_layout.size : &mod->core_layout.size; + s->sh_entsize = module_get_offset(mod, sizep, s, i); pr_debug("\t%s\n", sname); } switch (m) { @@ -1446,15 +1448,15 @@ static void layout_sections(struct module *mod, struct load_info *info) mod->core_layout.text_size = mod->core_layout.size; break; case 1: /* RO: text and ro-data */ - mod->core_layout.size = strict_align(mod->core_layout.size); - mod->core_layout.ro_size = mod->core_layout.size; + mod->data_layout.size = strict_align(mod->data_layout.size); + mod->data_layout.ro_size = mod->data_layout.size; break; case 2: /* RO after init */ - mod->core_layout.size = strict_align(mod->core_layout.size); - mod->core_layout.ro_after_init_size = mod->core_layout.size; + mod->data_layout.size = strict_align(mod->data_layout.size); + mod->data_layout.ro_after_init_size = mod->data_layout.size; break; case 4: /* whole core */ - mod->core_layout.size = strict_align(mod->core_layout.size); + mod->data_layout.size = strict_align(mod->data_layout.size); break; } } @@ -2134,6 +2136,8 @@ static int move_module(struct module *mod, struct load_info *info) if (shdr->sh_entsize & INIT_OFFSET_MASK) dest = mod->init_layout.base + (shdr->sh_entsize & ~INIT_OFFSET_MASK); + else if (!(shdr->sh_flags & SHF_EXECINSTR)) + dest = mod->data_layout.base + shdr->sh_entsize; else dest = mod->core_layout.base + shdr->sh_entsize; @@ -2829,7 +2833,7 @@ static int load_module(struct load_info *info, const char __user *uargs, mutex_unlock(&module_mutex); free_module: /* Free lock-classes; relies on the preceding sync_rcu() */ - lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); + lockdep_free_key_range(mod->data_layout.base, mod->data_layout.size); module_deallocate(mod, info); free_copy: |