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ARM: 8976/1: module: allow arch overrides for .init section names

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ARM stores unwind information for .init.text in sections named
.ARM.extab.init.text and .ARM.exidx.init.text.  Since those aren't
currently recognized as init sections, they're allocated along with the
core section, and relocation fails if the core and the init section are
allocated from different regions and can't reach other.

  final section addresses:
        ...
        0x7f800000 .init.text
        ..
        0xcbb54078 .ARM.exidx.init.text
        ..

 section 16 reloc 0 sym '': relocation 42 out of range (0xcbb54078 ->
 0x7f800000)

Allow architectures to override the section name so that ARM can fix
this.

Acked-by: Jessica Yu <jeyu@kernel.org>
Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Vincent Whitchurch 2020-05-14 11:36:41 +01:00 committed by Russell King
parent cdcb07e45a
commit 2318976619
2 changed files with 12 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/linux/moduleloader.h
View File

@ -29,6 +29,11 @@ void *module_alloc(unsigned long size);
/* Free memory returned from module_alloc. */
void module_memfree(void *module_region);
/* Determines if the section name is an init section (that is only used during
* module loading).
*/
bool module_init_section(const char *name);
/* Determines if the section name is an exit section (that is only used during
* module unloading)
*/

9
kernel/module.c
View File

@ -2400,7 +2400,7 @@ static void layout_sections(struct module *mod, struct load_info *info)
if ((s->sh_flags & masks[m][0]) != masks[m][0]
|| (s->sh_flags & masks[m][1])
|| s->sh_entsize != ~0UL
|| strstarts(sname, ".init"))
|| module_init_section(sname))
continue;
s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i);
pr_debug("\t%s\n", sname);
@ -2433,7 +2433,7 @@ static void layout_sections(struct module *mod, struct load_info *info)
if ((s->sh_flags & masks[m][0]) != masks[m][0]
|| (s->sh_flags & masks[m][1])
|| s->sh_entsize != ~0UL
|| !strstarts(sname, ".init"))
|| !module_init_section(sname))
continue;
s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i)
| INIT_OFFSET_MASK);
@ -2768,6 +2768,11 @@ void * __weak module_alloc(unsigned long size)
return vmalloc_exec(size);
}
bool __weak module_init_section(const char *name)
{
return strstarts(name, ".init");
}
bool __weak module_exit_section(const char *name)
{
return strstarts(name, ".exit");