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module: include other structures in module version check 

With CONFIG_MODVERSIONS, we version 'struct module' using a dummy
export, but other things matter too:

1) 'struct modversion_info' determines the layout of the __versions section,
2) 'struct kernel_param' determines the layout of the __params section,
3) 'struct kernel_symbol' determines __ksymtab*.
4) 'struct marker' determines __markers.
5) 'struct tracepoint' determines __tracepoints.

So we rename 'struct_module' to 'module_layout' and include these in
the signature.  Now it's general we can add others later on without
confusion.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2009-03-31 13:05:34 -06:00
parent 9cb610d8e3
commit 8c8ef42aee
2 changed files with 15 additions and 7 deletions
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18
kernel/module.c
View File

@ -1052,9 +1052,9 @@ static inline int check_modstruct_version(Elf_Shdr *sechdrs,
{
const unsigned long *crc;
if (!find_symbol("struct_module", NULL, &crc, true, false))
if (!find_symbol("module_layout", NULL, &crc, true, false))
BUG();
return check_version(sechdrs, versindex, "struct_module", mod, crc);
return check_version(sechdrs, versindex, "module_layout", mod, crc);
}
/* First part is kernel version, which we ignore if module has crcs. */
@ -2858,9 +2858,17 @@ void print_modules(void)
}
#ifdef CONFIG_MODVERSIONS
/* Generate the signature for struct module here, too, for modversions. */
void struct_module(struct module *mod) { return; }
EXPORT_SYMBOL(struct_module);
/* Generate the signature for all relevant module structures here.
* If these change, we don't want to try to parse the module. */
void module_layout(struct module *mod,
struct modversion_info *ver,
struct kernel_param *kp,
struct kernel_symbol *ks,
struct marker *marker,
struct tracepoint *tp)
{
}
EXPORT_SYMBOL(module_layout);
#endif
#ifdef CONFIG_MARKERS

4
scripts/mod/modpost.c
View File

@ -1607,12 +1607,12 @@ static void read_symbols(char *modname)
parse_elf_finish(&info);
/* Our trick to get versioning for struct_module - it's
/* Our trick to get versioning for module struct etc. - it's
* never passed as an argument to an exported function, so
* the automatic versioning doesn't pick it up, but it's really
* important anyhow */
if (modversions)
mod->unres = alloc_symbol("struct_module", 0, mod->unres);
mod->unres = alloc_symbol("module_layout", 0, mod->unres);
}
#define SZ 500