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module: clean up RO/NX handling.

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Modules have three sections: text, rodata and writable data.  The code
handled the case where these overlapped, however they never can:
debug_align() ensures they are always page-aligned.

This is why we got away with manually traversing the pages in
set_all_modules_text_rw() without rounding.

We create three helper functions: frob_text(), frob_rodata() and
frob_writable_data().  We then call these explicitly at every point,
so it's clear what we're doing.

We also expose module_enable_ro() and module_disable_ro() for
livepatch to use.

Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Rusty Russell 2015-11-26 09:45:08 +10:30 • committed by Jiri Kosina
parent 7523e4dc50
commit 85c898db63
2 changed files with 82 additions and 92 deletions
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4
include/linux/module.h
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@ -762,9 +762,13 @@ extern int module_sysfs_initialized;
#ifdef CONFIG_DEBUG_SET_MODULE_RONX
extern void set_all_modules_text_rw(void);
extern void set_all_modules_text_ro(void);
extern void module_enable_ro(const struct module *mod);
extern void module_disable_ro(const struct module *mod);
#else
static inline void set_all_modules_text_rw(void) { }
static inline void set_all_modules_text_ro(void) { }
static inline void module_enable_ro(const struct module *mod) { }
static inline void module_disable_ro(const struct module *mod) { }
#endif
#ifdef CONFIG_GENERIC_BUG