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MODRESTART: Defer restart to the event loop

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When a remote MODRESTART command is received, it will pass through the
ENCAP module. The ms_encap function is responsible for dispatching the
command handler and then the modules will eventually be reloaded.

However, if the ENCAP module is reloaded to a different address, the
stack now contains the address of a function that no longer exists.

Return immediately from the command handler and have the event loop
call the function responsible for reloading the modules instead.

Reported-by: mniip (Freenode)
This commit is contained in:
Aaron Jones 2016-12-28 20:15:39 +00:00
parent 9cdd7270f9
commit db05a36210
No known key found for this signature in database
GPG key ID: EC6F86EE9CD840B5
1 changed files with 26 additions and 14 deletions
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40
src/modules.c
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@ -463,21 +463,10 @@ mo_modlist(struct Client *client_p, struct Client *source_p, int parc, const cha
}
/* unload and reload all modules */
static int
mo_modrestart(struct Client *client_p, struct Client *source_p, int parc, const char **parv)
static void
modules_do_restart(void *unused)
{
int modnum;
if(!IsOperAdmin(source_p))
{
sendto_one(source_p, form_str(ERR_NOPRIVS),
me.name, source_p->name, "admin");
return 0;
}
sendto_one_notice(source_p, ":Reloading all modules");
modnum = num_mods;
int modnum = num_mods;
while (num_mods)
unload_one_module(modlist[0]->name, 0);
@ -489,6 +478,29 @@ mo_modrestart(struct Client *client_p, struct Client *source_p, int parc, const
"Module Restart: %d modules unloaded, %d modules loaded",
modnum, num_mods);
ilog(L_MAIN, "Module Restart: %d modules unloaded, %d modules loaded", modnum, num_mods);
}
static int
mo_modrestart(struct Client *client_p, struct Client *source_p, int parc, const char **parv)
{
if(!IsOperAdmin(source_p))
{
sendto_one(source_p, form_str(ERR_NOPRIVS),
me.name, source_p->name, "admin");
return 0;
}
sendto_one_notice(source_p, ":Reloading all modules");
/*
* If a remote MODRESTART is received, m_encap.so will be reloaded,
* but ms_encap is in the call stack (it indirectly calls this
* function). This will go horribly wrong if m_encap is reloaded to
* a different address.
*
* So, defer the restart to the event loop (above) and return now.
*/
rb_event_addonce("modules_do_restart", modules_do_restart, NULL, 1);
return 0;
}