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module: fix ddebug_remove_module()
ddebug_remove_module() use mod->name to find the ddebug_table of the module and remove it. But dynamic_debug_setup() use the first _ddebug->modname to create ddebug_table for the module. It's ok when the _ddebug->modname is the same with the mod->name. But livepatch module is special, it may contain _ddebugs of other modules, the modname of which is different from the name of livepatch module. So ddebug_remove_module() can't use mod->name to find the right ddebug_table and remove it. It can cause kernel crash when we cat the file <debugfs>/dynamic_debug/control. Signed-off-by: Zhou Chengming <zhouchengming1@huawei.com> Signed-off-by: Jessica Yu <jeyu@kernel.org>
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parent
4fd3e4ef1f
commit
5279631271
@ -2707,21 +2707,21 @@ static void add_kallsyms(struct module *mod, const struct load_info *info)
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}
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}
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#endif /* CONFIG_KALLSYMS */
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#endif /* CONFIG_KALLSYMS */
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static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
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static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num)
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{
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{
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if (!debug)
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if (!debug)
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return;
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return;
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#ifdef CONFIG_DYNAMIC_DEBUG
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#ifdef CONFIG_DYNAMIC_DEBUG
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if (ddebug_add_module(debug, num, debug->modname))
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if (ddebug_add_module(debug, num, mod->name))
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pr_err("dynamic debug error adding module: %s\n",
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pr_err("dynamic debug error adding module: %s\n",
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debug->modname);
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debug->modname);
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#endif
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#endif
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}
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}
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static void dynamic_debug_remove(struct _ddebug *debug)
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static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug)
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{
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{
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if (debug)
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if (debug)
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ddebug_remove_module(debug->modname);
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ddebug_remove_module(mod->name);
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}
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}
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void * __weak module_alloc(unsigned long size)
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void * __weak module_alloc(unsigned long size)
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@ -3715,7 +3715,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
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goto free_arch_cleanup;
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goto free_arch_cleanup;
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}
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}
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dynamic_debug_setup(info->debug, info->num_debug);
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dynamic_debug_setup(mod, info->debug, info->num_debug);
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/* Ftrace init must be called in the MODULE_STATE_UNFORMED state */
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/* Ftrace init must be called in the MODULE_STATE_UNFORMED state */
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ftrace_module_init(mod);
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ftrace_module_init(mod);
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@ -3779,7 +3779,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
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module_disable_nx(mod);
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module_disable_nx(mod);
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ddebug_cleanup:
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ddebug_cleanup:
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dynamic_debug_remove(info->debug);
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dynamic_debug_remove(mod, info->debug);
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synchronize_sched();
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synchronize_sched();
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kfree(mod->args);
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kfree(mod->args);
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free_arch_cleanup:
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free_arch_cleanup:
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