[PATCH v3 08/28] module: Use RCU in module_kallsyms_on_each_symbol().
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: 2025-01-08 09:05:19
Also in:
lkml
Subsystem:
module support, the rest · Maintainers:
Luis Chamberlain, Petr Pavlu, Daniel Gomez, Sami Tolvanen, Linus Torvalds
module::kallsyms can be accessed under RCU assumption. Use rcu_dereference() to access module::kallsyms. Update callers. Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> --- kernel/module/kallsyms.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/kernel/module/kallsyms.c b/kernel/module/kallsyms.c
index e3c55bc879c11..0e8ec6486d95c 100644
--- a/kernel/module/kallsyms.c
+++ b/kernel/module/kallsyms.c@@ -476,10 +476,8 @@ int module_kallsyms_on_each_symbol(const char *modname, if (modname && strcmp(modname, mod->name)) continue; - /* Use rcu_dereference_sched() to remain compliant with the sparse tool */ - preempt_disable(); - kallsyms = rcu_dereference_sched(mod->kallsyms); - preempt_enable(); + kallsyms = rcu_dereference_check(mod->kallsyms, + lockdep_is_held(&module_mutex)); for (i = 0; i < kallsyms->num_symtab; i++) { const Elf_Sym *sym = &kallsyms->symtab[i];
--
2.47.1