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module: Use RCU in module_kallsyms_on_each_symbol().

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module::kallsyms can be accessed under RCU assumption.

Use rcu_dereference() to access module::kallsyms.
Update callers.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250108090457.512198-9-bigeasy@linutronix.de
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
This commit is contained in:
Sebastian Andrzej Siewior 2025-01-08 10:04:37 +01:00 committed by Petr Pavlu
parent f27d8ed6a6
commit cdd9335c13
1 changed files with 2 additions and 4 deletions
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6
kernel/module/kallsyms.c
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@ -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];