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static_call: Avoid kprobes on inline static_call()s

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Similar to how we disallow kprobes on any other dynamic text
(ftrace/jump_label) also disallow kprobes on inline static_call()s.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200818135804.744920586@infradead.org
This commit is contained in:
Peter Zijlstra
2020-08-18 15:57:43 +02:00
committed by Ingo Molnar
parent 9183c3f9ed
commit 6333e8f73b
4 changed files with 84 additions and 1 deletions
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11
include/linux/static_call.h
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@@ -110,6 +110,7 @@ struct static_call_key {
extern void __static_call_update(struct static_call_key *key, void *tramp, void *func);
extern int static_call_mod_init(struct module *mod);
extern int static_call_text_reserved(void *start, void *end);
#define DEFINE_STATIC_CALL(name, _func) \
DECLARE_STATIC_CALL(name, _func); \
@@ -153,6 +154,11 @@ void __static_call_update(struct static_call_key *key, void *tramp, void *func)
cpus_read_unlock();
}
static inline int static_call_text_reserved(void *start, void *end)
{
return 0;
}
#define EXPORT_STATIC_CALL(name) \
EXPORT_SYMBOL(STATIC_CALL_KEY(name)); \
EXPORT_SYMBOL(STATIC_CALL_TRAMP(name))
@@ -182,6 +188,11 @@ void __static_call_update(struct static_call_key *key, void *tramp, void *func)
WRITE_ONCE(key->func, func);
}
static inline int static_call_text_reserved(void *start, void *end)
{
return 0;
}
#define EXPORT_STATIC_CALL(name) EXPORT_SYMBOL(STATIC_CALL_KEY(name))
#define EXPORT_STATIC_CALL_GPL(name) EXPORT_SYMBOL_GPL(STATIC_CALL_KEY(name))