From: Peter Zijlstra peterz@infradead.org
[ Upstream commit 2bee6d16e4379326b1eea454e68c98b17456769e ]
It turns out that static_call_text_reserved() was reporting __init text as being reserved past the time when the __init text was freed and re-used.
This is mostly harmless and will at worst result in refusing a kprobe.
Fixes: 6333e8f73b83 ("static_call: Avoid kprobes on inline static_call()s") Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Signed-off-by: Ingo Molnar mingo@kernel.org Reviewed-by: Masami Hiramatsu mhiramat@kernel.org Link: https://lore.kernel.org/r/20210628113045.106211657@infradead.org Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/static_call.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/kernel/static_call.c b/kernel/static_call.c index f59089a12231..b62a0c41c905 100644 --- a/kernel/static_call.c +++ b/kernel/static_call.c @@ -292,13 +292,15 @@ static int addr_conflict(struct static_call_site *site, void *start, void *end)
static int __static_call_text_reserved(struct static_call_site *iter_start, struct static_call_site *iter_stop, - void *start, void *end) + void *start, void *end, bool init) { struct static_call_site *iter = iter_start;
while (iter < iter_stop) { - if (addr_conflict(iter, start, end)) - return 1; + if (init || !static_call_is_init(iter)) { + if (addr_conflict(iter, start, end)) + return 1; + } iter++; }
@@ -324,7 +326,7 @@ static int __static_call_mod_text_reserved(void *start, void *end)
ret = __static_call_text_reserved(mod->static_call_sites, mod->static_call_sites + mod->num_static_call_sites, - start, end); + start, end, mod->state == MODULE_STATE_COMING);
module_put(mod);
@@ -459,8 +461,9 @@ static inline int __static_call_mod_text_reserved(void *start, void *end)
int static_call_text_reserved(void *start, void *end) { + bool init = system_state < SYSTEM_RUNNING; int ret = __static_call_text_reserved(__start_static_call_sites, - __stop_static_call_sites, start, end); + __stop_static_call_sites, start, end, init);
if (ret) return ret;