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static_call: Fix static_call_text_reserved() vs __init

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[ 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: 6333e8f73b ("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>
This commit is contained in:
Peter Zijlstra 2021-06-28 13:24:11 +02:00 committed by Greg Kroah-Hartman
parent 59ae35884c
commit 53c5c2496f
1 changed files with 8 additions and 5 deletions
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13
kernel/static_call.c
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@ -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;