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| author | Peter Zijlstra <peterz@infradead.org> | 2021-06-28 13:24:11 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2021-07-05 10:46:33 +0200 |
| commit | 2bee6d16e4379326b1eea454e68c98b17456769e (patch) | |
| tree | 2c3bba902842b9aa74a021359db5a540605ffb44 /kernel | |
| parent | 9e667624c291753b8a5128f620f493d0b5226063 (diff) | |
| download | linux-2bee6d16e4379326b1eea454e68c98b17456769e.tar.gz linux-2bee6d16e4379326b1eea454e68c98b17456769e.tar.bz2 linux-2bee6d16e4379326b1eea454e68c98b17456769e.zip | |
static_call: Fix static_call_text_reserved() vs __init
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
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/static_call.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/kernel/static_call.c b/kernel/static_call.c index 723fcc9d20db..43ba0b1e0edb 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; |