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kprobes: tracing/kprobes: Fix to kill kprobes on initmem after boot

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commit 82d083ab60c3693201c6f5c7a5f23a6ed422098d upstream.

Since kprobe_event= cmdline option allows user to put kprobes on the
functions in initmem, kprobe has to make such probes gone after boot.
Currently the probes on the init functions in modules will be handled
by module callback, but the kernel init text isn't handled.
Without this, kprobes may access non-exist text area to disable or
remove it.

Link: https://lkml.kernel.org/r/159972810544.428528.1839307531600646955.stgit@devnote2

Fixes: 970988e19e ("tracing/kprobe: Add kprobe_event= boot parameter")
Cc: Jonathan Corbet <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: [email protected]
Signed-off-by: Masami Hiramatsu <[email protected]>
Signed-off-by: Steven Rostedt (VMware) <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Masami Hiramatsu 2020-09-10 17:55:05 +09:00 • committed by Greg Kroah-Hartman
commit c4ab0a8370
3 changed files with 29 additions and 0 deletions
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22
kernel/kprobes.c
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@ -2309,6 +2309,28 @@ static struct notifier_block kprobe_module_nb = {
extern unsigned long __start_kprobe_blacklist[];
extern unsigned long __stop_kprobe_blacklist[];
void kprobe_free_init_mem(void)
{
void *start = (void *)(&__init_begin);
void *end = (void *)(&__init_end);
struct hlist_head *head;
struct kprobe *p;
int i;
mutex_lock(&kprobe_mutex);
/* Kill all kprobes on initmem */
for (i = 0; i < KPROBE_TABLE_SIZE; i++) {
head = &kprobe_table[i];
hlist_for_each_entry(p, head, hlist) {
if (start <= (void *)p->addr && (void *)p->addr < end)
kill_kprobe(p);
}
}
mutex_unlock(&kprobe_mutex);
}
static int __init init_kprobes(void)
{
int i, err = 0;