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kprobes: Support NOKPROBE_SYMBOL() in modules 

Support NOKPROBE_SYMBOL() in modules. NOKPROBE_SYMBOL() records only symbol
address in "_kprobe_blacklist" section in the module.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200505134059.771170126@linutronix.de
This commit is contained in:
Masami Hiramatsu 2020-03-26 23:50:00 +09:00 committed by Thomas Gleixner
parent 1e6769b0ae
commit 16db6264c9
3 changed files with 22 additions and 0 deletions
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2
include/linux/module.h
View File

@ -492,6 +492,8 @@ struct module {
#ifdef CONFIG_KPROBES
void *kprobes_text_start;
unsigned int kprobes_text_size;
unsigned long *kprobe_blacklist;
unsigned int num_kprobe_blacklist;
#endif
#ifdef CONFIG_LIVEPATCH

17
kernel/kprobes.c
View File

@ -2192,6 +2192,11 @@ static void kprobe_remove_area_blacklist(unsigned long start, unsigned long end)
}
}
static void kprobe_remove_ksym_blacklist(unsigned long entry)
{
kprobe_remove_area_blacklist(entry, entry + 1);
}
int __init __weak arch_populate_kprobe_blacklist(void)
{
return 0;
@ -2231,6 +2236,12 @@ static int __init populate_kprobe_blacklist(unsigned long *start,
static void add_module_kprobe_blacklist(struct module *mod)
{
unsigned long start, end;
int i;
if (mod->kprobe_blacklist) {
for (i = 0; i < mod->num_kprobe_blacklist; i++)
kprobe_add_ksym_blacklist(mod->kprobe_blacklist[i]);
}
start = (unsigned long)mod->kprobes_text_start;
if (start) {
@ -2242,6 +2253,12 @@ static void add_module_kprobe_blacklist(struct module *mod)
static void remove_module_kprobe_blacklist(struct module *mod)
{
unsigned long start, end;
int i;
if (mod->kprobe_blacklist) {
for (i = 0; i < mod->num_kprobe_blacklist; i++)
kprobe_remove_ksym_blacklist(mod->kprobe_blacklist[i]);
}
start = (unsigned long)mod->kprobes_text_start;
if (start) {

3
kernel/module.c
View File

@ -3197,6 +3197,9 @@ static int find_module_sections(struct module *mod, struct load_info *info)
#ifdef CONFIG_KPROBES
mod->kprobes_text_start = section_objs(info, ".kprobes.text", 1,
&mod->kprobes_text_size);
mod->kprobe_blacklist = section_objs(info, "_kprobe_blacklist",
sizeof(unsigned long),
&mod->num_kprobe_blacklist);
#endif
mod->extable = section_objs(info, "__ex_table",
sizeof(*mod->extable), &mod->num_exentries);