Instrumentation is forbidden in the .noinstr.text section. Make kprobes respect this.
Signed-off-by: Thomas Gleixner <[email protected]> --- include/linux/module.h | 2 ++ kernel/kprobes.c | 18 ++++++++++++++++++ kernel/module.c | 3 +++ 3 files changed, 23 insertions(+) --- a/include/linux/module.h +++ b/include/linux/module.h @@ -458,6 +458,8 @@ struct module { void __percpu *percpu; unsigned int percpu_size; #endif + void *noinstr_text_start; + unsigned int noinstr_text_size; #ifdef CONFIG_TRACEPOINTS unsigned int num_tracepoints; --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -2229,6 +2229,12 @@ static int __init populate_kprobe_blackl /* Symbols in __kprobes_text are blacklisted */ ret = kprobe_add_area_blacklist((unsigned long)__kprobes_text_start, (unsigned long)__kprobes_text_end); + if (ret) + return ret; + + /* Symbols in noinstr section are blacklisted */ + ret = kprobe_add_area_blacklist((unsigned long)__noinstr_text_start, + (unsigned long)__noinstr_text_end); return ret ? : arch_populate_kprobe_blacklist(); } @@ -2248,6 +2254,12 @@ static void add_module_kprobe_blacklist( end = start + mod->kprobes_text_size; kprobe_add_area_blacklist(start, end); } + + start = (unsigned long)mod->noinstr_text_start; + if (start) { + end = start + mod->noinstr_text_size; + kprobe_add_area_blacklist(start, end); + } } static void remove_module_kprobe_blacklist(struct module *mod) @@ -2265,6 +2277,12 @@ static void remove_module_kprobe_blackli end = start + mod->kprobes_text_size; kprobe_remove_area_blacklist(start, end); } + + start = (unsigned long)mod->noinstr_text_start; + if (start) { + end = start + mod->noinstr_text_size; + kprobe_remove_area_blacklist(start, end); + } } /* Module notifier call back, checking kprobes on the module */ --- a/kernel/module.c +++ b/kernel/module.c @@ -3150,6 +3150,9 @@ static int find_module_sections(struct m } #endif + mod->noinstr_text_start = section_objs(info, ".noinstr.text", 1, + &mod->noinstr_text_size); + #ifdef CONFIG_TRACEPOINTS mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", sizeof(*mod->tracepoints_ptrs),
