aboutsummaryrefslogtreecommitdiff
path: root/kernel/kprobes.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/kprobes.c')
-rw-r--r--kernel/kprobes.c601
1 files changed, 337 insertions, 264 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 098f396aa40..734e9a7d280 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -86,21 +86,8 @@ static raw_spinlock_t *kretprobe_table_lock_ptr(unsigned long hash)
return &(kretprobe_table_locks[hash].lock);
}
-/*
- * Normally, functions that we'd want to prohibit kprobes in, are marked
- * __kprobes. But, there are cases where such functions already belong to
- * a different section (__sched for preempt_schedule)
- *
- * For such cases, we now have a blacklist
- */
-static struct kprobe_blackpoint kprobe_blacklist[] = {
- {"preempt_schedule",},
- {"native_get_debugreg",},
- {"irq_entries_start",},
- {"common_interrupt",},
- {"mcount",}, /* mcount can be called from everywhere */
- {NULL} /* Terminator */
-};
+/* Blacklist -- list of struct kprobe_blacklist_entry */
+static LIST_HEAD(kprobe_blacklist);
#ifdef __ARCH_WANT_KPROBES_INSN_SLOT
/*
@@ -112,6 +99,7 @@ static struct kprobe_blackpoint kprobe_blacklist[] = {
struct kprobe_insn_page {
struct list_head list;
kprobe_opcode_t *insns; /* Page of instruction slots */
+ struct kprobe_insn_cache *cache;
int nused;
int ngarbage;
char slot_used[];
@@ -121,12 +109,6 @@ struct kprobe_insn_page {
(offsetof(struct kprobe_insn_page, slot_used) + \
(sizeof(char) * (slots)))
-struct kprobe_insn_cache {
- struct list_head pages; /* list of kprobe_insn_page */
- size_t insn_size; /* size of instruction slot */
- int nr_garbage;
-};
-
static int slots_per_page(struct kprobe_insn_cache *c)
{
return PAGE_SIZE/(c->insn_size * sizeof(kprobe_opcode_t));
@@ -138,22 +120,36 @@ enum kprobe_slot_state {
SLOT_USED = 2,
};
-static DEFINE_MUTEX(kprobe_insn_mutex); /* Protects kprobe_insn_slots */
-static struct kprobe_insn_cache kprobe_insn_slots = {
+static void *alloc_insn_page(void)
+{
+ return module_alloc(PAGE_SIZE);
+}
+
+static void free_insn_page(void *page)
+{
+ module_free(NULL, page);
+}
+
+struct kprobe_insn_cache kprobe_insn_slots = {
+ .mutex = __MUTEX_INITIALIZER(kprobe_insn_slots.mutex),
+ .alloc = alloc_insn_page,
+ .free = free_insn_page,
.pages = LIST_HEAD_INIT(kprobe_insn_slots.pages),
.insn_size = MAX_INSN_SIZE,
.nr_garbage = 0,
};
-static int __kprobes collect_garbage_slots(struct kprobe_insn_cache *c);
+static int collect_garbage_slots(struct kprobe_insn_cache *c);
/**
* __get_insn_slot() - Find a slot on an executable page for an instruction.
* We allocate an executable page if there's no room on existing ones.
*/
-static kprobe_opcode_t __kprobes *__get_insn_slot(struct kprobe_insn_cache *c)
+kprobe_opcode_t *__get_insn_slot(struct kprobe_insn_cache *c)
{
struct kprobe_insn_page *kip;
+ kprobe_opcode_t *slot = NULL;
+ mutex_lock(&c->mutex);
retry:
list_for_each_entry(kip, &c->pages, list) {
if (kip->nused < slots_per_page(c)) {
@@ -162,7 +158,8 @@ static kprobe_opcode_t __kprobes *__get_insn_slot(struct kprobe_insn_cache *c)
if (kip->slot_used[i] == SLOT_CLEAN) {
kip->slot_used[i] = SLOT_USED;
kip->nused++;
- return kip->insns + (i * c->insn_size);
+ slot = kip->insns + (i * c->insn_size);
+ goto out;
}
}
/* kip->nused is broken. Fix it. */
@@ -178,41 +175,33 @@ static kprobe_opcode_t __kprobes *__get_insn_slot(struct kprobe_insn_cache *c)
/* All out of space. Need to allocate a new page. */
kip = kmalloc(KPROBE_INSN_PAGE_SIZE(slots_per_page(c)), GFP_KERNEL);
if (!kip)
- return NULL;
+ goto out;
/*
* Use module_alloc so this page is within +/- 2GB of where the
* kernel image and loaded module images reside. This is required
* so x86_64 can correctly handle the %rip-relative fixups.
*/
- kip->insns = module_alloc(PAGE_SIZE);
+ kip->insns = c->alloc();
if (!kip->insns) {
kfree(kip);
- return NULL;
+ goto out;
}
INIT_LIST_HEAD(&kip->list);
memset(kip->slot_used, SLOT_CLEAN, slots_per_page(c));
kip->slot_used[0] = SLOT_USED;
kip->nused = 1;
kip->ngarbage = 0;
+ kip->cache = c;
list_add(&kip->list, &c->pages);
- return kip->insns;
-}
-
-
-kprobe_opcode_t __kprobes *get_insn_slot(void)
-{
- kprobe_opcode_t *ret = NULL;
-
- mutex_lock(&kprobe_insn_mutex);
- ret = __get_insn_slot(&kprobe_insn_slots);
- mutex_unlock(&kprobe_insn_mutex);
-
- return ret;
+ slot = kip->insns;
+out:
+ mutex_unlock(&c->mutex);
+ return slot;
}
/* Return 1 if all garbages are collected, otherwise 0. */
-static int __kprobes collect_one_slot(struct kprobe_insn_page *kip, int idx)
+static int collect_one_slot(struct kprobe_insn_page *kip, int idx)
{
kip->slot_used[idx] = SLOT_CLEAN;
kip->nused--;
@@ -225,7 +214,7 @@ static int __kprobes collect_one_slot(struct kprobe_insn_page *kip, int idx)
*/
if (!list_is_singular(&kip->list)) {
list_del(&kip->list);
- module_free(NULL, kip->insns);
+ kip->cache->free(kip->insns);
kfree(kip);
}
return 1;
@@ -233,7 +222,7 @@ static int __kprobes collect_one_slot(struct kprobe_insn_page *kip, int idx)
return 0;
}
-static int __kprobes collect_garbage_slots(struct kprobe_insn_cache *c)
+static int collect_garbage_slots(struct kprobe_insn_cache *c)
{
struct kprobe_insn_page *kip, *next;
@@ -255,11 +244,12 @@ static int __kprobes collect_garbage_slots(struct kprobe_insn_cache *c)
return 0;
}
-static void __kprobes __free_insn_slot(struct kprobe_insn_cache *c,
- kprobe_opcode_t *slot, int dirty)
+void __free_insn_slot(struct kprobe_insn_cache *c,
+ kprobe_opcode_t *slot, int dirty)
{
struct kprobe_insn_page *kip;
+ mutex_lock(&c->mutex);
list_for_each_entry(kip, &c->pages, list) {
long idx = ((long)slot - (long)kip->insns) /
(c->insn_size * sizeof(kprobe_opcode_t));
@@ -272,45 +262,25 @@ static void __kprobes __free_insn_slot(struct kprobe_insn_cache *c,
collect_garbage_slots(c);
} else
collect_one_slot(kip, idx);
- return;
+ goto out;
}
}
/* Could not free this slot. */
WARN_ON(1);
+out:
+ mutex_unlock(&c->mutex);
}
-void __kprobes free_insn_slot(kprobe_opcode_t * slot, int dirty)
-{
- mutex_lock(&kprobe_insn_mutex);
- __free_insn_slot(&kprobe_insn_slots, slot, dirty);
- mutex_unlock(&kprobe_insn_mutex);
-}
#ifdef CONFIG_OPTPROBES
/* For optimized_kprobe buffer */
-static DEFINE_MUTEX(kprobe_optinsn_mutex); /* Protects kprobe_optinsn_slots */
-static struct kprobe_insn_cache kprobe_optinsn_slots = {
+struct kprobe_insn_cache kprobe_optinsn_slots = {
+ .mutex = __MUTEX_INITIALIZER(kprobe_optinsn_slots.mutex),
+ .alloc = alloc_insn_page,
+ .free = free_insn_page,
.pages = LIST_HEAD_INIT(kprobe_optinsn_slots.pages),
/* .insn_size is initialized later */
.nr_garbage = 0,
};
-/* Get a slot for optimized_kprobe buffer */
-kprobe_opcode_t __kprobes *get_optinsn_slot(void)
-{
- kprobe_opcode_t *ret = NULL;
-
- mutex_lock(&kprobe_optinsn_mutex);
- ret = __get_insn_slot(&kprobe_optinsn_slots);
- mutex_unlock(&kprobe_optinsn_mutex);
-
- return ret;
-}
-
-void __kprobes free_optinsn_slot(kprobe_opcode_t * slot, int dirty)
-{
- mutex_lock(&kprobe_optinsn_mutex);
- __free_insn_slot(&kprobe_optinsn_slots, slot, dirty);
- mutex_unlock(&kprobe_optinsn_mutex);
-}
#endif
#endif
@@ -331,22 +301,22 @@ static inline void reset_kprobe_instance(void)
* OR
* - with preemption disabled - from arch/xxx/kernel/kprobes.c
*/
-struct kprobe __kprobes *get_kprobe(void *addr)
+struct kprobe *get_kprobe(void *addr)
{
struct hlist_head *head;
- struct hlist_node *node;
struct kprobe *p;
head = &kprobe_table[hash_ptr(addr, KPROBE_HASH_BITS)];
- hlist_for_each_entry_rcu(p, node, head, hlist) {
+ hlist_for_each_entry_rcu(p, head, hlist) {
if (p->addr == addr)
return p;
}
return NULL;
}
+NOKPROBE_SYMBOL(get_kprobe);
-static int __kprobes aggr_pre_handler(struct kprobe *p, struct pt_regs *regs);
+static int aggr_pre_handler(struct kprobe *p, struct pt_regs *regs);
/* Return true if the kprobe is an aggregator */
static inline int kprobe_aggrprobe(struct kprobe *p)
@@ -378,7 +348,7 @@ static bool kprobes_allow_optimization;
* Call all pre_handler on the list, but ignores its return value.
* This must be called from arch-dep optimized caller.
*/
-void __kprobes opt_pre_handler(struct kprobe *p, struct pt_regs *regs)
+void opt_pre_handler(struct kprobe *p, struct pt_regs *regs)
{
struct kprobe *kp;
@@ -390,9 +360,10 @@ void __kprobes opt_pre_handler(struct kprobe *p, struct pt_regs *regs)
reset_kprobe_instance();
}
}
+NOKPROBE_SYMBOL(opt_pre_handler);
/* Free optimized instructions and optimized_kprobe */
-static __kprobes void free_aggr_kprobe(struct kprobe *p)
+static void free_aggr_kprobe(struct kprobe *p)
{
struct optimized_kprobe *op;
@@ -430,7 +401,7 @@ static inline int kprobe_disarmed(struct kprobe *p)
}
/* Return true(!0) if the probe is queued on (un)optimizing lists */
-static int __kprobes kprobe_queued(struct kprobe *p)
+static int kprobe_queued(struct kprobe *p)
{
struct optimized_kprobe *op;
@@ -446,7 +417,7 @@ static int __kprobes kprobe_queued(struct kprobe *p)
* Return an optimized kprobe whose optimizing code replaces
* instructions including addr (exclude breakpoint).
*/
-static struct kprobe *__kprobes get_optimized_kprobe(unsigned long addr)
+static struct kprobe *get_optimized_kprobe(unsigned long addr)
{
int i;
struct kprobe *p = NULL;
@@ -468,17 +439,17 @@ static struct kprobe *__kprobes get_optimized_kprobe(unsigned long addr)
/* Optimization staging list, protected by kprobe_mutex */
static LIST_HEAD(optimizing_list);
static LIST_HEAD(unoptimizing_list);
+static LIST_HEAD(freeing_list);
static void kprobe_optimizer(struct work_struct *work);
static DECLARE_DELAYED_WORK(optimizing_work, kprobe_optimizer);
-static DECLARE_COMPLETION(optimizer_comp);
#define OPTIMIZE_DELAY 5
/*
* Optimize (replace a breakpoint with a jump) kprobes listed on
* optimizing_list.
*/
-static __kprobes void do_optimize_kprobes(void)
+static void do_optimize_kprobes(void)
{
/* Optimization never be done when disarmed */
if (kprobes_all_disarmed || !kprobes_allow_optimization ||
@@ -506,7 +477,7 @@ static __kprobes void do_optimize_kprobes(void)
* Unoptimize (replace a jump with a breakpoint and remove the breakpoint
* if need) kprobes listed on unoptimizing_list.
*/
-static __kprobes void do_unoptimize_kprobes(struct list_head *free_list)
+static void do_unoptimize_kprobes(void)
{
struct optimized_kprobe *op, *tmp;
@@ -517,9 +488,9 @@ static __kprobes void do_unoptimize_kprobes(struct list_head *free_list)
/* Ditto to do_optimize_kprobes */
get_online_cpus();
mutex_lock(&text_mutex);
- arch_unoptimize_kprobes(&unoptimizing_list, free_list);
+ arch_unoptimize_kprobes(&unoptimizing_list, &freeing_list);
/* Loop free_list for disarming */
- list_for_each_entry_safe(op, tmp, free_list, list) {
+ list_for_each_entry_safe(op, tmp, &freeing_list, list) {
/* Disarm probes if marked disabled */
if (kprobe_disabled(&op->kp))
arch_disarm_kprobe(&op->kp);
@@ -538,11 +509,11 @@ static __kprobes void do_unoptimize_kprobes(struct list_head *free_list)
}
/* Reclaim all kprobes on the free_list */
-static __kprobes void do_free_cleaned_kprobes(struct list_head *free_list)
+static void do_free_cleaned_kprobes(void)
{
struct optimized_kprobe *op, *tmp;
- list_for_each_entry_safe(op, tmp, free_list, list) {
+ list_for_each_entry_safe(op, tmp, &freeing_list, list) {
BUG_ON(!kprobe_unused(&op->kp));
list_del_init(&op->list);
free_aggr_kprobe(&op->kp);
@@ -550,17 +521,14 @@ static __kprobes void do_free_cleaned_kprobes(struct list_head *free_list)
}
/* Start optimizer after OPTIMIZE_DELAY passed */
-static __kprobes void kick_kprobe_optimizer(void)
+static void kick_kprobe_optimizer(void)
{
- if (!delayed_work_pending(&optimizing_work))
- schedule_delayed_work(&optimizing_work, OPTIMIZE_DELAY);
+ schedule_delayed_work(&optimizing_work, OPTIMIZE_DELAY);
}
/* Kprobe jump optimizer */
-static __kprobes void kprobe_optimizer(struct work_struct *work)
+static void kprobe_optimizer(struct work_struct *work)
{
- LIST_HEAD(free_list);
-
mutex_lock(&kprobe_mutex);
/* Lock modules while optimizing kprobes */
mutex_lock(&module_mutex);
@@ -569,7 +537,7 @@ static __kprobes void kprobe_optimizer(struct work_struct *work)
* Step 1: Unoptimize kprobes and collect cleaned (unused and disarmed)
* kprobes before waiting for quiesence period.
*/
- do_unoptimize_kprobes(&free_list);
+ do_unoptimize_kprobes();
/*
* Step 2: Wait for quiesence period to ensure all running interrupts
@@ -584,7 +552,7 @@ static __kprobes void kprobe_optimizer(struct work_struct *work)
do_optimize_kprobes();
/* Step 4: Free cleaned kprobes after quiesence period */
- do_free_cleaned_kprobes(&free_list);
+ do_free_cleaned_kprobes();
mutex_unlock(&module_mutex);
mutex_unlock(&kprobe_mutex);
@@ -592,20 +560,29 @@ static __kprobes void kprobe_optimizer(struct work_struct *work)
/* Step 5: Kick optimizer again if needed */
if (!list_empty(&optimizing_list) || !list_empty(&unoptimizing_list))
kick_kprobe_optimizer();
- else
- /* Wake up all waiters */
- complete_all(&optimizer_comp);
}
/* Wait for completing optimization and unoptimization */
-static __kprobes void wait_for_kprobe_optimizer(void)
+static void wait_for_kprobe_optimizer(void)
{
- if (delayed_work_pending(&optimizing_work))
- wait_for_completion(&optimizer_comp);
+ mutex_lock(&kprobe_mutex);
+
+ while (!list_empty(&optimizing_list) || !list_empty(&unoptimizing_list)) {
+ mutex_unlock(&kprobe_mutex);
+
+ /* this will also make optimizing_work execute immmediately */
+ flush_delayed_work(&optimizing_work);
+ /* @optimizing_work might not have been queued yet, relax */
+ cpu_relax();
+
+ mutex_lock(&kprobe_mutex);
+ }
+
+ mutex_unlock(&kprobe_mutex);
}
/* Optimize kprobe if p is ready to be optimized */
-static __kprobes void optimize_kprobe(struct kprobe *p)
+static void optimize_kprobe(struct kprobe *p)
{
struct optimized_kprobe *op;
@@ -639,7 +616,7 @@ static __kprobes void optimize_kprobe(struct kprobe *p)
}
/* Short cut to direct unoptimizing */
-static __kprobes void force_unoptimize_kprobe(struct optimized_kprobe *op)
+static void force_unoptimize_kprobe(struct optimized_kprobe *op)
{
get_online_cpus();
arch_unoptimize_kprobe(op);
@@ -649,7 +626,7 @@ static __kprobes void force_unoptimize_kprobe(struct optimized_kprobe *op)
}
/* Unoptimize a kprobe if p is optimized */
-static __kprobes void unoptimize_kprobe(struct kprobe *p, bool force)
+static void unoptimize_kprobe(struct kprobe *p, bool force)
{
struct optimized_kprobe *op;
@@ -709,7 +686,7 @@ static void reuse_unused_kprobe(struct kprobe *ap)
}
/* Remove optimized instructions */
-static void __kprobes kill_optimized_kprobe(struct kprobe *p)
+static void kill_optimized_kprobe(struct kprobe *p)
{
struct optimized_kprobe *op;
@@ -717,14 +694,25 @@ static void __kprobes kill_optimized_kprobe(struct kprobe *p)
if (!list_empty(&op->list))
/* Dequeue from the (un)optimization queue */
list_del_init(&op->list);
-
op->kp.flags &= ~KPROBE_FLAG_OPTIMIZED;
+
+ if (kprobe_unused(p)) {
+ /* Enqueue if it is unused */
+ list_add(&op->list, &freeing_list);
+ /*
+ * Remove unused probes from the hash list. After waiting
+ * for synchronization, this probe is reclaimed.
+ * (reclaiming is done by do_free_cleaned_kprobes().)
+ */
+ hlist_del_rcu(&op->kp.hlist);
+ }
+
/* Don't touch the code, because it is already freed. */
arch_remove_optimized_kprobe(op);
}
/* Try to prepare optimized instructions */
-static __kprobes void prepare_optimized_kprobe(struct kprobe *p)
+static void prepare_optimized_kprobe(struct kprobe *p)
{
struct optimized_kprobe *op;
@@ -733,7 +721,7 @@ static __kprobes void prepare_optimized_kprobe(struct kprobe *p)
}
/* Allocate new optimized_kprobe and try to prepare optimized instructions */
-static __kprobes struct kprobe *alloc_aggr_kprobe(struct kprobe *p)
+static struct kprobe *alloc_aggr_kprobe(struct kprobe *p)
{
struct optimized_kprobe *op;
@@ -748,13 +736,13 @@ static __kprobes struct kprobe *alloc_aggr_kprobe(struct kprobe *p)
return &op->kp;
}
-static void __kprobes init_aggr_kprobe(struct kprobe *ap, struct kprobe *p);
+static void init_aggr_kprobe(struct kprobe *ap, struct kprobe *p);
/*
* Prepare an optimized_kprobe and optimize it
* NOTE: p must be a normal registered kprobe
*/
-static __kprobes void try_to_optimize_kprobe(struct kprobe *p)
+static void try_to_optimize_kprobe(struct kprobe *p)
{
struct kprobe *ap;
struct optimized_kprobe *op;
@@ -788,53 +776,58 @@ out:
}
#ifdef CONFIG_SYSCTL
-/* This should be called with kprobe_mutex locked */
-static void __kprobes optimize_all_kprobes(void)
+static void optimize_all_kprobes(void)
{
struct hlist_head *head;
- struct hlist_node *node;
struct kprobe *p;
unsigned int i;
+ mutex_lock(&kprobe_mutex);
/* If optimization is already allowed, just return */
if (kprobes_allow_optimization)
- return;
+ goto out;
kprobes_allow_optimization = true;
for (i = 0; i < KPROBE_TABLE_SIZE; i++) {
head = &kprobe_table[i];
- hlist_for_each_entry_rcu(p, node, head, hlist)
+ hlist_for_each_entry_rcu(p, head, hlist)
if (!kprobe_disabled(p))
optimize_kprobe(p);
}
printk(KERN_INFO "Kprobes globally optimized\n");
+out:
+ mutex_unlock(&kprobe_mutex);
}
-/* This should be called with kprobe_mutex locked */
-static void __kprobes unoptimize_all_kprobes(void)
+static void unoptimize_all_kprobes(void)
{
struct hlist_head *head;
- struct hlist_node *node;
struct kprobe *p;
unsigned int i;
+ mutex_lock(&kprobe_mutex);
/* If optimization is already prohibited, just return */
- if (!kprobes_allow_optimization)
+ if (!kprobes_allow_optimization) {
+ mutex_unlock(&kprobe_mutex);
return;
+ }
kprobes_allow_optimization = false;
for (i = 0; i < KPROBE_TABLE_SIZE; i++) {
head = &kprobe_table[i];
- hlist_for_each_entry_rcu(p, node, head, hlist) {
+ hlist_for_each_entry_rcu(p, head, hlist) {
if (!kprobe_disabled(p))
unoptimize_kprobe(p, false);
}
}
+ mutex_unlock(&kprobe_mutex);
+
/* Wait for unoptimizing completion */
wait_for_kprobe_optimizer();
printk(KERN_INFO "Kprobes globally unoptimized\n");
}
+static DEFINE_MUTEX(kprobe_sysctl_mutex);
int sysctl_kprobes_optimization;
int proc_kprobes_optimization_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *length,
@@ -842,7 +835,7 @@ int proc_kprobes_optimization_handler(struct ctl_table *table, int write,
{
int ret;
- mutex_lock(&kprobe_mutex);
+ mutex_lock(&kprobe_sysctl_mutex);
sysctl_kprobes_optimization = kprobes_allow_optimization ? 1 : 0;
ret = proc_dointvec_minmax(table, write, buffer, length, ppos);
@@ -850,14 +843,14 @@ int proc_kprobes_optimization_handler(struct ctl_table *table, int write,
optimize_all_kprobes();
else
unoptimize_all_kprobes();
- mutex_unlock(&kprobe_mutex);
+ mutex_unlock(&kprobe_sysctl_mutex);
return ret;
}
#endif /* CONFIG_SYSCTL */
/* Put a breakpoint for a probe. Must be called with text_mutex locked */
-static void __kprobes __arm_kprobe(struct kprobe *p)
+static void __arm_kprobe(struct kprobe *p)
{
struct kprobe *_p;
@@ -872,7 +865,7 @@ static void __kprobes __arm_kprobe(struct kprobe *p)
}
/* Remove the breakpoint of a probe. Must be called with text_mutex locked */
-static void __kprobes __disarm_kprobe(struct kprobe *p, bool reopt)
+static void __disarm_kprobe(struct kprobe *p, bool reopt)
{
struct kprobe *_p;
@@ -907,19 +900,19 @@ static void reuse_unused_kprobe(struct kprobe *ap)
BUG_ON(kprobe_unused(ap));
}
-static __kprobes void free_aggr_kprobe(struct kprobe *p)
+static void free_aggr_kprobe(struct kprobe *p)
{
arch_remove_kprobe(p);
kfree(p);
}
-static __kprobes struct kprobe *alloc_aggr_kprobe(struct kprobe *p)
+static struct kprobe *alloc_aggr_kprobe(struct kprobe *p)
{
return kzalloc(sizeof(struct kprobe), GFP_KERNEL);
}
#endif /* CONFIG_OPTPROBES */
-#ifdef KPROBES_CAN_USE_FTRACE
+#ifdef CONFIG_KPROBES_ON_FTRACE
static struct ftrace_ops kprobe_ftrace_ops __read_mostly = {
.func = kprobe_ftrace_handler,
.flags = FTRACE_OPS_FL_SAVE_REGS,
@@ -927,7 +920,7 @@ static struct ftrace_ops kprobe_ftrace_ops __read_mostly = {
static int kprobe_ftrace_enabled;
/* Must ensure p->addr is really on ftrace */
-static int __kprobes prepare_kprobe(struct kprobe *p)
+static int prepare_kprobe(struct kprobe *p)
{
if (!kprobe_ftrace(p))
return arch_prepare_kprobe(p);
@@ -936,7 +929,7 @@ static int __kprobes prepare_kprobe(struct kprobe *p)
}
/* Caller must lock kprobe_mutex */
-static void __kprobes arm_kprobe_ftrace(struct kprobe *p)
+static void arm_kprobe_ftrace(struct kprobe *p)
{
int ret;
@@ -951,7 +944,7 @@ static void __kprobes arm_kprobe_ftrace(struct kprobe *p)
}
/* Caller must lock kprobe_mutex */
-static void __kprobes disarm_kprobe_ftrace(struct kprobe *p)
+static void disarm_kprobe_ftrace(struct kprobe *p)
{
int ret;
@@ -964,14 +957,14 @@ static void __kprobes disarm_kprobe_ftrace(struct kprobe *p)
(unsigned long)p->addr, 1, 0);
WARN(ret < 0, "Failed to disarm kprobe-ftrace at %p (%d)\n", p->addr, ret);
}
-#else /* !KPROBES_CAN_USE_FTRACE */
+#else /* !CONFIG_KPROBES_ON_FTRACE */
#define prepare_kprobe(p) arch_prepare_kprobe(p)
#define arm_kprobe_ftrace(p) do {} while (0)
#define disarm_kprobe_ftrace(p) do {} while (0)
#endif
/* Arm a kprobe with text_mutex */
-static void __kprobes arm_kprobe(struct kprobe *kp)
+static void arm_kprobe(struct kprobe *kp)
{
if (unlikely(kprobe_ftrace(kp))) {
arm_kprobe_ftrace(kp);
@@ -988,7 +981,7 @@ static void __kprobes arm_kprobe(struct kprobe *kp)
}
/* Disarm a kprobe with text_mutex */
-static void __kprobes disarm_kprobe(struct kprobe *kp, bool reopt)
+static void disarm_kprobe(struct kprobe *kp, bool reopt)
{
if (unlikely(kprobe_ftrace(kp))) {
disarm_kprobe_ftrace(kp);
@@ -1004,7 +997,7 @@ static void __kprobes disarm_kprobe(struct kprobe *kp, bool reopt)
* Aggregate handlers for multiple kprobes support - these handlers
* take care of invoking the individual kprobe handlers on p->list
*/
-static int __kprobes aggr_pre_handler(struct kprobe *p, struct pt_regs *regs)
+static int aggr_pre_handler(struct kprobe *p, struct pt_regs *regs)
{
struct kprobe *kp;
@@ -1018,9 +1011,10 @@ static int __kprobes aggr_pre_handler(struct kprobe *p, struct pt_regs *regs)
}
return 0;
}
+NOKPROBE_SYMBOL(aggr_pre_handler);
-static void __kprobes aggr_post_handler(struct kprobe *p, struct pt_regs *regs,
- unsigned long flags)
+static void aggr_post_handler(struct kprobe *p, struct pt_regs *regs,
+ unsigned long flags)
{
struct kprobe *kp;
@@ -1032,9 +1026,10 @@ static void __kprobes aggr_post_handler(struct kprobe *p, struct pt_regs *regs,
}
}
}
+NOKPROBE_SYMBOL(aggr_post_handler);
-static int __kprobes aggr_fault_handler(struct kprobe *p, struct pt_regs *regs,
- int trapnr)
+static int aggr_fault_handler(struct kprobe *p, struct pt_regs *regs,
+ int trapnr)
{
struct kprobe *cur = __this_cpu_read(kprobe_instance);
@@ -1048,8 +1043,9 @@ static int __kprobes aggr_fault_handler(struct kprobe *p, struct pt_regs *regs,
}
return 0;
}
+NOKPROBE_SYMBOL(aggr_fault_handler);
-static int __kprobes aggr_break_handler(struct kprobe *p, struct pt_regs *regs)
+static int aggr_break_handler(struct kprobe *p, struct pt_regs *regs)
{
struct kprobe *cur = __this_cpu_read(kprobe_instance);
int ret = 0;
@@ -1061,9 +1057,10 @@ static int __kprobes aggr_break_handler(struct kprobe *p, struct pt_regs *regs)
reset_kprobe_instance();
return ret;
}
+NOKPROBE_SYMBOL(aggr_break_handler);
/* Walks the list and increments nmissed count for multiprobe case */
-void __kprobes kprobes_inc_nmissed_count(struct kprobe *p)
+void kprobes_inc_nmissed_count(struct kprobe *p)
{
struct kprobe *kp;
if (!kprobe_aggrprobe(p)) {
@@ -1074,9 +1071,10 @@ void __kprobes kprobes_inc_nmissed_count(struct kprobe *p)
}
return;
}
+NOKPROBE_SYMBOL(kprobes_inc_nmissed_count);
-void __kprobes recycle_rp_inst(struct kretprobe_instance *ri,
- struct hlist_head *head)
+void recycle_rp_inst(struct kretprobe_instance *ri,
+ struct hlist_head *head)
{
struct kretprobe *rp = ri->rp;
@@ -1091,8 +1089,9 @@ void __kprobes recycle_rp_inst(struct kretprobe_instance *ri,
/* Unregistering */
hlist_add_head(&ri->hlist, head);
}
+NOKPROBE_SYMBOL(recycle_rp_inst);
-void __kprobes kretprobe_hash_lock(struct task_struct *tsk,
+void kretprobe_hash_lock(struct task_struct *tsk,
struct hlist_head **head, unsigned long *flags)
__acquires(hlist_lock)
{
@@ -1103,17 +1102,19 @@ __acquires(hlist_lock)
hlist_lock = kretprobe_table_lock_ptr(hash);
raw_spin_lock_irqsave(hlist_lock, *flags);
}
+NOKPROBE_SYMBOL(kretprobe_hash_lock);
-static void __kprobes kretprobe_table_lock(unsigned long hash,
- unsigned long *flags)
+static void kretprobe_table_lock(unsigned long hash,
+ unsigned long *flags)
__acquires(hlist_lock)
{
raw_spinlock_t *hlist_lock = kretprobe_table_lock_ptr(hash);
raw_spin_lock_irqsave(hlist_lock, *flags);
}
+NOKPROBE_SYMBOL(kretprobe_table_lock);
-void __kprobes kretprobe_hash_unlock(struct task_struct *tsk,
- unsigned long *flags)
+void kretprobe_hash_unlock(struct task_struct *tsk,
+ unsigned long *flags)
__releases(hlist_lock)
{
unsigned long hash = hash_ptr(tsk, KPROBE_HASH_BITS);
@@ -1122,14 +1123,16 @@ __releases(hlist_lock)
hlist_lock = kretprobe_table_lock_ptr(hash);
raw_spin_unlock_irqrestore(hlist_lock, *flags);
}
+NOKPROBE_SYMBOL(kretprobe_hash_unlock);
-static void __kprobes kretprobe_table_unlock(unsigned long hash,
- unsigned long *flags)
+static void kretprobe_table_unlock(unsigned long hash,
+ unsigned long *flags)
__releases(hlist_lock)
{
raw_spinlock_t *hlist_lock = kretprobe_table_lock_ptr(hash);
raw_spin_unlock_irqrestore(hlist_lock, *flags);
}
+NOKPROBE_SYMBOL(kretprobe_table_unlock);
/*
* This function is called from finish_task_switch when task tk becomes dead,
@@ -1137,11 +1140,11 @@ __releases(hlist_lock)
* with this task. These left over instances represent probed functions
* that have been called but will never return.
*/
-void __kprobes kprobe_flush_task(struct task_struct *tk)
+void kprobe_flush_task(struct task_struct *tk)
{
struct kretprobe_instance *ri;
struct hlist_head *head, empty_rp;
- struct hlist_node *node, *tmp;
+ struct hlist_node *tmp;
unsigned long hash, flags = 0;
if (unlikely(!kprobes_initialized))
@@ -1152,40 +1155,41 @@ void __kprobes kprobe_flush_task(struct task_struct *tk)
hash = hash_ptr(tk, KPROBE_HASH_BITS);
head = &kretprobe_inst_table[hash];
kretprobe_table_lock(hash, &flags);
- hlist_for_each_entry_safe(ri, node, tmp, head, hlist) {
+ hlist_for_each_entry_safe(ri, tmp, head, hlist) {
if (ri->task == tk)
recycle_rp_inst(ri, &empty_rp);
}
kretprobe_table_unlock(hash, &flags);
- hlist_for_each_entry_safe(ri, node, tmp, &empty_rp, hlist) {
+ hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) {
hlist_del(&ri->hlist);
kfree(ri);
}
}
+NOKPROBE_SYMBOL(kprobe_flush_task);
static inline void free_rp_inst(struct kretprobe *rp)
{
struct kretprobe_instance *ri;
- struct hlist_node *pos, *next;
+ struct hlist_node *next;
- hlist_for_each_entry_safe(ri, pos, next, &rp->free_instances, hlist) {
+ hlist_for_each_entry_safe(ri, next, &rp->free_instances, hlist) {
hlist_del(&ri->hlist);
kfree(ri);
}
}
-static void __kprobes cleanup_rp_inst(struct kretprobe *rp)
+static void cleanup_rp_inst(struct kretprobe *rp)
{
unsigned long flags, hash;
struct kretprobe_instance *ri;
- struct hlist_node *pos, *next;
+ struct hlist_node *next;
struct hlist_head *head;
/* No race here */
for (hash = 0; hash < KPROBE_TABLE_SIZE; hash++) {
kretprobe_table_lock(hash, &flags);
head = &kretprobe_inst_table[hash];
- hlist_for_each_entry_safe(ri, pos, next, head, hlist) {
+ hlist_for_each_entry_safe(ri, next, head, hlist) {
if (ri->rp == rp)
ri->rp = NULL;
}
@@ -1193,12 +1197,13 @@ static void __kprobes cleanup_rp_inst(struct kretprobe *rp)
}
free_rp_inst(rp);
}
+NOKPROBE_SYMBOL(cleanup_rp_inst);
/*
* Add the new probe to ap->list. Fail if this is the
* second jprobe at the address - two jprobes can't coexist
*/
-static int __kprobes add_new_kprobe(struct kprobe *ap, struct kprobe *p)
+static int add_new_kprobe(struct kprobe *ap, struct kprobe *p)
{
BUG_ON(kprobe_gone(ap) || kprobe_gone(p));
@@ -1222,7 +1227,7 @@ static int __kprobes add_new_kprobe(struct kprobe *ap, struct kprobe *p)
* Fill in the required fields of the "manager kprobe". Replace the
* earlier kprobe in the hlist with the manager kprobe
*/
-static void __kprobes init_aggr_kprobe(struct kprobe *ap, struct kprobe *p)
+static void init_aggr_kprobe(struct kprobe *ap, struct kprobe *p)
{
/* Copy p's insn slot to ap */
copy_kprobe(p, ap);
@@ -1248,8 +1253,7 @@ static void __kprobes init_aggr_kprobe(struct kprobe *ap, struct kprobe *p)
* This is the second or subsequent kprobe at the address - handle
* the intricacies
*/
-static int __kprobes register_aggr_kprobe(struct kprobe *orig_p,
- struct kprobe *p)
+static int register_aggr_kprobe(struct kprobe *orig_p, struct kprobe *p)
{
int ret = 0;
struct kprobe *ap = orig_p;
@@ -1320,25 +1324,29 @@ out:
return ret;
}
-static int __kprobes in_kprobes_functions(unsigned long addr)
+bool __weak arch_within_kprobe_blacklist(unsigned long addr)
+{
+ /* The __kprobes marked functions and entry code must not be probed */
+ return addr >= (unsigned long)__kprobes_text_start &&
+ addr < (unsigned long)__kprobes_text_end;
+}
+
+static bool within_kprobe_blacklist(unsigned long addr)
{
- struct kprobe_blackpoint *kb;
+ struct kprobe_blacklist_entry *ent;
- if (addr >= (unsigned long)__kprobes_text_start &&
- addr < (unsigned long)__kprobes_text_end)
- return -EINVAL;
+ if (arch_within_kprobe_blacklist(addr))
+ return true;
/*
* If there exists a kprobe_blacklist, verify and
* fail any probe registration in the prohibited area
*/
- for (kb = kprobe_blacklist; kb->name != NULL; kb++) {
- if (kb->start_addr) {
- if (addr >= kb->start_addr &&
- addr < (kb->start_addr + kb->range))
- return -EINVAL;
- }
+ list_for_each_entry(ent, &kprobe_blacklist, list) {
+ if (addr >= ent->start_addr && addr < ent->end_addr)
+ return true;
}
- return 0;
+
+ return false;
}
/*
@@ -1347,7 +1355,7 @@ static int __kprobes in_kprobes_functions(unsigned long addr)
* This returns encoded errors if it fails to look up symbol or invalid
* combination of parameters.
*/
-static kprobe_opcode_t __kprobes *kprobe_addr(struct kprobe *p)
+static kprobe_opcode_t *kprobe_addr(struct kprobe *p)
{
kprobe_opcode_t *addr = p->addr;
@@ -1370,7 +1378,7 @@ invalid:
}
/* Check passed kprobe is valid and return kprobe in kprobe_table. */
-static struct kprobe * __kprobes __get_valid_kprobe(struct kprobe *p)
+static struct kprobe *__get_valid_kprobe(struct kprobe *p)
{
struct kprobe *ap, *list_p;
@@ -1402,8 +1410,8 @@ static inline int check_kprobe_rereg(struct kprobe *p)
return ret;
}
-static __kprobes int check_kprobe_address_safe(struct kprobe *p,
- struct module **probed_mod)
+static int check_kprobe_address_safe(struct kprobe *p,
+ struct module **probed_mod)
{
int ret = 0;
unsigned long ftrace_addr;
@@ -1414,12 +1422,12 @@ static __kprobes int check_kprobe_address_safe(struct kprobe *p,
*/
ftrace_addr = ftrace_location((unsigned long)p->addr);
if (ftrace_addr) {
-#ifdef KPROBES_CAN_USE_FTRACE
+#ifdef CONFIG_KPROBES_ON_FTRACE
/* Given address is not on the instruction boundary */
if ((unsigned long)p->addr != ftrace_addr)
return -EILSEQ;
p->flags |= KPROBE_FLAG_FTRACE;
-#else /* !KPROBES_CAN_USE_FTRACE */
+#else /* !CONFIG_KPROBES_ON_FTRACE */
return -EINVAL;
#endif
}
@@ -1429,7 +1437,7 @@ static __kprobes int check_kprobe_address_safe(struct kprobe *p,
/* Ensure it is not in reserved area nor out of text */
if (!kernel_text_address((unsigned long) p->addr) ||
- in_kprobes_functions((unsigned long) p->addr) ||
+ within_kprobe_blacklist((unsigned long) p->addr) ||
jump_label_text_reserved(p->addr, p->addr)) {
ret = -EINVAL;
goto out;
@@ -1465,7 +1473,7 @@ out:
return ret;
}
-int __kprobes register_kprobe(struct kprobe *p)
+int register_kprobe(struct kprobe *p)
{
int ret;
struct kprobe *old_p;
@@ -1527,7 +1535,7 @@ out:
EXPORT_SYMBOL_GPL(register_kprobe);
/* Check if all probes on the aggrprobe are disabled */
-static int __kprobes aggr_kprobe_disabled(struct kprobe *ap)
+static int aggr_kprobe_disabled(struct kprobe *ap)
{
struct kprobe *kp;
@@ -1543,7 +1551,7 @@ static int __kprobes aggr_kprobe_disabled(struct kprobe *ap)
}
/* Disable one kprobe: Make sure called under kprobe_mutex is locked */
-static struct kprobe *__kprobes __disable_kprobe(struct kprobe *p)
+static struct kprobe *__disable_kprobe(struct kprobe *p)
{
struct kprobe *orig_p;
@@ -1570,7 +1578,7 @@ static struct kprobe *__kprobes __disable_kprobe(struct kprobe *p)
/*
* Unregister a kprobe without a scheduler synchronization.
*/
-static int __kprobes __unregister_kprobe_top(struct kprobe *p)
+static int __unregister_kprobe_top(struct kprobe *p)
{
struct kprobe *ap, *list_p;
@@ -1627,7 +1635,7 @@ disarmed:
return 0;
}
-static void __kprobes __unregister_kprobe_bottom(struct kprobe *p)
+static void __unregister_kprobe_bottom(struct kprobe *p)
{
struct kprobe *ap;
@@ -1643,7 +1651,7 @@ static void __kprobes __unregister_kprobe_bottom(struct kprobe *p)
/* Otherwise, do nothing. */
}
-int __kprobes register_kprobes(struct kprobe **kps, int num)
+int register_kprobes(struct kprobe **kps, int num)
{
int i, ret = 0;
@@ -1661,13 +1669,13 @@ int __kprobes register_kprobes(struct kprobe **kps, int num)
}
EXPORT_SYMBOL_GPL(register_kprobes);
-void __kprobes unregister_kprobe(struct kprobe *p)
+void unregister_kprobe(struct kprobe *p)
{
unregister_kprobes(&p, 1);
}
EXPORT_SYMBOL_GPL(unregister_kprobe);
-void __kprobes unregister_kprobes(struct kprobe **kps, int num)
+void unregister_kprobes(struct kprobe **kps, int num)
{
int i;
@@ -1696,7 +1704,7 @@ unsigned long __weak arch_deref_entry_point(void *entry)
return (unsigned long)entry;
}
-int __kprobes register_jprobes(struct jprobe **jps, int num)
+int register_jprobes(struct jprobe **jps, int num)
{
struct jprobe *jp;
int ret = 0, i;
@@ -1727,19 +1735,19 @@ int __kprobes register_jprobes(struct jprobe **jps, int num)
}
EXPORT_SYMBOL_GPL(register_jprobes);
-int __kprobes register_jprobe(struct jprobe *jp)
+int register_jprobe(struct jprobe *jp)
{
return register_jprobes(&jp, 1);
}
EXPORT_SYMBOL_GPL(register_jprobe);
-void __kprobes unregister_jprobe(struct jprobe *jp)
+void unregister_jprobe(struct jprobe *jp)
{
unregister_jprobes(&jp, 1);
}
EXPORT_SYMBOL_GPL(unregister_jprobe);
-void __kprobes unregister_jprobes(struct jprobe **jps, int num)
+void unregister_jprobes(struct jprobe **jps, int num)
{
int i;
@@ -1764,8 +1772,7 @@ EXPORT_SYMBOL_GPL(unregister_jprobes);
* This kprobe pre_handler is registered with every kretprobe. When probe
* hits it will set up the return probe.
*/
-static int __kprobes pre_handler_kretprobe(struct kprobe *p,
- struct pt_regs *regs)
+static int pre_handler_kretprobe(struct kprobe *p, struct pt_regs *regs)
{
struct kretprobe *rp = container_of(p, struct kretprobe, kp);
unsigned long hash, flags = 0;
@@ -1803,8 +1810,9 @@ static int __kprobes pre_handler_kretprobe(struct kprobe *p,
}
return 0;
}
+NOKPROBE_SYMBOL(pre_handler_kretprobe);
-int __kprobes register_kretprobe(struct kretprobe *rp)
+int register_kretprobe(struct kretprobe *rp)
{
int ret = 0;
struct kretprobe_instance *inst;
@@ -1857,7 +1865,7 @@ int __kprobes register_kretprobe(struct kretprobe *rp)
}
EXPORT_SYMBOL_GPL(register_kretprobe);
-int __kprobes register_kretprobes(struct kretprobe **rps, int num)
+int register_kretprobes(struct kretprobe **rps, int num)
{
int ret = 0, i;
@@ -1875,13 +1883,13 @@ int __kprobes register_kretprobes(struct kretprobe **rps, int num)
}
EXPORT_SYMBOL_GPL(register_kretprobes);
-void __kprobes unregister_kretprobe(struct kretprobe *rp)
+void unregister_kretprobe(struct kretprobe *rp)
{
unregister_kretprobes(&rp, 1);
}
EXPORT_SYMBOL_GPL(unregister_kretprobe);
-void __kprobes unregister_kretprobes(struct kretprobe **rps, int num)
+void unregister_kretprobes(struct kretprobe **rps, int num)
{
int i;
@@ -1904,38 +1912,38 @@ void __kprobes unregister_kretprobes(struct kretprobe **rps, int num)
EXPORT_SYMBOL_GPL(unregister_kretprobes);
#else /* CONFIG_KRETPROBES */
-int __kprobes register_kretprobe(struct kretprobe *rp)
+int register_kretprobe(struct kretprobe *rp)
{
return -ENOSYS;
}
EXPORT_SYMBOL_GPL(register_kretprobe);
-int __kprobes register_kretprobes(struct kretprobe **rps, int num)
+int register_kretprobes(struct kretprobe **rps, int num)
{
return -ENOSYS;
}
EXPORT_SYMBOL_GPL(register_kretprobes);
-void __kprobes unregister_kretprobe(struct kretprobe *rp)
+void unregister_kretprobe(struct kretprobe *rp)
{
}
EXPORT_SYMBOL_GPL(unregister_kretprobe);
-void __kprobes unregister_kretprobes(struct kretprobe **rps, int num)
+void unregister_kretprobes(struct kretprobe **rps, int num)
{
}
EXPORT_SYMBOL_GPL(unregister_kretprobes);
-static int __kprobes pre_handler_kretprobe(struct kprobe *p,
- struct pt_regs *regs)
+static int pre_handler_kretprobe(struct kprobe *p, struct pt_regs *regs)
{
return 0;
}
+NOKPROBE_SYMBOL(pre_handler_kretprobe);
#endif /* CONFIG_KRETPROBES */
/* Set the kprobe gone and remove its instruction buffer. */
-static void __kprobes kill_kprobe(struct kprobe *p)
+static void kill_kprobe(struct kprobe *p)
{
struct kprobe *kp;
@@ -1959,7 +1967,7 @@ static void __kprobes kill_kprobe(struct kprobe *p)
}
/* Disable one kprobe */
-int __kprobes disable_kprobe(struct kprobe *kp)
+int disable_kprobe(struct kprobe *kp)
{
int ret = 0;
@@ -1975,7 +1983,7 @@ int __kprobes disable_kprobe(struct kprobe *kp)
EXPORT_SYMBOL_GPL(disable_kprobe);
/* Enable one kprobe */
-int __kprobes enable_kprobe(struct kprobe *kp)
+int enable_kprobe(struct kprobe *kp)
{
int ret = 0;
struct kprobe *p;
@@ -2008,20 +2016,56 @@ out:
}
EXPORT_SYMBOL_GPL(enable_kprobe);
-void __kprobes dump_kprobe(struct kprobe *kp)
+void dump_kprobe(struct kprobe *kp)
{
printk(KERN_WARNING "Dumping kprobe:\n");
printk(KERN_WARNING "Name: %s\nAddress: %p\nOffset: %x\n",
kp->symbol_name, kp->addr, kp->offset);
}
+NOKPROBE_SYMBOL(dump_kprobe);
+
+/*
+ * Lookup and populate the kprobe_blacklist.
+ *
+ * Unlike the kretprobe blacklist, we'll need to determine
+ * the range of addresses that belong to the said functions,
+ * since a kprobe need not necessarily be at the beginning
+ * of a function.
+ */
+static int __init populate_kprobe_blacklist(unsigned long *start,
+ unsigned long *end)
+{
+ unsigned long *iter;
+ struct kprobe_blacklist_entry *ent;
+ unsigned long entry, offset = 0, size = 0;
+
+ for (iter = start; iter < end; iter++) {
+ entry = arch_deref_entry_point((void *)*iter);
+
+ if (!kernel_text_address(entry) ||
+ !kallsyms_lookup_size_offset(entry, &size, &offset)) {
+ pr_err("Failed to find blacklist at %p\n",
+ (void *)entry);
+ continue;
+ }
+
+ ent = kmalloc(sizeof(*ent), GFP_KERNEL);
+ if (!ent)
+ return -ENOMEM;
+ ent->start_addr = entry;
+ ent->end_addr = entry + size;
+ INIT_LIST_HEAD(&ent->list);
+ list_add_tail(&ent->list, &kprobe_blacklist);
+ }
+ return 0;
+}
/* Module notifier call back, checking kprobes on the module */
-static int __kprobes kprobes_module_callback(struct notifier_block *nb,
- unsigned long val, void *data)
+static int kprobes_module_callback(struct notifier_block *nb,
+ unsigned long val, void *data)
{
struct module *mod = data;
struct hlist_head *head;
- struct hlist_node *node;
struct kprobe *p;
unsigned int i;
int checkcore = (val == MODULE_STATE_GOING);
@@ -2038,7 +2082,7 @@ static int __kprobes kprobes_module_callback(struct notifier_block *nb,
mutex_lock(&kprobe_mutex);
for (i = 0; i < KPROBE_TABLE_SIZE; i++) {
head = &kprobe_table[i];
- hlist_for_each_entry_rcu(p, node, head, hlist)
+ hlist_for_each_entry_rcu(p, head, hlist)
if (within_module_init((unsigned long)p->addr, mod) ||
(checkcore &&
within_module_core((unsigned long)p->addr, mod))) {
@@ -2059,14 +2103,13 @@ static struct notifier_block kprobe_module_nb = {
.priority = 0
};
+/* Markers of _kprobe_blacklist section */
+extern unsigned long __start_kprobe_blacklist[];
+extern unsigned long __stop_kprobe_blacklist[];
+
static int __init init_kprobes(void)
{
int i, err = 0;
- unsigned long offset = 0, size = 0;
- char *modname, namebuf[128];
- const char *symbol_name;
- void *addr;
- struct kprobe_blackpoint *kb;
/* FIXME allocate the probe table, currently defined statically */
/* initialize all list heads */
@@ -2076,26 +2119,11 @@ static int __init init_kprobes(void)
raw_spin_lock_init(&(kretprobe_table_locks[i].lock));
}
- /*
- * Lookup and populate the kprobe_blacklist.
- *
- * Unlike the kretprobe blacklist, we'll need to determine
- * the range of addresses that belong to the said functions,
- * since a kprobe need not necessarily be at the beginning
- * of a function.
- */
- for (kb = kprobe_blacklist; kb->name != NULL; kb++) {
- kprobe_lookup_name(kb->name, addr);
- if (!addr)
- continue;
-
- kb->start_addr = (unsigned long)addr;
- symbol_name = kallsyms_lookup(kb->start_addr,
- &size, &offset, &modname, namebuf);
- if (!symbol_name)
- kb->range = 0;
- else
- kb->range = size;
+ err = populate_kprobe_blacklist(__start_kprobe_blacklist,
+ __stop_kprobe_blacklist);
+ if (err) {
+ pr_err("kprobes: failed to populate blacklist: %d\n", err);
+ pr_err("Please take care of using kprobes.\n");
}
if (kretprobe_blacklist_size) {
@@ -2135,7 +2163,7 @@ static int __init init_kprobes(void)
}
#ifdef CONFIG_DEBUG_FS
-static void __kprobes report_probe(struct seq_file *pi, struct kprobe *p,
+static void report_probe(struct seq_file *pi, struct kprobe *p,
const char *sym, int offset, char *modname, struct kprobe *pp)
{
char *kprobe_type;
@@ -2164,12 +2192,12 @@ static void __kprobes report_probe(struct seq_file *pi, struct kprobe *p,
(kprobe_ftrace(pp) ? "[FTRACE]" : ""));
}
-static void __kprobes *kprobe_seq_start(struct seq_file *f, loff_t *pos)
+static void *kprobe_seq_start(struct seq_file *f, loff_t *pos)
{
return (*pos < KPROBE_TABLE_SIZE) ? pos : NULL;
}
-static void __kprobes *kprobe_seq_next(struct seq_file *f, void *v, loff_t *pos)
+static void *kprobe_seq_next(struct seq_file *f, void *v, loff_t *pos)
{
(*pos)++;
if (*pos >= KPROBE_TABLE_SIZE)
@@ -2177,24 +2205,23 @@ static void __kprobes *kprobe_seq_next(struct seq_file *f, void *v, loff_t *pos)
return pos;
}
-static void __kprobes kprobe_seq_stop(struct seq_file *f, void *v)
+static void kprobe_seq_stop(struct seq_file *f, void *v)
{
/* Nothing to do */
}
-static int __kprobes show_kprobe_addr(struct seq_file *pi, void *v)
+static int show_kprobe_addr(struct seq_file *pi, void *v)
{
struct hlist_head *head;
- struct hlist_node *node;
struct kprobe *p, *kp;
const char *sym = NULL;
unsigned int i = *(loff_t *) v;
unsigned long offset = 0;
- char *modname, namebuf[128];
+ char *modname, namebuf[KSYM_NAME_LEN];
head = &kprobe_table[i];
preempt_disable();
- hlist_for_each_entry_rcu(p, node, head, hlist) {
+ hlist_for_each_entry_rcu(p, head, hlist) {
sym = kallsyms_lookup((unsigned long)p->addr, NULL,
&offset, &modname, namebuf);
if (kprobe_aggrprobe(p)) {
@@ -2214,7 +2241,7 @@ static const struct seq_operations kprobes_seq_ops = {
.show = show_kprobe_addr
};
-static int __kprobes kprobes_open(struct inode *inode, struct file *filp)
+static int kprobes_open(struct inode *inode, struct file *filp)
{
return seq_open(filp, &kprobes_seq_ops);
}
@@ -2226,10 +2253,49 @@ static const struct file_operations debugfs_kprobes_operations = {
.release = seq_release,
};
-static void __kprobes arm_all_kprobes(void)
+/* kprobes/blacklist -- shows which functions can not be probed */
+static void *kprobe_blacklist_seq_start(struct seq_file *m, loff_t *pos)
+{
+ return seq_list_start(&kprobe_blacklist, *pos);
+}
+
+static void *kprobe_blacklist_seq_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ return seq_list_next(v, &kprobe_blacklist, pos);
+}
+
+static int kprobe_blacklist_seq_show(struct seq_file *m, void *v)
+{
+ struct kprobe_blacklist_entry *ent =
+ list_entry(v, struct kprobe_blacklist_entry, list);
+
+ seq_printf(m, "0x%p-0x%p\t%ps\n", (void *)ent->start_addr,
+ (void *)ent->end_addr, (void *)ent->start_addr);
+ return 0;
+}
+
+static const struct seq_operations kprobe_blacklist_seq_ops = {
+ .start = kprobe_blacklist_seq_start,
+ .next = kprobe_blacklist_seq_next,
+ .stop = kprobe_seq_stop, /* Reuse void function */
+ .show = kprobe_blacklist_seq_show,
+};
+
+static int kprobe_blacklist_open(struct inode *inode, struct file *filp)
+{
+ return seq_open(filp, &kprobe_blacklist_seq_ops);
+}
+
+static const struct file_operations debugfs_kprobe_blacklist_ops = {
+ .open = kprobe_blacklist_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+static void arm_all_kprobes(void)
{
struct hlist_head *head;
- struct hlist_node *node;
struct kprobe *p;
unsigned int i;
@@ -2242,7 +2308,7 @@ static void __kprobes arm_all_kprobes(void)
/* Arming kprobes doesn't optimize kprobe itself */
for (i = 0; i < KPROBE_TABLE_SIZE; i++) {
head = &kprobe_table[i];
- hlist_for_each_entry_rcu(p, node, head, hlist)
+ hlist_for_each_entry_rcu(p, head, hlist)
if (!kprobe_disabled(p))
arm_kprobe(p);
}
@@ -2255,10 +2321,9 @@ already_enabled:
return;
}
-static void __kprobes disarm_all_kprobes(void)
+static void disarm_all_kprobes(void)
{
struct hlist_head *head;
- struct hlist_node *node;
struct kprobe *p;
unsigned int i;
@@ -2275,7 +2340,7 @@ static void __kprobes disarm_all_kprobes(void)
for (i = 0; i < KPROBE_TABLE_SIZE; i++) {
head = &kprobe_table[i];
- hlist_for_each_entry_rcu(p, node, head, hlist) {
+ hlist_for_each_entry_rcu(p, head, hlist) {
if (!arch_trampoline_kprobe(p) && !kprobe_disabled(p))
disarm_kprobe(p, false);
}
@@ -2315,6 +2380,7 @@ static ssize_t write_enabled_file_bool(struct file *file,
if (copy_from_user(buf, user_buf, buf_size))
return -EFAULT;
+ buf[buf_size] = '\0';
switch (buf[0]) {
case 'y':
case 'Y':
@@ -2326,6 +2392,8 @@ static ssize_t write_enabled_file_bool(struct file *file,
case '0':
disarm_all_kprobes();
break;
+ default:
+ return -EINVAL;
}
return count;
@@ -2337,7 +2405,7 @@ static const struct file_operations fops_kp = {
.llseek = default_llseek,
};
-static int __kprobes debugfs_kprobe_init(void)
+static int __init debugfs_kprobe_init(void)
{
struct dentry *dir, *file;
unsigned int value = 1;
@@ -2348,19 +2416,24 @@ static int __kprobes debugfs_kprobe_init(void)
file = debugfs_create_file("list", 0444, dir, NULL,
&debugfs_kprobes_operations);
- if (!file) {
- debugfs_remove(dir);
- return -ENOMEM;
- }
+ if (!file)
+ goto error;
file = debugfs_create_file("enabled", 0600, dir,
&value, &fops_kp);
- if (!file) {
- debugfs_remove(dir);
- return -ENOMEM;
- }
+ if (!file)
+ goto error;
+
+ file = debugfs_create_file("blacklist", 0444, dir, NULL,
+ &debugfs_kprobe_blacklist_ops);
+ if (!file)
+ goto error;
return 0;
+
+error:
+ debugfs_remove(dir);
+ return -ENOMEM;
}
late_initcall(debugfs_kprobe_init);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 16:09:07 +0000