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authorMasami Hiramatsu <mhiramat@redhat.com>2009-01-06 14:41:50 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-06 15:59:20 -0800
commit129415607845d4daea11ddcba706005c69dcb942 (patch)
tree9046ea79a0b81c8823b9d42f00fd7c158861ed5c
parenta06f6211ef9b1785922f9d0e8766d63ac4e66de1 (diff)
downloadop-kernel-dev-129415607845d4daea11ddcba706005c69dcb942.zip
op-kernel-dev-129415607845d4daea11ddcba706005c69dcb942.tar.gz
kprobes: add kprobe_insn_mutex and cleanup arch_remove_kprobe()
Add kprobe_insn_mutex for protecting kprobe_insn_pages hlist, and remove kprobe_mutex from architecture dependent code. This allows us to call arch_remove_kprobe() (and free_insn_slot) while holding kprobe_mutex. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/arm/kernel/kprobes.c2
-rw-r--r--arch/ia64/kernel/kprobes.c8
-rw-r--r--arch/powerpc/kernel/kprobes.c7
-rw-r--r--arch/s390/kernel/kprobes.c7
-rw-r--r--arch/x86/kernel/kprobes.c7
-rw-r--r--include/linux/kprobes.h1
-rw-r--r--kernel/kprobes.c25
7 files changed, 38 insertions, 19 deletions
diff --git a/arch/arm/kernel/kprobes.c b/arch/arm/kernel/kprobes.c
index 3f9abe0..f692efd 100644
--- a/arch/arm/kernel/kprobes.c
+++ b/arch/arm/kernel/kprobes.c
@@ -92,9 +92,7 @@ void __kprobes arch_disarm_kprobe(struct kprobe *p)
void __kprobes arch_remove_kprobe(struct kprobe *p)
{
if (p->ainsn.insn) {
- mutex_lock(&kprobe_mutex);
free_insn_slot(p->ainsn.insn, 0);
- mutex_unlock(&kprobe_mutex);
p->ainsn.insn = NULL;
}
}
diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c
index f07688d..097b84d 100644
--- a/arch/ia64/kernel/kprobes.c
+++ b/arch/ia64/kernel/kprobes.c
@@ -670,9 +670,11 @@ void __kprobes arch_disarm_kprobe(struct kprobe *p)
void __kprobes arch_remove_kprobe(struct kprobe *p)
{
- mutex_lock(&kprobe_mutex);
- free_insn_slot(p->ainsn.insn, p->ainsn.inst_flag & INST_FLAG_BOOSTABLE);
- mutex_unlock(&kprobe_mutex);
+ if (p->ainsn.insn) {
+ free_insn_slot(p->ainsn.insn,
+ p->ainsn.inst_flag & INST_FLAG_BOOSTABLE);
+ p->ainsn.insn = NULL;
+ }
}
/*
* We are resuming execution after a single step fault, so the pt_regs
diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
index de79915..989edcd 100644
--- a/arch/powerpc/kernel/kprobes.c
+++ b/arch/powerpc/kernel/kprobes.c
@@ -96,9 +96,10 @@ void __kprobes arch_disarm_kprobe(struct kprobe *p)
void __kprobes arch_remove_kprobe(struct kprobe *p)
{
- mutex_lock(&kprobe_mutex);
- free_insn_slot(p->ainsn.insn, 0);
- mutex_unlock(&kprobe_mutex);
+ if (p->ainsn.insn) {
+ free_insn_slot(p->ainsn.insn, 0);
+ p->ainsn.insn = NULL;
+ }
}
static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
diff --git a/arch/s390/kernel/kprobes.c b/arch/s390/kernel/kprobes.c
index 569079e..9b92856 100644
--- a/arch/s390/kernel/kprobes.c
+++ b/arch/s390/kernel/kprobes.c
@@ -218,9 +218,10 @@ void __kprobes arch_disarm_kprobe(struct kprobe *p)
void __kprobes arch_remove_kprobe(struct kprobe *p)
{
- mutex_lock(&kprobe_mutex);
- free_insn_slot(p->ainsn.insn, 0);
- mutex_unlock(&kprobe_mutex);
+ if (p->ainsn.insn) {
+ free_insn_slot(p->ainsn.insn, 0);
+ p->ainsn.insn = NULL;
+ }
}
static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
diff --git a/arch/x86/kernel/kprobes.c b/arch/x86/kernel/kprobes.c
index 6c27679..eead6f8 100644
--- a/arch/x86/kernel/kprobes.c
+++ b/arch/x86/kernel/kprobes.c
@@ -376,9 +376,10 @@ void __kprobes arch_disarm_kprobe(struct kprobe *p)
void __kprobes arch_remove_kprobe(struct kprobe *p)
{
- mutex_lock(&kprobe_mutex);
- free_insn_slot(p->ainsn.insn, (p->ainsn.boostable == 1));
- mutex_unlock(&kprobe_mutex);
+ if (p->ainsn.insn) {
+ free_insn_slot(p->ainsn.insn, (p->ainsn.boostable == 1));
+ p->ainsn.insn = NULL;
+ }
}
static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 497b1d1..b93e44c 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -201,7 +201,6 @@ static inline int init_test_probes(void)
}
#endif /* CONFIG_KPROBES_SANITY_TEST */
-extern struct mutex kprobe_mutex;
extern int arch_prepare_kprobe(struct kprobe *p);
extern void arch_arm_kprobe(struct kprobe *p);
extern void arch_disarm_kprobe(struct kprobe *p);
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 3afd354..29e8792 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -69,7 +69,7 @@ static struct hlist_head kretprobe_inst_table[KPROBE_TABLE_SIZE];
/* NOTE: change this value only with kprobe_mutex held */
static bool kprobe_enabled;
-DEFINE_MUTEX(kprobe_mutex); /* Protects kprobe_table */
+static DEFINE_MUTEX(kprobe_mutex); /* Protects kprobe_table */
static DEFINE_PER_CPU(struct kprobe *, kprobe_instance) = NULL;
static struct {
spinlock_t lock ____cacheline_aligned_in_smp;
@@ -115,6 +115,7 @@ enum kprobe_slot_state {
SLOT_USED = 2,
};
+static DEFINE_MUTEX(kprobe_insn_mutex); /* Protects kprobe_insn_pages */
static struct hlist_head kprobe_insn_pages;
static int kprobe_garbage_slots;
static int collect_garbage_slots(void);
@@ -144,10 +145,10 @@ loop_end:
}
/**
- * get_insn_slot() - Find a slot on an executable page for an instruction.
+ * __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.
*/
-kprobe_opcode_t __kprobes *get_insn_slot(void)
+static kprobe_opcode_t __kprobes *__get_insn_slot(void)
{
struct kprobe_insn_page *kip;
struct hlist_node *pos;
@@ -196,6 +197,15 @@ kprobe_opcode_t __kprobes *get_insn_slot(void)
return kip->insns;
}
+kprobe_opcode_t __kprobes *get_insn_slot(void)
+{
+ kprobe_opcode_t *ret;
+ mutex_lock(&kprobe_insn_mutex);
+ ret = __get_insn_slot();
+ mutex_unlock(&kprobe_insn_mutex);
+ return ret;
+}
+
/* Return 1 if all garbages are collected, otherwise 0. */
static int __kprobes collect_one_slot(struct kprobe_insn_page *kip, int idx)
{
@@ -226,9 +236,13 @@ static int __kprobes collect_garbage_slots(void)
{
struct kprobe_insn_page *kip;
struct hlist_node *pos, *next;
+ int safety;
/* Ensure no-one is preepmted on the garbages */
- if (check_safety() != 0)
+ mutex_unlock(&kprobe_insn_mutex);
+ safety = check_safety();
+ mutex_lock(&kprobe_insn_mutex);
+ if (safety != 0)
return -EAGAIN;
hlist_for_each_entry_safe(kip, pos, next, &kprobe_insn_pages, hlist) {
@@ -251,6 +265,7 @@ void __kprobes free_insn_slot(kprobe_opcode_t * slot, int dirty)
struct kprobe_insn_page *kip;
struct hlist_node *pos;
+ mutex_lock(&kprobe_insn_mutex);
hlist_for_each_entry(kip, pos, &kprobe_insn_pages, hlist) {
if (kip->insns <= slot &&
slot < kip->insns + (INSNS_PER_PAGE * MAX_INSN_SIZE)) {
@@ -267,6 +282,8 @@ void __kprobes free_insn_slot(kprobe_opcode_t * slot, int dirty)
if (dirty && ++kprobe_garbage_slots > INSNS_PER_PAGE)
collect_garbage_slots();
+
+ mutex_unlock(&kprobe_insn_mutex);
}
#endif
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