kprobes: support kretprobe blacklist
Introduce architecture dependent kretprobe blacklists to prohibit users
from inserting return probes on the function in which kprobes can be
inserted but kretprobes can not.
This patch also removes "__kprobes" mark from "__switch_to" on x86_64 and
registers "__switch_to" to the blacklist on x86-64, because that mark is to
prohibit user from inserting only kretprobe.
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/asm-avr32/kprobes.h b/include/asm-avr32/kprobes.h
index 0f3e636..996cb65 100644
--- a/include/asm-avr32/kprobes.h
+++ b/include/asm-avr32/kprobes.h
@@ -17,6 +17,8 @@
#define BREAKPOINT_INSTRUCTION 0xd673 /* breakpoint */
#define MAX_INSN_SIZE 2
+#define kretprobe_blacklist_size 0
+
#define arch_remove_kprobe(p) do { } while (0)
/* Architecture specific copy of original instruction */
diff --git a/include/asm-ia64/kprobes.h b/include/asm-ia64/kprobes.h
index 6c79edf..a93ce9e 100644
--- a/include/asm-ia64/kprobes.h
+++ b/include/asm-ia64/kprobes.h
@@ -83,6 +83,7 @@
};
#define ARCH_SUPPORTS_KRETPROBES
+#define kretprobe_blacklist_size 0
#define SLOT0_OPCODE_SHIFT (37)
#define SLOT1_p1_OPCODE_SHIFT (37 - (64-46))
diff --git a/include/asm-powerpc/kprobes.h b/include/asm-powerpc/kprobes.h
index c16973d..afabad2 100644
--- a/include/asm-powerpc/kprobes.h
+++ b/include/asm-powerpc/kprobes.h
@@ -82,6 +82,7 @@
#define ARCH_SUPPORTS_KRETPROBES
#define flush_insn_slot(p) do { } while (0)
+#define kretprobe_blacklist_size 0
void kretprobe_trampoline(void);
extern void arch_remove_kprobe(struct kprobe *p);
diff --git a/include/asm-s390/kprobes.h b/include/asm-s390/kprobes.h
index 8bc67cc..948db3d 100644
--- a/include/asm-s390/kprobes.h
+++ b/include/asm-s390/kprobes.h
@@ -47,6 +47,7 @@
: (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
#define ARCH_SUPPORTS_KRETPROBES
+#define kretprobe_blacklist_size 0
#define KPROBE_SWAP_INST 0x10
diff --git a/include/asm-sparc64/kprobes.h b/include/asm-sparc64/kprobes.h
index a04145b..5020eaf 100644
--- a/include/asm-sparc64/kprobes.h
+++ b/include/asm-sparc64/kprobes.h
@@ -10,6 +10,8 @@
#define BREAKPOINT_INSTRUCTION_2 0x91d02071 /* ta 0x71 */
#define MAX_INSN_SIZE 2
+#define kretprobe_blacklist_size 0
+
#define arch_remove_kprobe(p) do {} while (0)
#define flush_insn_slot(p) \
diff --git a/include/asm-x86/kprobes_32.h b/include/asm-x86/kprobes_32.h
index f2489d0..b772d5b 100644
--- a/include/asm-x86/kprobes_32.h
+++ b/include/asm-x86/kprobes_32.h
@@ -45,6 +45,8 @@
#define ARCH_SUPPORTS_KRETPROBES
#define flush_insn_slot(p) do { } while (0)
+extern const int kretprobe_blacklist_size;
+
void arch_remove_kprobe(struct kprobe *p);
void kretprobe_trampoline(void);
diff --git a/include/asm-x86/kprobes_64.h b/include/asm-x86/kprobes_64.h
index 3f495e5..53f4d85 100644
--- a/include/asm-x86/kprobes_64.h
+++ b/include/asm-x86/kprobes_64.h
@@ -42,6 +42,7 @@
: (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
#define ARCH_SUPPORTS_KRETPROBES
+extern const int kretprobe_blacklist_size;
void kretprobe_trampoline(void);
extern void arch_remove_kprobe(struct kprobe *p);
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 51464d1..8189158 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -166,6 +166,12 @@
struct task_struct *task;
};
+struct kretprobe_blackpoint {
+ const char *name;
+ void *addr;
+};
+extern struct kretprobe_blackpoint kretprobe_blacklist[];
+
static inline void kretprobe_assert(struct kretprobe_instance *ri,
unsigned long orig_ret_address, unsigned long trampoline_address)
{