f438d914b2
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>
95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
#ifndef _ASM_KPROBES_H
|
|
#define _ASM_KPROBES_H
|
|
/*
|
|
* Kernel Probes (KProbes)
|
|
* include/asm-i386/kprobes.h
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
* Copyright (C) IBM Corporation, 2002, 2004
|
|
*
|
|
* 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
|
|
* Probes initial implementation ( includes suggestions from
|
|
* Rusty Russell).
|
|
*/
|
|
#include <linux/types.h>
|
|
#include <linux/ptrace.h>
|
|
|
|
#define __ARCH_WANT_KPROBES_INSN_SLOT
|
|
|
|
struct kprobe;
|
|
struct pt_regs;
|
|
|
|
typedef u8 kprobe_opcode_t;
|
|
#define BREAKPOINT_INSTRUCTION 0xcc
|
|
#define RELATIVEJUMP_INSTRUCTION 0xe9
|
|
#define MAX_INSN_SIZE 16
|
|
#define MAX_STACK_SIZE 64
|
|
#define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
|
|
(((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \
|
|
? (MAX_STACK_SIZE) \
|
|
: (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
|
|
|
|
#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);
|
|
|
|
/* Architecture specific copy of original instruction*/
|
|
struct arch_specific_insn {
|
|
/* copy of the original instruction */
|
|
kprobe_opcode_t *insn;
|
|
/*
|
|
* If this flag is not 0, this kprobe can be boost when its
|
|
* post_handler and break_handler is not set.
|
|
*/
|
|
int boostable;
|
|
};
|
|
|
|
struct prev_kprobe {
|
|
struct kprobe *kp;
|
|
unsigned long status;
|
|
unsigned long old_eflags;
|
|
unsigned long saved_eflags;
|
|
};
|
|
|
|
/* per-cpu kprobe control block */
|
|
struct kprobe_ctlblk {
|
|
unsigned long kprobe_status;
|
|
unsigned long kprobe_old_eflags;
|
|
unsigned long kprobe_saved_eflags;
|
|
long *jprobe_saved_esp;
|
|
struct pt_regs jprobe_saved_regs;
|
|
kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
|
|
struct prev_kprobe prev_kprobe;
|
|
};
|
|
|
|
/* trap3/1 are intr gates for kprobes. So, restore the status of IF,
|
|
* if necessary, before executing the original int3/1 (trap) handler.
|
|
*/
|
|
static inline void restore_interrupts(struct pt_regs *regs)
|
|
{
|
|
if (regs->eflags & IF_MASK)
|
|
local_irq_enable();
|
|
}
|
|
|
|
extern int kprobe_exceptions_notify(struct notifier_block *self,
|
|
unsigned long val, void *data);
|
|
extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
|
|
#endif /* _ASM_KPROBES_H */
|