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