[PATCH] kprobes: prevent possible race conditions x86_64 changes
This patch contains the x86_64 architecture specific changes to prevent the possible race conditions. Signed-off-by: Prasanna S Panchamukhi <prasanna@in.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Prasanna S Panchamukhi
Linus Torvalds
parent
3d97ae5b95
commit
0f2fbdcbb0
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@ -784,8 +784,9 @@ ENTRY(execve)
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ret
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CFI_ENDPROC
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ENTRY(page_fault)
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KPROBE_ENTRY(page_fault)
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errorentry do_page_fault
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.previous .text
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ENTRY(coprocessor_error)
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zeroentry do_coprocessor_error
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@ -797,13 +798,14 @@ ENTRY(device_not_available)
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zeroentry math_state_restore
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/* runs on exception stack */
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ENTRY(debug)
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KPROBE_ENTRY(debug)
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CFI_STARTPROC
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pushq $0
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CFI_ADJUST_CFA_OFFSET 8
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paranoidentry do_debug
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jmp paranoid_exit
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CFI_ENDPROC
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.previous .text
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/* runs on exception stack */
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ENTRY(nmi)
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@ -854,8 +856,9 @@ paranoid_schedule:
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jmp paranoid_userspace
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CFI_ENDPROC
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ENTRY(int3)
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KPROBE_ENTRY(int3)
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zeroentry do_int3
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.previous .text
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ENTRY(overflow)
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zeroentry do_overflow
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@ -892,8 +895,9 @@ ENTRY(stack_segment)
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jmp paranoid_exit
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CFI_ENDPROC
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ENTRY(general_protection)
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KPROBE_ENTRY(general_protection)
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errorentry do_general_protection
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.previous .text
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ENTRY(alignment_check)
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errorentry do_alignment_check
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@ -74,7 +74,7 @@ static inline int is_IF_modifier(kprobe_opcode_t *insn)
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return 0;
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}
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int arch_prepare_kprobe(struct kprobe *p)
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int __kprobes arch_prepare_kprobe(struct kprobe *p)
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{
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/* insn: must be on special executable page on x86_64. */
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up(&kprobe_mutex);
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@ -189,7 +189,7 @@ static inline s32 *is_riprel(u8 *insn)
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return NULL;
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}
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void arch_copy_kprobe(struct kprobe *p)
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void __kprobes arch_copy_kprobe(struct kprobe *p)
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{
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s32 *ripdisp;
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memcpy(p->ainsn.insn, p->addr, MAX_INSN_SIZE);
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@ -215,21 +215,21 @@ void arch_copy_kprobe(struct kprobe *p)
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p->opcode = *p->addr;
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}
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void arch_arm_kprobe(struct kprobe *p)
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void __kprobes arch_arm_kprobe(struct kprobe *p)
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{
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*p->addr = BREAKPOINT_INSTRUCTION;
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flush_icache_range((unsigned long) p->addr,
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(unsigned long) p->addr + sizeof(kprobe_opcode_t));
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}
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void arch_disarm_kprobe(struct kprobe *p)
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void __kprobes arch_disarm_kprobe(struct kprobe *p)
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{
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*p->addr = p->opcode;
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flush_icache_range((unsigned long) p->addr,
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(unsigned long) p->addr + sizeof(kprobe_opcode_t));
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}
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void arch_remove_kprobe(struct kprobe *p)
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void __kprobes arch_remove_kprobe(struct kprobe *p)
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{
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up(&kprobe_mutex);
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free_insn_slot(p->ainsn.insn);
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@ -261,7 +261,7 @@ static inline void set_current_kprobe(struct kprobe *p, struct pt_regs *regs)
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kprobe_saved_rflags &= ~IF_MASK;
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}
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static void prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
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static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
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{
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regs->eflags |= TF_MASK;
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regs->eflags &= ~IF_MASK;
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@ -272,7 +272,8 @@ static void prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
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regs->rip = (unsigned long)p->ainsn.insn;
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}
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void arch_prepare_kretprobe(struct kretprobe *rp, struct pt_regs *regs)
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void __kprobes arch_prepare_kretprobe(struct kretprobe *rp,
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struct pt_regs *regs)
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{
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unsigned long *sara = (unsigned long *)regs->rsp;
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struct kretprobe_instance *ri;
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@ -295,7 +296,7 @@ void arch_prepare_kretprobe(struct kretprobe *rp, struct pt_regs *regs)
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* Interrupts are disabled on entry as trap3 is an interrupt gate and they
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* remain disabled thorough out this function.
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*/
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int kprobe_handler(struct pt_regs *regs)
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int __kprobes kprobe_handler(struct pt_regs *regs)
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{
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struct kprobe *p;
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int ret = 0;
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@ -399,7 +400,7 @@ no_kprobe:
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/*
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* Called when we hit the probe point at kretprobe_trampoline
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*/
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int trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
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int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
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{
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struct kretprobe_instance *ri = NULL;
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struct hlist_head *head;
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@ -478,7 +479,7 @@ int trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
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* that is atop the stack is the address following the copied instruction.
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* We need to make it the address following the original instruction.
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*/
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static void resume_execution(struct kprobe *p, struct pt_regs *regs)
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static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs)
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{
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unsigned long *tos = (unsigned long *)regs->rsp;
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unsigned long next_rip = 0;
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@ -536,7 +537,7 @@ static void resume_execution(struct kprobe *p, struct pt_regs *regs)
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* Interrupts are disabled on entry as trap1 is an interrupt gate and they
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* remain disabled thoroughout this function. And we hold kprobe lock.
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*/
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int post_kprobe_handler(struct pt_regs *regs)
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int __kprobes post_kprobe_handler(struct pt_regs *regs)
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{
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if (!kprobe_running())
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return 0;
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@ -571,7 +572,7 @@ out:
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}
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/* Interrupts disabled, kprobe_lock held. */
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int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
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int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
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{
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if (current_kprobe->fault_handler
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&& current_kprobe->fault_handler(current_kprobe, regs, trapnr))
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@ -590,8 +591,8 @@ int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
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/*
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* Wrapper routine for handling exceptions.
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*/
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int kprobe_exceptions_notify(struct notifier_block *self, unsigned long val,
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void *data)
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int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
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unsigned long val, void *data)
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{
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struct die_args *args = (struct die_args *)data;
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switch (val) {
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@ -619,7 +620,7 @@ int kprobe_exceptions_notify(struct notifier_block *self, unsigned long val,
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return NOTIFY_DONE;
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}
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int setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
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int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
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{
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struct jprobe *jp = container_of(p, struct jprobe, kp);
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unsigned long addr;
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@ -640,7 +641,7 @@ int setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
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return 1;
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}
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void jprobe_return(void)
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void __kprobes jprobe_return(void)
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{
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preempt_enable_no_resched();
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asm volatile (" xchg %%rbx,%%rsp \n"
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@ -651,7 +652,7 @@ void jprobe_return(void)
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(jprobe_saved_rsp):"memory");
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}
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int longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
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int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
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{
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u8 *addr = (u8 *) (regs->rip - 1);
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unsigned long stack_addr = (unsigned long)jprobe_saved_rsp;
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@ -29,6 +29,7 @@
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/nmi.h>
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#include <linux/kprobes.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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@ -419,8 +420,9 @@ void die_nmi(char *str, struct pt_regs *regs)
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do_exit(SIGSEGV);
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}
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static void do_trap(int trapnr, int signr, char *str,
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struct pt_regs * regs, long error_code, siginfo_t *info)
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static void __kprobes do_trap(int trapnr, int signr, char *str,
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struct pt_regs * regs, long error_code,
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siginfo_t *info)
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{
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conditional_sti(regs);
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@ -504,7 +506,8 @@ DO_ERROR(18, SIGSEGV, "reserved", reserved)
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DO_ERROR(12, SIGBUS, "stack segment", stack_segment)
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DO_ERROR( 8, SIGSEGV, "double fault", double_fault)
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asmlinkage void do_general_protection(struct pt_regs * regs, long error_code)
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asmlinkage void __kprobes do_general_protection(struct pt_regs * regs,
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long error_code)
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{
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conditional_sti(regs);
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@ -622,7 +625,7 @@ asmlinkage void default_do_nmi(struct pt_regs *regs)
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io_check_error(reason, regs);
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}
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asmlinkage void do_int3(struct pt_regs * regs, long error_code)
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asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code)
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{
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if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) {
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return;
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@ -653,7 +656,8 @@ asmlinkage struct pt_regs *sync_regs(struct pt_regs *eregs)
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}
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/* runs on IST stack. */
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asmlinkage void do_debug(struct pt_regs * regs, unsigned long error_code)
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asmlinkage void __kprobes do_debug(struct pt_regs * regs,
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unsigned long error_code)
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{
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unsigned long condition;
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struct task_struct *tsk = current;
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@ -21,6 +21,7 @@ SECTIONS
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*(.text)
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SCHED_TEXT
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LOCK_TEXT
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KPROBES_TEXT
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*(.fixup)
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*(.gnu.warning)
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} = 0x9090
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@ -23,6 +23,7 @@
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#include <linux/vt_kern.h> /* For unblank_screen() */
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#include <linux/compiler.h>
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#include <linux/module.h>
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#include <linux/kprobes.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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@ -294,7 +295,8 @@ int exception_trace = 1;
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* bit 2 == 0 means kernel, 1 means user-mode
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* bit 3 == 1 means fault was an instruction fetch
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*/
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asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code)
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asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
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unsigned long error_code)
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{
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struct task_struct *tsk;
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struct mm_struct *mm;
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