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authorKeshavamurthy Anil S <anil.s.keshavamurthy@intel.com>2005-09-06 15:19:35 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-07 16:58:01 -0700
commitdeac66ae454cacf942c051b86d9232af546fb187 (patch)
tree17a72e7a2dcf2d1a93a6afdef661f290b1888f1c /arch/ppc64/kernel
parentbce0649417d6e71f6df8ab7b11103d247913b142 (diff)
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[PATCH] kprobes: fix bug when probed on task and isr functions
This patch fixes a race condition where in system used to hang or sometime crash within minutes when kprobes are inserted on ISR routine and a task routine. The fix has been stress tested on i386, ia64, pp64 and on x86_64. To reproduce the problem insert kprobes on schedule() and do_IRQ() functions and you should see hang or system crash. Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Acked-by: Prasanna S Panchamukhi <prasanna@in.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/ppc64/kernel')
-rw-r--r--arch/ppc64/kernel/kprobes.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/arch/ppc64/kernel/kprobes.c b/arch/ppc64/kernel/kprobes.c
index 591e4b6..7e80d49 100644
--- a/arch/ppc64/kernel/kprobes.c
+++ b/arch/ppc64/kernel/kprobes.c
@@ -102,7 +102,7 @@ static inline void prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
regs->msr |= MSR_SE;
/* single step inline if it is a trap variant */
- if (IS_TW(insn) || IS_TD(insn) || IS_TWI(insn) || IS_TDI(insn))
+ if (is_trap(insn))
regs->nip = (unsigned long)p->addr;
else
regs->nip = (unsigned long)p->ainsn.insn;
@@ -152,7 +152,9 @@ static inline int kprobe_handler(struct pt_regs *regs)
Disarm the probe we just hit, and ignore it. */
p = get_kprobe(addr);
if (p) {
- if (kprobe_status == KPROBE_HIT_SS) {
+ kprobe_opcode_t insn = *p->ainsn.insn;
+ if (kprobe_status == KPROBE_HIT_SS &&
+ is_trap(insn)) {
regs->msr &= ~MSR_SE;
regs->msr |= kprobe_saved_msr;
unlock_kprobes();
@@ -192,8 +194,7 @@ static inline int kprobe_handler(struct pt_regs *regs)
* trap variant, it could belong to someone else
*/
kprobe_opcode_t cur_insn = *addr;
- if (IS_TW(cur_insn) || IS_TD(cur_insn) ||
- IS_TWI(cur_insn) || IS_TDI(cur_insn))
+ if (is_trap(cur_insn))
goto no_kprobe;
/*
* The breakpoint instruction was removed right
@@ -403,7 +404,7 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
default:
break;
}
- preempt_enable();
+ preempt_enable_no_resched();
return ret;
}