kprobes: Ensure that jprobe probepoints are at function entry
Similar to commit 90ec5e89e3
("kretprobes: Ensure probe location is
at function entry"), ensure that the jprobe probepoint is at function
entry.
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/a4525af6c5a42df385efa31251246cf7cca73598.1499443367.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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parent
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@ -1795,10 +1795,14 @@ int register_jprobe(struct jprobe *jp)
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unsigned long addr, offset;
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unsigned long addr, offset;
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struct kprobe *kp = &jp->kp;
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struct kprobe *kp = &jp->kp;
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/* Verify probepoint is a function entry point */
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/*
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* Verify probepoint as well as the jprobe handler are
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* valid function entry points.
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*/
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addr = arch_deref_entry_point(jp->entry);
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addr = arch_deref_entry_point(jp->entry);
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if (kallsyms_lookup_size_offset(addr, NULL, &offset) && offset == 0) {
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if (kallsyms_lookup_size_offset(addr, NULL, &offset) && offset == 0 &&
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kprobe_on_func_entry(kp->addr, kp->symbol_name, kp->offset)) {
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kp->pre_handler = setjmp_pre_handler;
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kp->pre_handler = setjmp_pre_handler;
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kp->break_handler = longjmp_break_handler;
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kp->break_handler = longjmp_break_handler;
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return register_kprobe(kp);
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return register_kprobe(kp);
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