On Mon, Mar 11, 2013 at 11:22:33PM +0900, Masami Hiramatsu wrote: > Beacuse hash_64() is called from the get_kprobe() inside > int3 handler, kernel causes int3 recursion and crashes if > kprobes user puts a probe on it. > > Usually hash_64() is inlined into caller function, but in > some cases, it has instances by gcc's interprocedural > constant propagation. > > This patch adds __kprobes tag on the hash_64() and moves > all those instances into .text.kprobe section so that > kprobes can refuse probing on the instances. > > I've ensured that all hash_64 instances moves to the > address between __kprobes_text_start and __kprobes_text_end > with this patch as below. > > ffffffff8138bea0 T __kprobes_text_start > ffffffff8138bec0 t hash_64.constprop.8 > ffffffff8138ef98 t hash_64.constprop.26 > ffffffff8138efae t hash_64 > ffffffff8138f066 t hash_64.constprop.43 > ffffffff8138f649 t hash_64.constprop.25 > ffffffff8139103a t hash_64.constprop.77 > ffffffff81391050 t hash_64.constprop.24 > ffffffff81391066 t hash_64.constprop.40 > ffffffff8139107c t hash_64.constprop.15 > ffffffff81391092 T __kprobes_text_end > > Signed-off-by: Masami Hiramatsu <masami.hiramatsu...@hitachi.com> > Reported-by: Timo Juhani Lindfors <timo.lindf...@iki.fi> > Cc: "David S. Miller" <da...@davemloft.net> > Cc: Nadia Yvette Chambers <n...@holomorphy.com> > Cc: Pavel Emelyanov <xe...@parallels.com> > Cc: Jiri Kosina <jkos...@suse.cz> > Cc: Ananth N Mavinakayanahalli <ana...@in.ibm.com>
Acked-by: Ananth N Mavinakayanahalli <ana...@in.ibm.com> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
