Masami Hiramatsu 9a556ab998 kprobes/x86: Check Interrupt Flag modifier when registering probe ... Currently kprobes check whether the copied instruction modifies IF (interrupt flag) on each probe hit. This results not only in introducing overhead but also involving inat_get_opcode_attribute into the kprobes hot path, and it can cause an infinite recursive call (and kernel panic in the end). Actually, since the copied instruction itself can never be modified on the buffer, it is needless to analyze the instruction on every probe hit. To fix this issue, we check it only once when registering probe and store the result on ainsn->if_modifier. Reported-by: Timo Juhani Lindfors <timo.lindfors@iki.fi> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: yrl.pp-manager.tt@hitachi.com Cc: Steven Rostedt <rostedt@goodmis.org> Cc: David S. Miller <davem@davemloft.net> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/20130314115242.19690.33573.stgit@mhiramat-M0-7522 Signed-off-by: Ingo Molnar <mingo@kernel.org>		2013-03-18 10:21:23 +01:00
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common.h	kprobes/x86: Move kprobes stuff under arch/x86/kernel/kprobes/	2013-01-21 13:22:37 -05:00
core.c	kprobes/x86: Check Interrupt Flag modifier when registering probe	2013-03-18 10:21:23 +01:00
ftrace.c	kprobes/x86: Move kprobes stuff under arch/x86/kernel/kprobes/	2013-01-21 13:22:37 -05:00
Makefile	kprobes/x86: Move kprobes stuff under arch/x86/kernel/kprobes/	2013-01-21 13:22:37 -05:00
opt.c	kprobes/x86: Move kprobes stuff under arch/x86/kernel/kprobes/	2013-01-21 13:22:37 -05:00