Messages in this thread Patch in this message | | | Subject | [PATCH -tip v2 1/3] kprobes: Introduce nokprobe annotation for non-probe-able functions | From | Masami Hiramatsu <> | Date | Fri, 01 Nov 2013 11:25:32 +0000 |
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Instead of __kprobes annotation, introduce 'nokprobe' new annotation to annotate that the function is not probed by kprobes.
Previously the '__kprobes' is used just for avoiding probes on kprobes-related functions which will be used from kprobes. However nowadays we use it for prohibiting probing the functions implicitly invoked from kprobes int3 handler, since that causes infinit-loop lockup or sudden reboot. In this case, the annotated functions are not limited in the kprobes-related functions, and __kprobes looks very confusing. (Moreover, actually, most of control-side kprobes functions like as register_kprobes() are safely probed by kprobes)
Thus, we decide to introduce 'nokprobe' new annotation. We leave "__kprobes" just for compatibility but it should be replaced or removed eventually.
New commits must use 'nokprobe' for this purpose.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> --- include/linux/compiler.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 92669cd..173c64e 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -353,8 +353,10 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect); /* Ignore/forbid kprobes attach on very low level functions marked by this attribute: */ #ifdef CONFIG_KPROBES -# define __kprobes __attribute__((__section__(".kprobes.text"))) +# define nokprobe __attribute__((__section__(".kprobes.text"))) #else -# define __kprobes +# define nokprobe #endif +#define __kprobes nokprobe + #endif /* __LINUX_COMPILER_H */
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