| From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.19 104/192] kprobes: Prohibit probing on bsearch() | Date | Wed, 27 Mar 2019 14:08:56 -0400 |
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From: Andrea Righi <righi.andrea@gmail.com>
[ Upstream commit 02106f883cd745523f7766d90a739f983f19e650 ]
Since kprobe breakpoing handler is using bsearch(), probing on this routine can cause recursive breakpoint problem.
int3 ->do_int3() ->ftrace_int3_handler() ->ftrace_location() ->ftrace_location_range() ->bsearch() -> int3
Prohibit probing on bsearch().
Signed-off-by: Andrea Righi <righi.andrea@gmail.com> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/154998813406.31052.8791425358974650922.stgit@devbox Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- lib/bsearch.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/lib/bsearch.c b/lib/bsearch.c index 18b445b010c3..82512fe7b33c 100644 --- a/lib/bsearch.c +++ b/lib/bsearch.c @@ -11,6 +11,7 @@ #include <linux/export.h> #include <linux/bsearch.h> +#include <linux/kprobes.h> /* * bsearch - binary search an array of elements @@ -53,3 +54,4 @@ void *bsearch(const void *key, const void *base, size_t num, size_t size, return NULL; } EXPORT_SYMBOL(bsearch); +NOKPROBE_SYMBOL(bsearch); -- 2.19.1
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