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kprobes: Prohibit probing on preemption checking debug functions

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Since kprobes depends on preempt disable/enable, probing
on the preempt debug routines can cause recursive breakpoint
bugs.

Signed-off-by: Masami Hiramatsu <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andrea Righi <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/154998804911.31052.3541963527929117920.stgit@devbox
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Masami Hiramatsu authored and Ingo Molnar committed 2019-02-13 08:16:40 +01:00
1 parent eeeb080bae
commit 984640ce42
1 file changed
+5 -2
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lib/smp_processor_id.c
+5 -2
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@@ -5,10 +5,11 @@
* DEBUG_PREEMPT variant of smp_processor_id().
*/
#include <linux/export.h>
#include <linux/kprobes.h>
#include <linux/sched.h>
notrace static unsigned int check_preemption_disabled(const char *what1,
const char *what2)
notrace static nokprobe_inline
unsigned int check_preemption_disabled(const char *what1, const char *what2)
{
int this_cpu = raw_smp_processor_id();
@@ -56,9 +57,11 @@ notrace unsigned int debug_smp_processor_id(void)
return check_preemption_disabled("smp_processor_id", "");
}
EXPORT_SYMBOL(debug_smp_processor_id);
NOKPROBE_SYMBOL(debug_smp_processor_id);
notrace void __this_cpu_preempt_check(const char *op)
{
check_preemption_disabled("__this_cpu_", op);
}
EXPORT_SYMBOL(__this_cpu_preempt_check);
NOKPROBE_SYMBOL(__this_cpu_preempt_check);