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| author | Masami Hiramatsu <mhiramat@kernel.org> | 2019-02-12 17:12:15 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2019-02-13 08:16:39 +0100 |
| commit | c13324a505c7790fe91a9df35be2e0462abccdb0 (patch) | |
| tree | d99299fcdea3562a4629f5721388759c16cad7b4 /kernel/rcu | |
| parent | x86/kprobes: Move trampoline code into RODATA (diff) | |
| download | linux-c13324a505c7790fe91a9df35be2e0462abccdb0.tar.xz linux-c13324a505c7790fe91a9df35be2e0462abccdb0.zip | |
x86/kprobes: Prohibit probing on functions before kprobe_int3_handler()
Prohibit probing on the functions called before kprobe_int3_handler()
in do_int3(). More specifically, ftrace_int3_handler(),
poke_int3_handler(), and ist_enter(). And since rcu_nmi_enter() is
called by ist_enter(), it also should be marked as NOKPROBE_SYMBOL.
Since those are handled before kprobe_int3_handler(), probing those
functions can cause a breakpoint recursion and crash the kernel.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrea Righi <righi.andrea@gmail.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/154998793571.31052.11301258949601150994.stgit@devbox
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 9180158756d2..74db52a0a466 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -62,6 +62,7 @@ #include <linux/suspend.h> #include <linux/ftrace.h> #include <linux/tick.h> +#include <linux/kprobes.h> #include "tree.h" #include "rcu.h" @@ -872,6 +873,7 @@ void rcu_nmi_enter(void) { rcu_nmi_enter_common(false); } +NOKPROBE_SYMBOL(rcu_nmi_enter); /** * rcu_irq_enter - inform RCU that current CPU is entering irq away from idle |