From: Thomas Gleixner <tglx@linutronix.de> To: LKML <linux-kernel@vger.kernel.org> Cc: x86@kernel.org, Paul McKenney <paulmck@kernel.org>, Josh Poimboeuf <jpoimboe@redhat.com>, "Joel Fernandes (Google)" <joel@joelfernandes.org>, "Steven Rostedt (VMware)" <rostedt@goodmis.org>, Masami Hiramatsu <mhiramat@kernel.org>, Alexei Starovoitov <ast@kernel.org>, Frederic Weisbecker <frederic@kernel.org>, Mathieu Desnoyers <mathieu.desnoyers@efficios.com>, Brian Gerst <brgerst@gmail.com>, Juergen Gross <jgross@suse.com>, Alexandre Chartre <alexandre.chartre@oracle.com>, Peter Zijlstra <peterz@infradead.org>, Tom Lendacky <thomas.lendacky@amd.com>, Paolo Bonzini <pbonzini@redhat.com>, kvm@vger.kernel.org Subject: [RESEND][patch V3 04/23] kprobes: Prevent probes in .noinstr.text section Date: Fri, 20 Mar 2020 19:00:00 +0100 [thread overview] Message-ID: <20200320180032.799569116@linutronix.de> (raw) In-Reply-To: 20200320175956.033706968@linutronix.de Instrumentation is forbidden in the .noinstr.text section. Make kprobes respect this. This lacks support for .noinstr.text sections in modules, which is required to handle VMX and SVM. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- kernel/kprobes.c | 11 +++++++++++ 1 file changed, 11 insertions(+) --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -1443,10 +1443,21 @@ static bool __within_kprobe_blacklist(un return false; } +/* Functions in .noinstr.text must not be probed */ +static bool within_noinstr_text(unsigned long addr) +{ + /* FIXME: Handle module .noinstr.text */ + return addr >= (unsigned long)__noinstr_text_start && + addr < (unsigned long)__noinstr_text_end; +} + bool within_kprobe_blacklist(unsigned long addr) { char symname[KSYM_NAME_LEN], *p; + if (within_noinstr_text(addr)) + return true; + if (__within_kprobe_blacklist(addr)) return true;
WARNING: multiple messages have this Message-ID (diff)
From: Thomas Gleixner <tglx@linutronix.de> To: LKML <linux-kernel@vger.kernel.org> Cc: x86@kernel.org, Paul McKenney <paulmck@kernel.org>, Josh Poimboeuf <jpoimboe@redhat.com>, "Joel Fernandes (Google)" <joel@joelfernandes.org>, "Steven Rostedt (VMware)" <rostedt@goodmis.org>, Masami Hiramatsu <mhiramat@kernel.org>, Alexei Starovoitov <ast@kernel.org>, Frederic Weisbecker <frederic@kernel.org>, Mathieu Desnoyers <mathieu.desnoyers@efficios.com>, Brian Gerst <brgerst@gmail.com>, Juergen Gross <jgross@suse.com>, Alexandre Chartre <alexandre.chartre@oracle.com>, Peter Zijlstra <peterz@infradead.org>, Tom Lendacky <thomas.lendacky@amd.com>, Paolo Bonzini <pbonzini@redhat.com>, kvm@vger.kernel.org Subject: [patch V3 04/23] kprobes: Prevent probes in .noinstr.text section Date: Fri, 20 Mar 2020 19:00:00 +0100 [thread overview] Message-ID: <20200320180032.799569116@linutronix.de> (raw) In-Reply-To: 20200320175956.033706968@linutronix.de Instrumentation is forbidden in the .noinstr.text section. Make kprobes respect this. This lacks support for .noinstr.text sections in modules, which is required to handle VMX and SVM. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- kernel/kprobes.c | 11 +++++++++++ 1 file changed, 11 insertions(+) --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -1443,10 +1443,21 @@ static bool __within_kprobe_blacklist(un return false; } +/* Functions in .noinstr.text must not be probed */ +static bool within_noinstr_text(unsigned long addr) +{ + /* FIXME: Handle module .noinstr.text */ + return addr >= (unsigned long)__noinstr_text_start && + addr < (unsigned long)__noinstr_text_end; +} + bool within_kprobe_blacklist(unsigned long addr) { char symname[KSYM_NAME_LEN], *p; + if (within_noinstr_text(addr)) + return true; + if (__within_kprobe_blacklist(addr)) return true;
next prev parent reply other threads:[~2020-03-20 22:06 UTC|newest] Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-03-20 17:59 [RESEND][patch V3 00/23] x86/entry: Consolidation part II (syscalls) Thomas Gleixner 2020-03-20 17:59 ` [patch " Thomas Gleixner 2020-03-20 17:59 ` [RESEND][patch V3 01/23] rcu: Dont acquire lock in NMI handler in rcu_nmi_enter_common() Thomas Gleixner 2020-03-20 17:59 ` [patch " Thomas Gleixner 2020-03-24 15:37 ` Frederic Weisbecker 2020-03-20 17:59 ` [RESEND][patch V3 02/23] rcu: Add comments marking transitions between RCU watching and not Thomas Gleixner 2020-03-20 17:59 ` [patch " Thomas Gleixner 2020-03-24 15:38 ` Frederic Weisbecker 2020-03-20 17:59 ` [RESEND][patch V3 03/23] vmlinux.lds.h: Create section for protection against instrumentation Thomas Gleixner 2020-03-20 17:59 ` [patch " Thomas Gleixner 2020-03-24 12:26 ` [RESEND][patch " Borislav Petkov 2020-04-03 8:08 ` Alexandre Chartre 2020-03-20 18:00 ` Thomas Gleixner [this message] 2020-03-20 18:00 ` [patch V3 04/23] kprobes: Prevent probes in .noinstr.text section Thomas Gleixner 2020-03-23 14:00 ` Masami Hiramatsu 2020-03-23 16:03 ` Thomas Gleixner 2020-03-24 5:49 ` Masami Hiramatsu 2020-03-24 9:47 ` Thomas Gleixner 2020-03-25 13:39 ` Masami Hiramatsu 2020-03-20 18:00 ` [RESEND][patch V3 05/23] tracing: Provide lockdep less trace_hardirqs_on/off() variants Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner 2020-04-03 8:34 ` [RESEND][patch " Alexandre Chartre 2020-03-20 18:00 ` [RESEND][patch V3 06/23] bug: Annotate WARN/BUG/stackfail as noinstr safe Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner 2020-04-02 21:01 ` [RESEND][patch " Josh Poimboeuf 2020-04-02 21:34 ` Peter Zijlstra 2020-04-02 21:43 ` Josh Poimboeuf 2020-04-02 21:49 ` Thomas Gleixner 2020-03-20 18:00 ` [RESEND][patch V3 07/23] lockdep: Prepare for noinstr sections Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner 2020-03-20 18:00 ` [RESEND][patch V3 08/23] x86/entry: Mark enter_from_user_mode() noinstr Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner 2020-03-20 18:00 ` [RESEND][patch V3 09/23] x86/entry/common: Protect against instrumentation Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner 2020-03-20 18:00 ` [RESEND][patch V3 10/23] x86/entry: Move irq tracing on syscall entry to C-code Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner 2020-03-20 18:00 ` [RESEND][patch V3 11/23] x86/entry: Move irq flags tracing to prepare_exit_to_usermode() Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner 2020-03-20 18:00 ` [RESEND][patch V3 12/23] context_tracking: Ensure that the critical path cannot be instrumented Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner 2020-03-20 18:00 ` [RESEND][patch V3 13/23] lib/smp_processor_id: Move it into noinstr section Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner 2020-03-20 18:00 ` [RESEND][patch V3 14/23] x86/speculation/mds: Mark mds_user_clear_cpu_buffers() __always_inline Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner 2020-03-20 18:00 ` [RESEND][patch V3 15/23] x86/entry/64: Check IF in __preempt_enable_notrace() thunk Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner 2020-03-20 18:00 ` [RESEND][patch V3 16/23] x86/entry/64: Mark ___preempt_schedule_notrace() thunk noinstr Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner 2020-03-20 18:00 ` [RESEND][patch V3 17/23] rcu/tree: Mark the idle relevant functions noinstr Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner 2020-03-24 16:09 ` [RESEND][patch " Paul E. McKenney 2020-03-24 19:28 ` Thomas Gleixner 2020-03-24 19:58 ` Paul E. McKenney 2020-03-20 18:00 ` [RESEND][patch V3 18/23] x86/kvm: Move context tracking where it belongs Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner 2020-03-20 18:00 ` [RESEND][patch V3 19/23] x86/kvm/vmx: Add hardirq tracing to guest enter/exit Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner 2020-03-24 23:03 ` [RESEND][patch " Peter Zijlstra 2020-03-24 23:21 ` Thomas Gleixner 2020-03-20 18:00 ` [RESEND][patch V3 20/23] x86/kvm/svm: Handle hardirqs proper on " Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner 2020-03-20 18:00 ` [RESEND][patch V3 21/23] context_tracking: Make guest_enter/exit_irqoff() .noinstr ready Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner 2020-03-20 18:00 ` [RESEND][patch V3 22/23] x86/kvm/vmx: Move guest enter/exit into .noinstr.text Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner 2020-03-20 18:00 ` [RESEND][patch V3 23/23] x86/kvm/svm: " Thomas Gleixner 2020-03-20 18:00 ` [patch " Thomas Gleixner
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