Commit-ID: 4554dbcb85a4ed2abaa2b6fa15649b796699ec89 Gitweb: http://git.kernel.org/tip/4554dbcb85a4ed2abaa2b6fa15649b796699ec89 Author: Masami Hiramatsu <mhiramat@xxxxxxxxxx> AuthorDate: Tue, 2 Feb 2010 16:49:18 -0500 Committer: Ingo Molnar <mingo@xxxxxxx> CommitDate: Thu, 4 Feb 2010 09:36:19 +0100 kprobes: Check probe address is reserved Check whether the address of new probe is already reserved by ftrace or alternatives (on x86) when registering new probe. If reserved, it returns an error and not register the probe. Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx> Cc: systemtap <systemtap@xxxxxxxxxxxxxxxxxx> Cc: DLE <dle-develop@xxxxxxxxxxxxxxxxxxxxx> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> Cc: przemyslaw@xxxxxxxxxxxx Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx> Cc: Ananth N Mavinakayanahalli <ananth@xxxxxxxxxx> Cc: Jim Keniston <jkenisto@xxxxxxxxxx> Cc: Mathieu Desnoyers <compudj@xxxxxxxxxxxxxxxxxx> Cc: Jason Baron <jbaron@xxxxxxxxxx> LKML-Reference: <20100202214918.4694.94179.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx> Signed-off-by: Ingo Molnar <mingo@xxxxxxx> --- arch/x86/kernel/kprobes.c | 3 +++ kernel/kprobes.c | 4 +++- 2 files changed, 6 insertions(+), 1 deletions(-) diff --git a/arch/x86/kernel/kprobes.c b/arch/x86/kernel/kprobes.c index 9453815..5de9f4a 100644 --- a/arch/x86/kernel/kprobes.c +++ b/arch/x86/kernel/kprobes.c @@ -337,6 +337,9 @@ static void __kprobes arch_copy_kprobe(struct kprobe *p) int __kprobes arch_prepare_kprobe(struct kprobe *p) { + if (alternatives_text_reserved(p->addr, p->addr)) + return -EINVAL; + if (!can_probe((unsigned long)p->addr)) return -EILSEQ; /* insn: must be on special executable page on x86. */ diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 9907a03..c3340e8 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -44,6 +44,7 @@ #include <linux/debugfs.h> #include <linux/kdebug.h> #include <linux/memory.h> +#include <linux/ftrace.h> #include <asm-generic/sections.h> #include <asm/cacheflush.h> @@ -703,7 +704,8 @@ int __kprobes register_kprobe(struct kprobe *p) preempt_disable(); if (!kernel_text_address((unsigned long) p->addr) || - in_kprobes_functions((unsigned long) p->addr)) { + in_kprobes_functions((unsigned long) p->addr) || + ftrace_text_reserved(p->addr, p->addr)) { preempt_enable(); return -EINVAL; } -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html