[tip:perf/urgent] x86/kprobes: Fix build errors and blacklist context_track_user

tip-bot for Masami Hiramatsu
2014-06-14T08:59:04Z

Commit-ID: 4cdf77a828b056258f48a9f6078bd2f77d9704bb
Gitweb: http://git.kernel.org/tip/4cdf77a828b056258f48a9f6078bd2f77d9704bb
Author: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
AuthorDate: Sat, 14 Jun 2014 06:47:12 +0000
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Sat, 14 Jun 2014 09:07:44 +0200

x86/kprobes: Fix build errors and blacklist context_track_user

This essentially reverts commit:

ecd50f714c42 ("kprobes, x86: Call exception_enter after kprobes handled")

since it causes build errors with CONFIG_CONTEXT_TRACKING and
that has been made from misunderstandings;
context_track_user_*() don't involve much in interrupt context,
it just returns if in_interrupt() is true.

Instead of changing the do_debug/int3(), this just adds
context_track_user_*() to kprobes blacklist, since those are
still can be called right before kprobes handles int3 and debug
exceptions, and probing those will cause an infinite loop.

Reported-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Seiji Aguchi <seiji.aguchi@hds.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Kees Cook <keescook@chromium.org>
Link: http://lkml.kernel.org/r/20140614064711.7865.45957.stgit@kbuild-fedora.novalocal
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/traps.c | 7 ++++---
kernel/context_tracking.c | 3 +++
2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index c6eb418..0d0e922 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -343,6 +343,7 @@ dotraplinkage void notrace do_int3(struct pt_regs *regs, long error_code)
if (poke_int3_handler(regs))
return;

+ prev_state = exception_enter();
#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
if (kgdb_ll_trap(DIE_INT3, "int3", regs, error_code, X86_TRAP_BP,
SIGTRAP) == NOTIFY_STOP)
@@ -351,9 +352,8 @@ dotraplinkage void notrace do_int3(struct pt_regs *regs, long error_code)

#ifdef CONFIG_KPROBES
if (kprobe_int3_handler(regs))
- return;
+ goto exit;
#endif
- prev_state = exception_enter();

if (notify_die(DIE_INT3, "int3", regs, error_code, X86_TRAP_BP,
SIGTRAP) == NOTIFY_STOP)
@@ -433,6 +433,8 @@ dotraplinkage void do_debug(struct pt_regs *regs, long error_code)
unsigned long dr6;
int si_code;

+ prev_state = exception_enter();
+
get_debugreg(dr6, 6);

/* Filter out all the reserved bits which are preset to 1 */
@@ -465,7 +467,6 @@ dotraplinkage void do_debug(struct pt_regs *regs, long error_code)
if (kprobe_debug_handler(regs))
goto exit;
#endif
- prev_state = exception_enter();

if (notify_die(DIE_DEBUG, "debug", regs, (long)&dr6, error_code,
SIGTRAP) == NOTIFY_STOP)
diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index 019d450..5664985 100644
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -19,6 +19,7 @@
#include <linux/sched.h>
#include <linux/hardirq.h>
#include <linux/export.h>
+#include <linux/kprobes.h>

#define CREATE_TRACE_POINTS
#include <trace/events/context_tracking.h>
@@ -104,6 +105,7 @@ void context_tracking_user_enter(void)
}
local_irq_restore(flags);
}
+NOKPROBE_SYMBOL(context_tracking_user_enter);

#ifdef CONFIG_PREEMPT
/**
@@ -181,6 +183,7 @@ void context_tracking_user_exit(void)
}
local_irq_restore(flags);
}
+NOKPROBE_SYMBOL(context_tracking_user_exit);

/**
* __context_tracking_task_switch - context switch the syscall callbacks