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| author | Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> | 2014-06-14 10:47:12 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-06-14 11:07:44 +0400 |
| commit | 4cdf77a828b056258f48a9f6078bd2f77d9704bb (patch) | |
| tree | 2a7a904eddc42c595c6a82204a9032b97d0c071f /kernel/context_tracking.c | |
| parent | ed9ea4ed3a44e8f8e8c7e8a12a05fd73f9ae1fb4 (diff) | |
| download | linux-4cdf77a828b056258f48a9f6078bd2f77d9704bb.tar.xz | |
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>
Diffstat (limited to 'kernel/context_tracking.c')
| -rw-r--r-- | kernel/context_tracking.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c index 019d45008448..5664985c46a0 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 |