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Message-ID: <2643836.mvXUDI8C0e@kreacher>
Date: Thu, 04 Aug 2022 19:15:08 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Kees Cook <keescook@...omium.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH] PM: core: Do not randomize struct dev_pm_ops layout
From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Because __rpm_get_callback() uses offsetof() to compute the address of
the callback in question in struct dev_pm_ops, randomizing the layout
of the latter leads to interesting, but unfortunately also undesirable
results in some cases.
Prevent that from happening by using the __no_randomize_layout
annotation on struct dev_pm_ops.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
include/linux/pm.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: linux-pm/include/linux/pm.h
===================================================================
--- linux-pm.orig/include/linux/pm.h
+++ linux-pm/include/linux/pm.h
@@ -307,7 +307,7 @@ struct dev_pm_ops {
int (*runtime_suspend)(struct device *dev);
int (*runtime_resume)(struct device *dev);
int (*runtime_idle)(struct device *dev);
-};
+} __no_randomize_layout;
#define SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
.suspend = pm_sleep_ptr(suspend_fn), \
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