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11df5340c9
Add a RHEL reproducer that causes a kpatch-build to fail when the final module references a symbol with a different CRC than the original kernel. Signed-off-by: Julien Thierry <jthierry@redhat.com>
52 lines
1.4 KiB
Diff
52 lines
1.4 KiB
Diff
From bcb86fa4e9c31379a9e2716eae29cd53ccca064f Mon Sep 17 00:00:00 2001
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From: Julien Thierry <jthierry@redhat.com>
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Date: Wed, 6 May 2020 14:30:57 +0100
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Subject: [PATCH] Symbol version change
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This change causes:
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1) Some exported symbols in drivers/base/core.c to see their CRCs
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change.
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2) Changes usb_get_dev() referencing a get_device() whose CRC has
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changed, causing the symbol and the new CRC to be included in the
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__version section of the final module.
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This makes the final module unloadable for the target kernel.
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See "Exported symbol versioning" of the patch author guide for more
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detail.
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---
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drivers/base/core.c | 2 ++
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drivers/usb/core/usb.c | 2 ++
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2 files changed, 4 insertions(+)
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diff --git a/drivers/base/core.c b/drivers/base/core.c
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index b9a71137208..4af27e069c2 100644
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--- a/drivers/base/core.c
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+++ b/drivers/base/core.c
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@@ -31,6 +31,8 @@
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#include "base.h"
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#include "power/power.h"
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+#include <linux/blktrace_api.h>
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+
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#ifdef CONFIG_SYSFS_DEPRECATED
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#ifdef CONFIG_SYSFS_DEPRECATED_V2
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long sysfs_deprecated = 1;
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diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
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index f9db3660999..bece0bf4f5a 100644
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--- a/drivers/usb/core/usb.c
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+++ b/drivers/usb/core/usb.c
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@@ -691,6 +691,8 @@ EXPORT_SYMBOL_GPL(usb_alloc_dev);
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*/
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struct usb_device *usb_get_dev(struct usb_device *dev)
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{
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+ barrier();
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+
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if (dev)
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get_device(&dev->dev);
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return dev;
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--
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2.21.1
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