mirror of https://github.com/dynup/kpatch
91 lines
2.5 KiB
Diff
91 lines
2.5 KiB
Diff
From 08078d00ab1749a6f84148a00d8d26572af4ec97 Mon Sep 17 00:00:00 2001
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Message-Id: <08078d00ab1749a6f84148a00d8d26572af4ec97.1586900628.git.jpoimboe@redhat.com>
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From: Josh Poimboeuf <jpoimboe@redhat.com>
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Date: Tue, 14 Apr 2020 15:17:51 -0500
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Subject: [PATCH] kpatch module integration test
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This tests several things related to the patching of modules:
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- 'kpatch_string' tests the referencing of a symbol which is outside the
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.o, but inside the patch module.
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- alternatives patching (.altinstructions)
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- paravirt patching (.parainstructions)
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- jump labels (5.8+ kernels only) -- including dynamic printk
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Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
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---
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fs/nfsd/export.c | 30 ++++++++++++++++++++++++++++++
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net/netlink/af_netlink.c | 5 +++++
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2 files changed, 35 insertions(+)
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diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
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index a1143f7c2201..253c15ad82b2 100644
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--- a/fs/nfsd/export.c
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+++ b/fs/nfsd/export.c
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@@ -1196,15 +1196,45 @@ static void exp_flags(struct seq_file *m, int flag, int fsid,
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}
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}
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+#include <linux/version.h>
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+extern char *kpatch_string(void);
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+
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static int e_show(struct seq_file *m, void *p)
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{
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struct cache_head *cp = p;
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struct svc_export *exp = container_of(cp, struct svc_export, h);
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struct cache_detail *cd = m->private;
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+#ifdef CONFIG_X86_64
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+ unsigned long long sched_clock;
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+
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+ alternative("ud2", "call yield", X86_FEATURE_ALWAYS);
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+ alternative("call yield", "ud2", X86_FEATURE_IA64);
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+
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+ sched_clock = paravirt_sched_clock();
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+ if (!jiffies)
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+ printk("kpatch: sched_clock: %llu\n", sched_clock);
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+#endif
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+
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+ pr_debug("kpatch: pr_debug() test\n");
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+
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+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 8, 0)
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+{
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+ static DEFINE_STATIC_KEY_TRUE(kpatch_key);
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+
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+ if (static_branch_unlikely(&mcsafe_key))
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+ printk("kpatch: mcsafe_key\n");
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+
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+ BUG_ON(!static_branch_likely(&kpatch_key));
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+ static_branch_disable(&kpatch_key);
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+ BUG_ON(static_branch_likely(&kpatch_key));
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+ static_branch_enable(&kpatch_key);
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+}
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+#endif
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if (p == SEQ_START_TOKEN) {
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seq_puts(m, "# Version 1.1\n");
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seq_puts(m, "# Path Client(Flags) # IPs\n");
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+ seq_puts(m, kpatch_string());
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return 0;
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}
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diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
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index 44fa4ea5df76..dc36ec2901b8 100644
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--- a/net/netlink/af_netlink.c
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+++ b/net/netlink/af_netlink.c
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@@ -2809,4 +2809,9 @@ static int __init netlink_proto_init(void)
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panic("netlink_init: Cannot allocate nl_table\n");
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}
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+char *kpatch_string(void)
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+{
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+ return "# kpatch\n";
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+}
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+
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core_initcall(netlink_proto_init);
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--
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2.21.1
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