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KVM: Prevent kvm_init from corrupting debugfs structures

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commit: 0ea4ed8e948c30f88c824c973ee4b9529015fe65 upstream
 
I'm seeing an oops condition when kvm-intel and kvm-amd are modprobe'd
during boot (say on an Intel system) and then rmmod'd:

   # modprobe kvm-intel
     kvm_init()
     kvm_init_debug()
     kvm_arch_init()  <-- stores debugfs dentries internally
     (success, etc)

   # modprobe kvm-amd
     kvm_init()
     kvm_init_debug() <-- second initialization clobbers kvm's
                          internal pointers to dentries
     kvm_arch_init()
     kvm_exit_debug() <-- and frees them

   # rmmod kvm-intel
     kvm_exit()
     kvm_exit_debug() <-- double free of debugfs files!

     *BOOM*

If execution gets to the end of kvm_init(), then the calling module has been
established as the kvm provider.  Move the debugfs initialization to the end of
the function, and remove the now-unnecessary call to kvm_exit_debug() from the
error path.  That way we avoid trampling on the debugfs entries and freeing
them twice.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Darrick J. Wong
2009-11-06 12:00:51 -02:00
committed by Greg Kroah-Hartman
parent 77608cc64e
commit 6fa5a4d48a
1 changed files with 3 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
virt/kvm/kvm_main.c
View File

@@ -2590,8 +2590,6 @@ int kvm_init(void *opaque, unsigned int vcpu_size,
int r;
int cpu;
kvm_init_debug();
r = kvm_arch_init(opaque);
if (r)
goto out_fail;
@@ -2658,6 +2656,8 @@ int kvm_init(void *opaque, unsigned int vcpu_size,
kvm_preempt_ops.sched_in = kvm_sched_in;
kvm_preempt_ops.sched_out = kvm_sched_out;
kvm_init_debug();
return 0;
out_free:
@@ -2679,7 +2679,6 @@ out_free_0:
__free_page(bad_page);
out:
kvm_arch_exit();
kvm_exit_debug();
out_fail:
return r;
}
@@ -2688,6 +2687,7 @@ EXPORT_SYMBOL_GPL(kvm_init);
void kvm_exit(void)
{
kvm_trace_cleanup();
kvm_exit_debug();
misc_deregister(&kvm_dev);
kmem_cache_destroy(kvm_vcpu_cache);
sysdev_unregister(&kvm_sysdev);
@@ -2697,7 +2697,6 @@ void kvm_exit(void)
on_each_cpu(hardware_disable, NULL, 1);
kvm_arch_hardware_unsetup();
kvm_arch_exit();
kvm_exit_debug();
free_cpumask_var(cpus_hardware_enabled);
__free_page(bad_page);
}