[Xen-changelog] [xen stable-4.4] x86: rate-limit logging in do_xen{oprof, pmu}_op()

[patchbot@xxxxxxx]

commit 0613780df68c4a35a0bde1584daea0697666ef01
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Oct 29 14:15:22 2015 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Oct 29 14:15:22 2015 +0100

    x86: rate-limit logging in do_xen{oprof,pmu}_op()
    
    Some of the sub-ops are acessible to all guests, and hence should be
    rate-limited. In the xenoprof case, just like for XSA-146, include them
    only in debug builds. Since the vPMU code is rather new, allow them to
    be always present, but downgrade them to (rate limited) guest messages.
    
    This is CVE-2015-7971 / XSA-152.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    master commit: 95e7415843b94c346e5ba8682665f508f220e04b
    master date: 2015-10-29 13:37:19 +0100
---
 xen/common/xenoprof.c |    9 +++------
 1 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/xen/common/xenoprof.c b/xen/common/xenoprof.c
index 4703142..abcb947 100644
--- a/xen/common/xenoprof.c
+++ b/xen/common/xenoprof.c
@@ -670,15 +670,13 @@ ret_t do_xenoprof_op(int op, XEN_GUEST_HANDLE_PARAM(void) 
arg)
     
     if ( (op < 0) || (op > XENOPROF_last_op) )
     {
-        printk("xenoprof: invalid operation %d for domain %d\n",
-               op, current->domain->domain_id);
+        gdprintk(XENLOG_DEBUG, "invalid operation %d\n", op);
         return -EINVAL;
     }
 
     if ( !NONPRIV_OP(op) && (current->domain != xenoprof_primary_profiler) )
     {
-        printk("xenoprof: dom %d denied privileged operation %d\n",
-               current->domain->domain_id, op);
+        gdprintk(XENLOG_DEBUG, "denied privileged operation %d\n", op);
         return -EPERM;
     }
 
@@ -901,8 +899,7 @@ ret_t do_xenoprof_op(int op, XEN_GUEST_HANDLE_PARAM(void) 
arg)
     spin_unlock(&xenoprof_lock);
 
     if ( ret < 0 )
-        printk("xenoprof: operation %d failed for dom %d (status : %d)\n",
-               op, current->domain->domain_id, ret);
+        gdprintk(XENLOG_DEBUG, "operation %d failed: %d\n", op, ret);
 
     return ret;
 }
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.4

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