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| author | Ian Jackson <Ian.Jackson@eu.citrix.com> | 2012-11-14 11:33:36 +0000 |
|---|---|---|
| committer | Ian Jackson <Ian.Jackson@eu.citrix.com> | 2012-11-14 11:33:36 +0000 |
| commit | f2e0eab9afae9245f38a31deeafe90953d63ea07 (patch) | |
| tree | 8e9f5caf6ee41801dcb7ab6ba0fc925bf82925a6 /tools/blktap2/drivers/hashtable_utility.c | |
| parent | d8c04e1456d0466c2845cf8754326e82e5e9cdf3 (diff) | |
| download | xen-f2e0eab9afae9245f38a31deeafe90953d63ea07.tar.gz xen-f2e0eab9afae9245f38a31deeafe90953d63ea07.tar.bz2 xen-f2e0eab9afae9245f38a31deeafe90953d63ea07.zip | |
VCPU/timers: Prevent overflow in calculations, leading to DoS vulnerability
The timer action for a vcpu periodic timer is to calculate the next
expiry time, and to reinsert itself into the timer queue. If the
deadline ends up in the past, Xen never leaves __do_softirq(). The
affected PCPU will stay in an infinite loop until Xen is killed by the
watchdog (if enabled).
This is a security problem, XSA-20 / CVE-2012-4535.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
xen-unstable changeset: 26148:bf58b94b3cef
Backport-requested-by: security@xen.org
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
Diffstat (limited to 'tools/blktap2/drivers/hashtable_utility.c')
0 files changed, 0 insertions, 0 deletions