Revision ccec44563b18a0ce90e2d4f332784b3cb25c8e9c authored by Paul Mackerras on 05 March 2016, 08:34:39 UTC, committed by Paul Mackerras on 08 March 2016, 02:36:42 UTC
Thomas Huth discovered that a guest could cause a hard hang of a host CPU by setting the Instruction Authority Mask Register (IAMR) to a suitable value. It turns out that this is because when the code was added to context-switch the new special-purpose registers (SPRs) that were added in POWER8, we forgot to add code to ensure that they were restored to a sane value on guest exit. This adds code to set those registers where a bad value could compromise the execution of the host kernel to a suitable neutral value on guest exit. Cc: stable@vger.kernel.org # v3.14+ Fixes: b005255e12a3 Reported-by: Thomas Huth <thuth@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
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| File | Mode | Size |
|---|---|---|
| Makefile | -rw-r--r-- | 377 bytes |
| compat.c | -rw-r--r-- | 19.1 KB |
| compat_mq.c | -rw-r--r-- | 3.9 KB |
| ipc_sysctl.c | -rw-r--r-- | 5.4 KB |
| mq_sysctl.c | -rw-r--r-- | 2.9 KB |
| mqueue.c | -rw-r--r-- | 35.7 KB |
| msg.c | -rw-r--r-- | 24.1 KB |
| msgutil.c | -rw-r--r-- | 3.6 KB |
| namespace.c | -rw-r--r-- | 4.0 KB |
| sem.c | -rw-r--r-- | 56.1 KB |
| shm.c | -rw-r--r-- | 32.5 KB |
| syscall.c | -rw-r--r-- | 2.3 KB |
| util.c | -rw-r--r-- | 21.1 KB |
| util.h | -rw-r--r-- | 6.4 KB |
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