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| author | Joerg Roedel <[email protected]> | 2011-01-14 15:45:01 +0000 |
|---|---|---|
| committer | Avi Kivity <[email protected]> | 2011-02-09 16:31:36 +0000 |
| commit | 893a5ab6ee7d51b231ed45aa844f8088642cb6bf (patch) | |
| tree | 9bb299eb2b957b47371d09fd33a307882e7b9e7a /net/unix/af_unix.c | |
| parent | Revert "exofs: Set i_mapping->backing_dev_info anyway" (diff) | |
| download | kernel-893a5ab6ee7d51b231ed45aa844f8088642cb6bf.tar.gz kernel-893a5ab6ee7d51b231ed45aa844f8088642cb6bf.zip | |
KVM: SVM: Make sure KERNEL_GS_BASE is valid when loading gs_index
The gs_index loading code uses the swapgs instruction to
switch to the user gs_base temporarily. This is unsave in an
lightweight exit-path in KVM on AMD because the
KERNEL_GS_BASE MSR is switches lazily. An NMI happening in
the critical path of load_gs_index may use the wrong GS_BASE
value then leading to unpredictable behavior, e.g. a
triple-fault.
This patch fixes the issue by making sure that load_gs_index
is called only with a valid KERNEL_GS_BASE value loaded in
KVM.
Signed-off-by: Joerg Roedel <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
Diffstat (limited to 'net/unix/af_unix.c')
0 files changed, 0 insertions, 0 deletions