diff options
| author | Yong He <chenglang.hy@alibaba-inc.com> | 2019-03-21 22:03:34 -0700 |
|---|---|---|
| committer | Shentubot <shentubot@google.com> | 2019-03-21 22:04:50 -0700 |
| commit | 45ba52f8246a7060da48e250512a734a79187adf (patch) | |
| tree | a01266d3f33443001b5cc7f7ec6a06f35d37fdd0 | |
| parent | 7d0227ff16f4397924fb008a7452f6ed3f8205e0 (diff) | |
Allow BP and OF can be called from user space
Change the DPL from 0 to 3 for Breakpoint and Overflow,
then user space could trigger Breakpoint and Overflow
as excepected.
Change-Id: Ibead65fb8c98b32b7737f316db93b3a8d9dcd648
PiperOrigin-RevId: 239736648
| -rw-r--r-- | pkg/sentry/platform/ring0/kernel_amd64.go | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/pkg/sentry/platform/ring0/kernel_amd64.go b/pkg/sentry/platform/ring0/kernel_amd64.go index 9e8c56a54..5ed4342dd 100644 --- a/pkg/sentry/platform/ring0/kernel_amd64.go +++ b/pkg/sentry/platform/ring0/kernel_amd64.go @@ -27,9 +27,15 @@ func (k *Kernel) init(opts KernelOpts) { // Setup the IDT, which is uniform. for v, handler := range handlers { + // Allow Breakpoint and Overflow to be called from all + // privilege levels. + dpl := 0 + if v == Breakpoint || v == Overflow { + dpl = 3 + } // Note that we set all traps to use the interrupt stack, this // is defined below when setting up the TSS. - k.globalIDT[v].setInterrupt(Kcode, uint64(kernelFunc(handler)), 0 /* dpl */, 1 /* ist */) + k.globalIDT[v].setInterrupt(Kcode, uint64(kernelFunc(handler)), dpl, 1 /* ist */) } } |