A userspace process (CPL=3) can access an i/o port if the bit corresponding to
the port is set to 0 in the I/O permission bitmap.
Configure the I/O permission bitmap address beyond the last valid byte in the
TSS so access to all i/o ports is blocked.
Signed-off-by: Liu Hua <sdu.liu@huawei.com>
Change-Id: I3df76980c3735491db768f7210e71703f86bb989
PiperOrigin-RevId: 257336518
Based on the guidelines at
https://opensource.google.com/docs/releasing/authors/.
1. $ rg -l "Google LLC" | xargs sed -i 's/Google LLC.*/The gVisor Authors./'
2. Manual fixup of "Google Inc" references.
3. Add AUTHORS file. Authors may request to be added to this file.
4. Point netstack AUTHORS to gVisor AUTHORS. Drop CONTRIBUTORS.
Fixes#209
PiperOrigin-RevId: 245823212
Change-Id: I64530b24ad021a7d683137459cafc510f5ee1de9
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
This reduces the number of floating point save/restore cycles required (since
we don't need to restore immediately following the switch, this always happens
in a known context) and allows the kernel hooks to capture state. This lets us
remove calls like "Current()".
PiperOrigin-RevId: 219552844
Change-Id: I7676fa2f6c18b9919718458aa888b832a7db8cab
Instead of associating a single PCID with each set of page tables (which
will reach the maximum quickly), allow a dynamic pool for each vCPU.
This is the same way that Linux operates. We also split management of
PCIDs out of the page tables themselves for simplicity.
PiperOrigin-RevId: 199585631
Change-Id: I42f3486ada3cb2a26f623c65ac279b473ae63201
Previously, the vCPU FS was always correct because it relied on the
reset coming out of the switch. When that doesn't occur, for example,
using bluepill directly, the FS value can be incorrect leading to
strange corruption.
This change is necessary for a subsequent change that enforces guest
mode for page table modifications, and it may reduce test flakiness.
(The problematic path may occur in tests, but does not occur in the
actual platform.)
PiperOrigin-RevId: 198648137
Change-Id: I513910a973dd8666c9a1d18cf78990964d6a644d
This is a refactor of ring0 and ring0/pagetables that changes from
individual arguments to opts structures. This should involve no
functional changes, but sets the stage for subsequent changes.
PiperOrigin-RevId: 198627556
Change-Id: Id4460340f6a73f0c793cd879324398139cd58ae9
As of Linux 4.15 (f29810335965ac1f7bcb501ee2af5f039f792416
KVM/x86: Check input paging mode when cs.l is set), KVM validates that
LMA is set along with LME.
PiperOrigin-RevId: 195047401
Change-Id: I8b43d8f758a85b1f58ccbd747dcacd4056ef3f66
Liu Hua
Michael Pratt
Yong He
Adin Scannell
Ian Gudger
Googler