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kvm: use syscall.RawSyscall to fit the nosplit stack limit.

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unix.RawSyscall is a wrapper of syscall.RawSyscall:

gvisor.dev/gvisor/pkg/sentry/platform/kvm.sigsysHandler: nosplit stack over 792 byte limit
gvisor.dev/gvisor/pkg/sentry/platform/kvm.sigsysHandler<0>
    grows 16 bytes, calls gvisor.dev/gvisor/pkg/sentry/platform/kvm.seccompMmapHandler<0>
        grows 32 bytes, calls gvisor.dev/gvisor/pkg/sentry/platform/kvm.seccompMmapHandler<1>
            grows 144 bytes, calls gvisor.dev/gvisor/pkg/sentry/platform/kvm.(*machine).mapPhysical<1>
                grows 96 bytes, calls gvisor.dev/gvisor/pkg/sentry/platform/kvm.handleBluepillFault<1>
                    grows 128 bytes, calls gvisor.dev/gvisor/pkg/sentry/platform/kvm.(*machine).setMemoryRegion<1>
                        grows 160 bytes, calls golang.org/x/sys/unix.RawSyscall<0>
                            grows 0 bytes, calls syscall.RawSyscall<0>
                                grows 80 bytes, calls syscall.RawSyscall<1>
                                    grows 80 bytes, calls syscall.RawSyscall6<1>
                                        grows 96 bytes, calls runtime/internal/syscall.Syscall6<0>
                                        40 bytes over limit
This commit is contained in:
Andrei Vagin
2022-12-05 12:29:55 -08:00
parent 63d24c5581
commit 84a2d3cc83
1 changed files with 3 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
pkg/sentry/platform/kvm/machine_unsafe.go
+3 -1
View File
@@ -26,6 +26,7 @@ import (
"math"
"runtime"
"sync/atomic"
"syscall"
"unsafe"
"golang.org/x/sys/unix"
@@ -55,7 +56,8 @@ func (m *machine) setMemoryRegion(slot int, physical, length, virtual uintptr, f
}
// Set the region.
_, _, errno := unix.RawSyscall(
// Note: syscall.RawSyscall is used to fit the nosplit stack limit.
_, _, errno := syscall.RawSyscall(
unix.SYS_IOCTL,
uintptr(m.fd),
_KVM_SET_USER_MEMORY_REGION,