diff options
Diffstat (limited to 'pkg/sentry/platform/ptrace/subprocess_amd64.go')
| -rw-r--r-- | pkg/sentry/platform/ptrace/subprocess_amd64.go | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/pkg/sentry/platform/ptrace/subprocess_amd64.go b/pkg/sentry/platform/ptrace/subprocess_amd64.go index a70512913..4649a94a7 100644 --- a/pkg/sentry/platform/ptrace/subprocess_amd64.go +++ b/pkg/sentry/platform/ptrace/subprocess_amd64.go @@ -28,20 +28,13 @@ const ( // maximumUserAddress is the largest possible user address. maximumUserAddress = 0x7ffffffff000 + // stubInitAddress is the initial attempt link address for the stub. + stubInitAddress = 0x7fffffff0000 + // initRegsRipAdjustment is the size of the syscall instruction. initRegsRipAdjustment = 2 ) -// Linux kernel errnos which "should never be seen by user programs", but will -// be revealed to ptrace syscall exit tracing. -// -// These constants are used in subprocess.go. -const ( - ERESTARTSYS = syscall.Errno(512) - ERESTARTNOINTR = syscall.Errno(513) - ERESTARTNOHAND = syscall.Errno(514) -) - // resetSysemuRegs sets up emulation registers. // // This should be called prior to calling sysemu. @@ -139,3 +132,14 @@ func dumpRegs(regs *syscall.PtraceRegs) string { return m.String() } + +// adjustInitregsRip adjust the current register RIP value to +// be just before the system call instruction excution +func (t *thread) adjustInitRegsRip() { + t.initRegs.Rip -= initRegsRipAdjustment +} + +// Pass the expected PPID to the child via R15 when creating stub process +func initChildProcessPPID(initregs *syscall.PtraceRegs, ppid int32) { + initregs.R15 = uint64(ppid) +} |