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gvisor/ptrace: print guest registers if a stub stopped with unexpected code

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PiperOrigin-RevId: 252855280
This commit is contained in:
Andrei Vagin
2019-06-12 10:48:46 -07:00
committed by Shentubot
parent 356d1be140
commit 0d05a12fd3
2 changed files with 53 additions and 3 deletions
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pkg/sentry/platform/ptrace/subprocess.go
+16 -3
View File
@@ -21,6 +21,7 @@ import (
"sync"
"syscall"
"gvisor.googlesource.com/gvisor/pkg/log"
"gvisor.googlesource.com/gvisor/pkg/procid"
"gvisor.googlesource.com/gvisor/pkg/sentry/arch"
"gvisor.googlesource.com/gvisor/pkg/sentry/platform"
@@ -300,6 +301,18 @@ const (
killed
)
func (t *thread) dumpAndPanic(message string) {
var regs syscall.PtraceRegs
message += "\n"
if err := t.getRegs(&regs); err == nil {
message += dumpRegs(&regs)
} else {
log.Warningf("unable to get registers: %v", err)
}
message += fmt.Sprintf("stubStart\t = %016x\n", stubStart)
panic(message)
}
// wait waits for a stop event.
//
// Precondition: outcome is a valid waitOutcome.
@@ -320,7 +333,7 @@ func (t *thread) wait(outcome waitOutcome) syscall.Signal {
switch outcome {
case stopped:
if !status.Stopped() {
panic(fmt.Sprintf("ptrace status unexpected: got %v, wanted stopped", status))
t.dumpAndPanic(fmt.Sprintf("ptrace status unexpected: got %v, wanted stopped", status))
}
stopSig := status.StopSignal()
if stopSig == 0 {
@@ -334,12 +347,12 @@ func (t *thread) wait(outcome waitOutcome) syscall.Signal {
return stopSig
case killed:
if !status.Exited() && !status.Signaled() {
panic(fmt.Sprintf("ptrace status unexpected: got %v, wanted exited", status))
t.dumpAndPanic(fmt.Sprintf("ptrace status unexpected: got %v, wanted exited", status))
}
return syscall.Signal(status.ExitStatus())
default:
// Should not happen.
panic(fmt.Sprintf("unknown outcome: %v", outcome))
t.dumpAndPanic(fmt.Sprintf("unknown outcome: %v", outcome))
}
}
}
pkg/sentry/platform/ptrace/subprocess_amd64.go
+37
View File
@@ -17,6 +17,8 @@
package ptrace
import (
"fmt"
"strings"
"syscall"
"gvisor.googlesource.com/gvisor/pkg/sentry/arch"
@@ -102,3 +104,38 @@ func syscallReturnValue(regs *syscall.PtraceRegs) (uintptr, error) {
}
return uintptr(rval), nil
}
func dumpRegs(regs *syscall.PtraceRegs) string {
var m strings.Builder
fmt.Fprintf(&m, "Registers:\n")
fmt.Fprintf(&m, "\tR15\t = %016x\n", regs.R15)
fmt.Fprintf(&m, "\tR14\t = %016x\n", regs.R14)
fmt.Fprintf(&m, "\tR13\t = %016x\n", regs.R13)
fmt.Fprintf(&m, "\tR12\t = %016x\n", regs.R12)
fmt.Fprintf(&m, "\tRbp\t = %016x\n", regs.Rbp)
fmt.Fprintf(&m, "\tRbx\t = %016x\n", regs.Rbx)
fmt.Fprintf(&m, "\tR11\t = %016x\n", regs.R11)
fmt.Fprintf(&m, "\tR10\t = %016x\n", regs.R10)
fmt.Fprintf(&m, "\tR9\t = %016x\n", regs.R9)
fmt.Fprintf(&m, "\tR8\t = %016x\n", regs.R8)
fmt.Fprintf(&m, "\tRax\t = %016x\n", regs.Rax)
fmt.Fprintf(&m, "\tRcx\t = %016x\n", regs.Rcx)
fmt.Fprintf(&m, "\tRdx\t = %016x\n", regs.Rdx)
fmt.Fprintf(&m, "\tRsi\t = %016x\n", regs.Rsi)
fmt.Fprintf(&m, "\tRdi\t = %016x\n", regs.Rdi)
fmt.Fprintf(&m, "\tOrig_rax = %016x\n", regs.Orig_rax)
fmt.Fprintf(&m, "\tRip\t = %016x\n", regs.Rip)
fmt.Fprintf(&m, "\tCs\t = %016x\n", regs.Cs)
fmt.Fprintf(&m, "\tEflags\t = %016x\n", regs.Eflags)
fmt.Fprintf(&m, "\tRsp\t = %016x\n", regs.Rsp)
fmt.Fprintf(&m, "\tSs\t = %016x\n", regs.Ss)
fmt.Fprintf(&m, "\tFs_base\t = %016x\n", regs.Fs_base)
fmt.Fprintf(&m, "\tGs_base\t = %016x\n", regs.Gs_base)
fmt.Fprintf(&m, "\tDs\t = %016x\n", regs.Ds)
fmt.Fprintf(&m, "\tEs\t = %016x\n", regs.Es)
fmt.Fprintf(&m, "\tFs\t = %016x\n", regs.Fs)
fmt.Fprintf(&m, "\tGs\t = %016x\n", regs.Gs)
return m.String()
}