diff options
Diffstat (limited to 'pkg/sentry/arch/stack.go')
| -rw-r--r-- | pkg/sentry/arch/stack.go | 44 |
1 files changed, 23 insertions, 21 deletions
diff --git a/pkg/sentry/arch/stack.go b/pkg/sentry/arch/stack.go index 5f06c751d..65a794c7c 100644 --- a/pkg/sentry/arch/stack.go +++ b/pkg/sentry/arch/stack.go @@ -16,18 +16,20 @@ package arch import ( "gvisor.dev/gvisor/pkg/context" + "gvisor.dev/gvisor/pkg/hostarch" "gvisor.dev/gvisor/pkg/marshal/primitive" + "gvisor.dev/gvisor/pkg/usermem" ) -// Stack is a simple wrapper around a usermem.IO and an address. Stack +// Stack is a simple wrapper around a hostarch.IO and an address. Stack // implements marshal.CopyContext, and marshallable values can be pushed or // popped from the stack through the marshal.Marshallable interface. // // Stack is not thread-safe. type Stack struct { // Our arch info. - // We use this for automatic Native conversion of usermem.Addrs during + // We use this for automatic Native conversion of hostarch.Addrs during // Push() and Pop(). Arch Context @@ -35,7 +37,7 @@ type Stack struct { IO usermem.IO // Our current stack bottom. - Bottom usermem.Addr + Bottom hostarch.Addr // Scratch buffer used for marshalling to avoid having to repeatedly // allocate scratch memory. @@ -59,20 +61,20 @@ func (s *Stack) CopyScratchBuffer(size int) []byte { // StackBottomMagic is the special address callers must past to all stack // marshalling operations to cause the src/dst address to be computed based on // the current end of the stack. -const StackBottomMagic = ^usermem.Addr(0) // usermem.Addr(-1) +const StackBottomMagic = ^hostarch.Addr(0) // hostarch.Addr(-1) // CopyOutBytes implements marshal.CopyContext.CopyOutBytes. CopyOutBytes // computes an appropriate address based on the current end of the // stack. Callers use the sentinel address StackBottomMagic to marshal methods // to indicate this. -func (s *Stack) CopyOutBytes(sentinel usermem.Addr, b []byte) (int, error) { +func (s *Stack) CopyOutBytes(sentinel hostarch.Addr, b []byte) (int, error) { if sentinel != StackBottomMagic { panic("Attempted to copy out to stack with absolute address") } c := len(b) - n, err := s.IO.CopyOut(context.Background(), s.Bottom-usermem.Addr(c), b, usermem.IOOpts{}) + n, err := s.IO.CopyOut(context.Background(), s.Bottom-hostarch.Addr(c), b, usermem.IOOpts{}) if err == nil && n == c { - s.Bottom -= usermem.Addr(n) + s.Bottom -= hostarch.Addr(n) } return n, err } @@ -81,21 +83,21 @@ func (s *Stack) CopyOutBytes(sentinel usermem.Addr, b []byte) (int, error) { // an appropriate address based on the current end of the stack. Callers must // use the sentinel address StackBottomMagic to marshal methods to indicate // this. -func (s *Stack) CopyInBytes(sentinel usermem.Addr, b []byte) (int, error) { +func (s *Stack) CopyInBytes(sentinel hostarch.Addr, b []byte) (int, error) { if sentinel != StackBottomMagic { panic("Attempted to copy in from stack with absolute address") } n, err := s.IO.CopyIn(context.Background(), s.Bottom, b, usermem.IOOpts{}) if err == nil { - s.Bottom += usermem.Addr(n) + s.Bottom += hostarch.Addr(n) } return n, err } // Align aligns the stack to the given offset. func (s *Stack) Align(offset int) { - if s.Bottom%usermem.Addr(offset) != 0 { - s.Bottom -= (s.Bottom % usermem.Addr(offset)) + if s.Bottom%hostarch.Addr(offset) != 0 { + s.Bottom -= (s.Bottom % hostarch.Addr(offset)) } } @@ -119,16 +121,16 @@ func (s *Stack) PushNullTerminatedByteSlice(bs []byte) (int, error) { // stack. type StackLayout struct { // ArgvStart is the beginning of the argument vector. - ArgvStart usermem.Addr + ArgvStart hostarch.Addr // ArgvEnd is the end of the argument vector. - ArgvEnd usermem.Addr + ArgvEnd hostarch.Addr // EnvvStart is the beginning of the environment vector. - EnvvStart usermem.Addr + EnvvStart hostarch.Addr // EnvvEnd is the end of the environment vector. - EnvvEnd usermem.Addr + EnvvEnd hostarch.Addr } // Load pushes the given args, env and aux vector to the stack using the @@ -148,7 +150,7 @@ func (s *Stack) Load(args []string, env []string, aux Auxv) (StackLayout, error) // to be in this order. See: https://www.uclibc.org/docs/psABI-x86_64.pdf // page 29. l.EnvvEnd = s.Bottom - envAddrs := make([]usermem.Addr, len(env)) + envAddrs := make([]hostarch.Addr, len(env)) for i := len(env) - 1; i >= 0; i-- { if _, err := s.PushNullTerminatedByteSlice([]byte(env[i])); err != nil { return StackLayout{}, err @@ -159,7 +161,7 @@ func (s *Stack) Load(args []string, env []string, aux Auxv) (StackLayout, error) // Push our strings. l.ArgvEnd = s.Bottom - argAddrs := make([]usermem.Addr, len(args)) + argAddrs := make([]hostarch.Addr, len(args)) for i := len(args) - 1; i >= 0; i-- { if _, err := s.PushNullTerminatedByteSlice([]byte(args[i])); err != nil { return StackLayout{}, err @@ -178,7 +180,7 @@ func (s *Stack) Load(args []string, env []string, aux Auxv) (StackLayout, error) argvSize := s.Arch.Width() * uint(len(args)+1) envvSize := s.Arch.Width() * uint(len(env)+1) auxvSize := s.Arch.Width() * 2 * uint(len(aux)+1) - total := usermem.Addr(argvSize) + usermem.Addr(envvSize) + usermem.Addr(auxvSize) + usermem.Addr(s.Arch.Width()) + total := hostarch.Addr(argvSize) + hostarch.Addr(envvSize) + hostarch.Addr(auxvSize) + hostarch.Addr(s.Arch.Width()) expectedBottom := s.Bottom - total if expectedBottom%32 != 0 { s.Bottom -= expectedBottom % 32 @@ -188,11 +190,11 @@ func (s *Stack) Load(args []string, env []string, aux Auxv) (StackLayout, error) // NOTE: We need an extra zero here per spec. // The Push function will automatically terminate // strings and arrays with a single null value. - auxv := make([]usermem.Addr, 0, len(aux)) + auxv := make([]hostarch.Addr, 0, len(aux)) for _, a := range aux { - auxv = append(auxv, usermem.Addr(a.Key), a.Value) + auxv = append(auxv, hostarch.Addr(a.Key), a.Value) } - auxv = append(auxv, usermem.Addr(0)) + auxv = append(auxv, hostarch.Addr(0)) _, err := s.pushAddrSliceAndTerminator(auxv) if err != nil { return StackLayout{}, err |