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-rw-r--r--pkg/sentry/syscalls/linux/sys_pipe.go14
-rw-r--r--pkg/sentry/syscalls/linux/vfs2/BUILD3
-rw-r--r--pkg/sentry/syscalls/linux/vfs2/fd.go17
-rw-r--r--pkg/sentry/syscalls/linux/vfs2/linux64_override_amd64.go4
-rw-r--r--pkg/sentry/syscalls/linux/vfs2/pipe.go63
-rw-r--r--pkg/sentry/syscalls/linux/vfs2/read_write.go8
6 files changed, 99 insertions, 10 deletions
diff --git a/pkg/sentry/syscalls/linux/sys_pipe.go b/pkg/sentry/syscalls/linux/sys_pipe.go
index 798344042..43c510930 100644
--- a/pkg/sentry/syscalls/linux/sys_pipe.go
+++ b/pkg/sentry/syscalls/linux/sys_pipe.go
@@ -24,6 +24,8 @@ import (
"gvisor.dev/gvisor/pkg/usermem"
)
+// LINT.IfChange
+
// pipe2 implements the actual system call with flags.
func pipe2(t *kernel.Task, addr usermem.Addr, flags uint) (uintptr, error) {
if flags&^(linux.O_NONBLOCK|linux.O_CLOEXEC) != 0 {
@@ -45,10 +47,12 @@ func pipe2(t *kernel.Task, addr usermem.Addr, flags uint) (uintptr, error) {
}
if _, err := t.CopyOut(addr, fds); err != nil {
- // The files are not closed in this case, the exact semantics
- // of this error case are not well defined, but they could have
- // already been observed by user space.
- return 0, syserror.EFAULT
+ for _, fd := range fds {
+ if file, _ := t.FDTable().Remove(fd); file != nil {
+ file.DecRef()
+ }
+ }
+ return 0, err
}
return 0, nil
}
@@ -69,3 +73,5 @@ func Pipe2(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Syscall
n, err := pipe2(t, addr, flags)
return n, nil, err
}
+
+// LINT.ThenChange(vfs2/pipe.go)
diff --git a/pkg/sentry/syscalls/linux/vfs2/BUILD b/pkg/sentry/syscalls/linux/vfs2/BUILD
index b32abfe59..6ff2d84d2 100644
--- a/pkg/sentry/syscalls/linux/vfs2/BUILD
+++ b/pkg/sentry/syscalls/linux/vfs2/BUILD
@@ -18,6 +18,7 @@ go_library(
"linux64_override_arm64.go",
"mmap.go",
"path.go",
+ "pipe.go",
"poll.go",
"read_write.go",
"setstat.go",
@@ -39,8 +40,10 @@ go_library(
"//pkg/gohacks",
"//pkg/sentry/arch",
"//pkg/sentry/fsbridge",
+ "//pkg/sentry/fsimpl/pipefs",
"//pkg/sentry/kernel",
"//pkg/sentry/kernel/auth",
+ "//pkg/sentry/kernel/pipe",
"//pkg/sentry/kernel/time",
"//pkg/sentry/limits",
"//pkg/sentry/loader",
diff --git a/pkg/sentry/syscalls/linux/vfs2/fd.go b/pkg/sentry/syscalls/linux/vfs2/fd.go
index 3afcea665..8181d80f4 100644
--- a/pkg/sentry/syscalls/linux/vfs2/fd.go
+++ b/pkg/sentry/syscalls/linux/vfs2/fd.go
@@ -18,6 +18,7 @@ import (
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/kernel"
+ "gvisor.dev/gvisor/pkg/sentry/kernel/pipe"
slinux "gvisor.dev/gvisor/pkg/sentry/syscalls/linux"
"gvisor.dev/gvisor/pkg/syserror"
)
@@ -140,6 +141,22 @@ func Fcntl(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Syscall
return uintptr(file.StatusFlags()), nil, nil
case linux.F_SETFL:
return 0, nil, file.SetStatusFlags(t, t.Credentials(), args[2].Uint())
+ case linux.F_SETPIPE_SZ:
+ pipefile, ok := file.Impl().(*pipe.VFSPipeFD)
+ if !ok {
+ return 0, nil, syserror.EBADF
+ }
+ n, err := pipefile.SetPipeSize(int64(args[2].Int()))
+ if err != nil {
+ return 0, nil, err
+ }
+ return uintptr(n), nil, nil
+ case linux.F_GETPIPE_SZ:
+ pipefile, ok := file.Impl().(*pipe.VFSPipeFD)
+ if !ok {
+ return 0, nil, syserror.EBADF
+ }
+ return uintptr(pipefile.PipeSize()), nil, nil
default:
// TODO(gvisor.dev/issue/1623): Everything else is not yet supported.
return 0, nil, syserror.EINVAL
diff --git a/pkg/sentry/syscalls/linux/vfs2/linux64_override_amd64.go b/pkg/sentry/syscalls/linux/vfs2/linux64_override_amd64.go
index 645e0bcb8..21eb98444 100644
--- a/pkg/sentry/syscalls/linux/vfs2/linux64_override_amd64.go
+++ b/pkg/sentry/syscalls/linux/vfs2/linux64_override_amd64.go
@@ -39,7 +39,7 @@ func Override(table map[uintptr]kernel.Syscall) {
table[19] = syscalls.Supported("readv", Readv)
table[20] = syscalls.Supported("writev", Writev)
table[21] = syscalls.Supported("access", Access)
- delete(table, 22) // pipe
+ table[22] = syscalls.Supported("pipe", Pipe)
table[23] = syscalls.Supported("select", Select)
table[32] = syscalls.Supported("dup", Dup)
table[33] = syscalls.Supported("dup2", Dup2)
@@ -151,7 +151,7 @@ func Override(table map[uintptr]kernel.Syscall) {
delete(table, 290) // eventfd2
table[291] = syscalls.Supported("epoll_create1", EpollCreate1)
table[292] = syscalls.Supported("dup3", Dup3)
- delete(table, 293) // pipe2
+ table[293] = syscalls.Supported("pipe2", Pipe2)
delete(table, 294) // inotify_init1
table[295] = syscalls.Supported("preadv", Preadv)
table[296] = syscalls.Supported("pwritev", Pwritev)
diff --git a/pkg/sentry/syscalls/linux/vfs2/pipe.go b/pkg/sentry/syscalls/linux/vfs2/pipe.go
new file mode 100644
index 000000000..4a01e4209
--- /dev/null
+++ b/pkg/sentry/syscalls/linux/vfs2/pipe.go
@@ -0,0 +1,63 @@
+// Copyright 2020 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package vfs2
+
+import (
+ "gvisor.dev/gvisor/pkg/abi/linux"
+ "gvisor.dev/gvisor/pkg/sentry/arch"
+ "gvisor.dev/gvisor/pkg/sentry/fsimpl/pipefs"
+ "gvisor.dev/gvisor/pkg/sentry/kernel"
+ "gvisor.dev/gvisor/pkg/sentry/vfs"
+ "gvisor.dev/gvisor/pkg/syserror"
+ "gvisor.dev/gvisor/pkg/usermem"
+)
+
+// Pipe implements Linux syscall pipe(2).
+func Pipe(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
+ addr := args[0].Pointer()
+ return 0, nil, pipe2(t, addr, 0)
+}
+
+// Pipe2 implements Linux syscall pipe2(2).
+func Pipe2(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
+ addr := args[0].Pointer()
+ flags := args[1].Int()
+ return 0, nil, pipe2(t, addr, flags)
+}
+
+func pipe2(t *kernel.Task, addr usermem.Addr, flags int32) error {
+ if flags&^(linux.O_NONBLOCK|linux.O_CLOEXEC) != 0 {
+ return syserror.EINVAL
+ }
+ r, w := pipefs.NewConnectedPipeFDs(t, t.Kernel().PipeMount(), uint32(flags&linux.O_NONBLOCK))
+ defer r.DecRef()
+ defer w.DecRef()
+
+ fds, err := t.NewFDsVFS2(0, []*vfs.FileDescription{r, w}, kernel.FDFlags{
+ CloseOnExec: flags&linux.O_CLOEXEC != 0,
+ })
+ if err != nil {
+ return err
+ }
+ if _, err := t.CopyOut(addr, fds); err != nil {
+ for _, fd := range fds {
+ if _, file := t.FDTable().Remove(fd); file != nil {
+ file.DecRef()
+ }
+ }
+ return err
+ }
+ return nil
+}
diff --git a/pkg/sentry/syscalls/linux/vfs2/read_write.go b/pkg/sentry/syscalls/linux/vfs2/read_write.go
index 898b190fd..6c6998f45 100644
--- a/pkg/sentry/syscalls/linux/vfs2/read_write.go
+++ b/pkg/sentry/syscalls/linux/vfs2/read_write.go
@@ -103,7 +103,7 @@ func read(t *kernel.Task, file *vfs.FileDescription, dst usermem.IOSequence, opt
// Issue the request and break out if it completes with anything other than
// "would block".
- n, err := file.Read(t, dst, opts)
+ n, err = file.Read(t, dst, opts)
total += n
if err != syserror.ErrWouldBlock {
break
@@ -248,7 +248,7 @@ func pread(t *kernel.Task, file *vfs.FileDescription, dst usermem.IOSequence, of
// Issue the request and break out if it completes with anything other than
// "would block".
- n, err := file.PRead(t, dst, offset+total, opts)
+ n, err = file.PRead(t, dst, offset+total, opts)
total += n
if err != syserror.ErrWouldBlock {
break
@@ -335,7 +335,7 @@ func write(t *kernel.Task, file *vfs.FileDescription, src usermem.IOSequence, op
// Issue the request and break out if it completes with anything other than
// "would block".
- n, err := file.Write(t, src, opts)
+ n, err = file.Write(t, src, opts)
total += n
if err != syserror.ErrWouldBlock {
break
@@ -480,7 +480,7 @@ func pwrite(t *kernel.Task, file *vfs.FileDescription, src usermem.IOSequence, o
// Issue the request and break out if it completes with anything other than
// "would block".
- n, err := file.PWrite(t, src, offset+total, opts)
+ n, err = file.PWrite(t, src, offset+total, opts)
total += n
if err != syserror.ErrWouldBlock {
break
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 15:35:40 +0000