[syserror] Add conversions to linuxerr with temporary Equals method.

Add Equals method to compare syserror and unix.Errno errors to linuxerr errors.
This will facilitate removal of syserror definitions in a followup, and
finding needed conversions from unix.Errno to linuxerr.

PiperOrigin-RevId: 380909667

31 files changed, 107 insertions, 80 deletions

diff --git a/pkg/sentry/fsimpl/ext/BUILD b/pkg/sentry/fsimpl/ext/BUILD
index 2dbc6bfd5..1060b5301 100644
--- a/pkg/sentry/fsimpl/ext/BUILD
+++ b/pkg/sentry/fsimpl/ext/BUILD
@@ -88,13 +88,13 @@ go_test(
     deps = [
         "//pkg/abi/linux",
         "//pkg/context",
+        "//pkg/errors/linuxerr",
         "//pkg/fspath",
         "//pkg/marshal/primitive",
         "//pkg/sentry/contexttest",
         "//pkg/sentry/fsimpl/ext/disklayout",
         "//pkg/sentry/kernel/auth",
         "//pkg/sentry/vfs",
-        "//pkg/syserror",
         "//pkg/test/testutil",
         "//pkg/usermem",
         "@com_github_google_go_cmp//cmp:go_default_library",
diff --git a/pkg/sentry/fsimpl/ext/ext_test.go b/pkg/sentry/fsimpl/ext/ext_test.go
index d9fd4590c..db712e71f 100644
--- a/pkg/sentry/fsimpl/ext/ext_test.go
+++ b/pkg/sentry/fsimpl/ext/ext_test.go
@@ -26,12 +26,12 @@ import (
 	"github.com/google/go-cmp/cmp/cmpopts"
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/fspath"
 	"gvisor.dev/gvisor/pkg/sentry/contexttest"
 	"gvisor.dev/gvisor/pkg/sentry/fsimpl/ext/disklayout"
 	"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
 	"gvisor.dev/gvisor/pkg/sentry/vfs"
-	"gvisor.dev/gvisor/pkg/syserror"
 	"gvisor.dev/gvisor/pkg/test/testutil"
 	"gvisor.dev/gvisor/pkg/usermem"
 )
@@ -173,7 +173,7 @@ func TestSeek(t *testing.T) {
 			}
 
 			// EINVAL should be returned if the resulting offset is negative.
-			if _, err := fd.Seek(ctx, -1, linux.SEEK_SET); err != syserror.EINVAL {
+			if _, err := fd.Seek(ctx, -1, linux.SEEK_SET); !linuxerr.Equals(linuxerr.EINVAL, err) {
 				t.Errorf("expected error EINVAL but got %v", err)
 			}
 
@@ -187,7 +187,7 @@ func TestSeek(t *testing.T) {
 			}
 
 			// EINVAL should be returned if the resulting offset is negative.
-			if _, err := fd.Seek(ctx, -(size + 2), linux.SEEK_CUR); err != syserror.EINVAL {
+			if _, err := fd.Seek(ctx, -(size + 2), linux.SEEK_CUR); !linuxerr.Equals(linuxerr.EINVAL, err) {
 				t.Errorf("expected error EINVAL but got %v", err)
 			}
 
@@ -204,7 +204,7 @@ func TestSeek(t *testing.T) {
 				}
 
 				// EINVAL should be returned if the resulting offset is negative.
-				if _, err := fd.Seek(ctx, -(size + 1), linux.SEEK_END); err != syserror.EINVAL {
+				if _, err := fd.Seek(ctx, -(size + 1), linux.SEEK_END); !linuxerr.Equals(linuxerr.EINVAL, err) {
 					t.Errorf("expected error EINVAL but got %v", err)
 				}
 			}
diff --git a/pkg/sentry/fsimpl/fuse/BUILD b/pkg/sentry/fsimpl/fuse/BUILD
index 3a4777fbe..871df5984 100644
--- a/pkg/sentry/fsimpl/fuse/BUILD
+++ b/pkg/sentry/fsimpl/fuse/BUILD
@@ -46,6 +46,7 @@ go_library(
     deps = [
         "//pkg/abi/linux",
         "//pkg/context",
+        "//pkg/errors/linuxerr",
         "//pkg/hostarch",
         "//pkg/log",
         "//pkg/marshal",
@@ -76,6 +77,7 @@ go_test(
     library = ":fuse",
     deps = [
         "//pkg/abi/linux",
+        "//pkg/errors/linuxerr",
         "//pkg/hostarch",
         "//pkg/marshal",
         "//pkg/sentry/fsimpl/testutil",
diff --git a/pkg/sentry/fsimpl/fuse/connection_test.go b/pkg/sentry/fsimpl/fuse/connection_test.go
index 78ea6a31e..1fddd858e 100644
--- a/pkg/sentry/fsimpl/fuse/connection_test.go
+++ b/pkg/sentry/fsimpl/fuse/connection_test.go
@@ -19,9 +19,9 @@ import (
 	"testing"
 
 	"golang.org/x/sys/unix"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/sentry/kernel"
 	"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
-	"gvisor.dev/gvisor/pkg/syserror"
 )
 
 // TestConnectionInitBlock tests if initialization
@@ -104,7 +104,7 @@ func TestConnectionAbort(t *testing.T) {
 	// After abort, Call() should return directly with ENOTCONN.
 	req := conn.NewRequest(creds, 0, 0, 0, testObj)
 	_, err = conn.Call(task, req)
-	if err != syserror.ENOTCONN {
+	if !linuxerr.Equals(linuxerr.ENOTCONN, err) {
 		t.Fatalf("Incorrect error code received for Call() after connection aborted")
 	}
 
diff --git a/pkg/sentry/fsimpl/fuse/fusefs.go b/pkg/sentry/fsimpl/fuse/fusefs.go
index 167c899e2..47794810c 100644
--- a/pkg/sentry/fsimpl/fuse/fusefs.go
+++ b/pkg/sentry/fsimpl/fuse/fusefs.go
@@ -23,6 +23,7 @@ import (
 
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/log"
 	"gvisor.dev/gvisor/pkg/marshal"
 	"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
@@ -440,7 +441,7 @@ func (i *inode) Open(ctx context.Context, rp *vfs.ResolvingPath, d *kernfs.Dentr
 		if err != nil {
 			return nil, err
 		}
-		if err := res.Error(); err == syserror.ENOSYS && !isDir {
+		if err := res.Error(); linuxerr.Equals(linuxerr.ENOSYS, err) && !isDir {
 			i.fs.conn.noOpen = true
 		} else if err != nil {
 			return nil, err
diff --git a/pkg/sentry/fsimpl/gofer/BUILD b/pkg/sentry/fsimpl/gofer/BUILD
index 368272f12..752060044 100644
--- a/pkg/sentry/fsimpl/gofer/BUILD
+++ b/pkg/sentry/fsimpl/gofer/BUILD
@@ -49,6 +49,7 @@ go_library(
     deps = [
         "//pkg/abi/linux",
         "//pkg/context",
+        "//pkg/errors/linuxerr",
         "//pkg/fd",
         "//pkg/fdnotifier",
         "//pkg/fspath",
diff --git a/pkg/sentry/fsimpl/gofer/filesystem.go b/pkg/sentry/fsimpl/gofer/filesystem.go
index eb09d54c3..af2b773c3 100644
--- a/pkg/sentry/fsimpl/gofer/filesystem.go
+++ b/pkg/sentry/fsimpl/gofer/filesystem.go
@@ -23,6 +23,7 @@ import (
 
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/fspath"
 	"gvisor.dev/gvisor/pkg/p9"
 	"gvisor.dev/gvisor/pkg/sentry/fsimpl/host"
@@ -255,7 +256,7 @@ func (fs *filesystem) getChildLocked(ctx context.Context, parent *dentry, name s
 
 	qid, file, attrMask, attr, err := parent.file.walkGetAttrOne(ctx, name)
 	if err != nil {
-		if err == syserror.ENOENT {
+		if linuxerr.Equals(linuxerr.ENOENT, err) {
 			parent.cacheNegativeLookupLocked(name)
 		}
 		return nil, err
@@ -382,7 +383,7 @@ func (fs *filesystem) doCreateAt(ctx context.Context, rp *vfs.ResolvingPath, dir
 		return syserror.EEXIST
 	}
 	checkExistence := func() error {
-		if child, err := fs.getChildLocked(ctx, parent, name, &ds); err != nil && err != syserror.ENOENT {
+		if child, err := fs.getChildLocked(ctx, parent, name, &ds); err != nil && !linuxerr.Equals(linuxerr.ENOENT, err) {
 			return err
 		} else if child != nil {
 			return syserror.EEXIST
@@ -715,7 +716,7 @@ func (fs *filesystem) MkdirAt(ctx context.Context, rp *vfs.ResolvingPath, opts v
 			mode |= linux.S_ISGID
 		}
 		if _, err := parent.file.mkdir(ctx, name, p9.FileMode(mode), (p9.UID)(creds.EffectiveKUID), p9.GID(kgid)); err != nil {
-			if !opts.ForSyntheticMountpoint || err == syserror.EEXIST {
+			if !opts.ForSyntheticMountpoint || linuxerr.Equals(linuxerr.EEXIST, err) {
 				return err
 			}
 			ctx.Infof("Failed to create remote directory %q: %v; falling back to synthetic directory", name, err)
@@ -752,7 +753,7 @@ func (fs *filesystem) MknodAt(ctx context.Context, rp *vfs.ResolvingPath, opts v
 	return fs.doCreateAt(ctx, rp, false /* dir */, func(parent *dentry, name string, ds **[]*dentry) error {
 		creds := rp.Credentials()
 		_, err := parent.file.mknod(ctx, name, (p9.FileMode)(opts.Mode), opts.DevMajor, opts.DevMinor, (p9.UID)(creds.EffectiveKUID), (p9.GID)(creds.EffectiveKGID))
-		if err != syserror.EPERM {
+		if !linuxerr.Equals(linuxerr.EPERM, err) {
 			return err
 		}
 
@@ -765,7 +766,7 @@ func (fs *filesystem) MknodAt(ctx context.Context, rp *vfs.ResolvingPath, opts v
 		case err == nil:
 			// Step succeeded, another file exists.
 			return syserror.EEXIST
-		case err != syserror.ENOENT:
+		case !linuxerr.Equals(linuxerr.ENOENT, err):
 			// Unexpected error.
 			return err
 		}
@@ -862,7 +863,7 @@ afterTrailingSymlink:
 	// Determine whether or not we need to create a file.
 	parent.dirMu.Lock()
 	child, _, err := fs.stepLocked(ctx, rp, parent, false /* mayFollowSymlinks */, &ds)
-	if err == syserror.ENOENT && mayCreate {
+	if linuxerr.Equals(linuxerr.ENOENT, err) && mayCreate {
 		if parent.isSynthetic() {
 			parent.dirMu.Unlock()
 			return nil, syserror.EPERM
@@ -1033,7 +1034,7 @@ func (d *dentry) openSpecialFile(ctx context.Context, mnt *vfs.Mount, opts *vfs.
 retry:
 	h, err := openHandle(ctx, d.file, ats.MayRead(), ats.MayWrite(), opts.Flags&linux.O_TRUNC != 0)
 	if err != nil {
-		if isBlockingOpenOfNamedPipe && ats == vfs.MayWrite && err == syserror.ENXIO {
+		if isBlockingOpenOfNamedPipe && ats == vfs.MayWrite && linuxerr.Equals(linuxerr.ENXIO, err) {
 			// An attempt to open a named pipe with O_WRONLY|O_NONBLOCK fails
 			// with ENXIO if opening the same named pipe with O_WRONLY would
 			// block because there are no readers of the pipe.
@@ -1284,7 +1285,7 @@ func (fs *filesystem) RenameAt(ctx context.Context, rp *vfs.ResolvingPath, oldPa
 		return syserror.ENOENT
 	}
 	replaced, err := fs.getChildLocked(ctx, newParent, newName, &ds)
-	if err != nil && err != syserror.ENOENT {
+	if err != nil && !linuxerr.Equals(linuxerr.ENOENT, err) {
 		return err
 	}
 	var replacedVFSD *vfs.Dentry
diff --git a/pkg/sentry/fsimpl/gofer/gofer.go b/pkg/sentry/fsimpl/gofer/gofer.go
index cf69e1b7a..496e31e34 100644
--- a/pkg/sentry/fsimpl/gofer/gofer.go
+++ b/pkg/sentry/fsimpl/gofer/gofer.go
@@ -46,6 +46,7 @@ import (
 	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/hostarch"
 	"gvisor.dev/gvisor/pkg/log"
 	"gvisor.dev/gvisor/pkg/p9"
@@ -1763,7 +1764,7 @@ func (d *dentry) ensureSharedHandle(ctx context.Context, read, write, trunc bool
 		openReadable := !d.readFile.isNil() || read
 		openWritable := !d.writeFile.isNil() || write
 		h, err := openHandle(ctx, d.file, openReadable, openWritable, trunc)
-		if err == syserror.EACCES && (openReadable != read || openWritable != write) {
+		if linuxerr.Equals(linuxerr.EACCES, err) && (openReadable != read || openWritable != write) {
 			// It may not be possible to use a single handle for both
 			// reading and writing, since permissions on the file may have
 			// changed to e.g. disallow reading after previously being
diff --git a/pkg/sentry/fsimpl/gofer/host_named_pipe.go b/pkg/sentry/fsimpl/gofer/host_named_pipe.go
index c7bf10007..398288ee3 100644
--- a/pkg/sentry/fsimpl/gofer/host_named_pipe.go
+++ b/pkg/sentry/fsimpl/gofer/host_named_pipe.go
@@ -21,6 +21,7 @@ import (
 
 	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/syserror"
 )
 
@@ -78,7 +79,7 @@ func nonblockingPipeHasWriter(fd int32) (bool, error) {
 	defer tempPipeMu.Unlock()
 	// Copy 1 byte from fd into the temporary pipe.
 	n, err := unix.Tee(int(fd), tempPipeWriteFD, 1, unix.SPLICE_F_NONBLOCK)
-	if err == syserror.EAGAIN {
+	if linuxerr.Equals(linuxerr.EAGAIN, err) {
 		// The pipe represented by fd is empty, but has a writer.
 		return true, nil
 	}
diff --git a/pkg/sentry/fsimpl/gofer/save_restore.go b/pkg/sentry/fsimpl/gofer/save_restore.go
index 83e841a51..e67422a2f 100644
--- a/pkg/sentry/fsimpl/gofer/save_restore.go
+++ b/pkg/sentry/fsimpl/gofer/save_restore.go
@@ -21,13 +21,13 @@ import (
 
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/fdnotifier"
 	"gvisor.dev/gvisor/pkg/hostarch"
 	"gvisor.dev/gvisor/pkg/p9"
 	"gvisor.dev/gvisor/pkg/refsvfs2"
 	"gvisor.dev/gvisor/pkg/safemem"
 	"gvisor.dev/gvisor/pkg/sentry/vfs"
-	"gvisor.dev/gvisor/pkg/syserror"
 )
 
 type saveRestoreContextID int
@@ -92,7 +92,7 @@ func (fd *specialFileFD) savePipeData(ctx context.Context) error {
 			fd.buf = append(fd.buf, buf[:n]...)
 		}
 		if err != nil {
-			if err == io.EOF || err == syserror.EAGAIN {
+			if err == io.EOF || linuxerr.Equals(linuxerr.EAGAIN, err) {
 				break
 			}
 			return err
diff --git a/pkg/sentry/fsimpl/gofer/special_file.go b/pkg/sentry/fsimpl/gofer/special_file.go
index c12444b7e..3d7b5506e 100644
--- a/pkg/sentry/fsimpl/gofer/special_file.go
+++ b/pkg/sentry/fsimpl/gofer/special_file.go
@@ -20,6 +20,7 @@ import (
 	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/fdnotifier"
 	"gvisor.dev/gvisor/pkg/metric"
 	"gvisor.dev/gvisor/pkg/p9"
@@ -228,7 +229,7 @@ func (fd *specialFileFD) PRead(ctx context.Context, dst usermem.IOSequence, offs
 	// Just buffer the read instead.
 	buf := make([]byte, dst.NumBytes())
 	n, err := fd.handle.readToBlocksAt(ctx, safemem.BlockSeqOf(safemem.BlockFromSafeSlice(buf)), uint64(offset))
-	if err == syserror.EAGAIN {
+	if linuxerr.Equals(linuxerr.EAGAIN, err) {
 		err = syserror.ErrWouldBlock
 	}
 	if n == 0 {
@@ -316,7 +317,7 @@ func (fd *specialFileFD) pwrite(ctx context.Context, src usermem.IOSequence, off
 		return 0, offset, copyErr
 	}
 	n, err := fd.handle.writeFromBlocksAt(ctx, safemem.BlockSeqOf(safemem.BlockFromSafeSlice(buf[:copied])), uint64(offset))
-	if err == syserror.EAGAIN {
+	if linuxerr.Equals(linuxerr.EAGAIN, err) {
 		err = syserror.ErrWouldBlock
 	}
 	// Update offset if the offset is valid.
diff --git a/pkg/sentry/fsimpl/host/BUILD b/pkg/sentry/fsimpl/host/BUILD
index b94dfeb7f..f2f83796c 100644
--- a/pkg/sentry/fsimpl/host/BUILD
+++ b/pkg/sentry/fsimpl/host/BUILD
@@ -45,6 +45,7 @@ go_library(
     deps = [
         "//pkg/abi/linux",
         "//pkg/context",
+        "//pkg/errors/linuxerr",
         "//pkg/fdnotifier",
         "//pkg/fspath",
         "//pkg/hostarch",
diff --git a/pkg/sentry/fsimpl/host/host.go b/pkg/sentry/fsimpl/host/host.go
index a81f550b1..2dbfbdecf 100644
--- a/pkg/sentry/fsimpl/host/host.go
+++ b/pkg/sentry/fsimpl/host/host.go
@@ -24,6 +24,7 @@ import (
 	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/fdnotifier"
 	"gvisor.dev/gvisor/pkg/fspath"
 	"gvisor.dev/gvisor/pkg/hostarch"
@@ -109,7 +110,7 @@ type inode struct {
 func newInode(ctx context.Context, fs *filesystem, hostFD int, savable bool, fileType linux.FileMode, isTTY bool) (*inode, error) {
 	// Determine if hostFD is seekable.
 	_, err := unix.Seek(hostFD, 0, linux.SEEK_CUR)
-	seekable := err != syserror.ESPIPE
+	seekable := !linuxerr.Equals(linuxerr.ESPIPE, err)
 	// We expect regular files to be seekable, as this is required for them to
 	// be memory-mappable.
 	if !seekable && fileType == unix.S_IFREG {
@@ -301,7 +302,7 @@ func (i *inode) Stat(ctx context.Context, vfsfs *vfs.Filesystem, opts vfs.StatOp
 	mask := opts.Mask & linux.STATX_ALL
 	var s unix.Statx_t
 	err := unix.Statx(i.hostFD, "", int(unix.AT_EMPTY_PATH|opts.Sync), int(mask), &s)
-	if err == syserror.ENOSYS {
+	if linuxerr.Equals(linuxerr.ENOSYS, err) {
 		// Fallback to fstat(2), if statx(2) is not supported on the host.
 		//
 		// TODO(b/151263641): Remove fallback.
diff --git a/pkg/sentry/fsimpl/host/socket.go b/pkg/sentry/fsimpl/host/socket.go
index ca85f5601..8cce36212 100644
--- a/pkg/sentry/fsimpl/host/socket.go
+++ b/pkg/sentry/fsimpl/host/socket.go
@@ -21,6 +21,7 @@ import (
 	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/fdnotifier"
 	"gvisor.dev/gvisor/pkg/log"
 	"gvisor.dev/gvisor/pkg/sentry/socket/control"
@@ -160,7 +161,7 @@ func (c *ConnectedEndpoint) Send(ctx context.Context, data [][]byte, controlMess
 		// block (and only for stream sockets).
 		err = syserror.EAGAIN
 	}
-	if n > 0 && err != syserror.EAGAIN {
+	if n > 0 && !linuxerr.Equals(linuxerr.EAGAIN, err) {
 		// The caller may need to block to send more data, but
 		// otherwise there isn't anything that can be done about an
 		// error with a partial write.
diff --git a/pkg/sentry/fsimpl/host/tty.go b/pkg/sentry/fsimpl/host/tty.go
index 0f9e20a84..2cf360065 100644
--- a/pkg/sentry/fsimpl/host/tty.go
+++ b/pkg/sentry/fsimpl/host/tty.go
@@ -17,6 +17,7 @@ package host
 import (
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/marshal/primitive"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 	"gvisor.dev/gvisor/pkg/sentry/kernel"
@@ -211,7 +212,7 @@ func (t *TTYFileDescription) Ioctl(ctx context.Context, io usermem.IO, args arch
 		if err := t.checkChange(ctx, linux.SIGTTOU); err != nil {
 			// drivers/tty/tty_io.c:tiocspgrp() converts -EIO from tty_check_change()
 			// to -ENOTTY.
-			if err == syserror.EIO {
+			if linuxerr.Equals(linuxerr.EIO, err) {
 				return 0, syserror.ENOTTY
 			}
 			return 0, err
diff --git a/pkg/sentry/fsimpl/host/util.go b/pkg/sentry/fsimpl/host/util.go
index 63b465859..95d7ebe2e 100644
--- a/pkg/sentry/fsimpl/host/util.go
+++ b/pkg/sentry/fsimpl/host/util.go
@@ -17,7 +17,7 @@ package host
 import (
 	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/abi/linux"
-	"gvisor.dev/gvisor/pkg/syserror"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 )
 
 func toTimespec(ts linux.StatxTimestamp, omit bool) unix.Timespec {
@@ -44,5 +44,5 @@ func timespecToStatxTimestamp(ts unix.Timespec) linux.StatxTimestamp {
 // isBlockError checks if an error is EAGAIN or EWOULDBLOCK.
 // If so, they can be transformed into syserror.ErrWouldBlock.
 func isBlockError(err error) bool {
-	return err == syserror.EAGAIN || err == syserror.EWOULDBLOCK
+	return linuxerr.Equals(linuxerr.EAGAIN, err) || linuxerr.Equals(linuxerr.EWOULDBLOCK, err)
 }
diff --git a/pkg/sentry/fsimpl/kernfs/BUILD b/pkg/sentry/fsimpl/kernfs/BUILD
index b7d13cced..d53937db6 100644
--- a/pkg/sentry/fsimpl/kernfs/BUILD
+++ b/pkg/sentry/fsimpl/kernfs/BUILD
@@ -104,6 +104,7 @@ go_library(
     deps = [
         "//pkg/abi/linux",
         "//pkg/context",
+        "//pkg/errors/linuxerr",
         "//pkg/fspath",
         "//pkg/hostarch",
         "//pkg/log",
@@ -135,6 +136,7 @@ go_test(
         ":kernfs",
         "//pkg/abi/linux",
         "//pkg/context",
+        "//pkg/errors/linuxerr",
         "//pkg/log",
         "//pkg/refs",
         "//pkg/refsvfs2",
diff --git a/pkg/sentry/fsimpl/kernfs/filesystem.go b/pkg/sentry/fsimpl/kernfs/filesystem.go
index 8fac53c60..20319ab76 100644
--- a/pkg/sentry/fsimpl/kernfs/filesystem.go
+++ b/pkg/sentry/fsimpl/kernfs/filesystem.go
@@ -21,6 +21,7 @@ import (
 
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/fspath"
 	"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
 	"gvisor.dev/gvisor/pkg/sentry/socket/unix/transport"
@@ -411,7 +412,7 @@ func (fs *Filesystem) MkdirAt(ctx context.Context, rp *vfs.ResolvingPath, opts v
 	defer rp.Mount().EndWrite()
 	childI, err := parent.inode.NewDir(ctx, pc, opts)
 	if err != nil {
-		if !opts.ForSyntheticMountpoint || err == syserror.EEXIST {
+		if !opts.ForSyntheticMountpoint || linuxerr.Equals(linuxerr.EEXIST, err) {
 			return err
 		}
 		childI = newSyntheticDirectory(ctx, rp.Credentials(), opts.Mode)
@@ -546,7 +547,7 @@ afterTrailingSymlink:
 	}
 	// Determine whether or not we need to create a file.
 	child, err := fs.stepExistingLocked(ctx, rp, parent, false /* mayFollowSymlinks */)
-	if err == syserror.ENOENT {
+	if linuxerr.Equals(linuxerr.ENOENT, err) {
 		// Already checked for searchability above; now check for writability.
 		if err := parent.inode.CheckPermissions(ctx, rp.Credentials(), vfs.MayWrite); err != nil {
 			return nil, err
@@ -684,10 +685,12 @@ func (fs *Filesystem) RenameAt(ctx context.Context, rp *vfs.ResolvingPath, oldPa
 		}
 		return syserror.EBUSY
 	}
-	switch err := checkCreateLocked(ctx, rp.Credentials(), newName, dstDir); err {
-	case nil:
+
+	err = checkCreateLocked(ctx, rp.Credentials(), newName, dstDir)
+	switch {
+	case err == nil:
 		// Ok, continue with rename as replacement.
-	case syserror.EEXIST:
+	case linuxerr.Equals(linuxerr.EEXIST, err):
 		if noReplace {
 			// Won't overwrite existing node since RENAME_NOREPLACE was requested.
 			return syserror.EEXIST
diff --git a/pkg/sentry/fsimpl/kernfs/kernfs_test.go b/pkg/sentry/fsimpl/kernfs/kernfs_test.go
index 1cd3137e6..de046ce1f 100644
--- a/pkg/sentry/fsimpl/kernfs/kernfs_test.go
+++ b/pkg/sentry/fsimpl/kernfs/kernfs_test.go
@@ -22,6 +22,7 @@ import (
 	"github.com/google/go-cmp/cmp"
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/sentry/contexttest"
 	"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
 	"gvisor.dev/gvisor/pkg/sentry/fsimpl/testutil"
@@ -318,10 +319,10 @@ func TestDirFDReadWrite(t *testing.T) {
 	defer fd.DecRef(sys.Ctx)
 
 	// Read/Write should fail for directory FDs.
-	if _, err := fd.Read(sys.Ctx, usermem.BytesIOSequence([]byte{}), vfs.ReadOptions{}); err != syserror.EISDIR {
+	if _, err := fd.Read(sys.Ctx, usermem.BytesIOSequence([]byte{}), vfs.ReadOptions{}); !linuxerr.Equals(linuxerr.EISDIR, err) {
 		t.Fatalf("Read for directory FD failed with unexpected error: %v", err)
 	}
-	if _, err := fd.Write(sys.Ctx, usermem.BytesIOSequence([]byte{}), vfs.WriteOptions{}); err != syserror.EBADF {
+	if _, err := fd.Write(sys.Ctx, usermem.BytesIOSequence([]byte{}), vfs.WriteOptions{}); !linuxerr.Equals(linuxerr.EBADF, err) {
 		t.Fatalf("Write for directory FD failed with unexpected error: %v", err)
 	}
 }
diff --git a/pkg/sentry/fsimpl/overlay/BUILD b/pkg/sentry/fsimpl/overlay/BUILD
index 5504476c8..ed730e215 100644
--- a/pkg/sentry/fsimpl/overlay/BUILD
+++ b/pkg/sentry/fsimpl/overlay/BUILD
@@ -29,6 +29,7 @@ go_library(
     deps = [
         "//pkg/abi/linux",
         "//pkg/context",
+        "//pkg/errors/linuxerr",
         "//pkg/fspath",
         "//pkg/hostarch",
         "//pkg/log",
diff --git a/pkg/sentry/fsimpl/overlay/copy_up.go b/pkg/sentry/fsimpl/overlay/copy_up.go
index 45aa5a494..8fd51e9d0 100644
--- a/pkg/sentry/fsimpl/overlay/copy_up.go
+++ b/pkg/sentry/fsimpl/overlay/copy_up.go
@@ -20,6 +20,7 @@ import (
 
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/fspath"
 	"gvisor.dev/gvisor/pkg/hostarch"
 	"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
@@ -349,7 +350,7 @@ func (d *dentry) copyXattrsLocked(ctx context.Context) error {
 
 	lowerXattrs, err := vfsObj.ListXattrAt(ctx, d.fs.creds, lowerPop, 0)
 	if err != nil {
-		if err == syserror.EOPNOTSUPP {
+		if linuxerr.Equals(linuxerr.EOPNOTSUPP, err) {
 			// There are no guarantees as to the contents of lowerXattrs.
 			return nil
 		}
diff --git a/pkg/sentry/fsimpl/overlay/filesystem.go b/pkg/sentry/fsimpl/overlay/filesystem.go
index 6b6fa0bd5..81745bccd 100644
--- a/pkg/sentry/fsimpl/overlay/filesystem.go
+++ b/pkg/sentry/fsimpl/overlay/filesystem.go
@@ -21,6 +21,7 @@ import (
 
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/fspath"
 	"gvisor.dev/gvisor/pkg/log"
 	"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
@@ -218,7 +219,7 @@ func (fs *filesystem) lookupLocked(ctx context.Context, parent *dentry, name str
 			Start: parentVD,
 			Path:  childPath,
 		}, &vfs.GetDentryOptions{})
-		if err == syserror.ENOENT || err == syserror.ENAMETOOLONG {
+		if linuxerr.Equals(linuxerr.ENOENT, err) || linuxerr.Equals(linuxerr.ENAMETOOLONG, err) {
 			// The file doesn't exist on this layer. Proceed to the next one.
 			return true
 		}
@@ -352,7 +353,7 @@ func (fs *filesystem) lookupLayerLocked(ctx context.Context, parent *dentry, nam
 		}, &vfs.StatOptions{
 			Mask: linux.STATX_TYPE,
 		})
-		if err == syserror.ENOENT || err == syserror.ENAMETOOLONG {
+		if linuxerr.Equals(linuxerr.ENOENT, err) || linuxerr.Equals(linuxerr.ENAMETOOLONG, err) {
 			// The file doesn't exist on this layer. Proceed to the next
 			// one.
 			return true
@@ -811,7 +812,7 @@ afterTrailingSymlink:
 	// Determine whether or not we need to create a file.
 	parent.dirMu.Lock()
 	child, topLookupLayer, err := fs.stepLocked(ctx, rp, parent, false /* mayFollowSymlinks */, &ds)
-	if err == syserror.ENOENT && mayCreate {
+	if linuxerr.Equals(linuxerr.ENOENT, err) && mayCreate {
 		fd, err := fs.createAndOpenLocked(ctx, rp, parent, &opts, &ds, topLookupLayer == lookupLayerUpperWhiteout)
 		parent.dirMu.Unlock()
 		return fd, err
@@ -1094,7 +1095,7 @@ func (fs *filesystem) RenameAt(ctx context.Context, rp *vfs.ResolvingPath, oldPa
 		whiteouts     map[string]bool
 	)
 	replaced, replacedLayer, err = fs.getChildLocked(ctx, newParent, newName, &ds)
-	if err != nil && err != syserror.ENOENT {
+	if err != nil && !linuxerr.Equals(linuxerr.ENOENT, err) {
 		return err
 	}
 	if replaced != nil {
@@ -1177,7 +1178,7 @@ func (fs *filesystem) RenameAt(ctx context.Context, rp *vfs.ResolvingPath, oldPa
 				Root:  replaced.upperVD,
 				Start: replaced.upperVD,
 				Path:  fspath.Parse(whiteoutName),
-			}); err != nil && err != syserror.EEXIST {
+			}); err != nil && !linuxerr.Equals(linuxerr.EEXIST, err) {
 				panic(fmt.Sprintf("unrecoverable overlayfs inconsistency: failed to recreate deleted whiteout after RenameAt failure: %v", err))
 			}
 		}
@@ -1344,7 +1345,7 @@ func (fs *filesystem) RmdirAt(ctx context.Context, rp *vfs.ResolvingPath) error
 					Root:  child.upperVD,
 					Start: child.upperVD,
 					Path:  fspath.Parse(whiteoutName),
-				}); err != nil && err != syserror.EEXIST {
+				}); err != nil && !linuxerr.Equals(linuxerr.EEXIST, err) {
 					panic(fmt.Sprintf("unrecoverable overlayfs inconsistency: failed to recreate deleted whiteout after RmdirAt failure: %v", err))
 				}
 			}
diff --git a/pkg/sentry/fsimpl/proc/BUILD b/pkg/sentry/fsimpl/proc/BUILD
index 2b628bd55..1d3d2d95f 100644
--- a/pkg/sentry/fsimpl/proc/BUILD
+++ b/pkg/sentry/fsimpl/proc/BUILD
@@ -81,6 +81,7 @@ go_library(
     deps = [
         "//pkg/abi/linux",
         "//pkg/context",
+        "//pkg/errors/linuxerr",
         "//pkg/hostarch",
         "//pkg/log",
         "//pkg/refs",
@@ -119,6 +120,7 @@ go_test(
     deps = [
         "//pkg/abi/linux",
         "//pkg/context",
+        "//pkg/errors/linuxerr",
         "//pkg/fspath",
         "//pkg/sentry/contexttest",
         "//pkg/sentry/fsimpl/testutil",
@@ -127,7 +129,6 @@ go_test(
         "//pkg/sentry/kernel",
         "//pkg/sentry/kernel/auth",
         "//pkg/sentry/vfs",
-        "//pkg/syserror",
         "//pkg/usermem",
     ],
 )
diff --git a/pkg/sentry/fsimpl/proc/task_net.go b/pkg/sentry/fsimpl/proc/task_net.go
index 177cb828f..ab47ea5a7 100644
--- a/pkg/sentry/fsimpl/proc/task_net.go
+++ b/pkg/sentry/fsimpl/proc/task_net.go
@@ -23,6 +23,7 @@ import (
 
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/hostarch"
 	"gvisor.dev/gvisor/pkg/log"
 	"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
@@ -33,7 +34,6 @@ import (
 	"gvisor.dev/gvisor/pkg/sentry/socket/unix"
 	"gvisor.dev/gvisor/pkg/sentry/socket/unix/transport"
 	"gvisor.dev/gvisor/pkg/sentry/vfs"
-	"gvisor.dev/gvisor/pkg/syserror"
 	"gvisor.dev/gvisor/pkg/tcpip/header"
 )
 
@@ -679,7 +679,7 @@ func (d *netSnmpData) Generate(ctx context.Context, buf *bytes.Buffer) error {
 			continue
 		}
 		if err := d.stack.Statistics(stat, line.prefix); err != nil {
-			if err == syserror.EOPNOTSUPP {
+			if linuxerr.Equals(linuxerr.EOPNOTSUPP, err) {
 				log.Infof("Failed to retrieve %s of /proc/net/snmp: %v", line.prefix, err)
 			} else {
 				log.Warningf("Failed to retrieve %s of /proc/net/snmp: %v", line.prefix, err)
diff --git a/pkg/sentry/fsimpl/proc/tasks_test.go b/pkg/sentry/fsimpl/proc/tasks_test.go
index e534fbca8..14f806c3c 100644
--- a/pkg/sentry/fsimpl/proc/tasks_test.go
+++ b/pkg/sentry/fsimpl/proc/tasks_test.go
@@ -23,13 +23,13 @@ import (
 
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/fspath"
 	"gvisor.dev/gvisor/pkg/sentry/fsimpl/testutil"
 	"gvisor.dev/gvisor/pkg/sentry/fsimpl/tmpfs"
 	"gvisor.dev/gvisor/pkg/sentry/kernel"
 	"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
 	"gvisor.dev/gvisor/pkg/sentry/vfs"
-	"gvisor.dev/gvisor/pkg/syserror"
 	"gvisor.dev/gvisor/pkg/usermem"
 )
 
@@ -227,7 +227,7 @@ func TestTasks(t *testing.T) {
 		defer fd.DecRef(s.Ctx)
 		buf := make([]byte, 1)
 		bufIOSeq := usermem.BytesIOSequence(buf)
-		if _, err := fd.Read(s.Ctx, bufIOSeq, vfs.ReadOptions{}); err != syserror.EISDIR {
+		if _, err := fd.Read(s.Ctx, bufIOSeq, vfs.ReadOptions{}); !linuxerr.Equals(linuxerr.EISDIR, err) {
 			t.Errorf("wrong error reading directory: %v", err)
 		}
 	}
@@ -237,7 +237,7 @@ func TestTasks(t *testing.T) {
 		s.Creds,
 		s.PathOpAtRoot("/proc/9999"),
 		&vfs.OpenOptions{},
-	); err != syserror.ENOENT {
+	); !linuxerr.Equals(linuxerr.ENOENT, err) {
 		t.Fatalf("wrong error from vfsfs.OpenAt(/proc/9999): %v", err)
 	}
 }
diff --git a/pkg/sentry/fsimpl/tmpfs/BUILD b/pkg/sentry/fsimpl/tmpfs/BUILD
index e21fddd7f..341b4f904 100644
--- a/pkg/sentry/fsimpl/tmpfs/BUILD
+++ b/pkg/sentry/fsimpl/tmpfs/BUILD
@@ -118,6 +118,7 @@ go_test(
     deps = [
         "//pkg/abi/linux",
         "//pkg/context",
+        "//pkg/errors/linuxerr",
         "//pkg/fspath",
         "//pkg/sentry/contexttest",
         "//pkg/sentry/fs/lock",
diff --git a/pkg/sentry/fsimpl/tmpfs/pipe_test.go b/pkg/sentry/fsimpl/tmpfs/pipe_test.go
index 2f856ce36..418c7994e 100644
--- a/pkg/sentry/fsimpl/tmpfs/pipe_test.go
+++ b/pkg/sentry/fsimpl/tmpfs/pipe_test.go
@@ -20,6 +20,7 @@ import (
 
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/fspath"
 	"gvisor.dev/gvisor/pkg/sentry/contexttest"
 	"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
@@ -114,7 +115,7 @@ func TestNonblockingWriteError(t *testing.T) {
 	}
 	openOpts := vfs.OpenOptions{Flags: linux.O_WRONLY | linux.O_NONBLOCK}
 	_, err := vfsObj.OpenAt(ctx, creds, &pop, &openOpts)
-	if err != syserror.ENXIO {
+	if !linuxerr.Equals(linuxerr.ENXIO, err) {
 		t.Fatalf("expected ENXIO, but got error: %v", err)
 	}
 }
diff --git a/pkg/sentry/fsimpl/verity/BUILD b/pkg/sentry/fsimpl/verity/BUILD
index d473a922d..1d855234c 100644
--- a/pkg/sentry/fsimpl/verity/BUILD
+++ b/pkg/sentry/fsimpl/verity/BUILD
@@ -13,6 +13,7 @@ go_library(
     deps = [
         "//pkg/abi/linux",
         "//pkg/context",
+        "//pkg/errors/linuxerr",
         "//pkg/fspath",
         "//pkg/hostarch",
         "//pkg/marshal/primitive",
@@ -41,6 +42,7 @@ go_test(
     deps = [
         "//pkg/abi/linux",
         "//pkg/context",
+        "//pkg/errors/linuxerr",
         "//pkg/fspath",
         "//pkg/sentry/arch",
         "//pkg/sentry/fsimpl/testutil",
@@ -48,7 +50,6 @@ go_test(
         "//pkg/sentry/kernel",
         "//pkg/sentry/kernel/auth",
         "//pkg/sentry/vfs",
-        "//pkg/syserror",
         "//pkg/usermem",
     ],
 )
diff --git a/pkg/sentry/fsimpl/verity/filesystem.go b/pkg/sentry/fsimpl/verity/filesystem.go
index 3582d14c9..e84452421 100644
--- a/pkg/sentry/fsimpl/verity/filesystem.go
+++ b/pkg/sentry/fsimpl/verity/filesystem.go
@@ -25,6 +25,7 @@ import (
 
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/fspath"
 	"gvisor.dev/gvisor/pkg/merkletree"
 	"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
@@ -195,7 +196,7 @@ func (fs *filesystem) verifyChildLocked(ctx context.Context, parent *dentry, chi
 	// The Merkle tree file for the child should have been created and
 	// contains the expected xattrs. If the file or the xattr does not
 	// exist, it indicates unexpected modifications to the file system.
-	if err == syserror.ENOENT || err == syserror.ENODATA {
+	if linuxerr.Equals(linuxerr.ENOENT, err) || linuxerr.Equals(linuxerr.ENODATA, err) {
 		return nil, fs.alertIntegrityViolation(fmt.Sprintf("Failed to get xattr %s for %s: %v", merkleOffsetInParentXattr, childPath, err))
 	}
 	if err != nil {
@@ -218,7 +219,7 @@ func (fs *filesystem) verifyChildLocked(ctx context.Context, parent *dentry, chi
 
 	// The parent Merkle tree file should have been created. If it's
 	// missing, it indicates an unexpected modification to the file system.
-	if err == syserror.ENOENT {
+	if linuxerr.Equals(linuxerr.ENOENT, err) {
 		return nil, fs.alertIntegrityViolation(fmt.Sprintf("Failed to open parent Merkle file for %s: %v", childPath, err))
 	}
 	if err != nil {
@@ -238,7 +239,7 @@ func (fs *filesystem) verifyChildLocked(ctx context.Context, parent *dentry, chi
 	// The Merkle tree file for the child should have been created and
 	// contains the expected xattrs. If the file or the xattr does not
 	// exist, it indicates unexpected modifications to the file system.
-	if err == syserror.ENOENT || err == syserror.ENODATA {
+	if linuxerr.Equals(linuxerr.ENOENT, err) || linuxerr.Equals(linuxerr.ENODATA, err) {
 		return nil, fs.alertIntegrityViolation(fmt.Sprintf("Failed to get xattr %s for %s: %v", merkleSizeXattr, childPath, err))
 	}
 	if err != nil {
@@ -261,7 +262,7 @@ func (fs *filesystem) verifyChildLocked(ctx context.Context, parent *dentry, chi
 		Root:  parent.lowerVD,
 		Start: parent.lowerVD,
 	}, &vfs.StatOptions{})
-	if err == syserror.ENOENT {
+	if linuxerr.Equals(linuxerr.ENOENT, err) {
 		return nil, fs.alertIntegrityViolation(fmt.Sprintf("Failed to get parent stat for %s: %v", childPath, err))
 	}
 	if err != nil {
@@ -327,7 +328,7 @@ func (fs *filesystem) verifyStatAndChildrenLocked(ctx context.Context, d *dentry
 	}, &vfs.OpenOptions{
 		Flags: linux.O_RDONLY,
 	})
-	if err == syserror.ENOENT {
+	if linuxerr.Equals(linuxerr.ENOENT, err) {
 		return fs.alertIntegrityViolation(fmt.Sprintf("Failed to open merkle file for %s: %v", childPath, err))
 	}
 	if err != nil {
@@ -341,7 +342,7 @@ func (fs *filesystem) verifyStatAndChildrenLocked(ctx context.Context, d *dentry
 		Size: sizeOfStringInt32,
 	})
 
-	if err == syserror.ENODATA {
+	if linuxerr.Equals(linuxerr.ENODATA, err) {
 		return fs.alertIntegrityViolation(fmt.Sprintf("Failed to get xattr %s for merkle file of %s: %v", merkleSizeXattr, childPath, err))
 	}
 	if err != nil {
@@ -359,7 +360,7 @@ func (fs *filesystem) verifyStatAndChildrenLocked(ctx context.Context, d *dentry
 			Size: sizeOfStringInt32,
 		})
 
-		if err == syserror.ENODATA {
+		if linuxerr.Equals(linuxerr.ENODATA, err) {
 			return fs.alertIntegrityViolation(fmt.Sprintf("Failed to get xattr %s for merkle file of %s: %v", childrenOffsetXattr, childPath, err))
 		}
 		if err != nil {
@@ -375,7 +376,7 @@ func (fs *filesystem) verifyStatAndChildrenLocked(ctx context.Context, d *dentry
 			Size: sizeOfStringInt32,
 		})
 
-		if err == syserror.ENODATA {
+		if linuxerr.Equals(linuxerr.ENODATA, err) {
 			return fs.alertIntegrityViolation(fmt.Sprintf("Failed to get xattr %s for merkle file of %s: %v", childrenSizeXattr, childPath, err))
 		}
 		if err != nil {
@@ -465,7 +466,7 @@ func (fs *filesystem) getChildLocked(ctx context.Context, parent *dentry, name s
 			}
 
 			childVD, err := parent.getLowerAt(ctx, vfsObj, name)
-			if err == syserror.ENOENT {
+			if linuxerr.Equals(linuxerr.ENOENT, err) {
 				// The file was previously accessed. If the
 				// file does not exist now, it indicates an
 				// unexpected modification to the file system.
@@ -480,7 +481,7 @@ func (fs *filesystem) getChildLocked(ctx context.Context, parent *dentry, name s
 			// The Merkle tree file was previous accessed. If it
 			// does not exist now, it indicates an unexpected
 			// modification to the file system.
-			if err == syserror.ENOENT {
+			if linuxerr.Equals(linuxerr.ENOENT, err) {
 				return nil, fs.alertIntegrityViolation(fmt.Sprintf("Expected Merkle file for target %s but none found", path))
 			}
 			if err != nil {
@@ -551,7 +552,7 @@ func (fs *filesystem) lookupAndVerifyLocked(ctx context.Context, parent *dentry,
 	}
 
 	childVD, err := parent.getLowerAt(ctx, vfsObj, name)
-	if parent.verityEnabled() && err == syserror.ENOENT {
+	if parent.verityEnabled() && linuxerr.Equals(linuxerr.ENOENT, err) {
 		return nil, fs.alertIntegrityViolation(fmt.Sprintf("file %s expected but not found", parentPath+"/"+name))
 	}
 	if err != nil {
@@ -564,7 +565,7 @@ func (fs *filesystem) lookupAndVerifyLocked(ctx context.Context, parent *dentry,
 
 	childMerkleVD, err := parent.getLowerAt(ctx, vfsObj, merklePrefix+name)
 	if err != nil {
-		if err == syserror.ENOENT {
+		if linuxerr.Equals(linuxerr.ENOENT, err) {
 			if parent.verityEnabled() {
 				return nil, fs.alertIntegrityViolation(fmt.Sprintf("Merkle file for %s expected but not found", parentPath+"/"+name))
 			}
@@ -854,7 +855,7 @@ func (d *dentry) openLocked(ctx context.Context, rp *vfs.ResolvingPath, opts *vf
 	// The file should exist, as we succeeded in finding its dentry. If it's
 	// missing, it indicates an unexpected modification to the file system.
 	if err != nil {
-		if err == syserror.ENOENT {
+		if linuxerr.Equals(linuxerr.ENOENT, err) {
 			return nil, d.fs.alertIntegrityViolation(fmt.Sprintf("File %s expected but not found", path))
 		}
 		return nil, err
@@ -877,7 +878,7 @@ func (d *dentry) openLocked(ctx context.Context, rp *vfs.ResolvingPath, opts *vf
 	// dentry. If it's missing, it indicates an unexpected modification to
 	// the file system.
 	if err != nil {
-		if err == syserror.ENOENT {
+		if linuxerr.Equals(linuxerr.ENOENT, err) {
 			return nil, d.fs.alertIntegrityViolation(fmt.Sprintf("Merkle file for %s expected but not found", path))
 		}
 		return nil, err
@@ -902,7 +903,7 @@ func (d *dentry) openLocked(ctx context.Context, rp *vfs.ResolvingPath, opts *vf
 			Flags: linux.O_WRONLY | linux.O_APPEND,
 		})
 		if err != nil {
-			if err == syserror.ENOENT {
+			if linuxerr.Equals(linuxerr.ENOENT, err) {
 				return nil, d.fs.alertIntegrityViolation(fmt.Sprintf("Merkle file for %s expected but not found", path))
 			}
 			return nil, err
@@ -919,7 +920,7 @@ func (d *dentry) openLocked(ctx context.Context, rp *vfs.ResolvingPath, opts *vf
 				Flags: linux.O_WRONLY | linux.O_APPEND,
 			})
 			if err != nil {
-				if err == syserror.ENOENT {
+				if linuxerr.Equals(linuxerr.ENOENT, err) {
 					parentPath, _ := d.fs.vfsfs.VirtualFilesystem().PathnameWithDeleted(ctx, d.fs.rootDentry.lowerVD, d.parent.lowerVD)
 					return nil, d.fs.alertIntegrityViolation(fmt.Sprintf("Merkle file for %s expected but not found", parentPath))
 				}
diff --git a/pkg/sentry/fsimpl/verity/verity.go b/pkg/sentry/fsimpl/verity/verity.go
index 969003613..c5f59d851 100644
--- a/pkg/sentry/fsimpl/verity/verity.go
+++ b/pkg/sentry/fsimpl/verity/verity.go
@@ -45,6 +45,7 @@ import (
 
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/fspath"
 	"gvisor.dev/gvisor/pkg/hostarch"
 	"gvisor.dev/gvisor/pkg/marshal/primitive"
@@ -358,7 +359,7 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
 
 	// If runtime enable is allowed, the root merkle tree may be absent. We
 	// should create the tree file.
-	if err == syserror.ENOENT && fs.allowRuntimeEnable {
+	if linuxerr.Equals(linuxerr.ENOENT, err) && fs.allowRuntimeEnable {
 		lowerMerkleFD, err := vfsObj.OpenAt(ctx, fs.creds, &vfs.PathOperation{
 			Root:  lowerVD,
 			Start: lowerVD,
@@ -451,7 +452,7 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
 			Name: childrenOffsetXattr,
 			Size: sizeOfStringInt32,
 		})
-		if err == syserror.ENOENT || err == syserror.ENODATA {
+		if linuxerr.Equals(linuxerr.ENOENT, err) || linuxerr.Equals(linuxerr.ENODATA, err) {
 			return nil, nil, fs.alertIntegrityViolation(fmt.Sprintf("Failed to get xattr %s: %v", childrenOffsetXattr, err))
 		}
 		if err != nil {
@@ -470,7 +471,7 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
 			Name: childrenSizeXattr,
 			Size: sizeOfStringInt32,
 		})
-		if err == syserror.ENOENT || err == syserror.ENODATA {
+		if linuxerr.Equals(linuxerr.ENOENT, err) || linuxerr.Equals(linuxerr.ENODATA, err) {
 			return nil, nil, fs.alertIntegrityViolation(fmt.Sprintf("Failed to get xattr %s: %v", childrenSizeXattr, err))
 		}
 		if err != nil {
@@ -487,7 +488,7 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
 		}, &vfs.OpenOptions{
 			Flags: linux.O_RDONLY,
 		})
-		if err == syserror.ENOENT {
+		if linuxerr.Equals(linuxerr.ENOENT, err) {
 			return nil, nil, fs.alertIntegrityViolation(fmt.Sprintf("Failed to open root Merkle file: %v", err))
 		}
 		if err != nil {
@@ -1227,7 +1228,7 @@ func (fd *fileDescription) PRead(ctx context.Context, dst usermem.IOSequence, of
 	// The Merkle tree file for the child should have been created and
 	// contains the expected xattrs. If the xattr does not exist, it
 	// indicates unexpected modifications to the file system.
-	if err == syserror.ENODATA {
+	if linuxerr.Equals(linuxerr.ENODATA, err) {
 		return 0, fd.d.fs.alertIntegrityViolation(fmt.Sprintf("Failed to get xattr %s: %v", merkleSizeXattr, err))
 	}
 	if err != nil {
@@ -1349,7 +1350,7 @@ func (fd *fileDescription) Translate(ctx context.Context, required, optional mem
 	// The Merkle tree file for the child should have been created and
 	// contains the expected xattrs. If the xattr does not exist, it
 	// indicates unexpected modifications to the file system.
-	if err == syserror.ENODATA {
+	if linuxerr.Equals(linuxerr.ENODATA, err) {
 		return nil, fd.d.fs.alertIntegrityViolation(fmt.Sprintf("Failed to get xattr %s: %v", merkleSizeXattr, err))
 	}
 	if err != nil {
diff --git a/pkg/sentry/fsimpl/verity/verity_test.go b/pkg/sentry/fsimpl/verity/verity_test.go
index 5c78a0019..65465b814 100644
--- a/pkg/sentry/fsimpl/verity/verity_test.go
+++ b/pkg/sentry/fsimpl/verity/verity_test.go
@@ -24,6 +24,7 @@ import (
 
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/fspath"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 	"gvisor.dev/gvisor/pkg/sentry/fsimpl/testutil"
@@ -31,7 +32,6 @@ import (
 	"gvisor.dev/gvisor/pkg/sentry/kernel"
 	"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
 	"gvisor.dev/gvisor/pkg/sentry/vfs"
-	"gvisor.dev/gvisor/pkg/syserror"
 	"gvisor.dev/gvisor/pkg/usermem"
 )
 
@@ -476,7 +476,7 @@ func TestOpenNonexistentFile(t *testing.T) {
 
 	// Ensure open an unexpected file in the parent directory fails with
 	// ENOENT rather than verification failure.
-	if _, err = openVerityAt(ctx, vfsObj, root, filename+"abc", linux.O_RDONLY, linux.ModeRegular); err != syserror.ENOENT {
+	if _, err = openVerityAt(ctx, vfsObj, root, filename+"abc", linux.O_RDONLY, linux.ModeRegular); !linuxerr.Equals(linuxerr.ENOENT, err) {
 		t.Errorf("OpenAt unexpected error: %v", err)
 	}
 }
@@ -767,7 +767,7 @@ func TestOpenDeletedFileFails(t *testing.T) {
 			}
 
 			// Ensure reopening the verity enabled file fails.
-			if _, err = openVerityAt(ctx, vfsObj, root, filename, linux.O_RDONLY, linux.ModeRegular); err != syserror.EIO {
+			if _, err = openVerityAt(ctx, vfsObj, root, filename, linux.O_RDONLY, linux.ModeRegular); !linuxerr.Equals(linuxerr.EIO, err) {
 				t.Errorf("got OpenAt error: %v, expected EIO", err)
 			}
 		})
@@ -829,7 +829,7 @@ func TestOpenRenamedFileFails(t *testing.T) {
 			}
 
 			// Ensure reopening the verity enabled file fails.
-			if _, err = openVerityAt(ctx, vfsObj, root, filename, linux.O_RDONLY, linux.ModeRegular); err != syserror.EIO {
+			if _, err = openVerityAt(ctx, vfsObj, root, filename, linux.O_RDONLY, linux.ModeRegular); !linuxerr.Equals(linuxerr.EIO, err) {
 				t.Errorf("got OpenAt error: %v, expected EIO", err)
 			}
 		})
@@ -1063,14 +1063,14 @@ func TestDeletedSymlinkFileReadFails(t *testing.T) {
 				Root:  root,
 				Start: root,
 				Path:  fspath.Parse(symlink),
-			}); err != syserror.EIO {
+			}); !linuxerr.Equals(linuxerr.EIO, err) {
 				t.Fatalf("ReadlinkAt succeeded with modified symlink: %v", err)
 			}
 
 			if tc.testWalk {
 				fileInSymlinkDirectory := symlink + "/verity-test-file"
 				// Ensure opening the verity enabled file in the symlink directory fails.
-				if _, err := openVerityAt(ctx, vfsObj, root, fileInSymlinkDirectory, linux.O_RDONLY, linux.ModeRegular); err != syserror.EIO {
+				if _, err := openVerityAt(ctx, vfsObj, root, fileInSymlinkDirectory, linux.O_RDONLY, linux.ModeRegular); !linuxerr.Equals(linuxerr.EIO, err) {
 					t.Errorf("Open succeeded with modified symlink: %v", err)
 				}
 			}
@@ -1195,14 +1195,14 @@ func TestModifiedSymlinkFileReadFails(t *testing.T) {
 				Root:  root,
 				Start: root,
 				Path:  fspath.Parse(symlink),
-			}); err != syserror.EIO {
+			}); !linuxerr.Equals(linuxerr.EIO, err) {
 				t.Fatalf("ReadlinkAt succeeded with modified symlink: %v", err)
 			}
 
 			if tc.testWalk {
 				fileInSymlinkDirectory := symlink + "/verity-test-file"
 				// Ensure opening the verity enabled file in the symlink directory fails.
-				if _, err := openVerityAt(ctx, vfsObj, root, fileInSymlinkDirectory, linux.O_RDONLY, linux.ModeRegular); err != syserror.EIO {
+				if _, err := openVerityAt(ctx, vfsObj, root, fileInSymlinkDirectory, linux.O_RDONLY, linux.ModeRegular); !linuxerr.Equals(linuxerr.EIO, err) {
 					t.Errorf("Open succeeded with modified symlink: %v", err)
 				}
 			}