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Diffstat (limited to 'pkg/sentry/syscalls/linux/sys_file.go')
-rw-r--r--pkg/sentry/syscalls/linux/sys_file.go57
1 files changed, 28 insertions, 29 deletions
diff --git a/pkg/sentry/syscalls/linux/sys_file.go b/pkg/sentry/syscalls/linux/sys_file.go
index 31c26fd5c..d9ed02c99 100644
--- a/pkg/sentry/syscalls/linux/sys_file.go
+++ b/pkg/sentry/syscalls/linux/sys_file.go
@@ -35,13 +35,13 @@ import (
)
// fileOpAt performs an operation on the second last component in the path.
-func fileOpAt(t *kernel.Task, dirFD kdefs.FD, path string, fn func(root *fs.Dirent, d *fs.Dirent, name string) error) error {
+func fileOpAt(t *kernel.Task, dirFD kdefs.FD, path string, fn func(root *fs.Dirent, d *fs.Dirent, name string, remainingTraversals uint) error) error {
// Extract the last component.
dir, name := fs.SplitLast(path)
if dir == "/" {
// Common case: we are accessing a file in the root.
root := t.FSContext().RootDirectory()
- err := fn(root, root, name)
+ err := fn(root, root, name, linux.MaxSymlinkTraversals)
root.DecRef()
return err
} else if dir == "." && dirFD == linux.AT_FDCWD {
@@ -49,19 +49,19 @@ func fileOpAt(t *kernel.Task, dirFD kdefs.FD, path string, fn func(root *fs.Dire
// working directory; skip the look-up.
wd := t.FSContext().WorkingDirectory()
root := t.FSContext().RootDirectory()
- err := fn(root, wd, name)
+ err := fn(root, wd, name, linux.MaxSymlinkTraversals)
wd.DecRef()
root.DecRef()
return err
}
- return fileOpOn(t, dirFD, dir, true /* resolve */, func(root *fs.Dirent, d *fs.Dirent) error {
- return fn(root, d, name)
+ return fileOpOn(t, dirFD, dir, true /* resolve */, func(root *fs.Dirent, d *fs.Dirent, remainingTraversals uint) error {
+ return fn(root, d, name, remainingTraversals)
})
}
// fileOpOn performs an operation on the last entry of the path.
-func fileOpOn(t *kernel.Task, dirFD kdefs.FD, path string, resolve bool, fn func(root *fs.Dirent, d *fs.Dirent) error) error {
+func fileOpOn(t *kernel.Task, dirFD kdefs.FD, path string, resolve bool, fn func(root *fs.Dirent, d *fs.Dirent, remainingTraversals uint) error) error {
var (
d *fs.Dirent // The file.
wd *fs.Dirent // The working directory (if required.)
@@ -110,7 +110,7 @@ func fileOpOn(t *kernel.Task, dirFD kdefs.FD, path string, resolve bool, fn func
return err
}
- err = fn(root, d)
+ err = fn(root, d, remainingTraversals)
d.DecRef()
return err
}
@@ -139,7 +139,7 @@ func openAt(t *kernel.Task, dirFD kdefs.FD, addr usermem.Addr, flags uint) (fd u
}
resolve := flags&linux.O_NOFOLLOW == 0
- err = fileOpOn(t, dirFD, path, resolve, func(root *fs.Dirent, d *fs.Dirent) error {
+ err = fileOpOn(t, dirFD, path, resolve, func(root *fs.Dirent, d *fs.Dirent, _ uint) error {
// First check a few things about the filesystem before trying to get the file
// reference.
//
@@ -211,7 +211,7 @@ func mknodAt(t *kernel.Task, dirFD kdefs.FD, addr usermem.Addr, mode linux.FileM
return syserror.ENOENT
}
- return fileOpAt(t, dirFD, path, func(root *fs.Dirent, d *fs.Dirent, name string) error {
+ return fileOpAt(t, dirFD, path, func(root *fs.Dirent, d *fs.Dirent, name string, _ uint) error {
if !fs.IsDir(d.Inode.StableAttr) {
return syserror.ENOTDIR
}
@@ -304,7 +304,7 @@ func createAt(t *kernel.Task, dirFD kdefs.FD, addr usermem.Addr, flags uint, mod
return 0, syserror.ENOENT
}
- err = fileOpAt(t, dirFD, path, func(root *fs.Dirent, d *fs.Dirent, name string) error {
+ err = fileOpAt(t, dirFD, path, func(root *fs.Dirent, d *fs.Dirent, name string, remainingTraversals uint) error {
if !fs.IsDir(d.Inode.StableAttr) {
return syserror.ENOTDIR
}
@@ -314,7 +314,6 @@ func createAt(t *kernel.Task, dirFD kdefs.FD, addr usermem.Addr, flags uint, mod
fileFlags.LargeFile = true
// Does this file exist already?
- remainingTraversals := uint(linux.MaxSymlinkTraversals)
targetDirent, err := t.MountNamespace().FindInode(t, root, d, name, &remainingTraversals)
var newFile *fs.File
switch err {
@@ -458,7 +457,7 @@ func accessAt(t *kernel.Task, dirFD kdefs.FD, addr usermem.Addr, resolve bool, m
return syserror.EINVAL
}
- return fileOpOn(t, dirFD, path, resolve, func(root *fs.Dirent, d *fs.Dirent) error {
+ return fileOpOn(t, dirFD, path, resolve, func(root *fs.Dirent, d *fs.Dirent, _ uint) error {
// access(2) and faccessat(2) check permissions using real
// UID/GID, not effective UID/GID.
//
@@ -626,7 +625,7 @@ func Chroot(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Syscal
return 0, nil, err
}
- return 0, nil, fileOpOn(t, linux.AT_FDCWD, path, true /* resolve */, func(root *fs.Dirent, d *fs.Dirent) error {
+ return 0, nil, fileOpOn(t, linux.AT_FDCWD, path, true /* resolve */, func(root *fs.Dirent, d *fs.Dirent, _ uint) error {
// Is it a directory?
if !fs.IsDir(d.Inode.StableAttr) {
return syserror.ENOTDIR
@@ -651,7 +650,7 @@ func Chdir(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Syscall
return 0, nil, err
}
- return 0, nil, fileOpOn(t, linux.AT_FDCWD, path, true /* resolve */, func(root *fs.Dirent, d *fs.Dirent) error {
+ return 0, nil, fileOpOn(t, linux.AT_FDCWD, path, true /* resolve */, func(root *fs.Dirent, d *fs.Dirent, _ uint) error {
// Is it a directory?
if !fs.IsDir(d.Inode.StableAttr) {
return syserror.ENOTDIR
@@ -1017,7 +1016,7 @@ func mkdirAt(t *kernel.Task, dirFD kdefs.FD, addr usermem.Addr, mode linux.FileM
return err
}
- return fileOpAt(t, dirFD, path, func(root *fs.Dirent, d *fs.Dirent, name string) error {
+ return fileOpAt(t, dirFD, path, func(root *fs.Dirent, d *fs.Dirent, name string, _ uint) error {
if !fs.IsDir(d.Inode.StableAttr) {
return syserror.ENOTDIR
}
@@ -1074,7 +1073,7 @@ func rmdirAt(t *kernel.Task, dirFD kdefs.FD, addr usermem.Addr) error {
return syserror.EBUSY
}
- return fileOpAt(t, dirFD, path, func(root *fs.Dirent, d *fs.Dirent, name string) error {
+ return fileOpAt(t, dirFD, path, func(root *fs.Dirent, d *fs.Dirent, name string, _ uint) error {
if !fs.IsDir(d.Inode.StableAttr) {
return syserror.ENOTDIR
}
@@ -1122,7 +1121,7 @@ func symlinkAt(t *kernel.Task, dirFD kdefs.FD, newAddr usermem.Addr, oldAddr use
return syserror.ENOENT
}
- return fileOpAt(t, dirFD, newPath, func(root *fs.Dirent, d *fs.Dirent, name string) error {
+ return fileOpAt(t, dirFD, newPath, func(root *fs.Dirent, d *fs.Dirent, name string, _ uint) error {
if !fs.IsDir(d.Inode.StableAttr) {
return syserror.ENOTDIR
}
@@ -1212,7 +1211,7 @@ func linkAt(t *kernel.Task, oldDirFD kdefs.FD, oldAddr usermem.Addr, newDirFD kd
}
// Resolve the target directory.
- return fileOpAt(t, newDirFD, newPath, func(root *fs.Dirent, newParent *fs.Dirent, newName string) error {
+ return fileOpAt(t, newDirFD, newPath, func(root *fs.Dirent, newParent *fs.Dirent, newName string, _ uint) error {
if !fs.IsDir(newParent.Inode.StableAttr) {
return syserror.ENOTDIR
}
@@ -1227,13 +1226,13 @@ func linkAt(t *kernel.Task, oldDirFD kdefs.FD, oldAddr usermem.Addr, newDirFD kd
// Resolve oldDirFD and oldAddr to a dirent. The "resolve" argument
// only applies to this name.
- return fileOpOn(t, oldDirFD, oldPath, resolve, func(root *fs.Dirent, target *fs.Dirent) error {
+ return fileOpOn(t, oldDirFD, oldPath, resolve, func(root *fs.Dirent, target *fs.Dirent, _ uint) error {
if err := mayLinkAt(t, target.Inode); err != nil {
return err
}
// Next resolve newDirFD and newAddr to the parent dirent and name.
- return fileOpAt(t, newDirFD, newPath, func(root *fs.Dirent, newParent *fs.Dirent, newName string) error {
+ return fileOpAt(t, newDirFD, newPath, func(root *fs.Dirent, newParent *fs.Dirent, newName string, _ uint) error {
if !fs.IsDir(newParent.Inode.StableAttr) {
return syserror.ENOTDIR
}
@@ -1300,7 +1299,7 @@ func readlinkAt(t *kernel.Task, dirFD kdefs.FD, addr usermem.Addr, bufAddr userm
return 0, syserror.ENOENT
}
- err = fileOpOn(t, dirFD, path, false /* resolve */, func(root *fs.Dirent, d *fs.Dirent) error {
+ err = fileOpOn(t, dirFD, path, false /* resolve */, func(root *fs.Dirent, d *fs.Dirent, _ uint) error {
// Check for Read permission.
if err := d.Inode.CheckPermission(t, fs.PermMask{Read: true}); err != nil {
return err
@@ -1359,7 +1358,7 @@ func unlinkAt(t *kernel.Task, dirFD kdefs.FD, addr usermem.Addr) error {
return syserror.ENOENT
}
- return fileOpAt(t, dirFD, path, func(root *fs.Dirent, d *fs.Dirent, name string) error {
+ return fileOpAt(t, dirFD, path, func(root *fs.Dirent, d *fs.Dirent, name string, _ uint) error {
if !fs.IsDir(d.Inode.StableAttr) {
return syserror.ENOTDIR
}
@@ -1414,7 +1413,7 @@ func Truncate(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Sysc
return 0, nil, syserror.EFBIG
}
- return 0, nil, fileOpOn(t, linux.AT_FDCWD, path, true /* resolve */, func(root *fs.Dirent, d *fs.Dirent) error {
+ return 0, nil, fileOpOn(t, linux.AT_FDCWD, path, true /* resolve */, func(root *fs.Dirent, d *fs.Dirent, _ uint) error {
if fs.IsDir(d.Inode.StableAttr) {
return syserror.EISDIR
}
@@ -1576,7 +1575,7 @@ func chownAt(t *kernel.Task, fd kdefs.FD, addr usermem.Addr, resolve, allowEmpty
return chown(t, file.Dirent, uid, gid)
}
- return fileOpOn(t, fd, path, resolve, func(root *fs.Dirent, d *fs.Dirent) error {
+ return fileOpOn(t, fd, path, resolve, func(root *fs.Dirent, d *fs.Dirent, _ uint) error {
return chown(t, d, uid, gid)
})
}
@@ -1652,7 +1651,7 @@ func chmodAt(t *kernel.Task, fd kdefs.FD, addr usermem.Addr, mode linux.FileMode
return err
}
- return fileOpOn(t, fd, path, true /* resolve */, func(root *fs.Dirent, d *fs.Dirent) error {
+ return fileOpOn(t, fd, path, true /* resolve */, func(root *fs.Dirent, d *fs.Dirent, _ uint) error {
return chmod(t, d, mode)
})
}
@@ -1698,7 +1697,7 @@ func defaultSetToSystemTimeSpec() fs.TimeSpec {
}
func utimes(t *kernel.Task, dirFD kdefs.FD, addr usermem.Addr, ts fs.TimeSpec, resolve bool) error {
- setTimestamp := func(root *fs.Dirent, d *fs.Dirent) error {
+ setTimestamp := func(root *fs.Dirent, d *fs.Dirent, _ uint) error {
// Does the task own the file?
if !d.Inode.CheckOwnership(t) {
// Trying to set a specific time? Must be owner.
@@ -1739,7 +1738,7 @@ func utimes(t *kernel.Task, dirFD kdefs.FD, addr usermem.Addr, ts fs.TimeSpec, r
root := t.FSContext().RootDirectory()
defer root.DecRef()
- return setTimestamp(root, f.Dirent)
+ return setTimestamp(root, f.Dirent, linux.MaxSymlinkTraversals)
}
path, _, err := copyInPath(t, addr, false /* allowEmpty */)
@@ -1867,7 +1866,7 @@ func renameAt(t *kernel.Task, oldDirFD kdefs.FD, oldAddr usermem.Addr, newDirFD
return err
}
- return fileOpAt(t, oldDirFD, oldPath, func(root *fs.Dirent, oldParent *fs.Dirent, oldName string) error {
+ return fileOpAt(t, oldDirFD, oldPath, func(root *fs.Dirent, oldParent *fs.Dirent, oldName string, _ uint) error {
if !fs.IsDir(oldParent.Inode.StableAttr) {
return syserror.ENOTDIR
}
@@ -1879,7 +1878,7 @@ func renameAt(t *kernel.Task, oldDirFD kdefs.FD, oldAddr usermem.Addr, newDirFD
return syserror.EBUSY
}
- return fileOpAt(t, newDirFD, newPath, func(root *fs.Dirent, newParent *fs.Dirent, newName string) error {
+ return fileOpAt(t, newDirFD, newPath, func(root *fs.Dirent, newParent *fs.Dirent, newName string, _ uint) error {
if !fs.IsDir(newParent.Inode.StableAttr) {
return syserror.ENOTDIR
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 00:31:03 +0000