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-rw-r--r--internal/syscallcompat/sys_linux.go22
1 files changed, 22 insertions, 0 deletions
diff --git a/internal/syscallcompat/sys_linux.go b/internal/syscallcompat/sys_linux.go
index cf747b1..6f2a70d 100644
--- a/internal/syscallcompat/sys_linux.go
+++ b/internal/syscallcompat/sys_linux.go
@@ -197,6 +197,28 @@ func Symlinkat(oldpath string, newdirfd int, newpath string) (err error) {
return unix.Symlinkat(oldpath, newdirfd, newpath)
}
+// SymlinkatUser runs the Symlinkat syscall in the context of a different user.
+func SymlinkatUser(oldpath string, newdirfd int, newpath string, context *fuse.Context) (err error) {
+ if context != nil {
+ runtime.LockOSThread()
+ defer runtime.UnlockOSThread()
+
+ err = syscall.Setregid(-1, int(context.Owner.Gid))
+ if err != nil {
+ return err
+ }
+ defer syscall.Setregid(-1, 0)
+
+ err = syscall.Setreuid(-1, int(context.Owner.Uid))
+ if err != nil {
+ return err
+ }
+ defer syscall.Setreuid(-1, 0)
+ }
+
+ return Symlinkat(oldpath, newdirfd, newpath)
+}
+
// Mkdirat syscall.
func Mkdirat(dirfd int, path string, mode uint32) (err error) {
return syscall.Mkdirat(dirfd, path, mode)