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-rw-r--r--internal/syscallcompat/sys_linux.go23
1 files changed, 23 insertions, 0 deletions
diff --git a/internal/syscallcompat/sys_linux.go b/internal/syscallcompat/sys_linux.go
index 5c180ec..595aa1d 100644
--- a/internal/syscallcompat/sys_linux.go
+++ b/internal/syscallcompat/sys_linux.go
@@ -3,6 +3,7 @@ package syscallcompat
import (
"fmt"
+ "runtime"
"sync"
"syscall"
@@ -75,6 +76,28 @@ func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
return syscall.Openat(dirfd, path, flags, mode)
}
+// OpenatUser runs the Openat syscall in the context of a different user.
+func OpenatUser(dirfd int, path string, flags int, mode uint32, context *fuse.Context) (fd int, err error) {
+ if context != nil {
+ runtime.LockOSThread()
+ defer runtime.UnlockOSThread()
+
+ err = syscall.Setregid(-1, int(context.Owner.Gid))
+ if err != nil {
+ return -1, err
+ }
+ defer syscall.Setregid(-1, 0)
+
+ err = syscall.Setreuid(-1, int(context.Owner.Uid))
+ if err != nil {
+ return -1, err
+ }
+ defer syscall.Setreuid(-1, 0)
+ }
+
+ return Openat(dirfd, path, flags, mode)
+}
+
// Renameat wraps the Renameat syscall.
func Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) {
return syscall.Renameat(olddirfd, oldpath, newdirfd, newpath)