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-rw-r--r--internal/syscallcompat/sys_common_test.go54
1 files changed, 54 insertions, 0 deletions
diff --git a/internal/syscallcompat/sys_common_test.go b/internal/syscallcompat/sys_common_test.go
index e568a36..455774f 100644
--- a/internal/syscallcompat/sys_common_test.go
+++ b/internal/syscallcompat/sys_common_test.go
@@ -2,6 +2,7 @@ package syscallcompat
import (
"bytes"
+ "os"
"syscall"
"testing"
)
@@ -32,3 +33,56 @@ func TestReadlinkat(t *testing.T) {
}
}
}
+
+func TestFchmodat(t *testing.T) {
+ regular := "TestFchmodat_Regular"
+ f, err := os.OpenFile(tmpDir+"/"+regular, os.O_CREATE|os.O_WRONLY, 0000)
+ if err != nil {
+ t.Fatal(err)
+ }
+ f.Close()
+ symlink := "TestFchmodat_Symlink"
+ err = syscall.Symlink(regular, tmpDir+"/"+symlink)
+ if err != nil {
+ t.Fatal(err)
+ }
+ dirfd, err := syscall.Open(tmpDir, syscall.O_RDONLY, 0)
+ if err != nil {
+ t.Fatal(err)
+ }
+ defer syscall.Close(dirfd)
+
+ // Check that chmod on a regular file works ok
+ err = Fchmodat(dirfd, regular, 0111, 0)
+ if err != nil {
+ t.Fatal(err)
+ }
+ var st syscall.Stat_t
+ syscall.Lstat(tmpDir+"/"+regular, &st)
+ st.Mode &= 0777
+ if st.Mode != 0111 {
+ t.Errorf("wrong mode: %#0o", st.Mode)
+ }
+ err = Fchmodat(dirfd, regular, 0000, 0)
+ if err != nil {
+ t.Error(err)
+ }
+ syscall.Lstat(tmpDir+"/"+regular, &st)
+ st.Mode &= 0777
+ if st.Mode != 0000 {
+ t.Errorf("wrong mode: %#0o", st.Mode)
+ }
+
+ // Check what happens on a symlink
+ err = Fchmodat(dirfd, symlink, 0333, 0)
+ if err == nil {
+ syscall.Lstat(tmpDir+"/"+symlink, &st)
+ st.Mode &= 0777
+ t.Errorf("chmod on symlink should have failed, but did not. New mode=%#0o", st.Mode)
+ }
+ syscall.Lstat(tmpDir+"/"+regular, &st)
+ st.Mode &= 0777
+ if st.Mode != 0000 {
+ t.Errorf("chmod on symlink affected symlink target: New mode=%#0o", st.Mode)
+ }
+}