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-rw-r--r--llvm/test/tools/llvm-objcopy/ELF/mirror-permissions-unix.test6
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/test/tools/llvm-objcopy/ELF/mirror-permissions-unix.test b/llvm/test/tools/llvm-objcopy/ELF/mirror-permissions-unix.test
index 0c1f6b985a7..ce6e79b1f2b 100644
--- a/llvm/test/tools/llvm-objcopy/ELF/mirror-permissions-unix.test
+++ b/llvm/test/tools/llvm-objcopy/ELF/mirror-permissions-unix.test
@@ -36,6 +36,12 @@
# RUN: ls -l %t1 | cut -f 1 -d ' ' > %t1.perms
# RUN: cmp %t1.perms %t.0640
+## Don't set the permission of a character special file, otherwise there will
+## be an EPERM error (or worse: root may change the permission).
+# RUN: ls -l /dev/null | cut -f 1 -d ' ' > %tnull.perms
+# RUN: llvm-objcopy %t /dev/null
+# RUN: ls -l /dev/null | cut -f 1 -d ' ' | diff - %tnull.perms
+
--- !ELF
FileHeader:
Class: ELFCLASS64
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