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Hongfu Li
8f1d96a16c
The test creates a non-anonymous VMA (ptr_not_anon) via mmap() with MAP_PRIVATE but without MAP_ANONYMOUS, using fd=0 (stdin) as the file descriptor. This always fails because fd=0 is not a regular file, and the failure was hidden because ASSERT_NE() incorrectly checked for NULL instead of MAP_FAILED. Fix by using mkstemp() + ftruncate() to create a real temporary file, then mapping it with MAP_PRIVATE to obtain a genuine file-backed VMA. Also fix the mmap() error checks to use MAP_FAILED instead of NULL, and pass fd=-1 for the anonymous mapping for clarity. The temp file is unlinked immediately so it does not persist on disk. Link: https://lore.kernel.org/[email protected] Signed-off-by: Hongfu Li <[email protected]> Cc: Shuah Khan <[email protected]> Cc: Wei Yang <[email protected]> Signed-off-by: Andrew Morton <[email protected]>