28 lines
763 B
C
28 lines
763 B
C
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/* Tries to map a zero-length file, which may or may not work but
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should not terminate the process or crash.
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Then dereferences the address that we tried to map,
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and the process must be terminated with -1 exit code. */
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#include <syscall.h>
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#include "tests/lib.h"
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#include "tests/main.h"
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void
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test_main (void)
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{
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char *data = (char *) 0x7f000000;
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int handle;
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CHECK (create ("empty", 0), "create empty file \"empty\"");
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CHECK ((handle = open ("empty")) > 1, "open \"empty\"");
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/* Calling mmap() might succeed or fail. We don't care. */
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msg ("mmap \"empty\"");
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mmap (handle, data);
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/* Regardless of whether the call worked, *data should cause
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the process to be terminated. */
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fail ("unmapped memory is readable (%d)", *data);
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}
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