tests/tcg/multiarch/test-mmap: Check mmaps beyond reserved_va
Unfixed mmap calls where start > reserved_va or the max guest addr should have a valid result. Signed-off-by: Bingwu Zhang <xtex@astrafall.org> Signed-off-by: Helge Deller <deller@gmx.de>
Bingwu Zhang committed
Feb 28, 2026 at 00:46 UTC
c865b6bce5d0c882b86fb7c3512174cdaf235017
1 file changed
+15
tests/tcg/multiarch/test-mmap.c
+15
@@ -497,6 +497,20 @@ void check_shrink_mmaps(void)
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fprintf(stdout, " passed\n");
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}
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+void check_mmaps_beyond_addr_space(void)
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+{
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+ unsigned char *addr;
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+ addr = mmap((void *)(-(unsigned long)pagesize * 10), pagesize * 2,
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+ PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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+ fprintf(stdout, "%s addr=%p errno=%d", __func__, (void *)addr, errno);
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+ fail_unless(addr != MAP_FAILED);
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+
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+ memcpy(dummybuf, addr, 2 * pagesize);
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+ munmap(addr, 2 * pagesize);
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+
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+ fprintf(stdout, " passed\n");
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+}
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+
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int main(int argc, char **argv)
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{
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char tempname[] = "/tmp/.cmmapXXXXXX";
@@ -540,6 +554,7 @@ int main(int argc, char **argv)
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check_file_unfixed_eof_mmaps();
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check_invalid_mmaps();
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check_shrink_mmaps();
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+ check_mmaps_beyond_addr_space();
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/* Fails at the moment. */
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/* check_aligned_anonymous_fixed_mmaps_collide_with_host(); */