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| author | Jan Stancek <jstancek@redhat.com> | 2012-10-01 10:16:29 +0200 |
|---|---|---|
| committer | Eric B Munson <emunson@mgebm.net> | 2012-11-06 08:17:51 -0500 |
| commit | 64dedcf4eac90c0b35438be9e2ad3bb34f584ed3 (patch) | |
| tree | 9246f7422f1acfae31333e603afb9f1ded7ee70f /tests | |
| parent | 03687a4235f9e1bb972dd13f16792e4adf2ebb17 (diff) | |
| download | libhugetlbfs-64dedcf4eac90c0b35438be9e2ad3bb34f584ed3.tar.gz | |
mremap can't extend shared anon memory
mremap-expand-slice-collision mmaps page of shared anon memory,
which is then passed to mremap to extend this mapping to two pages:
mremap(q, page_size, 2*page_size, 0);
The mapping is extended, but backing shmem file is not, so accessing
second page always fails with SIGBUS in do_readback().
Signed-off-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Eric B Munson <emunson@mgebm.net>
Diffstat (limited to 'tests')
| -rw-r--r-- | tests/mremap-expand-slice-collision.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tests/mremap-expand-slice-collision.c b/tests/mremap-expand-slice-collision.c index 0cbff15..7178c6a 100644 --- a/tests/mremap-expand-slice-collision.c +++ b/tests/mremap-expand-slice-collision.c @@ -114,7 +114,7 @@ int main(int argc, char *argv[]) q = mmap((void *)(SLICE_BOUNDARY - page_size), page_size, PROT_READ | PROT_WRITE, - MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0); + MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0); if (q == MAP_FAILED) FAIL("mmap(normal below): %s", strerror(errno)); |