UPSTREAM: selftest mm/mseal: fix test_seal_mremap_move_dontunmap_anyaddr

the syscall remap accepts following:

mremap(src, size, size, MREMAP_MAYMOVE | MREMAP_DONTUNMAP, dst)

when the src is sealed, the call will fail with error code:
EPERM

Previously, the test uses hard-coded 0xdeaddead as dst, and it
will fail on the system with newer glibc installed.

This patch removes test's dependency on glibc for mremap(), also
fix the test and remove the hardcoded address.

Link: https://lkml.kernel.org/r/20240807212320.2831848-1-jeffxu@chromium.org


Fixes: 4926c7a5 ("selftest mm/mseal memory sealing")
Signed-off-by: Jeff Xu <jeffxu@chromium.org>
Reported-by: Pedro Falcato <pedro.falcato@gmail.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
(cherry picked from commit 072cd213)

BUG=b:344650370
TEST=precheckin

Signed-off-by: Linux Patches Robot <linux-patches-robot@chromeos-missing-patches.google.com.iam.gserviceaccount.com>
Change-Id: I50eb079b12d5b47c0cad88e3a97dcd14ff192127
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/5879988


Reviewed-by: Jeff Xu <jeffxu@google.com>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Commit-Queue: Jeff Xu <jeffxu@google.com>
Tested-by: Jeff Xu <jeffxu@google.com>
Reviewed-by: Sean Paul <sean@poorly.run>
Signed-off-by: Mateusz Urbańczyk <urbanczyk@google.com>