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Muhammad Usama Anjum 80eb449f80 selftests: secretmem: floor the memory size to the multiple of page_size 
[ Upstream commit 0aac13add2 ]

The "locked-in-memory size" limit per process can be non-multiple of
page_size.  The mmap() fails if we try to allocate locked-in-memory with
same size as the allowed limit if it isn't multiple of the page_size
because mmap() rounds off the memory size to be allocated to next multiple
of page_size.

Fix this by flooring the length to be allocated with mmap() to the
previous multiple of the page_size.

This was getting triggered on KernelCI regularly because of different
ulimit settings which wasn't multiple of the page_size.  Find logs
here: https://linux.kernelci.org/test/plan/id/657654bd8e81e654fae13532/
The bug in was present from the time test was first added.

Link: https://lkml.kernel.org/r/20231214101931.1155586-1-usama.anjum@collabora.com
Fixes: 76fe17ef58 ("secretmem: test: add basic selftest for memfd_secret(2)")
Signed-off-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Reported-by: "kernelci.org bot" <bot@kernelci.org>
Closes: https://linux.kernelci.org/test/plan/id/657654bd8e81e654fae13532/
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-01-15 18:51:21 +01:00
..
fault-injection docs: fault-injection: convert docs to ReST and rename to *.rst 2019-06-14 14:21:07 -06:00
ktest ktest.pl: Add RUN_TIMEOUT option with default unlimited 2023-03-10 09:40:10 +01:00
kunit kunit: tool: Import missing importlib.abc 2022-02-23 12:03:04 +01:00
nvdimm memremap: remove support for external pgmap refcounts 2022-08-17 14:23:43 +02:00
radix-tree radix tree test suite: fix incorrect allocation size for pthreads 2023-08-16 18:21:58 +02:00
scatterlist Merge branch 'akpm' (patches from Andrew) 2021-09-03 10:08:28 -07:00
selftests selftests: secretmem: floor the memory size to the multiple of page_size 2024-01-15 18:51:21 +01:00
vsock vsock_diag_test: remove free_sock_stat() call in test_no_sockets 2021-10-15 17:21:34 -07:00