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selftests: secretmem: floor the memory size to the multiple of page_size
commit0aac13add2
upstream. 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -62,6 +62,9 @@ static void test_mlock_limit(int fd)
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char *mem;
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len = mlock_limit_cur;
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if (len % page_size != 0)
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len = (len/page_size) * page_size;
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mem = mmap(NULL, len, prot, mode, fd, 0);
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if (mem == MAP_FAILED) {
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fail("unable to mmap secret memory\n");
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