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Thu, 14 Dec 2023 10:19:49 +0000 (UTC) From: Muhammad Usama Anjum To: Andrew Morton , Shuah Khan , Mike Rapoport , James Bottomley Cc: Muhammad Usama Anjum , kernel@collabora.com, "kernelci.org bot" , linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] selftests: secretmem: Floor the memory size to the multiple of page_size Date: Thu, 14 Dec 2023 15:19:30 +0500 Message-ID: <20231214101931.1155586-1-usama.anjum@collabora.com> X-Mailer: git-send-email 2.42.0 MIME-Version: 1.0 X-Rspamd-Queue-Id: E1463A001D X-Rspam-User: X-Stat-Signature: ab9jgkpie5omypf1sjxtbsswfy4giqnq X-Rspamd-Server: rspam01 X-HE-Tag: 1702549195-143433 X-HE-Meta: U2FsdGVkX19gbWwptRSIxz3d5nM9YrVq+5YD/++HNyjDpcnL9LLtikYcwsg8TAAqQA24e7C3xRK9fj4u7cVr743L6G0Ao68tGWugqMKH6bio81GxBuXb9Pzwe7WTIEf5R1qDxpGHEo9w15dKbNWUbEZPmh/+kMMi5HQyVIfSWrZiwxoBWI16+Qv2MLReHNbW6QjrUY1xXvK8HZIjHKL0ib6f0EE3+P+dC1s7TIwmEWl9lXZPieG4rGG21gXyyxw0NXbJRvT8V2i4DAsPHE64M6BAAyIvrAeVIQdz+ob0G2LkSe5htdzwurBY9C+ytN6UO2xJE6+r4SSu/Khtv34yegq0mxhBIs/SEvG0BWMUhUpn0BV4d60FRZbMDi/hULUX4fWZALw96ztczYUGw5S3FhmAhcgiyBMl69GfnYXsbsO7bLqVUw2hLFPbQhWeuzGaxcstz8d71mS+G+lLU/n4SKjVHH/JYp5wz9l8zbs/WavykRsyZUs5VoZXFGSvXhAV5BqndqTWDzw4Fuz5hb69b5iTBMK3ueHgaBJri6C+f7MQeAzPx0YGSbHKnMFdfKBnFR/euWpXjZgTUSctphVOghqj7l84ONKB4mMcx3gekRQ7p7yt5z4yy/5NQIzhkDRfjDqRURBtbuVXkJ0fgUKXWJuXnpvFXFY8jkd7GBeTpLI8m98XRtsXr0c1nvdxbzKVzd4bACa01yM2/HX2eXa6rIMdzzh0dp4Jk4S7XDPJZCUUFhgSUYfHYEmt1hsUldJ0ahIS9apGcoqBkJha+j7WWNdEOxv0HfPEBz7ZmbOaJaH1qM4fbiGSX76C9IhdNw58PcXtDI4vEYZCWMqz4zWn7g6YBhZLMMYgt0VBMHl+FwFRlh74xOPNUFPTQZCXYwpC93fJzA6jAVIkqWjMl1XiQh2QoR5lyoxDVt0lLVRRASBPNv9QbgQZOUFY/5mvmfO9FlXJNK2IXZ3TSrDxLHo jW7KJJJC 2TBlshNHL9guReO8mtkwAwHjx/J39jzY8K5p4qKWLuVbu93S9eCO+coI1RTQwGTn9TnUpjO5jhjzXF2GKx9kGLvDC/FKMY5uYrvzQw9PHAcAriRlb2+Oly1GINf/w0ApXMCbC9jYcw2ZgfrmjxT8QdUA5MiorGeeY6OAQqnin/xo4eAuZlDnKDVbrs0FtMclPTj0UhLCBHgZkYREPJG0SpttRE4QGsTnxYoYeumijcvfsxRIJV5BzW/FzKqoDYgyhbaVGujkTjHLTf3NGLeNTM+lz57X2a9nquHoG9bGuduAU7JzWX/zY8Pbv3x9K49j55i+Lxzno/v7XwWg8YK46HXxXAlzsrzswVcX24hHPvW5dIPk= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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. Fixes: 76fe17ef588a ("secretmem: test: add basic selftest for memfd_secret(2)") Reported-by: "kernelci.org bot" Signed-off-by: Muhammad Usama Anjum Reported-by:. --- tools/testing/selftests/mm/memfd_secret.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/tools/testing/selftests/mm/memfd_secret.c b/tools/testing/selftests/mm/memfd_secret.c index 957b9e18c729..9b298f6a04b3 100644 --- a/tools/testing/selftests/mm/memfd_secret.c +++ b/tools/testing/selftests/mm/memfd_secret.c @@ -62,6 +62,9 @@ static void test_mlock_limit(int fd) char *mem; len = mlock_limit_cur; + if (len % page_size != 0) + len = (len/page_size) * page_size; + mem = mmap(NULL, len, prot, mode, fd, 0); if (mem == MAP_FAILED) { fail("unable to mmap secret memory\n");