The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 0aac13add26d546ac74c89d2883b3a5f0fbea039 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024010233-emblem-devalue-d485@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..
Possible dependencies:
0aac13add26d ("selftests: secretmem: floor the memory size to the multiple of page_size")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 0aac13add26d546ac74c89d2883b3a5f0fbea039 Mon Sep 17 00:00:00 2001 From: Muhammad Usama Anjum usama.anjum@collabora.com Date: Thu, 14 Dec 2023 15:19:30 +0500 Subject: [PATCH] selftests: secretmem: floor the memory size to the multiple of page_size
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: 76fe17ef588a ("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
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");