The patch titled
Subject: selftests: secretmem: floor the memory size to the multiple of page_size
has been added to the -mm mm-nonmm-unstable branch. Its filename is
selftests-secretmem-floor-the-memory-size-to-the-multiple-of-page_size.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-secretmem-floor-the-memory-size-to-the-multiple-of-page_size.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Muhammad Usama Anjum <usama.anjum@xxxxxxxxxxxxx>
Subject: selftests: secretmem: floor the memory size to the multiple of page_size
Date: Thu, 14 Dec 2023 15:19:30 +0500
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.
Link: https://lkml.kernel.org/r/20231214101931.1155586-1-usama.anjum@xxxxxxxxxxxxx
Fixes: 76fe17ef588a ("secretmem: test: add basic selftest for memfd_secret(2)")
Signed-off-by: Muhammad Usama Anjum <usama.anjum@xxxxxxxxxxxxx>
Reported-by: "kernelci.org bot" <bot@xxxxxxxxxxxx>
Cc: "James E.J. Bottomley" <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
Cc: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/mm/memfd_secret.c | 3 +++
1 file changed, 3 insertions(+)
--- a/tools/testing/selftests/mm/memfd_secret.c~selftests-secretmem-floor-the-memory-size-to-the-multiple-of-page_size
+++ a/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");
_
Patches currently in -mm which might be from usama.anjum@xxxxxxxxxxxxx are
selftests-secretmem-floor-the-memory-size-to-the-multiple-of-page_size.patch
